diff --git a/README.md b/README.md
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@@ -240,6 +240,15 @@ Beyond the slash-command skills, gstack ships standalone CLIs for workflows that
 
 Set `gstack-config set checkpoint_mode continuous` and skills auto-commit your work as you go with a `WIP:` prefix plus a structured `[gstack-context]` body (decisions, remaining work, failed approaches). Survives crashes and context switches. `/context-restore` reads those commits to reconstruct session state. `/ship` filter-squashes WIP commits before the PR (preserving non-WIP commits) so bisect stays clean. Push is opt-in via `checkpoint_push=true` — default is local-only so you don't trigger CI on every WIP commit.
 
+### Domain skills + raw CDP escape hatch
+
+Two new browser primitives compound the gstack agent over time:
+
+- **`$B domain-skill save`** — agent saves a per-site note (e.g., "LinkedIn's Apply button lives in an iframe") that fires automatically next time it visits that hostname. Quarantined → active after 3 successful uses → optional cross-project promotion via `$B domain-skill promote-to-global`. Storage lives alongside `/learn`'s per-project learnings file. Full reference: **[docs/domain-skills.md](docs/domain-skills.md)**.
+- **`$B cdp <Domain.method>`** — raw Chrome DevTools Protocol escape hatch for the rare case curated commands miss. Deny-default: methods must be explicitly added to `browse/src/cdp-allowlist.ts` with a one-line justification. Two-tier mutex serializes browser-scoped CDP calls against per-tab work. Output for data-exfil methods is wrapped in the UNTRUSTED envelope.
+
+> Want raw CDP with no rails, no allowlist, no daemon — just thin transport from agent to Chrome? [browser-use/browser-harness-js](https://github.com/browser-use/browser-harness-js) is a different philosophy (agent-authored helpers vs gstack's curated commands) and a good fit if you don't want gstack's security stack. The two can coexist: gstack's `$B cdp` and harness can both attach to the same Chrome via Playwright's `newCDPSession`.
+
 **[Deep dives with examples and philosophy for every skill →](docs/skills.md)**
 
 ### Karpathy's four failure modes? Already covered.