diff --git a/apps/server/integration/orchestrationEngine.integration.test.ts b/apps/server/integration/orchestrationEngine.integration.test.ts
index d6b1004749..7360df8511 100644
--- a/apps/server/integration/orchestrationEngine.integration.test.ts
+++ b/apps/server/integration/orchestrationEngine.integration.test.ts
@@ -116,6 +116,7 @@ const seedProjectAndThread = (harness: OrchestrationIntegrationHarness) =>
       projectId: PROJECT_ID,
       title: "Integration Project",
       workspaceRoot: harness.workspaceDir,
+      pinned: false,
       defaultModelSelection: {
         provider,
         model: defaultModel,
@@ -129,6 +130,7 @@ const seedProjectAndThread = (harness: OrchestrationIntegrationHarness) =>
       threadId: THREAD_ID,
       projectId: PROJECT_ID,
       title: "Integration Thread",
+      pinned: false,
       modelSelection: {
         provider,
         model: defaultModel,
@@ -265,6 +267,7 @@ it.live.skipIf(!process.env.CODEX_BINARY_PATH)(
           projectId: PROJECT_ID,
           title: "Integration Project",
           workspaceRoot: harness.workspaceDir,
+          pinned: false,
           defaultModelSelection: {
             provider: "codex",
             model: "gpt-5.3-codex",
@@ -278,6 +281,7 @@ it.live.skipIf(!process.env.CODEX_BINARY_PATH)(
           threadId: THREAD_ID,
           projectId: PROJECT_ID,
           title: "Integration Thread",
+          pinned: false,
           modelSelection: {
             provider: "codex",
             model: "gpt-5.3-codex",
diff --git a/apps/server/src/checkpointing/Layers/CheckpointDiffQuery.test.ts b/apps/server/src/checkpointing/Layers/CheckpointDiffQuery.test.ts
index 9fb2500ce4..1f8b4793c1 100644
--- a/apps/server/src/checkpointing/Layers/CheckpointDiffQuery.test.ts
+++ b/apps/server/src/checkpointing/Layers/CheckpointDiffQuery.test.ts
@@ -31,6 +31,7 @@ function makeSnapshot(input: {
         id: input.projectId,
         title: "Project",
         workspaceRoot: input.workspaceRoot,
+        pinnedAt: null,
         defaultModelSelection: null,
         scripts: [],
         createdAt: "2026-01-01T00:00:00.000Z",
@@ -43,6 +44,7 @@ function makeSnapshot(input: {
         id: input.threadId,
         projectId: input.projectId,
         title: "Thread",
+        pinnedAt: null,
         modelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
diff --git a/apps/server/src/orchestration/Layers/CheckpointReactor.test.ts b/apps/server/src/orchestration/Layers/CheckpointReactor.test.ts
index 075f62f889..2e18356ad9 100644
--- a/apps/server/src/orchestration/Layers/CheckpointReactor.test.ts
+++ b/apps/server/src/orchestration/Layers/CheckpointReactor.test.ts
@@ -282,6 +282,7 @@ describe("CheckpointReactor", () => {
         projectId: asProjectId("project-1"),
         title: "Test Project",
         workspaceRoot: options?.projectWorkspaceRoot ?? cwd,
+        pinned: false,
         defaultModelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
@@ -296,6 +297,7 @@ describe("CheckpointReactor", () => {
         threadId: ThreadId.makeUnsafe("thread-1"),
         projectId: asProjectId("project-1"),
         title: "Thread",
+        pinned: false,
         modelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
diff --git a/apps/server/src/orchestration/Layers/OrchestrationEngine.test.ts b/apps/server/src/orchestration/Layers/OrchestrationEngine.test.ts
index 6aa889991e..6df6e2481b 100644
--- a/apps/server/src/orchestration/Layers/OrchestrationEngine.test.ts
+++ b/apps/server/src/orchestration/Layers/OrchestrationEngine.test.ts
@@ -72,6 +72,7 @@ describe("OrchestrationEngine", () => {
         projectId: asProjectId("project-1"),
         title: "Project 1",
         workspaceRoot: "/tmp/project-1",
+        pinned: false,
         defaultModelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
@@ -86,6 +87,7 @@ describe("OrchestrationEngine", () => {
         threadId: ThreadId.makeUnsafe("thread-1"),
         projectId: asProjectId("project-1"),
         title: "Thread",
+        pinned: false,
         modelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
@@ -132,6 +134,7 @@ describe("OrchestrationEngine", () => {
         projectId: asProjectId("project-archive"),
         title: "Project Archive",
         workspaceRoot: "/tmp/project-archive",
+        pinned: false,
         defaultModelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
@@ -146,6 +149,7 @@ describe("OrchestrationEngine", () => {
         threadId: ThreadId.makeUnsafe("thread-archive"),
         projectId: asProjectId("project-archive"),
         title: "Archive me",
+        pinned: false,
         modelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
@@ -199,6 +203,7 @@ describe("OrchestrationEngine", () => {
         projectId: asProjectId("project-replay"),
         title: "Replay Project",
         workspaceRoot: "/tmp/project-replay",
+        pinned: false,
         defaultModelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
@@ -213,6 +218,7 @@ describe("OrchestrationEngine", () => {
         threadId: ThreadId.makeUnsafe("thread-replay"),
         projectId: asProjectId("project-replay"),
         title: "replay",
+        pinned: false,
         modelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
@@ -257,6 +263,7 @@ describe("OrchestrationEngine", () => {
         projectId: asProjectId("project-stream"),
         title: "Stream Project",
         workspaceRoot: "/tmp/project-stream",
+        pinned: false,
         defaultModelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
@@ -281,6 +288,7 @@ describe("OrchestrationEngine", () => {
           threadId: ThreadId.makeUnsafe("thread-stream"),
           projectId: asProjectId("project-stream"),
           title: "domain-stream",
+          pinned: false,
           modelSelection: {
             provider: "codex",
             model: "gpt-5-codex",
@@ -318,6 +326,7 @@ describe("OrchestrationEngine", () => {
         projectId: asProjectId("project-turn-diff"),
         title: "Turn Diff Project",
         workspaceRoot: "/tmp/project-turn-diff",
+        pinned: false,
         defaultModelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
@@ -332,6 +341,7 @@ describe("OrchestrationEngine", () => {
         threadId: ThreadId.makeUnsafe("thread-turn-diff"),
         projectId: asProjectId("project-turn-diff"),
         title: "Turn diff thread",
+        pinned: false,
         modelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
@@ -435,6 +445,7 @@ describe("OrchestrationEngine", () => {
         projectId: asProjectId("project-flaky"),
         title: "Flaky Project",
         workspaceRoot: "/tmp/project-flaky",
+        pinned: false,
         defaultModelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
@@ -451,6 +462,7 @@ describe("OrchestrationEngine", () => {
           threadId: ThreadId.makeUnsafe("thread-flaky-fail"),
           projectId: asProjectId("project-flaky"),
           title: "flaky-fail",
+          pinned: false,
           modelSelection: {
             provider: "codex",
             model: "gpt-5-codex",
@@ -471,6 +483,7 @@ describe("OrchestrationEngine", () => {
         threadId: ThreadId.makeUnsafe("thread-flaky-ok"),
         projectId: asProjectId("project-flaky"),
         title: "flaky-ok",
+        pinned: false,
         modelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
@@ -528,6 +541,7 @@ describe("OrchestrationEngine", () => {
         projectId: asProjectId("project-atomic"),
         title: "Atomic Project",
         workspaceRoot: "/tmp/project-atomic",
+        pinned: false,
         defaultModelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
@@ -542,6 +556,7 @@ describe("OrchestrationEngine", () => {
         threadId: ThreadId.makeUnsafe("thread-atomic"),
         projectId: asProjectId("project-atomic"),
         title: "atomic",
+        pinned: false,
         modelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
@@ -669,6 +684,7 @@ describe("OrchestrationEngine", () => {
         projectId: asProjectId("project-sync"),
         title: "Sync Project",
         workspaceRoot: "/tmp/project-sync",
+        pinned: false,
         defaultModelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
@@ -683,6 +699,7 @@ describe("OrchestrationEngine", () => {
         threadId: ThreadId.makeUnsafe("thread-sync"),
         projectId: asProjectId("project-sync"),
         title: "sync-before",
+        pinned: false,
         modelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
@@ -754,6 +771,7 @@ describe("OrchestrationEngine", () => {
         projectId: asProjectId("project-duplicate"),
         title: "Duplicate Project",
         workspaceRoot: "/tmp/project-duplicate",
+        pinned: false,
         defaultModelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
@@ -769,6 +787,7 @@ describe("OrchestrationEngine", () => {
         threadId: ThreadId.makeUnsafe("thread-duplicate"),
         projectId: asProjectId("project-duplicate"),
         title: "duplicate",
+        pinned: false,
         modelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
@@ -789,6 +808,7 @@ describe("OrchestrationEngine", () => {
           threadId: ThreadId.makeUnsafe("thread-duplicate"),
           projectId: asProjectId("project-duplicate"),
           title: "duplicate",
+          pinned: false,
           modelSelection: {
             provider: "codex",
             model: "gpt-5-codex",
diff --git a/apps/server/src/orchestration/Layers/ProjectionPipeline.test.ts b/apps/server/src/orchestration/Layers/ProjectionPipeline.test.ts
index 77b5d4d619..f59d7f1c94 100644
--- a/apps/server/src/orchestration/Layers/ProjectionPipeline.test.ts
+++ b/apps/server/src/orchestration/Layers/ProjectionPipeline.test.ts
@@ -1867,6 +1867,7 @@ engineLayer("OrchestrationProjectionPipeline via engine dispatch", (it) => {
         projectId: ProjectId.makeUnsafe("project-live"),
         title: "Live Project",
         workspaceRoot: "/tmp/project-live",
+        pinned: false,
         defaultModelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
@@ -1905,6 +1906,7 @@ engineLayer("OrchestrationProjectionPipeline via engine dispatch", (it) => {
         projectId: ProjectId.makeUnsafe("project-scripts"),
         title: "Scripts Project",
         workspaceRoot: "/tmp/project-scripts",
+        pinned: false,
         defaultModelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
diff --git a/apps/server/src/orchestration/Layers/ProjectionPipeline.ts b/apps/server/src/orchestration/Layers/ProjectionPipeline.ts
index f0f2ccabee..5eb050269b 100644
--- a/apps/server/src/orchestration/Layers/ProjectionPipeline.ts
+++ b/apps/server/src/orchestration/Layers/ProjectionPipeline.ts
@@ -383,6 +383,7 @@ const makeOrchestrationProjectionPipeline = Effect.fn("makeOrchestrationProjecti
             projectId: event.payload.projectId,
             title: event.payload.title,
             workspaceRoot: event.payload.workspaceRoot,
+            pinnedAt: event.payload.pinnedAt,
             defaultModelSelection: event.payload.defaultModelSelection,
             scripts: event.payload.scripts,
             createdAt: event.payload.createdAt,
@@ -404,6 +405,7 @@ const makeOrchestrationProjectionPipeline = Effect.fn("makeOrchestrationProjecti
             ...(event.payload.workspaceRoot !== undefined
               ? { workspaceRoot: event.payload.workspaceRoot }
               : {}),
+            ...(event.payload.pinnedAt !== undefined ? { pinnedAt: event.payload.pinnedAt } : {}),
             ...(event.payload.defaultModelSelection !== undefined
               ? { defaultModelSelection: event.payload.defaultModelSelection }
               : {}),
@@ -442,6 +444,7 @@ const makeOrchestrationProjectionPipeline = Effect.fn("makeOrchestrationProjecti
             threadId: event.payload.threadId,
             projectId: event.payload.projectId,
             title: event.payload.title,
+            pinnedAt: event.payload.pinnedAt,
             modelSelection: event.payload.modelSelection,
             runtimeMode: event.payload.runtimeMode,
             interactionMode: event.payload.interactionMode,
@@ -495,6 +498,7 @@ const makeOrchestrationProjectionPipeline = Effect.fn("makeOrchestrationProjecti
           yield* projectionThreadRepository.upsert({
             ...existingRow.value,
             ...(event.payload.title !== undefined ? { title: event.payload.title } : {}),
+            ...(event.payload.pinnedAt !== undefined ? { pinnedAt: event.payload.pinnedAt } : {}),
             ...(event.payload.modelSelection !== undefined
               ? { modelSelection: event.payload.modelSelection }
               : {}),
diff --git a/apps/server/src/orchestration/Layers/ProjectionSnapshotQuery.test.ts b/apps/server/src/orchestration/Layers/ProjectionSnapshotQuery.test.ts
index 32143d751f..9ec55d56cd 100644
--- a/apps/server/src/orchestration/Layers/ProjectionSnapshotQuery.test.ts
+++ b/apps/server/src/orchestration/Layers/ProjectionSnapshotQuery.test.ts
@@ -234,6 +234,7 @@ projectionSnapshotLayer("ProjectionSnapshotQuery", (it) => {
           id: asProjectId("project-1"),
           title: "Project 1",
           workspaceRoot: "/tmp/project-1",
+          pinnedAt: null,
           defaultModelSelection: {
             provider: "codex",
             model: "gpt-5-codex",
@@ -257,6 +258,7 @@ projectionSnapshotLayer("ProjectionSnapshotQuery", (it) => {
           id: ThreadId.makeUnsafe("thread-1"),
           projectId: asProjectId("project-1"),
           title: "Thread 1",
+          pinnedAt: null,
           modelSelection: {
             provider: "codex",
             model: "gpt-5-codex",
diff --git a/apps/server/src/orchestration/Layers/ProjectionSnapshotQuery.ts b/apps/server/src/orchestration/Layers/ProjectionSnapshotQuery.ts
index f951c54b5b..f24ae6ff40 100644
--- a/apps/server/src/orchestration/Layers/ProjectionSnapshotQuery.ts
+++ b/apps/server/src/orchestration/Layers/ProjectionSnapshotQuery.ts
@@ -46,6 +46,7 @@ import {
 const decodeReadModel = Schema.decodeUnknownEffect(OrchestrationReadModel);
 const ProjectionProjectDbRowSchema = ProjectionProject.mapFields(
   Struct.assign({
+    pinnedAt: Schema.NullOr(IsoDateTime),
     defaultModelSelection: Schema.NullOr(Schema.fromJsonString(ModelSelection)),
     scripts: Schema.fromJsonString(Schema.Array(ProjectScript)),
   }),
@@ -59,6 +60,7 @@ const ProjectionThreadMessageDbRowSchema = ProjectionThreadMessage.mapFields(
 const ProjectionThreadProposedPlanDbRowSchema = ProjectionThreadProposedPlan;
 const ProjectionThreadDbRowSchema = ProjectionThread.mapFields(
   Struct.assign({
+    pinnedAt: Schema.NullOr(IsoDateTime),
     modelSelection: Schema.fromJsonString(ModelSelection),
   }),
 );
@@ -147,6 +149,7 @@ const makeProjectionSnapshotQuery = Effect.gen(function* () {
           project_id AS "projectId",
           title,
           workspace_root AS "workspaceRoot",
+          pinned_at AS "pinnedAt",
           default_model_selection_json AS "defaultModelSelection",
           scripts_json AS "scripts",
           created_at AS "createdAt",
@@ -166,6 +169,7 @@ const makeProjectionSnapshotQuery = Effect.gen(function* () {
           thread_id AS "threadId",
           project_id AS "projectId",
           title,
+          pinned_at AS "pinnedAt",
           model_selection_json AS "modelSelection",
           runtime_mode AS "runtimeMode",
           interaction_mode AS "interactionMode",
@@ -542,6 +546,7 @@ const makeProjectionSnapshotQuery = Effect.gen(function* () {
             id: row.projectId,
             title: row.title,
             workspaceRoot: row.workspaceRoot,
+            pinnedAt: row.pinnedAt,
             defaultModelSelection: row.defaultModelSelection,
             scripts: row.scripts,
             createdAt: row.createdAt,
@@ -553,6 +558,7 @@ const makeProjectionSnapshotQuery = Effect.gen(function* () {
             id: row.threadId,
             projectId: row.projectId,
             title: row.title,
+            pinnedAt: row.pinnedAt,
             modelSelection: row.modelSelection,
             runtimeMode: row.runtimeMode,
             interactionMode: row.interactionMode,
diff --git a/apps/server/src/orchestration/Layers/ProviderCommandReactor.test.ts b/apps/server/src/orchestration/Layers/ProviderCommandReactor.test.ts
index ed7037695f..0d7e1f7123 100644
--- a/apps/server/src/orchestration/Layers/ProviderCommandReactor.test.ts
+++ b/apps/server/src/orchestration/Layers/ProviderCommandReactor.test.ts
@@ -245,6 +245,7 @@ describe("ProviderCommandReactor", () => {
         projectId: asProjectId("project-1"),
         title: "Provider Project",
         workspaceRoot: "/tmp/provider-project",
+        pinned: false,
         defaultModelSelection: modelSelection,
         createdAt: now,
       }),
@@ -256,6 +257,7 @@ describe("ProviderCommandReactor", () => {
         threadId: ThreadId.makeUnsafe("thread-1"),
         projectId: asProjectId("project-1"),
         title: "Thread",
+        pinned: false,
         modelSelection: modelSelection,
         interactionMode: DEFAULT_PROVIDER_INTERACTION_MODE,
         runtimeMode: "approval-required",
diff --git a/apps/server/src/orchestration/Layers/ProviderRuntimeIngestion.test.ts b/apps/server/src/orchestration/Layers/ProviderRuntimeIngestion.test.ts
index 529eae2444..5f8e134e7a 100644
--- a/apps/server/src/orchestration/Layers/ProviderRuntimeIngestion.test.ts
+++ b/apps/server/src/orchestration/Layers/ProviderRuntimeIngestion.test.ts
@@ -225,6 +225,7 @@ describe("ProviderRuntimeIngestion", () => {
         projectId: asProjectId("project-1"),
         title: "Provider Project",
         workspaceRoot,
+        pinned: false,
         defaultModelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
@@ -239,6 +240,7 @@ describe("ProviderRuntimeIngestion", () => {
         threadId: ThreadId.makeUnsafe("thread-1"),
         projectId: asProjectId("project-1"),
         title: "Thread",
+        pinned: false,
         modelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
@@ -768,6 +770,7 @@ describe("ProviderRuntimeIngestion", () => {
         threadId: sourceThreadId,
         projectId: asProjectId("project-1"),
         title: "Plan Source",
+        pinned: false,
         modelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
@@ -803,6 +806,7 @@ describe("ProviderRuntimeIngestion", () => {
         threadId: targetThreadId,
         projectId: asProjectId("project-1"),
         title: "Plan Target",
+        pinned: false,
         modelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
@@ -955,6 +959,7 @@ describe("ProviderRuntimeIngestion", () => {
         threadId: sourceThreadId,
         projectId: asProjectId("project-1"),
         title: "Plan Source",
+        pinned: false,
         modelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
@@ -1108,6 +1113,7 @@ describe("ProviderRuntimeIngestion", () => {
         threadId: sourceThreadId,
         projectId: asProjectId("project-1"),
         title: "Plan Source",
+        pinned: false,
         modelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
@@ -1143,6 +1149,7 @@ describe("ProviderRuntimeIngestion", () => {
         threadId: targetThreadId,
         projectId: asProjectId("project-1"),
         title: "Plan Target",
+        pinned: false,
         modelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
diff --git a/apps/server/src/orchestration/commandInvariants.test.ts b/apps/server/src/orchestration/commandInvariants.test.ts
index 43d665a2c9..376e3f1480 100644
--- a/apps/server/src/orchestration/commandInvariants.test.ts
+++ b/apps/server/src/orchestration/commandInvariants.test.ts
@@ -28,6 +28,7 @@ const readModel: OrchestrationReadModel = {
       id: ProjectId.makeUnsafe("project-a"),
       title: "Project A",
       workspaceRoot: "/tmp/project-a",
+      pinnedAt: null,
       defaultModelSelection: {
         provider: "codex",
         model: "gpt-5-codex",
@@ -41,6 +42,7 @@ const readModel: OrchestrationReadModel = {
       id: ProjectId.makeUnsafe("project-b"),
       title: "Project B",
       workspaceRoot: "/tmp/project-b",
+      pinnedAt: null,
       defaultModelSelection: {
         provider: "codex",
         model: "gpt-5-codex",
@@ -56,6 +58,7 @@ const readModel: OrchestrationReadModel = {
       id: ThreadId.makeUnsafe("thread-1"),
       projectId: ProjectId.makeUnsafe("project-a"),
       title: "Thread A",
+      pinnedAt: null,
       modelSelection: {
         provider: "codex",
         model: "gpt-5-codex",
@@ -79,6 +82,7 @@ const readModel: OrchestrationReadModel = {
       id: ThreadId.makeUnsafe("thread-2"),
       projectId: ProjectId.makeUnsafe("project-b"),
       title: "Thread B",
+      pinnedAt: null,
       modelSelection: {
         provider: "codex",
         model: "gpt-5-codex",
@@ -158,6 +162,7 @@ describe("commandInvariants", () => {
           threadId: ThreadId.makeUnsafe("thread-3"),
           projectId: ProjectId.makeUnsafe("project-a"),
           title: "new",
+          pinned: false,
           modelSelection: {
             provider: "codex",
             model: "gpt-5-codex",
@@ -182,6 +187,7 @@ describe("commandInvariants", () => {
             threadId: ThreadId.makeUnsafe("thread-1"),
             projectId: ProjectId.makeUnsafe("project-a"),
             title: "dup",
+            pinned: false,
             modelSelection: {
               provider: "codex",
               model: "gpt-5-codex",
diff --git a/apps/server/src/orchestration/decider.projectScripts.test.ts b/apps/server/src/orchestration/decider.projectScripts.test.ts
index 465865549b..f25a3f2f94 100644
--- a/apps/server/src/orchestration/decider.projectScripts.test.ts
+++ b/apps/server/src/orchestration/decider.projectScripts.test.ts
@@ -29,6 +29,7 @@ describe("decider project scripts", () => {
           projectId: asProjectId("project-scripts"),
           title: "Scripts",
           workspaceRoot: "/tmp/scripts",
+          pinned: false,
           createdAt: now,
         },
         readModel,
@@ -37,7 +38,10 @@ describe("decider project scripts", () => {
 
