feat(third_party): add Clarify plugin

[patrickt010]

Summary

• Add Clarify (the AI-native CRM) as a third_party/ marketplace plugin, in the Attio (Add Attio third-party MCP plugin #339) / Hunter (Add Hunter third-party MCP plugin (API key header auth) #340) shape.
• Direct submission from the Clarify team; connects to Clarify's own hosted remote MCP server over Streamable HTTP.
• Registers the plugin in .cursor-plugin/marketplace.json.
• URL-only OAuth — no CLIENT_ID/CLIENT_SECRET variables needed; the authorization server supports dynamic client registration.
• Based on main.

Endpoint	https://api.clarify.ai/mcp
Auth	OAuth with dynamic client registration. Probed: 401 → protected-resource metadata advertises authorization server auth1.clarify.ai and scopes openid profile email offline_access; AS exposes registration_endpoint (/oauth2/register) with PKCE S256 and authorization_code + refresh_token grants.
Tools	records/objects, lists, Lead Finder, campaigns & email, calendar & meetings, agents & workflows, artifacts, analytics, attachments. The hosted runtime is the source of truth; a workspace sees a feature-filtered view.

MCP

{
  "mcpServers": {
    "clarify": {
      "type": "http",
      "url": "https://api.clarify.ai/mcp"
    }
  }
}

Files

• third_party/clarify/.cursor-plugin/plugin.json, mcp.json
• third_party/clarify/README.md, CHANGELOG.md, LICENSE
• third_party/clarify/assets/logo.png (192×192, Clarify's official app mark)

Verification

• node scripts/validate-plugins.mjs → All plugins validated successfully.
• File set mirrors third_party/attio/.

---

Note

Low Risk
Marketplace manifest and documentation-only plugin wiring with no changes to core app logic, auth flows, or database access in this repo.

Overview
Adds Clarify as a new third_party/clarify marketplace plugin so Cursor agents can reach Clarify’s CRM via a hosted remote MCP server at https://api.clarify.ai/mcp.

The change registers clarify in .cursor-plugin/marketplace.json and the root plugin table in README.md, and ships the usual plugin bundle: .cursor-plugin/plugin.json, mcp.json (HTTP MCP only—no local stdio wrapper), docs, changelog, MIT license, and logo. Auth is documented as OAuth user login with no API keys in the manifest.

This mirrors other CRM-style third-party entries (e.g. Attio): configuration is mostly wiring the remote endpoint; tool behavior lives on Clarify’s hosted runtime.

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