diff --git a/apps/cli/src/command-internal/db-pull-run.ts b/apps/cli/src/command-internal/db-pull-run.ts
index d01b9d1c54..1f92838e7c 100644
--- a/apps/cli/src/command-internal/db-pull-run.ts
+++ b/apps/cli/src/command-internal/db-pull-run.ts
@@ -90,7 +90,7 @@ export type { DbPullFlags };
 
 // Established output contract; ends with a `.`.
 const DEPRECATION_LINE =
-  "Flag --use-pg-delta has been deprecated, use --declarative with [experimental.pgdelta] enabled = true in your config.toml instead.";
+  "Flag --use-pg-delta is deprecated and will be removed in v3, use --declarative with [experimental.pgdelta] enabled = true in your config.toml instead.";
 
 /**
  * Explains the in-sync non-zero exit instead of the generic "Try rerunning the command with
@@ -107,7 +107,7 @@ const MIGRATION_FILE_MODE = 0o644;
 // export covers the same per-object-files outcome. Printed only when the experimental gate
 // selected this branch, not when `--declarative` already did.
 const EXPERIMENTAL_STRUCTURED_DUMP_DEPRECATION_LINE =
-  "The --experimental structured-dump mode for `db pull` is deprecated and will be removed in a future release. Use --declarative instead to pull the remote schema as per-object files.";
+  "The --experimental structured-dump mode for `db pull` is deprecated and will be removed in v3. Use --declarative instead to pull the remote schema as per-object files.";
 
 export type DbPullInvoke = {
   /** Skip printing `Finished supabase db pull.` for callers that must not emit it. */
diff --git a/apps/cli/src/commands/db/pull/SIDE_EFFECTS.md b/apps/cli/src/commands/db/pull/SIDE_EFFECTS.md
index dd5da5ad77..81db74a60e 100644
--- a/apps/cli/src/commands/db/pull/SIDE_EFFECTS.md
+++ b/apps/cli/src/commands/db/pull/SIDE_EFFECTS.md
@@ -163,7 +163,7 @@ Progress to stderr. Migration path: `Creating shadow database...`,
 `Diffing schemas[: <list>]`, `Schema written to <path>`. Declarative path:
 `Preparing declarative schema export using pg-delta...`, `Declarative schema
 written to <dir>`. Plus the `--use-pg-delta` deprecation line, the
-`--experimental` structured-dump deprecation line, and the history-update
+`--experimental` structured-dump deprecation line (both name v3), and the history-update
 prompt. On success the PostRun line `Finished supabase db pull.` is printed to
 stdout.
 