     const event = Array.isArray(result) ? result[0] : result;
     expect(event.type).toBe("project.created");
-    expect((event.payload as { scripts: unknown[] }).scripts).toEqual([]);
+    expect(event.payload).toMatchObject({
+      pinnedAt: null,
+      scripts: [],
+    });
   });
 
   it("propagates scripts in project.meta.update payload", async () => {
@@ -59,6 +63,7 @@ describe("decider project scripts", () => {
           projectId: asProjectId("project-scripts"),
           title: "Scripts",
           workspaceRoot: "/tmp/scripts",
+          pinnedAt: null,
           defaultModelSelection: null,
           scripts: [],
           createdAt: now,
@@ -94,6 +99,82 @@ describe("decider project scripts", () => {
     expect((event.payload as { scripts?: unknown[] }).scripts).toEqual(scripts);
   });
 
+  it("propagates pin state through thread create and meta update", async () => {
+    const now = new Date().toISOString();
+    const initial = createEmptyReadModel(now);
+    const withProject = await Effect.runPromise(
+      projectEvent(initial, {
+        sequence: 1,
+        eventId: asEventId("evt-project-create-pin"),
+        aggregateKind: "project",
+        aggregateId: asProjectId("project-pin"),
+        type: "project.created",
+        occurredAt: now,
+        commandId: CommandId.makeUnsafe("cmd-project-create-pin"),
+        causationEventId: null,
+        correlationId: CommandId.makeUnsafe("cmd-project-create-pin"),
+        metadata: {},
+        payload: {
+          projectId: asProjectId("project-pin"),
+          title: "Project",
+          workspaceRoot: "/tmp/project-pin",
+          pinnedAt: null,
+          defaultModelSelection: null,
+          scripts: [],
+          createdAt: now,
+          updatedAt: now,
+        },
+      }),
+    );
+
+    const created = await Effect.runPromise(
+      decideOrchestrationCommand({
+        command: {
+          type: "thread.create",
+          commandId: CommandId.makeUnsafe("cmd-thread-create-pin"),
+          threadId: ThreadId.makeUnsafe("thread-pin"),
+          projectId: asProjectId("project-pin"),
+          title: "Pinned thread",
+          pinned: true,
+          modelSelection: {
+            provider: "codex",
+            model: "gpt-5-codex",
+          },
+          runtimeMode: "full-access",
+          interactionMode: DEFAULT_PROVIDER_INTERACTION_MODE,
+          branch: null,
+          worktreePath: null,
+          createdAt: now,
+        },
+        readModel: withProject,
+      }),
+    );
+    const createdEvent = Array.isArray(created) ? created[0] : created;
+    expect(createdEvent.type).toBe("thread.created");
+    expect(createdEvent.payload).toMatchObject({ pinnedAt: now });
+
+    const withThread = await Effect.runPromise(
+      projectEvent(withProject, {
+        ...createdEvent,
+        sequence: 2,
+      }),
+    );
+    const updated = await Effect.runPromise(
+      decideOrchestrationCommand({
+        command: {
+          type: "thread.meta.update",
+          commandId: CommandId.makeUnsafe("cmd-thread-update-pin"),
+          threadId: ThreadId.makeUnsafe("thread-pin"),
+          pinned: false,
+        },
+        readModel: withThread,
+      }),
+    );
+    const updatedEvent = Array.isArray(updated) ? updated[0] : updated;
+    expect(updatedEvent.type).toBe("thread.meta-updated");
+    expect(updatedEvent.payload).toMatchObject({ pinnedAt: null });
+  });
+
   it("emits user message and turn-start-requested events for thread.turn.start", async () => {
     const now = new Date().toISOString();
     const initial = createEmptyReadModel(now);
@@ -113,6 +194,7 @@ describe("decider project scripts", () => {
           projectId: asProjectId("project-1"),
           title: "Project",
           workspaceRoot: "/tmp/project",
+          pinnedAt: null,
           defaultModelSelection: null,
           scripts: [],
           createdAt: now,
@@ -136,6 +218,7 @@ describe("decider project scripts", () => {
           threadId: ThreadId.makeUnsafe("thread-1"),
           projectId: asProjectId("project-1"),
           title: "Thread",
+          pinnedAt: null,
           modelSelection: {
             provider: "codex",
             model: "gpt-5-codex",
@@ -222,6 +305,7 @@ describe("decider project scripts", () => {
           projectId: asProjectId("project-1"),
           title: "Project",
           workspaceRoot: "/tmp/project",
+          pinnedAt: null,
           defaultModelSelection: null,
           scripts: [],
           createdAt: now,
@@ -245,6 +329,7 @@ describe("decider project scripts", () => {
           threadId: ThreadId.makeUnsafe("thread-1"),
           projectId: asProjectId("project-1"),
           title: "Thread",
+          pinnedAt: null,
           modelSelection: {
             provider: "codex",
             model: "gpt-5-codex",
@@ -304,6 +389,7 @@ describe("decider project scripts", () => {
           projectId: asProjectId("project-1"),
           title: "Project",
           workspaceRoot: "/tmp/project",
+          pinnedAt: null,
           defaultModelSelection: null,
           scripts: [],
           createdAt: now,
@@ -327,6 +413,7 @@ describe("decider project scripts", () => {
           threadId: ThreadId.makeUnsafe("thread-1"),
           projectId: asProjectId("project-1"),
           title: "Thread",
+          pinnedAt: null,
           modelSelection: {
             provider: "codex",
             model: "gpt-5-codex",
diff --git a/apps/server/src/orchestration/decider.ts b/apps/server/src/orchestration/decider.ts
index 22f5bcb280..9a7dff04ca 100644
--- a/apps/server/src/orchestration/decider.ts
+++ b/apps/server/src/orchestration/decider.ts
@@ -77,6 +77,7 @@ export const decideOrchestrationCommand = Effect.fn("decideOrchestrationCommand"
           projectId: command.projectId,
           title: command.title,
           workspaceRoot: command.workspaceRoot,
+          pinnedAt: command.pinned ? command.createdAt : null,
           defaultModelSelection: command.defaultModelSelection ?? null,
           scripts: [],
           createdAt: command.createdAt,
@@ -104,6 +105,7 @@ export const decideOrchestrationCommand = Effect.fn("decideOrchestrationCommand"
           projectId: command.projectId,
           ...(command.title !== undefined ? { title: command.title } : {}),
           ...(command.workspaceRoot !== undefined ? { workspaceRoot: command.workspaceRoot } : {}),
+          ...(command.pinned !== undefined ? { pinnedAt: command.pinned ? occurredAt : null } : {}),
           ...(command.defaultModelSelection !== undefined
             ? { defaultModelSelection: command.defaultModelSelection }
             : {}),
@@ -158,6 +160,7 @@ export const decideOrchestrationCommand = Effect.fn("decideOrchestrationCommand"
           threadId: command.threadId,
           projectId: command.projectId,
           title: command.title,
+          pinnedAt: command.pinned ? command.createdAt : null,
           modelSelection: command.modelSelection,
           runtimeMode: command.runtimeMode,
           interactionMode: command.interactionMode,
@@ -254,6 +257,7 @@ export const decideOrchestrationCommand = Effect.fn("decideOrchestrationCommand"
         payload: {
           threadId: command.threadId,
           ...(command.title !== undefined ? { title: command.title } : {}),
+          ...(command.pinned !== undefined ? { pinnedAt: command.pinned ? occurredAt : null } : {}),
           ...(command.modelSelection !== undefined
             ? { modelSelection: command.modelSelection }
             : {}),
diff --git a/apps/server/src/orchestration/projector.test.ts b/apps/server/src/orchestration/projector.test.ts
index 3dcdd19250..eef819cb6c 100644
--- a/apps/server/src/orchestration/projector.test.ts
+++ b/apps/server/src/orchestration/projector.test.ts
@@ -76,6 +76,7 @@ describe("orchestration projector", () => {
         id: "thread-1",
         projectId: "project-1",
         title: "demo",
+        pinnedAt: null,
         modelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
@@ -98,6 +99,99 @@ describe("orchestration projector", () => {
     ]);
   });
 
