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## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work. > - Apps give agents governed access to external tools through catalog connectors. > - The connector playbook is the repeatable template for adding such connectors. > - Notion just shipped as the first MCP-direct connector with RFC 7591 dynamic client registration (#11009). > - The playbook had no guidance for MCP-direct connections, OAuth discovery, or DCR. > - This pull request documents that path and encodes three mandatory standards into the connector template. > - It also adds a Notion dry-run appendix recorded from the live probe and the shipped implementation. > - The benefit is that the next MCP-direct connector follows a recorded, verified path. > [!IMPORTANT] > **Depends on #11009.** This PR documents the Notion MCP connector that ships in #11009 (RFC 7591 DCR, discovery-first endpoints, `redirectConstraints` enforcement, refresh-rotation hardening). Reviewing this doc against master before #11009 merges will show the documented behavior as "not implemented" — that is expected. Draft until #11009 lands, then re-review. ## What Changed `doc/connections/CONNECTOR-PLAYBOOK.md` only (+364 lines, no code): - New **"MCP-Direct Connections"** section: RFC 9728/8414 endpoint discovery chain, an **RFC 7591 dynamic client registration** subsection (public client, PKCE S256, env-client precedence, persist-and-reuse), and a **redirect-URI constraints** subsection (`https-or-loopback-http`, fail-fast wizard error). - Three mandatory documentation standards encoded into the connector template itself: a service-involvement statement (DCR providers need neither Paperclip ID nor Paperclip Connect — instance-local per the PAP-14828 spec §10 item 8.4; cloud and self-hosted use the same path), a required **Connection Flow** section (sequence diagram + exact authorize/token/registration/callback endpoints), and a required **Administrator Setup** section. - A **Notion dry-run appendix** mirroring the Linear appendix, recorded from the live PAP-16649 probe: verified request sequence, redirect-URI probe results table, sequence diagram (mermaid), shipped manifest sketch, representative tool risk classes, admin setup (nothing to register), governance defaults, and validation hooks. ## Verification - Docs-only change; no code paths affected. `git diff --stat` shows exactly one file. - Every endpoint, error code, and constraint in the appendix was checked against the shipped implementation on the #11009 head: `server/src/services/tool-access.ts` (`assertOAuthRedirectConstraints`, DCR registration metadata, refresh serialization), `server/src/routes/tool-access.ts` (`POST /api/tools/oauth/:connectionId/start`, `GET /api/tools/oauth/callback`), and `packages/shared/src/app-definitions/notion.json` (`redirectConstraints: "https-or-loopback-http"`). - The request log mirrors the live probe record from PAP-16649 (2026-08-06/07), not vendor docs alone. - Mermaid source renders cleanly (rendered PNG attached to PAP-16653). ## Risks - Low: documentation only. Main risk is doc/implementation drift if #11009 changes before merging — mitigated by the dependency note above and re-review after #11009 lands. - The template changes add mandatory sections for future connector proposals; existing proposals are not retroactively invalidated. ## Model Used Claude Fable 5 (claude-fable-5). ## Linked Issues or Issue Description PAP-16653 (parent PAP-16637 P5). Companion catalog package landed in paperclip-content (`integrations/catalog/platforms/notion/areas/mcp/`). 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Co-authored-by: Claude Fable 5 <noreply@anthropic.com>