@@ -190,7 +190,7 @@ Progress strings still go to stderr; stdout carries a single structured envelope
   env var simply leaves unused on a non-linked target). The deprecated
   `--experimental` export honors `--project-ref` the same way `--declarative`
   does.
-- `--use-pg-delta` is hidden and emits the cobra deprecation line to stderr.
+- `--use-pg-delta` is hidden and emits `Flag --use-pg-delta is deprecated and will be removed in v3, use --declarative with [experimental.pgdelta] enabled = true in your config.toml instead.` to stderr.
 - Migration-style pulls always compare migrations with the live target;
   declarative files and `schema_paths` do not replace that baseline.
 - Bundled nontransactional files begin with
@@ -201,8 +201,8 @@ Progress strings still go to stderr; stdout carries a single structured envelope
   empty diff is "No schema changes found". Stack-backed pulls never take this path.
 - The `--experimental` structured-dump branch (or the `SUPABASE_EXPERIMENTAL`
   project-`.env` equivalent) now runs the same in-process declarative export
-  as `--declarative`. It is deprecated: a warning pointing at `--declarative`
-  prints to stderr before the export. `--experimental --declarative` does not
+  as `--declarative`. It is deprecated and will be removed in v3: a warning pointing
+  at `--declarative` prints to stderr before the export. `--experimental --declarative` does not
   print that line. Output is the pg-delta declarative tree under
   `supabase/schemas` (plus `.pgdelta-export.json`), not Go's former
   `schemas/` + `cluster/` AST split.
diff --git a/apps/cli/src/commands/db/pull/pull.integration.test.ts b/apps/cli/src/commands/db/pull/pull.integration.test.ts
index a626a31c54..b0be6b3e14 100644
--- a/apps/cli/src/commands/db/pull/pull.integration.test.ts
+++ b/apps/cli/src/commands/db/pull/pull.integration.test.ts
@@ -1040,7 +1040,9 @@ describe("db pull", () => {
       const s = setup(tmp.current, { edgeStdout: EXPORT_JSON });
       return Effect.gen(function* () {
         yield* dbPull(flags({ usePgDelta: Option.some(true) }));
-        expect(streamText(s.out, "stderr")).toContain("Flag --use-pg-delta has been deprecated");
+        expect(streamText(s.out, "stderr")).toContain(
+          "Flag --use-pg-delta is deprecated and will be removed in v3, use --declarative with [experimental.pgdelta] enabled = true in your config.toml instead.\n",
+        );
         const path = yield* Path.Path;
         expect(streamText(s.out, "stderr")).toContain(
           `Declarative schema written to ${path.join("supabase", "schemas")}\n`,
@@ -1763,7 +1765,7 @@ describe("db pull", () => {
         expect(s.engineCalls[0]?.operation).toBe("export");
         expect(streamText(s.out, "stderr")).toContain("Connecting to remote database...");
         expect(streamText(s.out, "stderr")).toContain(
-          "The --experimental structured-dump mode for `db pull` is deprecated",
+          "The --experimental structured-dump mode for `db pull` is deprecated and will be removed in v3.",
         );
         expect(streamText(s.out, "stderr")).toContain("Preparing declarative schema export");
       }).pipe(Effect.provide(s.layer));
@@ -1818,7 +1820,7 @@ describe("db pull", () => {
       expect(s.engineCalls[0]?.operation).toBe("export");
       expect(s.proxyCalls).toHaveLength(0);
       expect(streamText(s.out, "stderr")).toContain(
-        "The --experimental structured-dump mode for `db pull` is deprecated",
+        "The --experimental structured-dump mode for `db pull` is deprecated and will be removed in v3.",
       );
     }).pipe(Effect.provide(s.layer));
   });
@@ -1842,7 +1844,7 @@ describe("db pull", () => {
         expect(s.engineCalls[0]?.operation).toBe("export");
         expect(streamText(s.out, "stderr")).toContain("Connecting to remote database...");
         expect(streamText(s.out, "stderr")).toContain(
-          "The --experimental structured-dump mode for `db pull` is deprecated",
+          "The --experimental structured-dump mode for `db pull` is deprecated and will be removed in v3.",
         );
       }).pipe(Effect.provide(s.layer));
     },
@@ -2412,7 +2414,9 @@ describe("db remote commit", () => {
       expect(err).toContain(
         `Command "commit" is deprecated and will be removed in v3, use "db pull" instead.\n`,
       );
-      expect(err).toContain("The --experimental structured-dump mode for `db pull` is deprecated");
+      expect(err).toContain(
+        "The --experimental structured-dump mode for `db pull` is deprecated and will be removed in v3.",
+      );
       const fs = yield* FileSystem.FileSystem;
       const path = yield* Path.Path;
       expect(
diff --git a/apps/cli/src/commands/domains/SIDE_EFFECTS.md b/apps/cli/src/commands/domains/SIDE_EFFECTS.md
index ed8baa4a33..9c2e7404f9 100644
--- a/apps/cli/src/commands/domains/SIDE_EFFECTS.md
+++ b/apps/cli/src/commands/domains/SIDE_EFFECTS.md
@@ -93,8 +93,9 @@ suppressed on stderr. `delete` ignores `-o`.
 - `create` validates the CNAME via Cloudflare DNS-over-HTTPS (`https://1.1.1.1`, 10s timeout) before initializing; on failure it short-circuits before any POST.
 - All subcommands resolve the ref via `--project-ref` → `SUPABASE_PROJECT_ID` env → linked-project file.
 - The project-ref fallback env var is `SUPABASE_PROJECT_ID`.
+- `--include-raw-output` is deprecated: passing it with any value (including `--include-raw-output=false`) prints `Flag --include-raw-output is deprecated and will be removed in v3, use -o json instead.` to stderr before the API call, in every output mode, on all five subcommands (including `delete`). stdout is unaffected.
 - **Documented divergences from the old Go CLI (intentional):**
-  - `--include-raw-output` is declared as a normal boolean **on each subcommand** (the old Go CLI declared it as a persistent flag on the `domains` group). Two consequences: (a) it must appear after the subcommand name (`domains get --include-raw-output`) rather than before it (`domains --include-raw-output get`), matching how `--project-ref` is already handled shell-wide; (b) it cannot reproduce the old help-hiding or the `Flag --include-raw-output has been deprecated` stderr warning, which Effect CLI has no hook for. It still reproduces the behavioral effect (forces `-o json` when `-o` is unset/pretty); on `delete` it is inert.
+  - `--include-raw-output` is declared as an optional boolean **on each subcommand** (the old Go CLI declared it as a persistent flag on the `domains` group). Two consequences: (a) it must appear after the subcommand name (`domains get --include-raw-output`) rather than before it (`domains --include-raw-output get`), matching how `--project-ref` is already handled shell-wide; (b) it cannot reproduce the old help-hiding. It still reproduces the behavioral effect (forces `-o json` when the value is `true` and `-o` is unset/pretty); on `delete` it is inert.
   - The degenerate `validation_records != 1` status message approximates a Go-style `%+v` struct dump (which embeds a non-deterministic pointer address).
   - Text-mode status output is newline-terminated even where the old CLI's output wasn't. Without the final newline, interactive shell prompts can redraw over the last status line, hiding the ACME TXT record.
   - In a structured `-o` mode the human status is suppressed on stderr, keeping stdout clean and matching the parity contract.
diff --git a/apps/cli/src/commands/domains/activate/activate.command.ts b/apps/cli/src/commands/domains/activate/activate.command.ts
index e4cb5d7b8a..9a83478686 100644
--- a/apps/cli/src/commands/domains/activate/activate.command.ts
+++ b/apps/cli/src/commands/domains/activate/activate.command.ts
@@ -13,7 +13,7 @@ const config = {
   ),
   includeRawOutput: Flag.Boolean("include-raw-output").pipe(
     Flag.withDescription("(Deprecated) use -o json instead."),
-    Flag.withDefault(false),
+    Flag.optional,
   ),
 } as const;
 