+  it("applies pin updates for projects and threads", async () => {
+    const now = new Date().toISOString();
+    const later = new Date(Date.parse(now) + 1_000).toISOString();
+    const withProject = await Effect.runPromise(
+      projectEvent(
+        createEmptyReadModel(now),
+        makeEvent({
+          sequence: 1,
+          type: "project.created",
+          aggregateKind: "project",
+          aggregateId: "project-1",
+          occurredAt: now,
+          commandId: "cmd-project-create",
+          payload: {
+            projectId: "project-1",
+            title: "demo",
+            workspaceRoot: "/tmp/project-1",
+            defaultModelSelection: null,
+            scripts: [],
+            createdAt: now,
+            updatedAt: now,
+          },
+        }),
+      ),
+    );
+    const withPinnedProject = await Effect.runPromise(
+      projectEvent(
+        withProject,
+        makeEvent({
+          sequence: 2,
+          type: "project.meta-updated",
+          aggregateKind: "project",
+          aggregateId: "project-1",
+          occurredAt: later,
+          commandId: "cmd-project-pin",
+          payload: {
+            projectId: "project-1",
+            pinnedAt: later,
+            updatedAt: later,
+          },
+        }),
+      ),
+    );
+    expect(withPinnedProject.projects[0]?.pinnedAt).toBe(later);
+
+    const withThread = await Effect.runPromise(
+      projectEvent(
+        withPinnedProject,
+        makeEvent({
+          sequence: 3,
+          type: "thread.created",
+          aggregateKind: "thread",
+          aggregateId: "thread-1",
+          occurredAt: now,
+          commandId: "cmd-thread-create",
+          payload: {
+            threadId: "thread-1",
+            projectId: "project-1",
+            title: "demo",
+            modelSelection: {
+              provider: "codex",
+              model: "gpt-5-codex",
+            },
+            runtimeMode: "full-access",
+            branch: null,
+            worktreePath: null,
+            createdAt: now,
+            updatedAt: now,
+          },
+        }),
+      ),
+    );
+    const withPinnedThread = await Effect.runPromise(
+      projectEvent(
+        withThread,
+        makeEvent({
+          sequence: 4,
+          type: "thread.meta-updated",
+          aggregateKind: "thread",
+          aggregateId: "thread-1",
+          occurredAt: later,
+          commandId: "cmd-thread-pin",
+          payload: {
+            threadId: "thread-1",
+            pinnedAt: later,
+            updatedAt: later,
+          },
+        }),
+      ),
+    );
+    expect(withPinnedThread.threads[0]?.pinnedAt).toBe(later);
+  });
+
   it("fails when event payload cannot be decoded by runtime schema", async () => {
     const now = new Date().toISOString();
     const model = createEmptyReadModel(now);
diff --git a/apps/server/src/orchestration/projector.ts b/apps/server/src/orchestration/projector.ts
index deb8a6d44d..dd41062266 100644
--- a/apps/server/src/orchestration/projector.ts
+++ b/apps/server/src/orchestration/projector.ts
@@ -183,6 +183,7 @@ export function projectEvent(
             id: payload.projectId,
             title: payload.title,
             workspaceRoot: payload.workspaceRoot,
+            pinnedAt: payload.pinnedAt,
             defaultModelSelection: payload.defaultModelSelection,
             scripts: payload.scripts,
             createdAt: payload.createdAt,
@@ -213,6 +214,7 @@ export function projectEvent(
                   ...(payload.workspaceRoot !== undefined
                     ? { workspaceRoot: payload.workspaceRoot }
                     : {}),
+                  ...(payload.pinnedAt !== undefined ? { pinnedAt: payload.pinnedAt } : {}),
                   ...(payload.defaultModelSelection !== undefined
                     ? { defaultModelSelection: payload.defaultModelSelection }
                     : {}),
@@ -254,6 +256,7 @@ export function projectEvent(
             id: payload.threadId,
             projectId: payload.projectId,
             title: payload.title,
+            pinnedAt: payload.pinnedAt,
             modelSelection: payload.modelSelection,
             runtimeMode: payload.runtimeMode,
             interactionMode: payload.interactionMode,
@@ -320,6 +323,7 @@ export function projectEvent(
           ...nextBase,
           threads: updateThread(nextBase.threads, payload.threadId, {
             ...(payload.title !== undefined ? { title: payload.title } : {}),
+            ...(payload.pinnedAt !== undefined ? { pinnedAt: payload.pinnedAt } : {}),
             ...(payload.modelSelection !== undefined
               ? { modelSelection: payload.modelSelection }
               : {}),
diff --git a/apps/server/src/persistence/Layers/ProjectionProjects.ts b/apps/server/src/persistence/Layers/ProjectionProjects.ts
index 7ff19f55ae..b31bb5c9a5 100644
--- a/apps/server/src/persistence/Layers/ProjectionProjects.ts
+++ b/apps/server/src/persistence/Layers/ProjectionProjects.ts
@@ -14,6 +14,7 @@ import {
 
 const ProjectionProjectDbRow = ProjectionProject.mapFields(
   Struct.assign({
+    pinnedAt: Schema.NullOr(Schema.String),
     defaultModelSelection: Schema.NullOr(Schema.fromJsonString(ModelSelection)),
     scripts: Schema.fromJsonString(Schema.Array(ProjectScript)),
   }),
@@ -31,6 +32,7 @@ const makeProjectionProjectRepository = Effect.gen(function* () {
           project_id,
           title,
           workspace_root,
+          pinned_at,
           default_model_selection_json,
           scripts_json,
           created_at,
@@ -41,6 +43,7 @@ const makeProjectionProjectRepository = Effect.gen(function* () {
           ${row.projectId},
           ${row.title},
           ${row.workspaceRoot},
+          ${row.pinnedAt},
           ${row.defaultModelSelection !== null ? JSON.stringify(row.defaultModelSelection) : null},
           ${JSON.stringify(row.scripts)},
           ${row.createdAt},
@@ -51,6 +54,7 @@ const makeProjectionProjectRepository = Effect.gen(function* () {
         DO UPDATE SET
           title = excluded.title,
           workspace_root = excluded.workspace_root,
+          pinned_at = excluded.pinned_at,
           default_model_selection_json = excluded.default_model_selection_json,
           scripts_json = excluded.scripts_json,
           created_at = excluded.created_at,
@@ -68,6 +72,7 @@ const makeProjectionProjectRepository = Effect.gen(function* () {
           project_id AS "projectId",
           title,
           workspace_root AS "workspaceRoot",
+          pinned_at AS "pinnedAt",
           default_model_selection_json AS "defaultModelSelection",
           scripts_json AS "scripts",
           created_at AS "createdAt",
@@ -87,6 +92,7 @@ const makeProjectionProjectRepository = Effect.gen(function* () {
           project_id AS "projectId",
           title,
           workspace_root AS "workspaceRoot",
+          pinned_at AS "pinnedAt",
           default_model_selection_json AS "defaultModelSelection",
           scripts_json AS "scripts",
           created_at AS "createdAt",
diff --git a/apps/server/src/persistence/Layers/ProjectionRepositories.test.ts b/apps/server/src/persistence/Layers/ProjectionRepositories.test.ts
index b0e1774837..a9525e5dde 100644
--- a/apps/server/src/persistence/Layers/ProjectionRepositories.test.ts
+++ b/apps/server/src/persistence/Layers/ProjectionRepositories.test.ts
@@ -27,6 +27,7 @@ projectionRepositoriesLayer("Projection repositories", (it) => {
         projectId: ProjectId.makeUnsafe("project-null-options"),
         title: "Null options project",
         workspaceRoot: "/tmp/project-null-options",
+        pinnedAt: "2026-03-24T00:00:00.000Z",
         defaultModelSelection: {
           provider: "codex",
           model: "gpt-5.4",
@@ -60,6 +61,7 @@ projectionRepositoriesLayer("Projection repositories", (it) => {
       const persisted = yield* projects.getById({
         projectId: ProjectId.makeUnsafe("project-null-options"),
       });
+      assert.strictEqual(Option.getOrNull(persisted)?.pinnedAt, "2026-03-24T00:00:00.000Z");
       assert.deepStrictEqual(Option.getOrNull(persisted)?.defaultModelSelection, {
         provider: "codex",
         model: "gpt-5.4",
@@ -76,6 +78,7 @@ projectionRepositoriesLayer("Projection repositories", (it) => {
         threadId: ThreadId.makeUnsafe("thread-null-options"),
         projectId: ProjectId.makeUnsafe("project-null-options"),
         title: "Null options thread",
+        pinnedAt: "2026-03-24T00:00:00.000Z",
         modelSelection: {
           provider: "claudeAgent",
           model: "claude-opus-4-6",
@@ -114,6 +117,7 @@ projectionRepositoriesLayer("Projection repositories", (it) => {
       const persisted = yield* threads.getById({
         threadId: ThreadId.makeUnsafe("thread-null-options"),
       });
+      assert.strictEqual(Option.getOrNull(persisted)?.pinnedAt, "2026-03-24T00:00:00.000Z");
       assert.deepStrictEqual(Option.getOrNull(persisted)?.modelSelection, {
         provider: "claudeAgent",
         model: "claude-opus-4-6",
diff --git a/apps/server/src/persistence/Layers/ProjectionThreads.ts b/apps/server/src/persistence/Layers/ProjectionThreads.ts
index 48dd51fdca..e65cea7ada 100644
--- a/apps/server/src/persistence/Layers/ProjectionThreads.ts
+++ b/apps/server/src/persistence/Layers/ProjectionThreads.ts
@@ -15,6 +15,7 @@ import { ModelSelection } from "@t3tools/contracts";
 
 const ProjectionThreadDbRow = ProjectionThread.mapFields(
   Struct.assign({
+    pinnedAt: Schema.NullOr(Schema.String),
     modelSelection: Schema.fromJsonString(ModelSelection),
   }),
 );
@@ -31,6 +32,7 @@ const makeProjectionThreadRepository = Effect.gen(function* () {
           thread_id,
           project_id,
           title,
+          pinned_at,
           model_selection_json,
           runtime_mode,
           interaction_mode,
@@ -46,6 +48,7 @@ const makeProjectionThreadRepository = Effect.gen(function* () {
           ${row.threadId},
           ${row.projectId},
           ${row.title},
+          ${row.pinnedAt},
           ${JSON.stringify(row.modelSelection)},
           ${row.runtimeMode},
           ${row.interactionMode},
@@ -61,6 +64,7 @@ const makeProjectionThreadRepository = Effect.gen(function* () {
         DO UPDATE SET
           project_id = excluded.project_id,
           title = excluded.title,
+          pinned_at = excluded.pinned_at,
           model_selection_json = excluded.model_selection_json,
           runtime_mode = excluded.runtime_mode,
           interaction_mode = excluded.interaction_mode,
@@ -83,6 +87,7 @@ const makeProjectionThreadRepository = Effect.gen(function* () {
           thread_id AS "threadId",
           project_id AS "projectId",
           title,
+          pinned_at AS "pinnedAt",
           model_selection_json AS "modelSelection",
           runtime_mode AS "runtimeMode",
           interaction_mode AS "interactionMode",
@@ -107,6 +112,7 @@ const makeProjectionThreadRepository = Effect.gen(function* () {
           thread_id AS "threadId",
           project_id AS "projectId",
           title,
+          pinned_at AS "pinnedAt",
           model_selection_json AS "modelSelection",
           runtime_mode AS "runtimeMode",
           interaction_mode AS "interactionMode",
diff --git a/apps/server/src/persistence/Migrations.ts b/apps/server/src/persistence/Migrations.ts
index c759665f06..6827c42b20 100644
--- a/apps/server/src/persistence/Migrations.ts
+++ b/apps/server/src/persistence/Migrations.ts
@@ -31,6 +31,7 @@ import Migration0015 from "./Migrations/015_ProjectionTurnsSourceProposedPlan.ts
 import Migration0016 from "./Migrations/016_CanonicalizeModelSelections.ts";
 import Migration0017 from "./Migrations/017_ProjectionThreadsArchivedAt.ts";
 import Migration0018 from "./Migrations/018_ProjectionThreadsArchivedAtIndex.ts";
+import Migration0019 from "./Migrations/019_ProjectionPins.ts";
 
