pinterest-mcp

A minimal Model Context Protocol server for the Pinterest API v5. Reads boards/pins/analytics; publishes new pins and boards. Built for a multi-agent fleet where a human must sign off before anything reaches the public account.

Setup

npm install
npm run build

Requires a Pinterest Developer App (https://developers.pinterest.com/apps/) with a registered redirect URI of http://localhost:3034/oauth/redirect. Note the App ID and App Secret.

Getting a token

PINTEREST_APP_ID=<id> PINTEREST_APP_SECRET=<secret> \
  PINTEREST_CREDENTIALS_FILE=/home/you/.openclaw/credentials/pinterest.env \
  node scripts/get-pinterest-token.mjs

Approve in the browser. The script writes PINTEREST_APP_ID, PINTEREST_APP_SECRET, PINTEREST_ACCESS_TOKEN, PINTEREST_REFRESH_TOKEN, PINTEREST_TOKEN_EXPIRES_AT into the file (mode 0600). Tokens are deliberately not printed.

Pass --port <n> if 3034 is taken (register the matching redirect URI in the Pinterest app). The listener binds before printing the authorize URL, so an occupied port fails loudly rather than burning the one-time auth code.

Configuration

{
  "mcpServers": {
    "pinterest": {
      "command": "node",
      "args": ["/path/to/pinterest-mcp/dist/index.js"],
      "env": {
        "PINTEREST_CREDENTIALS_FILE": "/home/you/.openclaw/credentials/pinterest.env"
      }
    }
  }
}

The server rewrites PINTEREST_ACCESS_TOKEN / PINTEREST_TOKEN_EXPIRES_AT in that file when it refreshes (Pinterest access tokens expire after ~30 days). OpenClaw's MCP config bakes env vars at mcp add time and cannot rewrite them; the file it points at can be rewritten — same pattern as x-mcp.

Related MCP server: mcp-reddit-publisher

Available tools

Write tools require agent_id (must hold the social capability) and task_id (task must be Done and carry at least one approved output; brand must match PINTEREST_SERVER_BRAND, default with_nate). Both are ordinary refusals, not crashes — a gate rejection returns isError: true with a readable message.

Pinterest-specific gotchas

• Trial mode. A fresh Pinterest Developer app starts in trial mode, limited to the app owner's own account. That is its own safety net for a first-time integration — write scope cannot touch anyone else's account until the app is submitted for review and approved for standard access.

• Access-token rotation. Tokens expire in ~30 days; the server refreshes proactively via POST /v5/oauth/token with grant_type=refresh_token. The refresh token itself usually persists but is written back to the credentials file if Pinterest ever rotates it.

• image_url must be publicly reachable. Pinterest fetches the image server-side. A local filesystem path (e.g. a MUSE-generated PNG under /mnt/d/Fleet/...) will fail — the file has to be hosted somewhere public first, or uploaded via Pinterest's separate POST /v5/media flow (not implemented in this first version).

• Put the destination URL in link, not description. The link field is what pinterest_get_pin_analytics counts outbound clicks against. For Etsy promotion the Etsy listing URL goes there.

• PNG or JPEG. Other formats are rejected by Pinterest at pin-create time.

Security model: agent_id capability gating + brand + publish-clearance

OpenClaw doesn't propagate per-agent caller identity down to MCP tool calls in this version (all agents share the same MCP process — confirmed platform limitation, openclaw/openclaw#67682). Write tools ask the fleet board's own capability record for the caller before doing anything, via GET /agents/{id}/capabilities at FLEET_BOARD_URL (default http://127.0.0.1:8420).

A second call — GET /tasks/{id}/publish-clearance?brand=<brand> — proves both the task's brand matches this server AND that a human has actually closed the task with an approved output. Same endpoint every outward server uses; the board owns the rule.

Honest limitations:

• agent_id is self-reported by the caller, not cryptographically bound. This turns a silent wrong-agent action into a loud, rejected, auditable one — it does not stop a determined actor from lying.

• The clearance gate is defence in depth. The load-bearing rule is that the board's own fan-out (BRAND_CHANNELS in pickup.py) decides whether a publishing subtask is ever created. This gate catches an agent reaching for the tool outside that flow.

Standalone use: either stand up a minimal service at FLEET_BOARD_URL returning a JSON string array for GET /agents/{id}/capabilities and a {cleared: bool, reasons: string[]} for GET /tasks/{id}/publish-clearance, or remove the requireCapability / requireBrand calls from src/index.ts.

Deliberately not exposed

• Deleting a pin (DELETE /v5/pins/{pin_id}). An unreviewed retraction of live content is a real, unrecoverable outward action. Deletions stay with Nathan, via the Pinterest app.

• Deleting a board. Same reason.

• Follows / reactions. Social actions belong behind an explicit ECHO decision, not incidentally callable.

Notes on safety

• Every request goes to api.pinterest.com or www.pinterest.com only — no telemetry, no third-party calls, no dynamic code execution.

• Credentials live in a mode-0600 file rewritten in place. Tokens are never printed by either the server or the OAuth catcher.

License

MIT — see LICENSE.