diff --git a/apps/cli/src/commands/domains/activate/activate.handler.ts b/apps/cli/src/commands/domains/activate/activate.handler.ts
index cc267ad126..e3844d3436 100644
--- a/apps/cli/src/commands/domains/activate/activate.handler.ts
+++ b/apps/cli/src/commands/domains/activate/activate.handler.ts
@@ -1,10 +1,11 @@
-import { Effect } from "effect";
+import { Effect, Option } from "effect";
 
 import { CommandPlatformApi } from "../../../auth/command-platform-api.service.ts";
 import { ProjectRefResolver } from "../../../config/project-ref.service.ts";
 import { Output } from "../../../shared/output/output.service.ts";
 import { LinkedProjectCache } from "../../../telemetry/linked-project-cache.service.ts";
 import { TelemetryState } from "../../../telemetry/telemetry-state.service.ts";
+import { warnIncludeRawOutputDeprecated } from "../domains.deprecation.ts";
 import { emitHostnameResult } from "../domains.emit.ts";
 import { mapDomainsHttpError } from "../domains.errors.ts";
 import { gateMapError } from "../../../command-internal/upgrade-suggest.ts";
@@ -21,6 +22,8 @@ export const domainsActivate = Effect.fn("domains.activate")(function* (
   const linkedProjectCache = yield* LinkedProjectCache;
   const telemetryState = yield* TelemetryState;
 
+  yield* warnIncludeRawOutputDeprecated(flags.includeRawOutput);
+
   const ref = yield* resolver.resolve(flags.projectRef);
 
   yield* Effect.gen(function* () {
@@ -32,6 +35,9 @@ export const domainsActivate = Effect.fn("domains.activate")(function* (
     );
     yield* activating?.clear ?? Effect.void;
 
-    yield* emitHostnameResult(response, flags.includeRawOutput);
+    yield* emitHostnameResult(
+      response,
+      Option.getOrElse(flags.includeRawOutput, () => false),
+    );
   }).pipe(Effect.ensuring(linkedProjectCache.cache(ref)), Effect.ensuring(telemetryState.flush));
 });
diff --git a/apps/cli/src/commands/domains/activate/activate.integration.test.ts b/apps/cli/src/commands/domains/activate/activate.integration.test.ts
index eabbff260a..f352793246 100644
--- a/apps/cli/src/commands/domains/activate/activate.integration.test.ts
+++ b/apps/cli/src/commands/domains/activate/activate.integration.test.ts
@@ -1,6 +1,6 @@
 import { type V1GetHostnameConfigOutput } from "@supabase/api/effect";
 import { describe, expect, it } from "@effect/vitest";
-import { Cause, Effect, Exit, Option } from "effect";
+import { Cause, Effect, Exit, Option, Schema } from "effect";
 
 import { mockAnalytics, mockOutput } from "../../../../tests/helpers/mocks.ts";
 import {
@@ -65,7 +65,9 @@ function setup(opts: SetupOpts = {}) {
   return { layer, out, api, analytics, telemetry, linkedProjectCache };
 }
 
-const baseFlags = { projectRef: Option.none<string>(), includeRawOutput: false };
+const baseFlags = { projectRef: Option.none<string>(), includeRawOutput: Option.none<boolean>() };
+
+const DeprecationJsonObject = Schema.fromJsonString(Schema.Record(Schema.String, Schema.Unknown));
 
 describe("domains activate integration", () => {
   it.effect("suggests upgrade from entitlement_required envelope on 400", () => {
@@ -127,11 +129,39 @@ describe("domains activate integration", () => {
     }).pipe(Effect.provide(layer));
   });
 
-  it.effect("forces Go JSON output when --include-raw-output is set", () => {
+  it.effect(
+    "warns on stderr and keeps stdout JSON parseable when --include-raw-output is set",
+    () => {
+      const { layer, out } = setup();
+      return Effect.gen(function* () {
+        yield* domainsActivate({ projectRef: Option.none(), includeRawOutput: Option.some(true) });
+        expect(out.stderrText).toBe(
+          "Flag --include-raw-output is deprecated and will be removed in v3, use -o json instead.\n",
+        );
+        const parsed = yield* Schema.decodeEffect(DeprecationJsonObject)(out.stdoutText);
+        expect(parsed.custom_hostname).toBe("shop.acme.dev");
+      }).pipe(Effect.provide(layer));
+    },
+  );
+
+  it.effect("warns but does not force JSON when --include-raw-output=false", () => {
     const { layer, out } = setup();
     return Effect.gen(function* () {
-      yield* domainsActivate({ projectRef: Option.none(), includeRawOutput: true });
-      expect(out.stdoutText.startsWith("{")).toBe(true);
+      yield* domainsActivate({ projectRef: Option.none(), includeRawOutput: Option.some(false) });
+      expect(
+        out.stderrText.startsWith(
+          "Flag --include-raw-output is deprecated and will be removed in v3, use -o json instead.\n",
+        ),
+      ).toBe(true);
+      expect(out.stdoutText).toBe("");
+    }).pipe(Effect.provide(layer));
+  });
+
+  it.effect("does not warn when --include-raw-output is not set", () => {
+    const { layer, out } = setup();
+    return Effect.gen(function* () {
+      yield* domainsActivate(baseFlags);
+      expect(out.stderrText).not.toContain("deprecated");
     }).pipe(Effect.provide(layer));
   });
 