 /**
  * Migration loader with all migrations defined inline.
@@ -61,6 +62,7 @@ export const migrationEntries = [
   [16, "CanonicalizeModelSelections", Migration0016],
   [17, "ProjectionThreadsArchivedAt", Migration0017],
   [18, "ProjectionThreadsArchivedAtIndex", Migration0018],
+  [19, "ProjectionPins", Migration0019],
 ] as const;
 
 export const makeMigrationLoader = (throughId?: number) =>
diff --git a/apps/server/src/persistence/Migrations/019_ProjectionPins.ts b/apps/server/src/persistence/Migrations/019_ProjectionPins.ts
new file mode 100644
index 0000000000..257a31e5e1
--- /dev/null
+++ b/apps/server/src/persistence/Migrations/019_ProjectionPins.ts
@@ -0,0 +1,26 @@
+import * as Effect from "effect/Effect";
+import * as SqlClient from "effect/unstable/sql/SqlClient";
+
+export default Effect.gen(function* () {
+  const sql = yield* SqlClient.SqlClient;
+
+  const projectColumns = yield* sql<{ readonly name: string }>`
+    PRAGMA table_info(projection_projects)
+  `;
+  if (!projectColumns.some((column) => column.name === "pinned_at")) {
+    yield* sql`
+      ALTER TABLE projection_projects
+      ADD COLUMN pinned_at TEXT
+    `;
+  }
+
+  const threadColumns = yield* sql<{ readonly name: string }>`
+    PRAGMA table_info(projection_threads)
+  `;
+  if (!threadColumns.some((column) => column.name === "pinned_at")) {
+    yield* sql`
+      ALTER TABLE projection_threads
+      ADD COLUMN pinned_at TEXT
+    `;
+  }
+});
diff --git a/apps/server/src/persistence/Services/ProjectionProjects.ts b/apps/server/src/persistence/Services/ProjectionProjects.ts
index 996ffe6e7b..17b1353c08 100644
--- a/apps/server/src/persistence/Services/ProjectionProjects.ts
+++ b/apps/server/src/persistence/Services/ProjectionProjects.ts
@@ -16,6 +16,7 @@ export const ProjectionProject = Schema.Struct({
   projectId: ProjectId,
   title: Schema.String,
   workspaceRoot: Schema.String,
+  pinnedAt: Schema.NullOr(IsoDateTime),
   defaultModelSelection: Schema.NullOr(ModelSelection),
   scripts: Schema.Array(ProjectScript),
   createdAt: IsoDateTime,
diff --git a/apps/server/src/persistence/Services/ProjectionThreads.ts b/apps/server/src/persistence/Services/ProjectionThreads.ts
index 59505c1253..7937b2a66e 100644
--- a/apps/server/src/persistence/Services/ProjectionThreads.ts
+++ b/apps/server/src/persistence/Services/ProjectionThreads.ts
@@ -24,6 +24,7 @@ export const ProjectionThread = Schema.Struct({
   threadId: ThreadId,
   projectId: ProjectId,
   title: Schema.String,
+  pinnedAt: Schema.NullOr(IsoDateTime),
   modelSelection: ModelSelection,
   runtimeMode: RuntimeMode,
   interactionMode: ProviderInteractionMode,
diff --git a/apps/server/src/wsServer.test.ts b/apps/server/src/wsServer.test.ts
index 0e06650fe6..8227a45718 100644
--- a/apps/server/src/wsServer.test.ts
+++ b/apps/server/src/wsServer.test.ts
@@ -1221,6 +1221,7 @@ describe("WebSocket Server", () => {
       projectId: "project-diff",
       title: "Diff Project",
       workspaceRoot,
+      pinned: false,
       defaultModelSelection: {
         provider: "codex",
         model: "gpt-5-codex",
@@ -1234,6 +1235,7 @@ describe("WebSocket Server", () => {
       threadId: "thread-diff",
       projectId: "project-diff",
       title: "Diff Thread",
+      pinned: false,
       modelSelection: {
         provider: "codex",
         model: "gpt-5-codex",
@@ -1306,6 +1308,7 @@ describe("WebSocket Server", () => {
       projectId: "project-1",
       title: "WS Project",
       workspaceRoot,
+      pinned: false,
       defaultModelSelection: {
         provider: "codex",
         model: "gpt-5-codex",
@@ -1319,6 +1322,7 @@ describe("WebSocket Server", () => {
       threadId: "thread-1",
       projectId: "project-1",
       title: "Thread 1",
+      pinned: false,
       modelSelection: {
         provider: "codex",
         model: "gpt-5-codex",
diff --git a/apps/server/src/wsServer.ts b/apps/server/src/wsServer.ts
index 25f8158926..eee9e41c8b 100644
--- a/apps/server/src/wsServer.ts
+++ b/apps/server/src/wsServer.ts
@@ -675,6 +675,7 @@ export const createServer = Effect.fn(function* (): Effect.fn.Return<
           projectId: bootstrapProjectId,
           title: bootstrapProjectTitle,
           workspaceRoot: cwd,
+          pinned: false,
           defaultModelSelection: bootstrapProjectDefaultModelSelection,
           createdAt,
         });
@@ -698,6 +699,7 @@ export const createServer = Effect.fn(function* (): Effect.fn.Return<
           threadId,
           projectId: bootstrapProjectId,
           title: "New thread",
+          pinned: false,
           modelSelection: bootstrapProjectDefaultModelSelection,
           interactionMode: DEFAULT_PROVIDER_INTERACTION_MODE,
           runtimeMode: "full-access",
diff --git a/apps/web/src/components/ChatView.browser.tsx b/apps/web/src/components/ChatView.browser.tsx
index 20816d6935..a70ff3fea0 100644
--- a/apps/web/src/components/ChatView.browser.tsx
+++ b/apps/web/src/components/ChatView.browser.tsx
@@ -237,6 +237,7 @@ function createSnapshotForTargetUser(options: {
         id: PROJECT_ID,
         title: "Project",
         workspaceRoot: "/repo/project",
+        pinnedAt: null,
         defaultModelSelection: {
           provider: "codex",
           model: "gpt-5",
@@ -252,6 +253,7 @@ function createSnapshotForTargetUser(options: {
         id: THREAD_ID,
         projectId: PROJECT_ID,
         title: "Browser test thread",
+        pinnedAt: null,
         modelSelection: {
           provider: "codex",
           model: "gpt-5",
@@ -310,6 +312,7 @@ function addThreadToSnapshot(
         id: threadId,
         projectId: PROJECT_ID,
         title: "New thread",
+        pinnedAt: null,
         modelSelection: {
           provider: "codex",
           model: "gpt-5",
@@ -357,6 +360,7 @@ function createThreadCreatedEvent(threadId: ThreadId, sequence: number): Orchest
       threadId,
       projectId: PROJECT_ID,
       title: "New thread",
+      pinnedAt: null,
       modelSelection: {
         provider: "codex",
         model: "gpt-5",
diff --git a/apps/web/src/components/ChatView.logic.test.ts b/apps/web/src/components/ChatView.logic.test.ts
index 80c842d91f..45e0efdac9 100644
--- a/apps/web/src/components/ChatView.logic.test.ts
+++ b/apps/web/src/components/ChatView.logic.test.ts
@@ -89,6 +89,7 @@ const makeThread = (input?: {
   codexThreadId: null,
   projectId: ProjectId.makeUnsafe("project-1"),
   title: "Thread",
+  pinnedAt: null,
   modelSelection: { provider: "codex" as const, model: "gpt-5.4" },
   runtimeMode: "full-access" as const,
   interactionMode: "default" as const,
@@ -247,6 +248,7 @@ describe("hasServerAcknowledgedLocalDispatch", () => {
       codexThreadId: null,
       projectId,
       title: "Thread",
+      pinnedAt: null,
       modelSelection: { provider: "codex", model: "gpt-5.4" },
       runtimeMode: "full-access",
       interactionMode: "default",
@@ -283,6 +285,7 @@ describe("hasServerAcknowledgedLocalDispatch", () => {
       codexThreadId: null,
       projectId,
       title: "Thread",
+      pinnedAt: null,
       modelSelection: { provider: "codex", model: "gpt-5.4" },
       runtimeMode: "full-access",
       interactionMode: "default",
@@ -328,6 +331,7 @@ describe("hasServerAcknowledgedLocalDispatch", () => {
       codexThreadId: null,
       projectId,
       title: "Thread",
+      pinnedAt: null,
       modelSelection: { provider: "codex", model: "gpt-5.4" },
       runtimeMode: "full-access",
       interactionMode: "default",
diff --git a/apps/web/src/components/ChatView.logic.ts b/apps/web/src/components/ChatView.logic.ts
index 1821c65ed9..a1d70b0485 100644
--- a/apps/web/src/components/ChatView.logic.ts
+++ b/apps/web/src/components/ChatView.logic.ts
@@ -26,6 +26,7 @@ export function buildLocalDraftThread(
     codexThreadId: null,
     projectId: draftThread.projectId,
     title: "New thread",
+    pinnedAt: null,
     modelSelection: fallbackModelSelection,
     runtimeMode: draftThread.runtimeMode,
     interactionMode: draftThread.interactionMode,
diff --git a/apps/web/src/components/ChatView.tsx b/apps/web/src/components/ChatView.tsx
index 7562f845e2..8cc60ae17b 100644
--- a/apps/web/src/components/ChatView.tsx
+++ b/apps/web/src/components/ChatView.tsx
@@ -2774,6 +2774,7 @@ export default function ChatView({ threadId }: ChatViewProps) {
           threadId: threadIdForSend,
           projectId: activeProject.id,
           title,
+          pinned: false,
           modelSelection: threadCreateModelSelection,
           runtimeMode,
           interactionMode,
@@ -3221,6 +3222,7 @@ export default function ChatView({ threadId }: ChatViewProps) {
         threadId: nextThreadId,
         projectId: activeProject.id,
         title: nextThreadTitle,
+        pinned: false,
         modelSelection: nextThreadModelSelection,
         runtimeMode,
         interactionMode: "default",
diff --git a/apps/web/src/components/KeybindingsToast.browser.tsx b/apps/web/src/components/KeybindingsToast.browser.tsx
index 224bd2f887..613591c6f0 100644
--- a/apps/web/src/components/KeybindingsToast.browser.tsx
+++ b/apps/web/src/components/KeybindingsToast.browser.tsx
@@ -76,6 +76,7 @@ function createMinimalSnapshot(): OrchestrationReadModel {
         id: PROJECT_ID,
         title: "Project",
         workspaceRoot: "/repo/project",
+        pinnedAt: null,
         defaultModelSelection: {
           provider: "codex",
           model: "gpt-5",
@@ -91,6 +92,7 @@ function createMinimalSnapshot(): OrchestrationReadModel {
         id: THREAD_ID,
         projectId: PROJECT_ID,
         title: "Test thread",
+        pinnedAt: null,
         modelSelection: {
           provider: "codex",
           model: "gpt-5",
diff --git a/apps/web/src/components/Sidebar.logic.test.ts b/apps/web/src/components/Sidebar.logic.test.ts
index d4cd25db4c..308689ee92 100644
--- a/apps/web/src/components/Sidebar.logic.test.ts
+++ b/apps/web/src/components/Sidebar.logic.test.ts
@@ -592,6 +592,7 @@ function makeProject(overrides: Partial<Project> = {}): Project {
     id: ProjectId.makeUnsafe("project-1"),
     name: "Project",
     cwd: "/tmp/project",
+    pinnedAt: null,
     defaultModelSelection: {
       provider: "codex",
       model: "gpt-5.4",
@@ -610,6 +611,7 @@ function makeThread(overrides: Partial<Thread> = {}): Thread {
     codexThreadId: null,
     projectId: ProjectId.makeUnsafe("project-1"),
     title: "Thread",
+    pinnedAt: null,
     modelSelection: {
       provider: "codex",
       model: "gpt-5.4",
@@ -758,6 +760,73 @@ describe("sortThreadsForSidebar", () => {
       ThreadId.makeUnsafe("thread-2"),
     ]);
   });
+
+  it("puts pinned threads ahead of unpinned threads in auto-sort modes", () => {
+    const sorted = sortThreadsForSidebar(
+      [
+        {
+          ...makeThread({
+            id: ThreadId.makeUnsafe("thread-1"),
+            createdAt: "2026-03-09T10:00:00.000Z",
+            updatedAt: "2026-03-09T10:01:00.000Z",
+          }),
+          pinnedAt: "2026-03-09T10:20:00.000Z",
+        },
+        {
+          ...makeThread({
+            id: ThreadId.makeUnsafe("thread-2"),
+            createdAt: "2026-03-09T10:05:00.000Z",
+            updatedAt: "2026-03-09T10:05:00.000Z",
+          }),
+          pinnedAt: null,
+        },
+      ],
+      "updated_at",
+    );
+
+    expect(sorted.map((thread) => thread.id)).toEqual([
+      ThreadId.makeUnsafe("thread-1"),
+      ThreadId.makeUnsafe("thread-2"),
+    ]);
+  });
+
+  it("sorts pinned threads by latest pin timestamp before activity recency", () => {
+    const sorted = sortThreadsForSidebar(
+      [
+        {
+          ...makeThread({
+            id: ThreadId.makeUnsafe("thread-1"),
+            createdAt: "2026-03-09T10:01:00.000Z",
+            updatedAt: "2026-03-09T10:01:00.000Z",
+          }),
+          pinnedAt: "2026-03-09T10:10:00.000Z",
+        },
+        {
+          ...makeThread({
+            id: ThreadId.makeUnsafe("thread-2"),
+            createdAt: "2026-03-09T10:05:00.000Z",
+            updatedAt: "2026-03-09T10:05:00.000Z",
+          }),
+          pinnedAt: "2026-03-09T10:20:00.000Z",
+        },
+        {
+          ...makeThread({
+            id: ThreadId.makeUnsafe("thread-3"),
+            createdAt: "2026-03-09T10:10:00.000Z",
+            updatedAt: "2026-03-09T10:10:00.000Z",
+          }),
+          pinnedAt: null,
+        },
+      ],
+      "updated_at",
+    );
+
+    expect(sorted.map((thread) => thread.id)).toEqual([
+      ThreadId.makeUnsafe("thread-2"),
+      ThreadId.makeUnsafe("thread-1"),
+      ThreadId.makeUnsafe("thread-3"),
+    ]);
+  });
 });
 
 describe("getFallbackThreadIdAfterDelete", () => {
@@ -796,6 +865,41 @@ describe("getFallbackThreadIdAfterDelete", () => {
     expect(fallbackThreadId).toBe(ThreadId.makeUnsafe("thread-newest"));
   });
 
