diff --git a/.github/scripts/open_docs_stub_pr.py b/.github/scripts/open_docs_stub_pr.py
new file mode 100644
index 0000000..3057a75
--- /dev/null
+++ b/.github/scripts/open_docs_stub_pr.py
@@ -0,0 +1,152 @@
+#!/usr/bin/env python3
+"""
+open_docs_stub_pr.py
+
+Opens a draft PR in pinecone-io/docs with TODO annotations for each
+doc page flagged by check_docs_coverage.py. Runs only on the scheduled
+drift-detection job, not on every PR.
+
+Requirements:
+  - gh CLI (pre-installed on GitHub Actions ubuntu-latest runners)
+  - DOCS_TOKEN env var: a PAT with `repo` scope on pinecone-io/docs
+
+Usage:
+    python .github/scripts/open_docs_stub_pr.py \
+        --gaps docs-gaps.json \
+        --docs-repo pinecone-io/docs \
+        --token "$DOCS_TOKEN"
+"""
+
+import argparse
+import json
+import os
+import subprocess
+import sys
+import tempfile
+from datetime import date
+from pathlib import Path
+
+
+def run(cmd: list[str], cwd: str | None = None, env: dict | None = None) -> None:
+    print(f"  $ {' '.join(str(c) for c in cmd)}", flush=True)
+    subprocess.run(cmd, cwd=cwd, env=env, check=True)
+
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--gaps", default="docs-gaps.json")
+    parser.add_argument("--docs-repo", default="pinecone-io/docs")
+    parser.add_argument("--token", default=os.environ.get("DOCS_TOKEN", ""))
+    args = parser.parse_args()
+
+    if not args.token:
+        print("Error: --token or DOCS_TOKEN required", file=sys.stderr)
+        sys.exit(1)
+
+    with open(args.gaps) as f:
+        gaps = json.load(f)
+
+    if not gaps:
+        print("No gaps — nothing to open a PR for.")
+        return
+
+    today = date.today().isoformat()
+    branch = f"chore/sdk-drift-{today}"
+    pr_title = f"chore: update docs for SDK drift ({today})"
+
+    # Group gaps by page so we insert one comment block per page
+    pages: dict[str, list[dict]] = {}
+    for gap in gaps:
+        pages.setdefault(gap["doc_page"], []).append(gap)
+
+    gh_env = {**os.environ, "GH_TOKEN": args.token}
+
+    with tempfile.TemporaryDirectory() as tmpdir:
+        run(["gh", "repo", "clone", args.docs_repo, tmpdir, "--", "--depth=1"], env=gh_env)
+        run(["git", "checkout", "-b", branch], cwd=tmpdir)
+        run(["git", "config", "user.email", "github-actions[bot]@users.noreply.github.com"], cwd=tmpdir)
+        run(["git", "config", "user.name", "github-actions[bot]"], cwd=tmpdir)
+
+        modified = []
+        for page_path, page_gaps in pages.items():
+            # Docs repo stores guides as docs/guides/<page>.mdx
+            mdx_path = Path(tmpdir) / f"{page_path}.mdx"
+            if not mdx_path.exists():
+                # Try without leading "guides/"
+                alt = Path(tmpdir) / "docs" / f"{page_path}.mdx"
+                if alt.exists():
+                    mdx_path = alt
+                else:
+                    print(f"  Skipping {page_path} — .mdx not found in clone")
+                    continue
+
+            content = mdx_path.read_text()
+
+            todos = []
+            for g in page_gaps:
+                msg = f"TODO(sdk-drift): `{g['symbol']}` {g['change']}"
+                if g.get("before") and g.get("after"):
+                    msg += f"\n  was: {g['before']}\n  now: {g['after']}"
+                todos.append(f"{{/* {msg} */}}")
+
+            stub_block = "\n".join(todos)
+
+            # Insert after frontmatter (between second and third "---" markers)
+            parts = content.split("---", 2)
+            if len(parts) == 3:
+                updated = f"---{parts[1]}---\n\n{stub_block}\n{parts[2]}"
+            else:
+                updated = f"{stub_block}\n\n{content}"
+
+            mdx_path.write_text(updated)
+            modified.append(str(mdx_path.relative_to(tmpdir)))
+            print(f"  Annotated {page_path}")
+
+        if not modified:
+            print("No .mdx files found in clone for the flagged pages — no PR opened.")