diff --git a/apps/cli/src/commands/domains/create/create.command.ts b/apps/cli/src/commands/domains/create/create.command.ts
index 008fde822d..f8f7737ed6 100644
--- a/apps/cli/src/commands/domains/create/create.command.ts
+++ b/apps/cli/src/commands/domains/create/create.command.ts
@@ -16,7 +16,7 @@ const config = {
   ),
   includeRawOutput: Flag.Boolean("include-raw-output").pipe(
     Flag.withDescription("(Deprecated) use -o json instead."),
-    Flag.withDefault(false),
+    Flag.optional,
   ),
 } as const;
 
diff --git a/apps/cli/src/commands/domains/create/create.handler.ts b/apps/cli/src/commands/domains/create/create.handler.ts
index 96d91eca98..76336a82aa 100644
--- a/apps/cli/src/commands/domains/create/create.handler.ts
+++ b/apps/cli/src/commands/domains/create/create.handler.ts
@@ -1,4 +1,4 @@
-import { Effect } from "effect";
+import { Effect, Option } from "effect";
 import * as HttpClient from "effect/http/HttpClient";
 
 import { CommandPlatformApi } from "../../../auth/command-platform-api.service.ts";
@@ -8,6 +8,7 @@ import { Output } from "../../../shared/output/output.service.ts";
 import { LinkedProjectCache } from "../../../telemetry/linked-project-cache.service.ts";
 import { TelemetryState } from "../../../telemetry/telemetry-state.service.ts";
 import { verifyCname } from "../domains.cname.ts";
+import { warnIncludeRawOutputDeprecated } from "../domains.deprecation.ts";
 import { emitHostnameResult } from "../domains.emit.ts";
 import { mapDomainsHttpError } from "../domains.errors.ts";
 import { gateMapError } from "../../../command-internal/upgrade-suggest.ts";
@@ -24,6 +25,8 @@ export const domainsCreate = Effect.fn("domains.create")(function* (flags: Domai
   const linkedProjectCache = yield* LinkedProjectCache;
   const telemetryState = yield* TelemetryState;
 
+  yield* warnIncludeRawOutputDeprecated(flags.includeRawOutput);
+
   const ref = yield* resolver.resolve(flags.projectRef);
 
   // Write the linked-project cache and persist the telemetry state file on
@@ -48,6 +51,9 @@ export const domainsCreate = Effect.fn("domains.create")(function* (flags: Domai
       );
     yield* creating?.clear ?? Effect.void;
 
-    yield* emitHostnameResult(response, flags.includeRawOutput);
+    yield* emitHostnameResult(
+      response,
+      Option.getOrElse(flags.includeRawOutput, () => false),
+    );
   }).pipe(Effect.ensuring(linkedProjectCache.cache(ref)), Effect.ensuring(telemetryState.flush));
 });
diff --git a/apps/cli/src/commands/domains/create/create.integration.test.ts b/apps/cli/src/commands/domains/create/create.integration.test.ts
index 07571e7642..6ccb0b2d23 100644
--- a/apps/cli/src/commands/domains/create/create.integration.test.ts
+++ b/apps/cli/src/commands/domains/create/create.integration.test.ts
@@ -1,6 +1,6 @@
 import { type V1GetHostnameConfigOutput } from "@supabase/api/effect";
 import { describe, expect, it } from "@effect/vitest";
-import { Cause, Deferred, Effect, Exit, Fiber, Option } from "effect";
+import { Cause, Deferred, Effect, Exit, Fiber, Option, Schema } from "effect";
 import { TestClock } from "effect/testing";
 
 import { mockAnalytics, mockOutput } from "../../../../tests/helpers/mocks.ts";
@@ -98,11 +98,11 @@ function setup(opts: SetupOpts = {}) {
   return { layer, out, api, analytics, telemetry, linkedProjectCache };
 }
 
-function flags(over: Partial<{ includeRawOutput: boolean }> = {}) {
+function flags(over: Partial<{ includeRawOutput: Option.Option<boolean> }> = {}) {
   return {
     projectRef: Option.none<string>(),
     customHostname: CUSTOM_HOSTNAME,
-    includeRawOutput: over.includeRawOutput ?? false,
+    includeRawOutput: over.includeRawOutput ?? Option.none<boolean>(),
   };
 }
 
@@ -110,6 +110,8 @@ function postedToInitialize(api: { requests: ReadonlyArray<{ url: string }> }):
   return api.requests.some((r) => r.url.includes("/custom-hostname/initialize"));
 }
 