+  it("respects pinning when choosing the fallback thread after delete", () => {
+    const fallbackThreadId = getFallbackThreadIdAfterDelete({
+      threads: [
+        {
+          ...makeThread({
+            id: ThreadId.makeUnsafe("thread-active"),
+            projectId: ProjectId.makeUnsafe("project-1"),
+            updatedAt: "2026-03-09T10:05:00.000Z",
+          }),
+          pinnedAt: null,
+        },
+        {
+          ...makeThread({
+            id: ThreadId.makeUnsafe("thread-pinned"),
+            projectId: ProjectId.makeUnsafe("project-1"),
+            updatedAt: "2026-03-09T10:03:00.000Z",
+          }),
+          pinnedAt: "2026-03-09T10:20:00.000Z",
+        },
+        {
+          ...makeThread({
+            id: ThreadId.makeUnsafe("thread-newer"),
+            projectId: ProjectId.makeUnsafe("project-1"),
+            updatedAt: "2026-03-09T10:10:00.000Z",
+          }),
+          pinnedAt: null,
+        },
+      ],
+      deletedThreadId: ThreadId.makeUnsafe("thread-active"),
+      sortOrder: "updated_at",
+    });
+
+    expect(fallbackThreadId).toBe(ThreadId.makeUnsafe("thread-pinned"));
+  });
+
   it("skips other threads being deleted in the same action", () => {
     const fallbackThreadId = getFallbackThreadIdAfterDelete({
       threads: [
@@ -900,6 +1004,65 @@ describe("sortProjectsForSidebar", () => {
     ]);
   });
 
+  it("puts pinned projects ahead of unpinned projects in auto-sort modes", () => {
+    const sorted = sortProjectsForSidebar(
+      [
+        makeProject({
+          id: ProjectId.makeUnsafe("project-1"),
+          name: "Pinned older project",
+          pinnedAt: "2026-03-09T10:20:00.000Z",
+          updatedAt: "2026-03-09T10:01:00.000Z",
+        }),
+        makeProject({
+          id: ProjectId.makeUnsafe("project-2"),
+          name: "Unpinned newer project",
+          pinnedAt: null,
+          updatedAt: "2026-03-09T10:05:00.000Z",
+        }),
+      ],
+      [],
+      "updated_at",
+    );
+
+    expect(sorted.map((project) => project.id)).toEqual([
+      ProjectId.makeUnsafe("project-1"),
+      ProjectId.makeUnsafe("project-2"),
+    ]);
+  });
+
+  it("sorts pinned projects by latest pin timestamp before project recency", () => {
+    const sorted = sortProjectsForSidebar(
+      [
+        makeProject({
+          id: ProjectId.makeUnsafe("project-1"),
+          name: "Pinned older project",
+          pinnedAt: "2026-03-09T10:10:00.000Z",
+          updatedAt: "2026-03-09T10:01:00.000Z",
+        }),
+        makeProject({
+          id: ProjectId.makeUnsafe("project-2"),
+          name: "Pinned newer project",
+          pinnedAt: "2026-03-09T10:20:00.000Z",
+          updatedAt: "2026-03-09T10:05:00.000Z",
+        }),
+        makeProject({
+          id: ProjectId.makeUnsafe("project-3"),
+          name: "Unpinned project",
+          pinnedAt: null,
+          updatedAt: "2026-03-09T10:10:00.000Z",
+        }),
+      ],
+      [],
+      "updated_at",
+    );
+
+    expect(sorted.map((project) => project.id)).toEqual([
+      ProjectId.makeUnsafe("project-2"),
+      ProjectId.makeUnsafe("project-1"),
+      ProjectId.makeUnsafe("project-3"),
+    ]);
+  });
+
   it("falls back to name and id ordering when projects have no sortable timestamps", () => {
     const sorted = sortProjectsForSidebar(
       [
diff --git a/apps/web/src/components/Sidebar.logic.ts b/apps/web/src/components/Sidebar.logic.ts
index 16c7752f74..1a3c6f8a5a 100644
--- a/apps/web/src/components/Sidebar.logic.ts
+++ b/apps/web/src/components/Sidebar.logic.ts
@@ -16,10 +16,12 @@ type SidebarProject = {
   name: string;
   createdAt?: string | undefined;
   updatedAt?: string | undefined;
+  pinnedAt?: string | null | undefined;
 };
 type SidebarThreadSortInput = Pick<Thread, "createdAt" | "updatedAt"> & {
   latestUserMessageAt?: string | null;
   messages?: Pick<Thread["messages"][number], "createdAt" | "role">[];
+  pinnedAt?: string | null | undefined;
 };
 
 export type ThreadTraversalDirection = "previous" | "next";
@@ -448,10 +450,24 @@ function getThreadSortTimestamp(
   return getLatestUserMessageTimestamp(thread);
 }
 
+function getPinnedSortTimestamp(input: { pinnedAt?: string | null | undefined }): number | null {
+  return toSortableTimestamp(input.pinnedAt ?? undefined);
+}
+
 export function sortThreadsForSidebar<
   T extends Pick<Thread, "id" | "createdAt" | "updatedAt"> & SidebarThreadSortInput,
 >(threads: readonly T[], sortOrder: SidebarThreadSortOrder): T[] {
   return threads.toSorted((left, right) => {
+    const leftPinnedAt = getPinnedSortTimestamp(left);
+    const rightPinnedAt = getPinnedSortTimestamp(right);
+    const leftPinned = leftPinnedAt !== null;
+    const rightPinned = rightPinnedAt !== null;
+    if (leftPinned !== rightPinned) {
+      return rightPinned ? 1 : -1;
+    }
+    if (leftPinnedAt !== null && rightPinnedAt !== null && leftPinnedAt !== rightPinnedAt) {
+      return rightPinnedAt > leftPinnedAt ? 1 : -1;
+    }
     const rightTimestamp = getThreadSortTimestamp(right, sortOrder);
     const leftTimestamp = getThreadSortTimestamp(left, sortOrder);
     const byTimestamp =
@@ -526,6 +542,16 @@ export function sortProjectsForSidebar<
   }
 
   return [...projects].toSorted((left, right) => {
+    const leftPinnedAt = getPinnedSortTimestamp(left);
+    const rightPinnedAt = getPinnedSortTimestamp(right);
+    const leftPinned = leftPinnedAt !== null;
+    const rightPinned = rightPinnedAt !== null;
+    if (leftPinned !== rightPinned) {
+      return rightPinned ? 1 : -1;
+    }
+    if (leftPinnedAt !== null && rightPinnedAt !== null && leftPinnedAt !== rightPinnedAt) {
+      return rightPinnedAt > leftPinnedAt ? 1 : -1;
+    }
     const rightTimestamp = getProjectSortTimestamp(
       right,
       threadsByProjectId.get(right.id) ?? [],
diff --git a/apps/web/src/components/Sidebar.tsx b/apps/web/src/components/Sidebar.tsx
index efa5124288..200569500e 100644
--- a/apps/web/src/components/Sidebar.tsx
+++ b/apps/web/src/components/Sidebar.tsx
@@ -4,6 +4,7 @@ import {
   ChevronRightIcon,
   FolderIcon,
   GitPullRequestIcon,
+  PinIcon,
   PlusIcon,
   SettingsIcon,
   SquarePenIcon,
@@ -152,6 +153,7 @@ type SidebarThreadSnapshot = Pick<
   | "id"
   | "interactionMode"
   | "latestTurn"
+  | "pinnedAt"
   | "projectId"
   | "proposedPlans"
   | "session"
@@ -163,9 +165,7 @@ type SidebarThreadSnapshot = Pick<
   latestUserMessageAt: string | null;
 };
 
-type SidebarProjectSnapshot = Project & {
-  expanded: boolean;
-};
+type SidebarProjectSnapshot = Project & { expanded: boolean };
 
 const sidebarThreadSnapshotCache = new WeakMap<
   Thread,
@@ -206,6 +206,7 @@ function toSidebarThreadSnapshot(
     updatedAt: thread.updatedAt,
     archivedAt: thread.archivedAt,
     latestTurn: thread.latestTurn,
+    pinnedAt: thread.pinnedAt,
     lastVisitedAt,
     branch: thread.branch,
     worktreePath: thread.worktreePath,
@@ -675,6 +676,7 @@ export default function Sidebar() {
           projectId,
           title,
           workspaceRoot: cwd,
+          pinned: false,
           defaultModelSelection: {
             provider: "codex",
             model: DEFAULT_MODEL_BY_PROVIDER.codex,
@@ -832,6 +834,42 @@ export default function Sidebar() {
       });
     },
   });
+  const setThreadPinned = useCallback(async (thread: SidebarThreadSnapshot, pinned: boolean) => {
+    const api = readNativeApi();
+    if (!api) return;
+    try {
+      await api.orchestration.dispatchCommand({
+        type: "thread.meta.update",
+        commandId: newCommandId(),
+        threadId: thread.id,
+        pinned,
+      });
+    } catch (error) {
+      toastManager.add({
+        type: "error",
+        title: `${pinned ? "Pin" : "Unpin"} thread failed`,
+        description: error instanceof Error ? error.message : "An error occurred.",
+      });
+    }
+  }, []);
+  const setProjectPinned = useCallback(async (project: Project, pinned: boolean) => {
+    const api = readNativeApi();
+    if (!api) return;
+    try {
+      await api.orchestration.dispatchCommand({
+        type: "project.meta.update",
+        commandId: newCommandId(),
+        projectId: project.id,
+        pinned,
+      });
+    } catch (error) {
+      toastManager.add({
+        type: "error",
+        title: `${pinned ? "Pin" : "Unpin"} project failed`,
+        description: error instanceof Error ? error.message : "An error occurred.",
+      });
+    }
+  }, []);
   const handleThreadContextMenu = useCallback(
     async (threadId: ThreadId, position: { x: number; y: number }) => {
       const api = readNativeApi();
@@ -842,6 +880,10 @@ export default function Sidebar() {
         thread.worktreePath ?? projectCwdById.get(thread.projectId) ?? null;
       const clicked = await api.contextMenu.show(
         [
+          {
+            id: "toggle-pin",
+            label: thread.pinnedAt !== null ? "Unpin thread" : "Pin thread",
+          },
           { id: "rename", label: "Rename thread" },
           { id: "mark-unread", label: "Mark unread" },
           { id: "copy-path", label: "Copy Path" },
@@ -851,6 +893,11 @@ export default function Sidebar() {
         position,
       );
 
+      if (clicked === "toggle-pin") {
+        await setThreadPinned(thread, thread.pinnedAt === null);
+        return;
+      }
+
       if (clicked === "rename") {
         setRenamingThreadId(threadId);
         setRenamingTitle(thread.title);
@@ -900,6 +947,7 @@ export default function Sidebar() {
       markThreadUnread,
       projectCwdById,
       threads,
+      setThreadPinned,
     ],
   );
 
@@ -1018,11 +1066,19 @@ export default function Sidebar() {
 
       const clicked = await api.contextMenu.show(
         [
+          {
+            id: "toggle-pin",
+            label: project.pinnedAt !== null ? "Unpin project" : "Pin project",
+          },
           { id: "copy-path", label: "Copy Project Path" },
           { id: "delete", label: "Remove project", destructive: true },
         ],
         position,
       );
+      if (clicked === "toggle-pin") {
+        await setProjectPinned(project, project.pinnedAt === null);
+        return;
+      }
       if (clicked === "copy-path") {
         copyPathToClipboard(project.cwd, { path: project.cwd });
         return;
@@ -1069,6 +1125,7 @@ export default function Sidebar() {
       copyPathToClipboard,
       getDraftThreadByProjectId,
       projects,
+      setProjectPinned,
       threads,
     ],
   );
@@ -1160,6 +1217,32 @@ export default function Sidebar() {
     () => threads.filter((thread) => thread.archivedAt === null),
     [threads],
   );
+  const threadStatusById = useMemo(
+    () =>
+      new Map(
+        visibleThreads.map((thread) => [
+          thread.id,
+          resolveThreadStatusPill({
+            thread,
+            hasPendingApprovals: derivePendingApprovals(thread.activities).length > 0,
+            hasPendingUserInput: derivePendingUserInputs(thread.activities).length > 0,
+          }),
+        ]),
+      ),
+    [visibleThreads],
+  );
+  const globalPinnedThreads = useMemo(
+    () =>
+      sortThreadsForSidebar(
+        visibleThreads.filter((thread) => thread.pinnedAt !== null),
+        appSettings.sidebarThreadSortOrder,
+      ),
+    [appSettings.sidebarThreadSortOrder, visibleThreads],
+  );
+  const globalPinnedThreadIds = useMemo(
+    () => globalPinnedThreads.map((thread) => thread.id),
+    [globalPinnedThreads],
+  );
   const sortedProjects = useMemo(
     () =>
       sortProjectsForSidebar(sidebarProjects, visibleThreads, appSettings.sidebarProjectSortOrder),
@@ -1169,30 +1252,17 @@ export default function Sidebar() {
   const renderedProjects = useMemo(
     () =>
       sortedProjects.map((project) => {
-        const projectThreads = sortThreadsForSidebar(
+        const allProjectThreads = sortThreadsForSidebar(
           visibleThreads.filter((thread) => thread.projectId === project.id),
           appSettings.sidebarThreadSortOrder,
         );
-        const threadStatuses = new Map(
-          projectThreads.map((thread) => [
-            thread.id,
-            resolveThreadStatusPill({
-              thread,
-              hasPendingApprovals: derivePendingApprovals(thread.activities).length > 0,
-              hasPendingUserInput: derivePendingUserInputs(thread.activities).length > 0,
-            }),
-          ]),
-        );
+        const projectThreads = allProjectThreads.filter((thread) => thread.pinnedAt === null);
         const projectStatus = resolveProjectStatusIndicator(
-          projectThreads.map((thread) => threadStatuses.get(thread.id) ?? null),
+          allProjectThreads.map((thread) => threadStatusById.get(thread.id) ?? null),
         );
         const activeThreadId = routeThreadId ?? undefined;
         const isThreadListExpanded = expandedThreadListsByProject.has(project.id);
-        const pinnedCollapsedThread =
-          !project.expanded && activeThreadId
-            ? (projectThreads.find((thread) => thread.id === activeThreadId) ?? null)
-            : null;
-        const shouldShowThreadPanel = project.expanded || pinnedCollapsedThread !== null;
+        const shouldShowThreadPanel = project.expanded;
         const {
           hasHiddenThreads,
           hiddenThreads,
@@ -1204,13 +1274,11 @@ export default function Sidebar() {
           previewLimit: THREAD_PREVIEW_LIMIT,
         });
         const hiddenThreadStatus = resolveProjectStatusIndicator(
-          hiddenThreads.map((thread) => threadStatuses.get(thread.id) ?? null),
+          hiddenThreads.map((thread) => threadStatusById.get(thread.id) ?? null),
         );
         const orderedProjectThreadIds = projectThreads.map((thread) => thread.id);
-        const renderedThreads = pinnedCollapsedThread
-          ? [pinnedCollapsedThread]
-          : visibleProjectThreads;
-        const showEmptyThreadState = project.expanded && projectThreads.length === 0;
+        const renderedThreads = visibleProjectThreads;
+        const showEmptyThreadState = project.expanded && allProjectThreads.length === 0;
 