+            return
+
+        run(["git", "add"] + modified, cwd=tmpdir)
+        run(
+            ["git", "commit", "-m", f"chore: add drift annotations ({today})"],
+            cwd=tmpdir,
+        )
+        run(["git", "push", "origin", branch], cwd=tmpdir, env=gh_env)
+
+        # Build PR body
+        body = ["## SDK drift detected", ""]
+        body.append(
+            "The weekly `docs-drift-detector` found SDK method changes that may need doc updates."
+        )
+        body.append("")
+        body.append("### Pages to review")
+        body.append("")
+        for page, page_gaps in pages.items():
+            body.append(f"**`{page}`**")
+            for g in page_gaps:
+                item = f"- [ ] `{g['symbol']}` ({g['change']})"
+                if g.get("before") and g.get("after"):
+                    item += f": `{g['before']}` → `{g['after']}`"
+                body.append(item)
+            body.append("")
+        body.append(
+            "_Auto-generated stub. Mark items done as pages are updated. Close if not applicable._"
+        )
+
+        run(
+            [
+                "gh", "pr", "create",
+                "--repo", args.docs_repo,
+                "--head", branch,
+                "--title", pr_title,
+                "--body", "\n".join(body),
+                "--draft",
+            ],
+            env=gh_env,
+        )
+
+    print(f"Draft PR opened: {pr_title}")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/.github/workflows/spec-drift-detector.yaml b/.github/workflows/spec-drift-detector.yaml
new file mode 100644
index 0000000..5f7a47d
--- /dev/null
+++ b/.github/workflows/spec-drift-detector.yaml
@@ -0,0 +1,147 @@
+# Detects when an OpenAPI spec change requires docs/SDK updates.
+#
+# On PR:      comments affected guide pages + impacted SDKs (breaking changes first).
+# Scheduled:  diffs the two newest version snapshots; opens a draft PR in pinecone-io/docs.
+#
+# Deps: Python 3.12 + pyyaml. No other runtime dependencies.
+
+name: spec-drift-detector
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+    paths: ["**/*.oas.yaml"]
+  schedule:
+    - cron: "0 9 * * 1"   # Mondays 09:00 UTC
+  workflow_dispatch:
+
+jobs:
+  detect:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+      issues: write
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Install deps
+        run: pip install pyyaml
+
+      # ── PR mode: diff each changed spec file (base..head) ───────────────
+      - name: PR diff
+        if: github.event_name == 'pull_request'
+        run: |
+          BASE='${{ github.event.pull_request.base.sha }}'
+          HEAD='${{ github.event.pull_request.head.sha }}'
+          CHANGED=$(git diff --name-only "$BASE" "$HEAD" -- '**/*.oas.yaml')
+          python - "$BASE" "$HEAD" $CHANGED <<'PY'
+          import json, sys, os
+          sys.path.insert(0, ".github/scripts")
+          import extract_spec_diff as e
+          base_ref, head_ref = sys.argv[1], sys.argv[2]
+          all_changes = []
+          for path in sys.argv[3:]:
+              b = e.load(e.git_show(base_ref, path))
+              h = e.load(e.git_show(head_ref, path))
+              svc = "_".join(os.path.basename(path).split("_")[:-1])  # db_data_2025-10.oas.yaml -> db_data
+              cs = e.diff(b, h)
+              for c in cs:
+                  c["service"] = svc
+                  c["version"] = path
+              all_changes += cs
+          json.dump(all_changes, open("spec-diff.json", "w"), indent=2)
+          print(f"{len(all_changes)} changes across changed specs")
+          PY
+
+      # ── Scheduled/manual: diff the two newest version dirs ──────────────
+      - name: Version-snapshot diff
+        if: github.event_name == 'schedule' || github.event_name == 'workflow_dispatch'
+        run: |