+const DeprecationJsonObject = Schema.fromJsonString(Schema.Record(Schema.String, Schema.Unknown));
+
 describe("domains create integration", () => {
   it.effect("verifies the CNAME, creates the hostname, and prints status to stderr", () => {
     const { layer, out, api, telemetry, linkedProjectCache } = setup();
@@ -262,11 +264,39 @@ describe("domains create integration", () => {
     }).pipe(Effect.provide(layer));
   });
 
-  it.effect("forces Go JSON output when --include-raw-output is set", () => {
+  it.effect(
+    "warns on stderr and keeps stdout JSON parseable when --include-raw-output is set",
+    () => {
+      const { layer, out } = setup();
+      return Effect.gen(function* () {
+        yield* domainsCreate(flags({ includeRawOutput: Option.some(true) }));
+        expect(out.stderrText).toBe(
+          "Flag --include-raw-output is deprecated and will be removed in v3, use -o json instead.\n",
+        );
+        const parsed = yield* Schema.decodeEffect(DeprecationJsonObject)(out.stdoutText);
+        expect(parsed.custom_hostname).toBe(CUSTOM_HOSTNAME);
+      }).pipe(Effect.provide(layer));
+    },
+  );
+
+  it.effect("warns but does not force JSON when --include-raw-output=false", () => {
     const { layer, out } = setup();
     return Effect.gen(function* () {
-      yield* domainsCreate(flags({ includeRawOutput: true }));
-      expect(out.stdoutText.startsWith("{")).toBe(true);
+      yield* domainsCreate(flags({ includeRawOutput: Option.some(false) }));
+      expect(
+        out.stderrText.startsWith(
+          "Flag --include-raw-output is deprecated and will be removed in v3, use -o json instead.\n",
+        ),
+      ).toBe(true);
+      expect(out.stdoutText).toBe("");
+    }).pipe(Effect.provide(layer));
+  });
+
+  it.effect("does not warn when --include-raw-output is not set", () => {
+    const { layer, out } = setup();
+    return Effect.gen(function* () {
+      yield* domainsCreate(flags());
+      expect(out.stderrText).not.toContain("deprecated");
     }).pipe(Effect.provide(layer));
   });
 
diff --git a/apps/cli/src/commands/domains/delete/delete.command.ts b/apps/cli/src/commands/domains/delete/delete.command.ts
index 0206785052..c45cecd071 100644
--- a/apps/cli/src/commands/domains/delete/delete.command.ts
+++ b/apps/cli/src/commands/domains/delete/delete.command.ts
@@ -13,7 +13,7 @@ const config = {
   ),
   includeRawOutput: Flag.Boolean("include-raw-output").pipe(
     Flag.withDescription("(Deprecated) use -o json instead."),
-    Flag.withDefault(false),
+    Flag.optional,
   ),
 } as const;
 
diff --git a/apps/cli/src/commands/domains/delete/delete.handler.ts b/apps/cli/src/commands/domains/delete/delete.handler.ts
index 0cab96bb18..c8286c3017 100644
--- a/apps/cli/src/commands/domains/delete/delete.handler.ts
+++ b/apps/cli/src/commands/domains/delete/delete.handler.ts
@@ -5,6 +5,7 @@ import { ProjectRefResolver } from "../../../config/project-ref.service.ts";
 import { Output } from "../../../shared/output/output.service.ts";
 import { LinkedProjectCache } from "../../../telemetry/linked-project-cache.service.ts";
 import { TelemetryState } from "../../../telemetry/telemetry-state.service.ts";
+import { warnIncludeRawOutputDeprecated } from "../domains.deprecation.ts";
 import { mapDomainsHttpError } from "../domains.errors.ts";
 import type { DomainsDeleteFlags } from "./delete.command.ts";
 
@@ -12,9 +13,8 @@ const mapDeleteError = mapDomainsHttpError("delete");
 
 const DELETE_SUCCESS_MESSAGE = "Deleted custom hostname config successfully.";
 
-// `flags.includeRawOutput` is unread: `--include-raw-output` is a persistent flag on the
-// `domains` group, so it's accepted on `delete` too, but ignored — delete has no response
-// body to encode. Asserted by the "ignores --include-raw-output" integration test.
+// `--include-raw-output` is accepted on `delete` but inert (only the deprecation warning fires):
+// delete has no response body to encode.
 export const domainsDelete = Effect.fn("domains.delete")(function* (flags: DomainsDeleteFlags) {
   const output = yield* Output;
   const api = yield* CommandPlatformApi;
@@ -22,6 +22,8 @@ export const domainsDelete = Effect.fn("domains.delete")(function* (flags: Domai
   const linkedProjectCache = yield* LinkedProjectCache;
   const telemetryState = yield* TelemetryState;
 
+  yield* warnIncludeRawOutputDeprecated(flags.includeRawOutput);
+
   const ref = yield* resolver.resolve(flags.projectRef);
 
   yield* Effect.gen(function* () {
diff --git a/apps/cli/src/commands/domains/delete/delete.integration.test.ts b/apps/cli/src/commands/domains/delete/delete.integration.test.ts
index e874de9286..f7e62c7c80 100644
--- a/apps/cli/src/commands/domains/delete/delete.integration.test.ts
+++ b/apps/cli/src/commands/domains/delete/delete.integration.test.ts
@@ -43,7 +43,7 @@ function setup(opts: SetupOpts = {}) {
   return { layer, out, api, telemetry, linkedProjectCache };
 }
 