         return {
           hasHiddenThreads,
@@ -1218,8 +1286,6 @@ export default function Sidebar() {
           orderedProjectThreadIds,
           project,
           projectStatus,
-          projectThreads,
-          threadStatuses,
           renderedThreads,
           showEmptyThreadState,
           shouldShowThreadPanel,
@@ -1231,12 +1297,13 @@ export default function Sidebar() {
       expandedThreadListsByProject,
       routeThreadId,
       sortedProjects,
+      threadStatusById,
       visibleThreads,
     ],
   );
   const visibleSidebarThreadIds = useMemo(
-    () => getVisibleSidebarThreadIds(renderedProjects),
-    [renderedProjects],
+    () => [...globalPinnedThreadIds, ...getVisibleSidebarThreadIds(renderedProjects)],
+    [globalPinnedThreadIds, renderedProjects],
   );
   const threadJumpCommandById = useMemo(() => {
     const mapping = new Map<ThreadId, NonNullable<ReturnType<typeof threadJumpCommandForIndex>>>();
@@ -1353,272 +1420,273 @@ export default function Sidebar() {
     updateThreadJumpHintsVisibility,
   ]);
 
-  function renderProjectItem(
-    renderedProject: (typeof renderedProjects)[number],
-    dragHandleProps: SortableProjectHandleProps | null,
-  ) {
-    const {
-      hasHiddenThreads,
-      hiddenThreadStatus,
-      orderedProjectThreadIds,
-      project,
-      projectStatus,
-      projectThreads,
-      threadStatuses,
-      renderedThreads,
-      showEmptyThreadState,
-      shouldShowThreadPanel,
-      isThreadListExpanded,
-    } = renderedProject;
-    const renderThreadRow = (thread: (typeof projectThreads)[number]) => {
-      const isActive = routeThreadId === thread.id;
-      const isSelected = selectedThreadIds.has(thread.id);
-      const isHighlighted = isActive || isSelected;
-      const jumpLabel = threadJumpLabelById.get(thread.id) ?? null;
-      const isThreadRunning =
-        thread.session?.status === "running" && thread.session.activeTurnId != null;
-      const threadStatus = threadStatuses.get(thread.id) ?? null;
-      const prStatus = prStatusIndicator(prByThreadId.get(thread.id) ?? null);
-      const terminalStatus = terminalStatusFromRunningIds(
-        selectThreadTerminalState(terminalStateByThreadId, thread.id).runningTerminalIds,
-      );
-      const isConfirmingArchive = confirmingArchiveThreadId === thread.id && !isThreadRunning;
-      const threadMetaClassName = isConfirmingArchive
-        ? "pointer-events-none opacity-0"
-        : !isThreadRunning
-          ? "pointer-events-none transition-opacity duration-150 group-hover/menu-sub-item:opacity-0 group-focus-within/menu-sub-item:opacity-0"
-          : "pointer-events-none";
-
-      return (
-        <SidebarMenuSubItem
-          key={thread.id}
-          className="w-full"
-          data-thread-item
-          onMouseLeave={() => {
+  const renderThreadRow = (
+    thread: SidebarThreadSnapshot,
+    options: {
+      leadingVisual?: "project-favicon";
+      orderedThreadIds: readonly ThreadId[];
+    },
+  ) => {
+    const isActive = routeThreadId === thread.id;
+    const isSelected = selectedThreadIds.has(thread.id);
+    const isHighlighted = isActive || isSelected;
+    const jumpLabel = threadJumpLabelById.get(thread.id) ?? null;
+    const isThreadRunning =
+      thread.session?.status === "running" && thread.session.activeTurnId != null;
+    const threadStatus = threadStatusById.get(thread.id) ?? null;
+    const prStatus = prStatusIndicator(prByThreadId.get(thread.id) ?? null);
+    const terminalStatus = terminalStatusFromRunningIds(
+      selectThreadTerminalState(terminalStateByThreadId, thread.id).runningTerminalIds,
+    );
+    const isConfirmingArchive = confirmingArchiveThreadId === thread.id && !isThreadRunning;
+    const threadMetaClassName = isConfirmingArchive
+      ? "pointer-events-none opacity-0"
+      : !isThreadRunning
+        ? "pointer-events-none transition-opacity duration-150 group-hover/menu-sub-item:opacity-0 group-focus-within/menu-sub-item:opacity-0"
+        : "pointer-events-none";
+    const hoverActionClassName =
+      "inline-flex size-5 cursor-pointer items-center justify-center text-muted-foreground transition-colors hover:text-foreground focus-visible:outline-hidden focus-visible:ring-1 focus-visible:ring-ring";
+    const hoverActionGroupClassName =
+      "pointer-events-none absolute top-1/2 right-1 flex -translate-y-1/2 items-center gap-0.5 opacity-0 transition-opacity duration-150 group-hover/menu-sub-item:pointer-events-auto group-hover/menu-sub-item:opacity-100 group-focus-within/menu-sub-item:pointer-events-auto group-focus-within/menu-sub-item:opacity-100";
+    const projectCwd = projectCwdById.get(thread.projectId);
+
+    return (
+      <SidebarMenuSubItem
+        key={thread.id}
+        className="w-full"
+        data-thread-item
+        onMouseLeave={() => {
+          setConfirmingArchiveThreadId((current) => (current === thread.id ? null : current));
+        }}
+        onBlurCapture={(event) => {
+          const currentTarget = event.currentTarget;
+          requestAnimationFrame(() => {
+            if (currentTarget.contains(document.activeElement)) {
+              return;
+            }
             setConfirmingArchiveThreadId((current) => (current === thread.id ? null : current));
+          });
+        }}
+      >
+        <SidebarMenuSubButton
+          render={<div role="button" tabIndex={0} />}
+          size="sm"
+          isActive={isActive}
+          data-testid={`thread-row-${thread.id}`}
+          className={`${resolveThreadRowClassName({
+            isActive,
+            isSelected,
+          })} relative isolate`}
+          onClick={(event) => {
+            handleThreadClick(event, thread.id, options.orderedThreadIds);
+          }}
+          onKeyDown={(event) => {
+            if (event.key !== "Enter" && event.key !== " ") return;
+            event.preventDefault();
+            navigateToThread(thread.id);
           }}
-          onBlurCapture={(event) => {
-            const currentTarget = event.currentTarget;
-            requestAnimationFrame(() => {
-              if (currentTarget.contains(document.activeElement)) {
-                return;
+          onContextMenu={(event) => {
+            event.preventDefault();
+            if (selectedThreadIds.size > 0 && selectedThreadIds.has(thread.id)) {
+              void handleMultiSelectContextMenu({
+                x: event.clientX,
+                y: event.clientY,
+              });
+            } else {
+              if (selectedThreadIds.size > 0) {
+                clearSelection();
               }
-              setConfirmingArchiveThreadId((current) => (current === thread.id ? null : current));
-            });
+              void handleThreadContextMenu(thread.id, {
+                x: event.clientX,
+                y: event.clientY,
+              });
+            }
           }}
         >
-          <SidebarMenuSubButton
-            render={<div role="button" tabIndex={0} />}
-            size="sm"
-            isActive={isActive}
-            data-testid={`thread-row-${thread.id}`}
-            className={`${resolveThreadRowClassName({
-              isActive,
-              isSelected,
-            })} relative isolate`}
-            onClick={(event) => {
-              handleThreadClick(event, thread.id, orderedProjectThreadIds);
-            }}
-            onKeyDown={(event) => {
-              if (event.key !== "Enter" && event.key !== " ") return;
-              event.preventDefault();
-              navigateToThread(thread.id);
-            }}
-            onContextMenu={(event) => {
-              event.preventDefault();
-              if (selectedThreadIds.size > 0 && selectedThreadIds.has(thread.id)) {
-                void handleMultiSelectContextMenu({
-                  x: event.clientX,
-                  y: event.clientY,
-                });
-              } else {
-                if (selectedThreadIds.size > 0) {
-                  clearSelection();
-                }
-                void handleThreadContextMenu(thread.id, {
-                  x: event.clientX,
-                  y: event.clientY,
-                });
-              }
-            }}
-          >
-            <div className="flex min-w-0 flex-1 items-center gap-1.5 text-left">
-              {prStatus && (
-                <Tooltip>
-                  <TooltipTrigger
-                    render={
-                      <button
-                        type="button"
-                        aria-label={prStatus.tooltip}
-                        className={`inline-flex items-center justify-center ${prStatus.colorClass} cursor-pointer rounded-sm outline-hidden focus-visible:ring-1 focus-visible:ring-ring`}
-                        onClick={(event) => {
-                          openPrLink(event, prStatus.url);
-                        }}
-                      >
-                        <GitPullRequestIcon className="size-3" />
-                      </button>
-                    }
-                  />
-                  <TooltipPopup side="top">{prStatus.tooltip}</TooltipPopup>
-                </Tooltip>
-              )}
-              {threadStatus && <ThreadStatusLabel status={threadStatus} />}
-              {renamingThreadId === thread.id ? (
-                <input
-                  ref={(el) => {
-                    if (el && renamingInputRef.current !== el) {
-                      renamingInputRef.current = el;
-                      el.focus();
-                      el.select();
+          <div className="flex min-w-0 flex-1 items-center gap-1.5 text-left">
+            {options.leadingVisual === "project-favicon" ? (
+              projectCwd ? (
+                <ProjectFavicon cwd={projectCwd} />
+              ) : (
+                <FolderIcon className="size-3.5 shrink-0 text-muted-foreground/50" />
+              )
+            ) : null}
+            {prStatus && (
+              <Tooltip>
+                <TooltipTrigger
+                  render={
+                    <button
+                      type="button"
+                      aria-label={prStatus.tooltip}
+                      className={`inline-flex items-center justify-center ${prStatus.colorClass} cursor-pointer rounded-sm outline-hidden focus-visible:ring-1 focus-visible:ring-ring`}
+                      onClick={(event) => {
+                        openPrLink(event, prStatus.url);
+                      }}
+                    >
+                      <GitPullRequestIcon className="size-3" />
+                    </button>
+                  }
+                />
+                <TooltipPopup side="top">{prStatus.tooltip}</TooltipPopup>
+              </Tooltip>
+            )}
+            {threadStatus && <ThreadStatusLabel status={threadStatus} />}
+            {renamingThreadId === thread.id ? (
+              <input
+                ref={(el) => {
+                  if (el && renamingInputRef.current !== el) {
+                    renamingInputRef.current = el;
+                    el.focus();
+                    el.select();
+                  }
+                }}
+                className="min-w-0 flex-1 truncate text-xs bg-transparent outline-none border border-ring rounded px-0.5"
+                value={renamingTitle}
+                onChange={(e) => setRenamingTitle(e.target.value)}
+                onKeyDown={(e) => {
+                  e.stopPropagation();
+                  if (e.key === "Enter") {
+                    e.preventDefault();
+                    renamingCommittedRef.current = true;
+                    void commitRename(thread.id, renamingTitle, thread.title);
+                  } else if (e.key === "Escape") {
+                    e.preventDefault();
+                    renamingCommittedRef.current = true;
+                    cancelRename();
+                  }
+                }}
+                onBlur={() => {
+                  if (!renamingCommittedRef.current) {
+                    void commitRename(thread.id, renamingTitle, thread.title);
+                  }
+                }}
+                onClick={(e) => e.stopPropagation()}
+              />
+            ) : (
+              <span className="min-w-0 flex-1 truncate text-xs">{thread.title}</span>
+            )}
+          </div>
+          <div className="ml-auto flex shrink-0 items-center gap-1.5">
+            {terminalStatus && (
+              <span
+                role="img"
+                aria-label={terminalStatus.label}
+                title={terminalStatus.label}
+                className={`inline-flex items-center justify-center ${terminalStatus.colorClass}`}
+              >
+                <TerminalIcon className={`size-3 ${terminalStatus.pulse ? "animate-pulse" : ""}`} />
+              </span>
+            )}
+            <div className="flex min-w-12 justify-end">
+              {isConfirmingArchive ? (
+                <button
+                  ref={(element) => {
+                    if (element) {
+                      confirmArchiveButtonRefs.current.set(thread.id, element);
+                    } else {
+                      confirmArchiveButtonRefs.current.delete(thread.id);
                     }
                   }}
-                  className="min-w-0 flex-1 truncate text-xs bg-transparent outline-none border border-ring rounded px-0.5"
-                  value={renamingTitle}
-                  onChange={(e) => setRenamingTitle(e.target.value)}
-                  onKeyDown={(e) => {
-                    e.stopPropagation();
-                    if (e.key === "Enter") {
-                      e.preventDefault();
-                      renamingCommittedRef.current = true;
-                      void commitRename(thread.id, renamingTitle, thread.title);
-                    } else if (e.key === "Escape") {
-                      e.preventDefault();
-                      renamingCommittedRef.current = true;
-                      cancelRename();
-                    }
+                  type="button"
+                  data-thread-selection-safe
+                  data-testid={`thread-archive-confirm-${thread.id}`}
+                  aria-label={`Confirm archive ${thread.title}`}
+                  className="absolute top-1/2 right-1 inline-flex h-5 -translate-y-1/2 cursor-pointer items-center rounded-full bg-destructive/12 px-2 text-[10px] font-medium text-destructive transition-colors hover:bg-destructive/18 focus-visible:outline-hidden focus-visible:ring-1 focus-visible:ring-destructive/40"
+                  onPointerDown={(event) => {
+                    event.stopPropagation();
                   }}
-                  onBlur={() => {
-                    if (!renamingCommittedRef.current) {
-                      void commitRename(thread.id, renamingTitle, thread.title);
-                    }
+                  onClick={(event) => {
+                    event.preventDefault();
+                    event.stopPropagation();
+                    setConfirmingArchiveThreadId((current) =>
+                      current === thread.id ? null : current,
+                    );
+                    void attemptArchiveThread(thread.id);
                   }}
-                  onClick={(e) => e.stopPropagation()}
-                />
-              ) : (
-                <span className="min-w-0 flex-1 truncate text-xs">{thread.title}</span>
-              )}
-            </div>
-            <div className="ml-auto flex shrink-0 items-center gap-1.5">
-              {terminalStatus && (
-                <span
-                  role="img"
-                  aria-label={terminalStatus.label}
-                  title={terminalStatus.label}
-                  className={`inline-flex items-center justify-center ${terminalStatus.colorClass}`}
                 >
-                  <TerminalIcon
-                    className={`size-3 ${terminalStatus.pulse ? "animate-pulse" : ""}`}
-                  />
-                </span>
-              )}
-              <div className="flex min-w-12 justify-end">
-                {isConfirmingArchive ? (
-                  <button
-                    ref={(element) => {
-                      if (element) {
-                        confirmArchiveButtonRefs.current.set(thread.id, element);
-                      } else {
-                        confirmArchiveButtonRefs.current.delete(thread.id);
-                      }
-                    }}
-                    type="button"
-                    data-thread-selection-safe
-                    data-testid={`thread-archive-confirm-${thread.id}`}
-                    aria-label={`Confirm archive ${thread.title}`}
-                    className="absolute top-1/2 right-1 inline-flex h-5 -translate-y-1/2 cursor-pointer items-center rounded-full bg-destructive/12 px-2 text-[10px] font-medium text-destructive transition-colors hover:bg-destructive/18 focus-visible:outline-hidden focus-visible:ring-1 focus-visible:ring-destructive/40"
-                    onPointerDown={(event) => {
-                      event.stopPropagation();
-                    }}
-                    onClick={(event) => {
-                      event.preventDefault();
-                      event.stopPropagation();
-                      setConfirmingArchiveThreadId((current) =>
-                        current === thread.id ? null : current,
-                      );
-                      void attemptArchiveThread(thread.id);
-                    }}
-                  >
-                    Confirm
-                  </button>
-                ) : !isThreadRunning ? (
-                  appSettings.confirmThreadArchive ? (
-                    <div className="pointer-events-none absolute top-1/2 right-1 -translate-y-1/2 opacity-0 transition-opacity duration-150 group-hover/menu-sub-item:pointer-events-auto group-hover/menu-sub-item:opacity-100 group-focus-within/menu-sub-item:pointer-events-auto group-focus-within/menu-sub-item:opacity-100">
-                      <button
-                        type="button"
-                        data-thread-selection-safe
-                        data-testid={`thread-archive-${thread.id}`}
-                        aria-label={`Archive ${thread.title}`}
-                        className="inline-flex size-5 cursor-pointer items-center justify-center text-muted-foreground transition-colors hover:text-foreground focus-visible:outline-hidden focus-visible:ring-1 focus-visible:ring-ring"
-                        onPointerDown={(event) => {
-                          event.stopPropagation();
-                        }}
-                        onClick={(event) => {
-                          event.preventDefault();
-                          event.stopPropagation();
-                          setConfirmingArchiveThreadId(thread.id);
-                          requestAnimationFrame(() => {
-                            confirmArchiveButtonRefs.current.get(thread.id)?.focus();
-                          });
-                        }}
-                      >
-                        <ArchiveIcon className="size-3.5" />
-                      </button>
-                    </div>
-                  ) : (
+                  Confirm
+                </button>
+              ) : null}
+              {!isConfirmingArchive ? (
+                <div className={hoverActionGroupClassName}>
+                  {!isThreadRunning ? (
                     <Tooltip>
                       <TooltipTrigger
                         render={
-                          <div className="pointer-events-none absolute top-1/2 right-1 -translate-y-1/2 opacity-0 transition-opacity duration-150 group-hover/menu-sub-item:pointer-events-auto group-hover/menu-sub-item:opacity-100 group-focus-within/menu-sub-item:pointer-events-auto group-focus-within/menu-sub-item:opacity-100">
-                            <button
-                              type="button"
-                              data-thread-selection-safe
-                              data-testid={`thread-archive-${thread.id}`}
-                              aria-label={`Archive ${thread.title}`}
-                              className="inline-flex size-5 cursor-pointer items-center justify-center text-muted-foreground transition-colors hover:text-foreground focus-visible:outline-hidden focus-visible:ring-1 focus-visible:ring-ring"
-                              onPointerDown={(event) => {
-                                event.stopPropagation();
-                              }}
-                              onClick={(event) => {
-                                event.preventDefault();
-                                event.stopPropagation();
-                                void attemptArchiveThread(thread.id);
-                              }}
-                            >
-                              <ArchiveIcon className="size-3.5" />
-                            </button>
-                          </div>
+                          <button
+                            type="button"
+                            data-thread-selection-safe
+                            data-testid={`thread-archive-${thread.id}`}
+                            aria-label={`Archive ${thread.title}`}
+                            className={hoverActionClassName}
+                            onPointerDown={(event) => {
+                              event.preventDefault();
+                              event.stopPropagation();
+                            }}
+                            onClick={(event) => {
+                              event.preventDefault();
+                              event.stopPropagation();
+                              if (appSettings.confirmThreadArchive) {
+                                setConfirmingArchiveThreadId(thread.id);
+                                requestAnimationFrame(() => {
+                                  confirmArchiveButtonRefs.current.get(thread.id)?.focus();
+                                });
+                                return;
+                              }
+                              void attemptArchiveThread(thread.id);
+                            }}
+                          >
+                            <ArchiveIcon className="size-3.5" />
+                          </button>
                         }
                       />
                       <TooltipPopup side="top">Archive</TooltipPopup>
                     </Tooltip>
-                  )
-                ) : null}
-                <span className={threadMetaClassName}>
-                  {showThreadJumpHints && jumpLabel ? (
-                    <span
-                      className="inline-flex h-5 items-center rounded-full border border-border/80 bg-background/90 px-1.5 font-mono text-[10px] font-medium tracking-tight text-foreground shadow-sm"
-                      title={jumpLabel}
-                    >
-                      {jumpLabel}
-                    </span>
-                  ) : (
-                    <span
-                      className={`text-[10px] ${
-                        isHighlighted
-                          ? "text-foreground/72 dark:text-foreground/82"
-                          : "text-muted-foreground/40"
-                      }`}
-                    >
-                      {formatRelativeTimeLabel(thread.updatedAt ?? thread.createdAt)}
-                    </span>
-                  )}
-                </span>
-              </div>
+                  ) : null}
+                </div>
+              ) : null}
+              <span className={threadMetaClassName}>
+                {showThreadJumpHints && jumpLabel ? (
+                  <span
+                    className="inline-flex h-5 items-center rounded-full border border-border/80 bg-background/90 px-1.5 font-mono text-[10px] font-medium tracking-tight text-foreground shadow-sm"
+                    title={jumpLabel}
+                  >
+                    {jumpLabel}
+                  </span>
+                ) : (
+                  <span
+                    className={`text-[10px] ${
+                      isHighlighted
+                        ? "text-foreground/72 dark:text-foreground/82"
+                        : "text-muted-foreground/40"
+                    }`}
+                  >
+                    {formatRelativeTimeLabel(thread.updatedAt ?? thread.createdAt)}
+                  </span>
+                )}
+              </span>
             </div>
-          </SidebarMenuSubButton>
-        </SidebarMenuSubItem>
-      );
-    };
+          </div>
+        </SidebarMenuSubButton>
+      </SidebarMenuSubItem>
+    );
+  };
+
+  function renderProjectItem(
+    renderedProject: (typeof renderedProjects)[number],
+    dragHandleProps: SortableProjectHandleProps | null,
+  ) {
+    const {
+      hasHiddenThreads,
+      hiddenThreadStatus,
+      orderedProjectThreadIds,
+      project,
+      projectStatus,
+      renderedThreads,
+      showEmptyThreadState,
+      shouldShowThreadPanel,
+      isThreadListExpanded,
+    } = renderedProject;
 
