diff --git a/openspec/changes/agent-codex-fix-active-agents-view-container-id-2026-04-25-15-48/.openspec.yaml b/openspec/changes/agent-codex-fix-active-agents-view-container-id-2026-04-25-15-48/.openspec.yaml
new file mode 100644
index 0000000..1b75776
--- /dev/null
+++ b/openspec/changes/agent-codex-fix-active-agents-view-container-id-2026-04-25-15-48/.openspec.yaml
@@ -0,0 +1,2 @@
+schema: spec-driven
+created: 2026-04-25
diff --git a/openspec/changes/agent-codex-fix-active-agents-view-container-id-2026-04-25-15-48/notes.md b/openspec/changes/agent-codex-fix-active-agents-view-container-id-2026-04-25-15-48/notes.md
new file mode 100644
index 0000000..a9b2268
--- /dev/null
+++ b/openspec/changes/agent-codex-fix-active-agents-view-container-id-2026-04-25-15-48/notes.md
@@ -0,0 +1,25 @@
+# agent-codex-fix-active-agents-view-container-id-2026-04-25-15-48 (minimal / T1)
+
+Branch: `agent/codex/fix-active-agents-view-container-id-2026-04-25-15-48`
+
+Fix the VS Code Active Agents view container registration. VS Code rejects contributed activity bar container IDs containing dots, so the companion extension must use an alphanumeric/underscore/hyphen-only container ID while preserving the existing `gitguardex.activeAgents` view ID and commands.
+
+Scope:
+- Update live and template Active Agents manifests to use `gitguardex-active-agents-container`.
+- Update the focus command target to `workbench.view.extension.gitguardex-active-agents-container`.
+- Add regression coverage for the container ID character constraint and focus command target.
+
+Verification:
+- `node --test test/vscode-active-agents-session-state.test.js`
+- Manifest parity check covered by the focused test.
+
+## Handoff
+
+- Handoff: change=`agent-codex-fix-active-agents-view-container-id-2026-04-25-15-48`; branch=`agent/codex/fix-active-agents-view-container-id-2026-04-25-15-48`; scope=`vscode/guardex-active-agents/package.json, templates/vscode/guardex-active-agents/package.json, paired extension.js focus command, test/vscode-active-agents-session-state.test.js`; action=`replace invalid dotted view-container id, verify focused extension test, then finish via PR merge + cleanup`.
+- Copy prompt: Continue `agent-codex-fix-active-agents-view-container-id-2026-04-25-15-48` on branch `agent/codex/fix-active-agents-view-container-id-2026-04-25-15-48`. Work inside the existing sandbox, keep live/template VS Code extension files in sync, and when verification is clean run `gx branch finish --branch agent/codex/fix-active-agents-view-container-id-2026-04-25-15-48 --base main --via-pr --wait-for-merge --cleanup`.
+
+## Cleanup
+
+- [ ] Run: `gx branch finish --branch agent/codex/fix-active-agents-view-container-id-2026-04-25-15-48 --base main --via-pr --wait-for-merge --cleanup`
+- [ ] Record PR URL + `MERGED` state in the completion handoff.
+- [ ] Confirm sandbox worktree is gone (`git worktree list`, `git branch -a`).