-const baseFlags = { projectRef: Option.none<string>(), includeRawOutput: false };
+const baseFlags = { projectRef: Option.none<string>(), includeRawOutput: Option.none<boolean>() };
 
 describe("domains delete integration", () => {
   it.effect("prints the success line to stderr in text mode", () => {
@@ -84,12 +84,30 @@ describe("domains delete integration", () => {
     }).pipe(Effect.provide(layer));
   });
 
-  it.effect("ignores --include-raw-output (inert on delete, Go parity)", () => {
+  it.effect(
+    "is inert apart from the stderr deprecation warning when --include-raw-output is set",
+    () => {
+      const { layer, out } = setup({ goOutput: "json" });
+      return Effect.gen(function* () {
+        yield* domainsDelete({ projectRef: Option.none(), includeRawOutput: Option.some(true) });
+        expect(out.stdoutText).toBe("");
+        expect(out.stderrText).toBe(
+          "Flag --include-raw-output is deprecated and will be removed in v3, use -o json instead.\n" +
+            "Deleted custom hostname config successfully.\n",
+        );
+      }).pipe(Effect.provide(layer));
+    },
+  );
+
+  it.effect("warns when --include-raw-output=false", () => {
     const { layer, out } = setup();
     return Effect.gen(function* () {
-      yield* domainsDelete({ projectRef: Option.none(), includeRawOutput: true });
+      yield* domainsDelete({ projectRef: Option.none(), includeRawOutput: Option.some(false) });
       expect(out.stdoutText).toBe("");
-      expect(out.stderrText).toBe("Deleted custom hostname config successfully.\n");
+      expect(out.stderrText).toBe(
+        "Flag --include-raw-output is deprecated and will be removed in v3, use -o json instead.\n" +
+          "Deleted custom hostname config successfully.\n",
+      );
     }).pipe(Effect.provide(layer));
   });
 
diff --git a/apps/cli/src/commands/domains/domains.deprecation.ts b/apps/cli/src/commands/domains/domains.deprecation.ts
new file mode 100644
index 0000000000..324e208706
--- /dev/null
+++ b/apps/cli/src/commands/domains/domains.deprecation.ts
@@ -0,0 +1,16 @@
+import { Effect, Option } from "effect";
+
+import { Output } from "../../shared/output/output.service.ts";
+
+const INCLUDE_RAW_OUTPUT_DEPRECATION =
+  "Flag --include-raw-output is deprecated and will be removed in v3, use -o json instead.\n";
+
+export const warnIncludeRawOutputDeprecated = Effect.fnUntraced(function* (
+  includeRawOutput: Option.Option<boolean>,
+) {
+  if (Option.isNone(includeRawOutput)) {
+    return;
+  }
+  const output = yield* Output;
+  yield* output.raw(INCLUDE_RAW_OUTPUT_DEPRECATION, "stderr");
+});
diff --git a/apps/cli/src/commands/domains/get/get.command.ts b/apps/cli/src/commands/domains/get/get.command.ts
index 03d0170ef3..c16551ad4f 100644
--- a/apps/cli/src/commands/domains/get/get.command.ts
+++ b/apps/cli/src/commands/domains/get/get.command.ts
@@ -13,7 +13,7 @@ const config = {
   ),
   includeRawOutput: Flag.Boolean("include-raw-output").pipe(
     Flag.withDescription("(Deprecated) use -o json instead."),
-    Flag.withDefault(false),
+    Flag.optional,
   ),
 } as const;
 
diff --git a/apps/cli/src/commands/domains/get/get.handler.ts b/apps/cli/src/commands/domains/get/get.handler.ts
index e1c1faa711..2d752e8098 100644
--- a/apps/cli/src/commands/domains/get/get.handler.ts
+++ b/apps/cli/src/commands/domains/get/get.handler.ts
@@ -1,10 +1,11 @@
-import { Effect } from "effect";
+import { Effect, Option } from "effect";
 
 import { CommandPlatformApi } from "../../../auth/command-platform-api.service.ts";
 import { ProjectRefResolver } from "../../../config/project-ref.service.ts";
 import { Output } from "../../../shared/output/output.service.ts";
 import { LinkedProjectCache } from "../../../telemetry/linked-project-cache.service.ts";
 import { TelemetryState } from "../../../telemetry/telemetry-state.service.ts";
+import { warnIncludeRawOutputDeprecated } from "../domains.deprecation.ts";
 import { emitHostnameResult } from "../domains.emit.ts";
 import { mapDomainsHttpError } from "../domains.errors.ts";
 import { gateMapError } from "../../../command-internal/upgrade-suggest.ts";
@@ -19,6 +20,8 @@ export const domainsGet = Effect.fn("domains.get")(function* (flags: DomainsGetF
   const linkedProjectCache = yield* LinkedProjectCache;
   const telemetryState = yield* TelemetryState;
 
+  yield* warnIncludeRawOutputDeprecated(flags.includeRawOutput);
+
   const ref = yield* resolver.resolve(flags.projectRef);
 