     return (
       <>
@@ -1670,6 +1738,15 @@ export default function Sidebar() {
               {project.name}
             </span>
           </SidebarMenuButton>
+          {project.pinnedAt !== null ? (
+            <span
+              aria-hidden="true"
+              title="Pinned project"
+              className="pointer-events-none absolute top-1 right-1.5 inline-flex size-5 items-center justify-center text-muted-foreground/65 transition-opacity duration-150 group-hover/menu-item:opacity-0 group-focus-within/menu-item:opacity-0"
+            >
+              <PinIcon className="size-3.5" />
+            </span>
+          ) : null}
           <Tooltip>
             <TooltipTrigger
               render={
@@ -1683,6 +1760,10 @@ export default function Sidebar() {
                   }
                   showOnHover
                   className="top-1 right-1.5 size-5 rounded-md p-0 text-muted-foreground/70 hover:bg-secondary hover:text-foreground"
+                  onPointerDown={(event) => {
+                    event.preventDefault();
+                    event.stopPropagation();
+                  }}
                   onClick={(event) => {
                     event.preventDefault();
                     event.stopPropagation();
@@ -1717,7 +1798,10 @@ export default function Sidebar() {
               </div>
             </SidebarMenuSubItem>
           ) : null}
-          {shouldShowThreadPanel && renderedThreads.map((thread) => renderThreadRow(thread))}
+          {shouldShowThreadPanel &&
+            renderedThreads.map((thread) =>
+              renderThreadRow(thread, { orderedThreadIds: orderedProjectThreadIds }),
+            )}
 