diff --git a/templates/vscode/guardex-active-agents/extension.js b/templates/vscode/guardex-active-agents/extension.js
index 1b70667..463dd80 100644
--- a/templates/vscode/guardex-active-agents/extension.js
+++ b/templates/vscode/guardex-active-agents/extension.js
@@ -3587,7 +3587,7 @@ function activate(context) {
     vscode.commands.registerCommand('gitguardex.activeAgents.refresh', refresh),
     vscode.commands.registerCommand('gitguardex.activeAgents.restart', restartActiveAgents),
     vscode.commands.registerCommand('gitguardex.activeAgents.focus', async () => {
-      await vscode.commands.executeCommand('workbench.view.extension.gitguardex.activeAgentsContainer');
+      await vscode.commands.executeCommand('workbench.view.extension.gitguardex-active-agents-container');
     }),
     vscode.commands.registerCommand('gitguardex.activeAgents.commitSelectedSession', commitSelectedSession),
     vscode.commands.registerCommand('gitguardex.activeAgents.openWorktree', async (session) => {
diff --git a/templates/vscode/guardex-active-agents/package.json b/templates/vscode/guardex-active-agents/package.json
index 894cc7d..dcf89ba 100644
--- a/templates/vscode/guardex-active-agents/package.json
+++ b/templates/vscode/guardex-active-agents/package.json
@@ -79,14 +79,14 @@
     "viewsContainers": {
       "activitybar": [
         {
-          "id": "gitguardex.activeAgentsContainer",
+          "id": "gitguardex-active-agents-container",
           "title": "Active Agents",
           "icon": "media/active-agents-hivemind.svg"
         }
       ]
     },
     "views": {
-      "gitguardex.activeAgentsContainer": [
+      "gitguardex-active-agents-container": [
         {
           "id": "gitguardex.activeAgents",
           "name": "Active Agents",
diff --git a/test/vscode-active-agents-session-state.test.js b/test/vscode-active-agents-session-state.test.js
index ff89201..ce990fd 100644
--- a/test/vscode-active-agents-session-state.test.js
+++ b/test/vscode-active-agents-session-state.test.js
@@ -1308,13 +1308,14 @@ test('active-agents manifest uses a dedicated activity bar container with a hive
   const manifest = readExtensionManifest();
   const activitybarContainers = manifest.contributes.viewsContainers?.activitybar || [];
   const activeAgentsContainer = activitybarContainers.find(
-    (entry) => entry.id === 'gitguardex.activeAgentsContainer',
+    (entry) => entry.id === 'gitguardex-active-agents-container',
   );
   assert.ok(activeAgentsContainer, 'Expected the Active Agents activity bar container.');
+  assert.match(activeAgentsContainer.id, /^[A-Za-z0-9_-]+$/);
   assert.equal(activeAgentsContainer.title, 'Active Agents');
   assert.equal(activeAgentsContainer.icon, 'media/active-agents-hivemind.svg');
 
-  const activeAgentsViews = manifest.contributes.views?.['gitguardex.activeAgentsContainer'] || [];
+  const activeAgentsViews = manifest.contributes.views?.['gitguardex-active-agents-container'] || [];
   assert.deepEqual(activeAgentsViews, [
     {
       id: 'gitguardex.activeAgents',
@@ -1540,7 +1541,7 @@ test('active-agents focus command opens the dedicated sidebar container', async
 
   assert.equal(
     registrations.executedCommands.some((entry) => (
-      entry.command === 'workbench.view.extension.gitguardex.activeAgentsContainer'
+      entry.command === 'workbench.view.extension.gitguardex-active-agents-container'
     )),
     true,
   );
diff --git a/vscode/guardex-active-agents/extension.js b/vscode/guardex-active-agents/extension.js
index 1b70667..463dd80 100644
--- a/vscode/guardex-active-agents/extension.js
+++ b/vscode/guardex-active-agents/extension.js
@@ -3587,7 +3587,7 @@ function activate(context) {
     vscode.commands.registerCommand('gitguardex.activeAgents.refresh', refresh),
     vscode.commands.registerCommand('gitguardex.activeAgents.restart', restartActiveAgents),
     vscode.commands.registerCommand('gitguardex.activeAgents.focus', async () => {
-      await vscode.commands.executeCommand('workbench.view.extension.gitguardex.activeAgentsContainer');
+      await vscode.commands.executeCommand('workbench.view.extension.gitguardex-active-agents-container');
     }),
     vscode.commands.registerCommand('gitguardex.activeAgents.commitSelectedSession', commitSelectedSession),
     vscode.commands.registerCommand('gitguardex.activeAgents.openWorktree', async (session) => {
diff --git a/vscode/guardex-active-agents/package.json b/vscode/guardex-active-agents/package.json
index 894cc7d..dcf89ba 100644
--- a/vscode/guardex-active-agents/package.json
+++ b/vscode/guardex-active-agents/package.json
@@ -79,14 +79,14 @@
     "viewsContainers": {
       "activitybar": [
         {
-          "id": "gitguardex.activeAgentsContainer",
+          "id": "gitguardex-active-agents-container",
           "title": "Active Agents",
           "icon": "media/active-agents-hivemind.svg"
         }
       ]
     },
     "views": {
-      "gitguardex.activeAgentsContainer": [
+      "gitguardex-active-agents-container": [
         {
           "id": "gitguardex.activeAgents",
           "name": "Active Agents",