   // Write the linked-project cache and persist the telemetry state file on
@@ -34,6 +37,9 @@ export const domainsGet = Effect.fn("domains.get")(function* (flags: DomainsGetF
     );
     yield* fetching?.clear ?? Effect.void;
 
-    yield* emitHostnameResult(response, flags.includeRawOutput);
+    yield* emitHostnameResult(
+      response,
+      Option.getOrElse(flags.includeRawOutput, () => false),
+    );
   }).pipe(Effect.ensuring(linkedProjectCache.cache(ref)), Effect.ensuring(telemetryState.flush));
 });
diff --git a/apps/cli/src/commands/domains/get/get.integration.test.ts b/apps/cli/src/commands/domains/get/get.integration.test.ts
index df325190ba..86d38e6acd 100644
--- a/apps/cli/src/commands/domains/get/get.integration.test.ts
+++ b/apps/cli/src/commands/domains/get/get.integration.test.ts
@@ -78,7 +78,9 @@ function setup(opts: SetupOpts = {}) {
   return { layer, out, api, analytics, telemetry, linkedProjectCache };
 }
 
-const baseFlags = { projectRef: Option.none<string>(), includeRawOutput: false };
+const baseFlags = { projectRef: Option.none<string>(), includeRawOutput: Option.none<boolean>() };
+
+const DeprecationJsonObject = Schema.fromJsonString(Schema.Record(Schema.String, Schema.Unknown));
 
 describe("domains get integration", () => {
   it.effect("prints the hostname status to stderr in text mode", () => {
@@ -336,12 +338,40 @@ describe("domains get integration", () => {
     }).pipe(Effect.provide(layer));
   });
 
-  it.effect("forces Go JSON output when --include-raw-output is set", () => {
+  it.effect(
+    "warns on stderr and keeps stdout JSON parseable when --include-raw-output is set",
+    () => {
+      const { layer, out } = setup();
+      return Effect.gen(function* () {
+        yield* domainsGet({ projectRef: Option.none(), includeRawOutput: Option.some(true) });
+        expect(out.stderrText).toBe(
+          "Flag --include-raw-output is deprecated and will be removed in v3, use -o json instead.\n",
+        );
+        const parsed = yield* Schema.decodeEffect(DeprecationJsonObject)(out.stdoutText);
+        expect(parsed.custom_hostname).toBe("shop.acme.dev");
+        expect(out.stdoutText).toContain('"custom_hostname": "shop.acme.dev"');
+      }).pipe(Effect.provide(layer));
+    },
+  );
+
+  it.effect("warns but does not force JSON when --include-raw-output=false", () => {
     const { layer, out } = setup();
     return Effect.gen(function* () {
-      yield* domainsGet({ projectRef: Option.none(), includeRawOutput: true });
-      expect(out.stdoutText.startsWith("{")).toBe(true);
-      expect(out.stdoutText).toContain('"custom_hostname": "shop.acme.dev"');
+      yield* domainsGet({ projectRef: Option.none(), includeRawOutput: Option.some(false) });
+      expect(
+        out.stderrText.startsWith(
+          "Flag --include-raw-output is deprecated and will be removed in v3, use -o json instead.\n",
+        ),
+      ).toBe(true);
+      expect(out.stdoutText).toBe("");
+    }).pipe(Effect.provide(layer));
+  });
+
+  it.effect("does not warn when --include-raw-output is not set", () => {
+    const { layer, out } = setup();
+    return Effect.gen(function* () {
+      yield* domainsGet(baseFlags);
+      expect(out.stderrText).not.toContain("deprecated");
     }).pipe(Effect.provide(layer));
   });
 
@@ -350,7 +380,7 @@ describe("domains get integration", () => {
     () => {
       const { layer, out } = setup({ goOutput: "pretty" });
       return Effect.gen(function* () {
-        yield* domainsGet({ projectRef: Option.none(), includeRawOutput: true });
+        yield* domainsGet({ projectRef: Option.none(), includeRawOutput: Option.some(true) });
         expect(out.stdoutText.startsWith("{")).toBe(true);
       }).pipe(Effect.provide(layer));
     },
diff --git a/apps/cli/src/commands/domains/reverify/reverify.command.ts b/apps/cli/src/commands/domains/reverify/reverify.command.ts
index 0565b0126f..8f686eaa02 100644
--- a/apps/cli/src/commands/domains/reverify/reverify.command.ts
+++ b/apps/cli/src/commands/domains/reverify/reverify.command.ts
@@ -13,7 +13,7 @@ const config = {
   ),
   includeRawOutput: Flag.Boolean("include-raw-output").pipe(
     Flag.withDescription("(Deprecated) use -o json instead."),
-    Flag.withDefault(false),
+    Flag.optional,
   ),
 } as const;
 
diff --git a/apps/cli/src/commands/domains/reverify/reverify.handler.ts b/apps/cli/src/commands/domains/reverify/reverify.handler.ts
index 6b2e47c58d..a7b10b9dee 100644
--- a/apps/cli/src/commands/domains/reverify/reverify.handler.ts
+++ b/apps/cli/src/commands/domains/reverify/reverify.handler.ts
@@ -1,10 +1,11 @@
-import { Effect } from "effect";
+import { Effect, Option } from "effect";
 
