diff --git a/.github/workflows/delimit.yml b/.github/workflows/delimit.yml
new file mode 100644
index 0000000..5fd40de
--- /dev/null
+++ b/.github/workflows/delimit.yml
@@ -0,0 +1,42 @@
+name: Delimit governance
+
+on:
+  pull_request:
+    paths:
+      - 'packages/sdk/src/schema/**'
+      - 'schemas/**'
+      - '.github/workflows/delimit.yml'
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  delimit:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+
+      - uses: pnpm/action-setup@v3
+        with:
+          version: 9
+
+      - name: Install deps
+        run: pnpm install --frozen-lockfile
+
+      # Pin to feature-branch commit during testing. Will switch to
+      # delimit-ai/delimit-action@v1 once v1.9.0 ships.
+      - name: Delimit governance check
+        uses: delimit-ai/delimit-action@1a19928543801504c4fe29a5cff24280d7da88c6
+        with:
+          spec: schemas/v1/agent.schema.json
+          mode: advisory
+          generator_command: pnpm run schema:export
+          generator_artifact: schemas/v1/agent.schema.json
diff --git a/packages/sdk/src/schema/manifest.schema.ts b/packages/sdk/src/schema/manifest.schema.ts
index 4e26b96..02b47ef 100644
--- a/packages/sdk/src/schema/manifest.schema.ts
+++ b/packages/sdk/src/schema/manifest.schema.ts
@@ -564,7 +564,7 @@ const SpecSchema = z.object({
 
 // ── Top-level Manifest ────────────────────────────────────────────────────────
 export const ManifestSchema = z.object({
-  apiVersion: z.literal('agentspec.io/v1'),
+  apiVersion: z.literal('agentspec.io/v1alpha1'),
   kind: z.literal('AgentSpec'),
   metadata: MetadataSchema,
   spec: SpecSchema,