+          python - <<'PY'
+          import glob, os, re, json, sys
+          sys.path.insert(0, ".github/scripts")
+          import extract_spec_diff as e
+          dirs = sorted([d for d in os.listdir(".") if re.fullmatch(r"\d{4}-\d{2}", d)], reverse=True)
+          if len(dirs) < 2:
+              json.dump([], open("spec-diff.json", "w")); print("need two version dirs"); raise SystemExit(0)
+          head_dir, base_dir = dirs[0], dirs[1]
+          all_changes = []
+          for hf in glob.glob(f"{head_dir}/*.oas.yaml"):
+              svc = "_".join(os.path.basename(hf).split("_")[:-1])  # strip trailing _<version>
+              matches = glob.glob(f"{base_dir}/{svc}_*.oas.yaml")
+              b = e.load(open(matches[0]).read()) if matches else {}
+              h = e.load(open(hf).read())
+              cs = e.diff(b, h)
+              for c in cs:
+                  c["service"] = svc
+                  c["version"] = head_dir
+              all_changes += cs
+          json.dump(all_changes, open("spec-diff.json", "w"), indent=2)
+          print(f"{base_dir} -> {head_dir}: {len(all_changes)} changes")
+          PY
+
+      - name: Check coverage
+        id: cov
+        run: |
+          python .github/scripts/check_spec_coverage.py \
+            --spec-diff spec-diff.json \
+            --manifest .github/spec-manifest.json \
+            --output spec-gaps.json
+
+      - name: Comment on PR
+        if: github.event_name == 'pull_request' && steps.cov.outputs.has_gaps == 'true'
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const fs = require('fs')
+            const gaps = JSON.parse(fs.readFileSync('spec-gaps.json', 'utf8'))
+            const breaking = gaps.filter(g => g.breaking)
+            const seen = new Set()
+            const byPage = {}
+            for (const g of gaps) {
+              const key = `${g.symbol}|${g.doc_page}`
+              if (seen.has(key)) continue; seen.add(key)
+              ;(byPage[g.doc_page] = byPage[g.doc_page] || []).push(g)
+            }
+            const sdks = [...new Set(gaps.flatMap(g => g.sdks))].sort()
+            const lines = ['## Spec drift detected', '', 'This PR changes the OpenAPI surface. Likely doc/SDK impact:', '']
+            if (breaking.length) {
+              lines.push('### ⚠️ Breaking changes')
+              const bseen = new Set()
+              for (const g of breaking) {
+                const key = `${g.symbol}|${g.detail}`
+                if (bseen.has(key)) continue; bseen.add(key)
+                lines.push(`- \`${g.symbol}\` — ${g.detail}`)
+              }
+              lines.push('')
+            }
+            lines.push('### Pages to update')
+            for (const [page, items] of Object.entries(byPage)) {
+              lines.push(`**\`${page}\`**`)
+              for (const g of items) lines.push(`- [ ] \`${g.symbol}\` (${g.change})${g.breaking ? ' ⚠️' : ''}: ${g.detail}`)
+              lines.push('')
+            }
+            if (sdks.length) lines.push(`**Impacted SDKs:** ${sdks.join(', ')}`)
+            lines.push('', '_Auto-detected. Dismiss when docs are updated, or close if not applicable._')
+            await github.rest.issues.createComment({
+              owner: context.repo.owner, repo: context.repo.repo,
+              issue_number: context.issue.number, body: lines.join('\n'),
+            })
+
+      - name: Open docs stub PR
+        if: >
+          (github.event_name == 'schedule' || github.event_name == 'workflow_dispatch')
+          && steps.cov.outputs.has_gaps == 'true'
+        env:
+          DOCS_TOKEN: ${{ secrets.DOCS_GITHUB_TOKEN }}
+        run: |
+          python .github/scripts/open_docs_stub_pr.py \
+            --gaps spec-gaps.json \
+            --docs-repo pinecone-io/docs \
+            --token "$DOCS_TOKEN"