 import { CommandPlatformApi } from "../../../auth/command-platform-api.service.ts";
 import { ProjectRefResolver } from "../../../config/project-ref.service.ts";
 import { Output } from "../../../shared/output/output.service.ts";
 import { LinkedProjectCache } from "../../../telemetry/linked-project-cache.service.ts";
 import { TelemetryState } from "../../../telemetry/telemetry-state.service.ts";
+import { warnIncludeRawOutputDeprecated } from "../domains.deprecation.ts";
 import { emitHostnameResult } from "../domains.emit.ts";
 import { mapDomainsHttpError } from "../domains.errors.ts";
 import { gateMapError } from "../../../command-internal/upgrade-suggest.ts";
@@ -21,6 +22,8 @@ export const domainsReverify = Effect.fn("domains.reverify")(function* (
   const linkedProjectCache = yield* LinkedProjectCache;
   const telemetryState = yield* TelemetryState;
 
+  yield* warnIncludeRawOutputDeprecated(flags.includeRawOutput);
+
   const ref = yield* resolver.resolve(flags.projectRef);
 
   yield* Effect.gen(function* () {
@@ -32,6 +35,9 @@ export const domainsReverify = Effect.fn("domains.reverify")(function* (
     );
     yield* reverifying?.clear ?? Effect.void;
 
-    yield* emitHostnameResult(response, flags.includeRawOutput);
+    yield* emitHostnameResult(
+      response,
+      Option.getOrElse(flags.includeRawOutput, () => false),
+    );
   }).pipe(Effect.ensuring(linkedProjectCache.cache(ref)), Effect.ensuring(telemetryState.flush));
 });
diff --git a/apps/cli/src/commands/domains/reverify/reverify.integration.test.ts b/apps/cli/src/commands/domains/reverify/reverify.integration.test.ts
index ad3965fb74..d5e24c50b0 100644
--- a/apps/cli/src/commands/domains/reverify/reverify.integration.test.ts
+++ b/apps/cli/src/commands/domains/reverify/reverify.integration.test.ts
@@ -1,6 +1,6 @@
 import { type V1GetHostnameConfigOutput } from "@supabase/api/effect";
 import { describe, expect, it } from "@effect/vitest";
-import { Cause, Effect, Exit, Option } from "effect";
+import { Cause, Effect, Exit, Option, Schema } from "effect";
 
 import { mockAnalytics, mockOutput } from "../../../../tests/helpers/mocks.ts";
 import {
@@ -65,7 +65,9 @@ function setup(opts: SetupOpts = {}) {
   return { layer, out, api, analytics, telemetry, linkedProjectCache };
 }
 
-const baseFlags = { projectRef: Option.none<string>(), includeRawOutput: false };
+const baseFlags = { projectRef: Option.none<string>(), includeRawOutput: Option.none<boolean>() };
+
+const DeprecationJsonObject = Schema.fromJsonString(Schema.Record(Schema.String, Schema.Unknown));
 
 describe("domains reverify integration", () => {
   it.effect("suggests upgrade from entitlement_required envelope on 400", () => {
@@ -126,11 +128,39 @@ describe("domains reverify integration", () => {
     }).pipe(Effect.provide(layer));
   });
 
-  it.effect("forces Go JSON output when --include-raw-output is set", () => {
+  it.effect(
+    "warns on stderr and keeps stdout JSON parseable when --include-raw-output is set",
+    () => {
+      const { layer, out } = setup();
+      return Effect.gen(function* () {
+        yield* domainsReverify({ projectRef: Option.none(), includeRawOutput: Option.some(true) });
+        expect(out.stderrText).toBe(
+          "Flag --include-raw-output is deprecated and will be removed in v3, use -o json instead.\n",
+        );
+        const parsed = yield* Schema.decodeEffect(DeprecationJsonObject)(out.stdoutText);
+        expect(parsed.custom_hostname).toBe("shop.acme.dev");
+      }).pipe(Effect.provide(layer));
+    },
+  );
+
+  it.effect("warns but does not force JSON when --include-raw-output=false", () => {
     const { layer, out } = setup();
     return Effect.gen(function* () {
-      yield* domainsReverify({ projectRef: Option.none(), includeRawOutput: true });
-      expect(out.stdoutText.startsWith("{")).toBe(true);
+      yield* domainsReverify({ projectRef: Option.none(), includeRawOutput: Option.some(false) });
+      expect(
+        out.stderrText.startsWith(
+          "Flag --include-raw-output is deprecated and will be removed in v3, use -o json instead.\n",
+        ),
+      ).toBe(true);
+      expect(out.stdoutText).toBe("");
+    }).pipe(Effect.provide(layer));
+  });
+
+  it.effect("does not warn when --include-raw-output is not set", () => {
+    const { layer, out } = setup();
+    return Effect.gen(function* () {
+      yield* domainsReverify(baseFlags);
+      expect(out.stderrText).not.toContain("deprecated");
     }).pipe(Effect.provide(layer));
   });