           {project.expanded && hasHiddenThreads && !isThreadListExpanded && (
             <SidebarMenuSubItem className="w-full">
@@ -2002,6 +2086,21 @@ export default function Sidebar() {
                 </Alert>
               </SidebarGroup>
             ) : null}
+            {globalPinnedThreads.length > 0 ? (
+              <SidebarGroup className="px-2 pt-2 pb-0">
+                <SidebarMenuSub
+                  ref={attachThreadListAutoAnimateRef}
+                  className="mx-0 w-full translate-x-0 gap-0.5 border-l-0 px-0 py-0"
+                >
+                  {globalPinnedThreads.map((thread) =>
+                    renderThreadRow(thread, {
+                      leadingVisual: "project-favicon",
+                      orderedThreadIds: globalPinnedThreadIds,
+                    }),
+                  )}
+                </SidebarMenuSub>
+              </SidebarGroup>
+            ) : null}
             <SidebarGroup className="px-2 py-2">
               <div className="mb-1 flex items-center justify-between pl-2 pr-1.5">
                 <span className="text-[10px] font-medium uppercase tracking-wider text-muted-foreground/60">
diff --git a/apps/web/src/orchestrationEventEffects.test.ts b/apps/web/src/orchestrationEventEffects.test.ts
index 263610bb95..e43f61f7a0 100644
--- a/apps/web/src/orchestrationEventEffects.test.ts
+++ b/apps/web/src/orchestrationEventEffects.test.ts
@@ -48,6 +48,7 @@ describe("deriveOrchestrationBatchEffects", () => {
         threadId: createdThreadId,
         projectId: ProjectId.makeUnsafe("project-1"),
         title: "Created thread",
+        pinnedAt: null,
         modelSelection: { provider: "codex", model: "gpt-5-codex" },
         runtimeMode: "full-access",
         interactionMode: "default",
@@ -80,6 +81,7 @@ describe("deriveOrchestrationBatchEffects", () => {
         threadId,
         projectId: ProjectId.makeUnsafe("project-1"),
         title: "Recreated thread",
+        pinnedAt: null,
         modelSelection: { provider: "codex", model: "gpt-5-codex" },
         runtimeMode: "full-access",
         interactionMode: "default",
diff --git a/apps/web/src/store.test.ts b/apps/web/src/store.test.ts
index 6e909b38f0..bbfa9caaf8 100644
--- a/apps/web/src/store.test.ts
+++ b/apps/web/src/store.test.ts
@@ -25,6 +25,7 @@ function makeThread(overrides: Partial<Thread> = {}): Thread {
     codexThreadId: null,
     projectId: ProjectId.makeUnsafe("project-1"),
     title: "Thread",
+    pinnedAt: null,
     modelSelection: {
       provider: "codex",
       model: "gpt-5-codex",
@@ -53,6 +54,7 @@ function makeState(thread: Thread): AppState {
         id: ProjectId.makeUnsafe("project-1"),
         name: "Project",
         cwd: "/tmp/project",
+        pinnedAt: null,
         defaultModelSelection: {
           provider: "codex",
           model: "gpt-5-codex",
@@ -97,6 +99,7 @@ function makeReadModelThread(overrides: Partial<OrchestrationReadModel["threads"
     id: ThreadId.makeUnsafe("thread-1"),
     projectId: ProjectId.makeUnsafe("project-1"),
     title: "Thread",
+    pinnedAt: null,
     modelSelection: {
       provider: "codex",
       model: "gpt-5.3-codex",
@@ -128,6 +131,7 @@ function makeReadModel(thread: OrchestrationReadModel["threads"][number]): Orche
         id: ProjectId.makeUnsafe("project-1"),
         title: "Project",
         workspaceRoot: "/tmp/project",
+        pinnedAt: null,
         defaultModelSelection: {
           provider: "codex",
           model: "gpt-5.3-codex",
@@ -149,6 +153,7 @@ function makeReadModelProject(
     id: ProjectId.makeUnsafe("project-1"),
     title: "Project",
     workspaceRoot: "/tmp/project",
+    pinnedAt: null,
     defaultModelSelection: {
       provider: "codex",
       model: "gpt-5.3-codex",
@@ -253,6 +258,7 @@ describe("store read model sync", () => {
           id: project2,
           name: "Project 2",
           cwd: "/tmp/project-2",
+          pinnedAt: null,
           defaultModelSelection: {
             provider: "codex",
             model: DEFAULT_MODEL_BY_PROVIDER.codex,
@@ -263,6 +269,7 @@ describe("store read model sync", () => {
           id: project1,
           name: "Project 1",
           cwd: "/tmp/project-1",
+          pinnedAt: null,
           defaultModelSelection: {
             provider: "codex",
             model: DEFAULT_MODEL_BY_PROVIDER.codex,
@@ -353,6 +360,7 @@ describe("incremental orchestration updates", () => {
           id: originalProjectId,
           name: "Project",
           cwd: "/tmp/project",
+          pinnedAt: null,
           defaultModelSelection: {
             provider: "codex",
             model: DEFAULT_MODEL_BY_PROVIDER.codex,
@@ -370,6 +378,7 @@ describe("incremental orchestration updates", () => {
         projectId: recreatedProjectId,
         title: "Project Recreated",
         workspaceRoot: "/tmp/project",
+        pinnedAt: null,
         defaultModelSelection: {
           provider: "codex",
           model: DEFAULT_MODEL_BY_PROVIDER.codex,
diff --git a/apps/web/src/store.ts b/apps/web/src/store.ts
index eff6a6fd07..f7003eb3b2 100644
--- a/apps/web/src/store.ts
+++ b/apps/web/src/store.ts
@@ -147,6 +147,7 @@ function mapThread(thread: OrchestrationThread): Thread {
     codexThreadId: null,
     projectId: thread.projectId,
     title: thread.title,
+    pinnedAt: thread.pinnedAt,
     modelSelection: normalizeModelSelection(thread.modelSelection),
     runtimeMode: thread.runtimeMode,
     interactionMode: thread.interactionMode,
@@ -171,6 +172,7 @@ function mapProject(project: OrchestrationReadModel["projects"][number]): Projec
     id: project.id,
     name: project.title,
     cwd: project.workspaceRoot,
+    pinnedAt: project.pinnedAt,
     defaultModelSelection: project.defaultModelSelection
       ? normalizeModelSelection(project.defaultModelSelection)
       : null,
@@ -424,6 +426,7 @@ export function applyOrchestrationEvent(state: AppState, event: OrchestrationEve
         id: event.payload.projectId,
         title: event.payload.title,
         workspaceRoot: event.payload.workspaceRoot,
+        pinnedAt: event.payload.pinnedAt,
         defaultModelSelection: event.payload.defaultModelSelection,
         scripts: event.payload.scripts,
         createdAt: event.payload.createdAt,
@@ -444,6 +447,7 @@ export function applyOrchestrationEvent(state: AppState, event: OrchestrationEve
         ...project,
         ...(event.payload.title !== undefined ? { name: event.payload.title } : {}),
         ...(event.payload.workspaceRoot !== undefined ? { cwd: event.payload.workspaceRoot } : {}),
+        ...(event.payload.pinnedAt !== undefined ? { pinnedAt: event.payload.pinnedAt } : {}),
         ...(event.payload.defaultModelSelection !== undefined
           ? {
               defaultModelSelection: event.payload.defaultModelSelection
@@ -470,6 +474,7 @@ export function applyOrchestrationEvent(state: AppState, event: OrchestrationEve
         id: event.payload.threadId,
         projectId: event.payload.projectId,
         title: event.payload.title,
+        pinnedAt: event.payload.pinnedAt,
         modelSelection: event.payload.modelSelection,
         runtimeMode: event.payload.runtimeMode,
         interactionMode: event.payload.interactionMode,
@@ -519,6 +524,7 @@ export function applyOrchestrationEvent(state: AppState, event: OrchestrationEve
       const threads = updateThread(state.threads, event.payload.threadId, (thread) => ({
         ...thread,
         ...(event.payload.title !== undefined ? { title: event.payload.title } : {}),
+        ...(event.payload.pinnedAt !== undefined ? { pinnedAt: event.payload.pinnedAt } : {}),
         ...(event.payload.modelSelection !== undefined
           ? { modelSelection: normalizeModelSelection(event.payload.modelSelection) }
           : {}),
diff --git a/apps/web/src/types.ts b/apps/web/src/types.ts
index 0ebf150310..f089a46f60 100644
--- a/apps/web/src/types.ts
+++ b/apps/web/src/types.ts
@@ -82,6 +82,7 @@ export interface Project {
   id: ProjectId;
   name: string;
   cwd: string;
+  pinnedAt: string | null;
   defaultModelSelection: ModelSelection | null;
   createdAt?: string | undefined;
   updatedAt?: string | undefined;
@@ -93,6 +94,7 @@ export interface Thread {
   codexThreadId: string | null;
   projectId: ProjectId;
   title: string;
+  pinnedAt: string | null;
   modelSelection: ModelSelection;
   runtimeMode: RuntimeMode;
   interactionMode: ProviderInteractionMode;
diff --git a/apps/web/src/worktreeCleanup.test.ts b/apps/web/src/worktreeCleanup.test.ts
index 723661ccbb..ac8370dccd 100644
--- a/apps/web/src/worktreeCleanup.test.ts
+++ b/apps/web/src/worktreeCleanup.test.ts
@@ -10,6 +10,7 @@ function makeThread(overrides: Partial<Thread> = {}): Thread {
     codexThreadId: null,
     projectId: ProjectId.makeUnsafe("project-1"),
     title: "Thread",
+    pinnedAt: null,
     modelSelection: {
       provider: "codex",
       model: "gpt-5.3-codex",
diff --git a/apps/web/src/wsNativeApi.test.ts b/apps/web/src/wsNativeApi.test.ts
index be53eefd9b..dafaff2e23 100644
--- a/apps/web/src/wsNativeApi.test.ts
+++ b/apps/web/src/wsNativeApi.test.ts
@@ -289,6 +289,7 @@ describe("wsNativeApi", () => {
         projectId: ProjectId.makeUnsafe("project-1"),
         title: "Project",
         workspaceRoot: "/tmp/workspace",
+        pinnedAt: null,
         defaultModelSelection: null,
         scripts: [],
         createdAt: "2026-02-24T00:00:00.000Z",
@@ -331,6 +332,7 @@ describe("wsNativeApi", () => {
       projectId: ProjectId.makeUnsafe("project-1"),
       title: "Project",
       workspaceRoot: "/tmp/project",
+      pinned: false,
       defaultModelSelection: {
         provider: "codex",
         model: "gpt-5-codex",
diff --git a/packages/contracts/src/orchestration.test.ts b/packages/contracts/src/orchestration.test.ts
index 06bb35038d..4ac287f2fd 100644
--- a/packages/contracts/src/orchestration.test.ts
+++ b/packages/contracts/src/orchestration.test.ts
@@ -95,6 +95,7 @@ it.effect("trims branded ids and command string fields at decode boundaries", ()
     assert.strictEqual(parsed.projectId, "project-1");
     assert.strictEqual(parsed.title, "Project Title");
     assert.strictEqual(parsed.workspaceRoot, "/tmp/workspace");
+    assert.strictEqual(parsed.pinned, false);
     assert.deepStrictEqual(parsed.defaultModelSelection, {
       provider: "codex",
       model: "gpt-5.2",
@@ -117,6 +118,7 @@ it.effect("decodes historical project.created payloads with a default provider",
       updatedAt: "2026-01-01T00:00:00.000Z",
     });
     assert.strictEqual(parsed.defaultModelSelection?.provider, "codex");
+    assert.strictEqual(parsed.pinnedAt, null);
   }),
 );
 
@@ -214,6 +216,7 @@ it.effect("decodes thread.created runtime mode for historical events", () =>
 
     assert.strictEqual(parsed.runtimeMode, DEFAULT_RUNTIME_MODE);
     assert.strictEqual(parsed.modelSelection.provider, "codex");
+    assert.strictEqual(parsed.pinnedAt, null);
   }),
 );
 
diff --git a/packages/contracts/src/orchestration.ts b/packages/contracts/src/orchestration.ts
index a780a55c78..cb28011c3d 100644
--- a/packages/contracts/src/orchestration.ts
+++ b/packages/contracts/src/orchestration.ts
@@ -145,6 +145,7 @@ export const OrchestrationProject = Schema.Struct({
   id: ProjectId,
   title: TrimmedNonEmptyString,
   workspaceRoot: TrimmedNonEmptyString,
+  pinnedAt: Schema.NullOr(IsoDateTime).pipe(Schema.withDecodingDefault(() => null)),
   defaultModelSelection: Schema.NullOr(ModelSelection),
   scripts: Schema.Array(ProjectScript),
   createdAt: IsoDateTime,
@@ -274,6 +275,7 @@ export const OrchestrationThread = Schema.Struct({
   id: ThreadId,
   projectId: ProjectId,
   title: TrimmedNonEmptyString,
+  pinnedAt: Schema.NullOr(IsoDateTime).pipe(Schema.withDecodingDefault(() => null)),
   modelSelection: ModelSelection,
   runtimeMode: RuntimeMode,
   interactionMode: ProviderInteractionMode.pipe(
@@ -308,6 +310,7 @@ export const ProjectCreateCommand = Schema.Struct({
   projectId: ProjectId,
   title: TrimmedNonEmptyString,
   workspaceRoot: TrimmedNonEmptyString,
+  pinned: Schema.Boolean.pipe(Schema.withDecodingDefault(() => false)),
   defaultModelSelection: Schema.optional(Schema.NullOr(ModelSelection)),
   createdAt: IsoDateTime,
 });
@@ -318,6 +321,7 @@ const ProjectMetaUpdateCommand = Schema.Struct({
   projectId: ProjectId,
   title: Schema.optional(TrimmedNonEmptyString),
   workspaceRoot: Schema.optional(TrimmedNonEmptyString),
+  pinned: Schema.optional(Schema.Boolean),
   defaultModelSelection: Schema.optional(Schema.NullOr(ModelSelection)),
   scripts: Schema.optional(Schema.Array(ProjectScript)),
 });
@@ -334,6 +338,7 @@ const ThreadCreateCommand = Schema.Struct({
   threadId: ThreadId,
   projectId: ProjectId,
   title: TrimmedNonEmptyString,
+  pinned: Schema.Boolean.pipe(Schema.withDecodingDefault(() => false)),
   modelSelection: ModelSelection,
   runtimeMode: RuntimeMode,
   interactionMode: ProviderInteractionMode.pipe(
@@ -367,6 +372,7 @@ const ThreadMetaUpdateCommand = Schema.Struct({
   commandId: CommandId,
   threadId: ThreadId,
   title: Schema.optional(TrimmedNonEmptyString),
+  pinned: Schema.optional(Schema.Boolean),
   modelSelection: Schema.optional(ModelSelection),
   branch: Schema.optional(Schema.NullOr(TrimmedNonEmptyString)),
   worktreePath: Schema.optional(Schema.NullOr(TrimmedNonEmptyString)),
@@ -624,6 +630,7 @@ export const ProjectCreatedPayload = Schema.Struct({
   projectId: ProjectId,
   title: TrimmedNonEmptyString,
   workspaceRoot: TrimmedNonEmptyString,
+  pinnedAt: Schema.NullOr(IsoDateTime).pipe(Schema.withDecodingDefault(() => null)),
   defaultModelSelection: Schema.NullOr(ModelSelection),
   scripts: Schema.Array(ProjectScript),
   createdAt: IsoDateTime,
@@ -634,6 +641,7 @@ export const ProjectMetaUpdatedPayload = Schema.Struct({
   projectId: ProjectId,
   title: Schema.optional(TrimmedNonEmptyString),
   workspaceRoot: Schema.optional(TrimmedNonEmptyString),
+  pinnedAt: Schema.optional(Schema.NullOr(IsoDateTime)),
   defaultModelSelection: Schema.optional(Schema.NullOr(ModelSelection)),
   scripts: Schema.optional(Schema.Array(ProjectScript)),
   updatedAt: IsoDateTime,
@@ -648,6 +656,7 @@ export const ThreadCreatedPayload = Schema.Struct({
   threadId: ThreadId,
   projectId: ProjectId,
   title: TrimmedNonEmptyString,
+  pinnedAt: Schema.NullOr(IsoDateTime).pipe(Schema.withDecodingDefault(() => null)),
   modelSelection: ModelSelection,
   runtimeMode: RuntimeMode.pipe(Schema.withDecodingDefault(() => DEFAULT_RUNTIME_MODE)),
   interactionMode: ProviderInteractionMode.pipe(
@@ -678,6 +687,7 @@ export const ThreadUnarchivedPayload = Schema.Struct({
 export const ThreadMetaUpdatedPayload = Schema.Struct({
   threadId: ThreadId,
   title: Schema.optional(TrimmedNonEmptyString),
+  pinnedAt: Schema.optional(Schema.NullOr(IsoDateTime)),
   modelSelection: Schema.optional(ModelSelection),
   branch: Schema.optional(Schema.NullOr(TrimmedNonEmptyString)),
   worktreePath: Schema.optional(Schema.NullOr(TrimmedNonEmptyString)),