meta-mcp-server

A Model Context Protocol server for the Meta Graph API — Facebook Pages and linked Instagram Business accounts.

MIT licensed.

Install

npm install -g @nasdigitaluk/meta-mcp

Configuration

{
  "env": {
    "META_PAGE_ACCESS_TOKEN": "your-page-token",
    "META_PAGE_ID": "1234567890",
    "META_IG_USER_ID": "17841400000000000"
  }
}

META_IG_ACCESS_TOKEN is optional — it defaults to the Page token, which is correct when the Instagram account is linked to that Page. The ids are optional too; they just default the arguments.

A long-lived Page token can be obtained through the Graph API Explorer and then exchanged, which is far less work than a full OAuth flow for a single account.

⚠️ Do not reason from the token's scope list

This is the finding worth carrying away, because it is wrong in both directions:

Verified live. Every Page read endpoint (/{page}/feed, /me/feed, and by extension /{post}/comments) returns:

(#10) This endpoint requires the 'pages_read_engagement' permission or the 'Page Public Content Access' feature

…while debug_token lists that permission among the token's scopes. Granted but not effective, which points at App Review rather than at re-authorising.

Meanwhile a probe against POST /{post}/comments returned (#100) Invalid post_id parameter — it cleared the permission check and failed only on the deliberately fake id.

Writing works; reading it back does not. Trusting the scope list would have shipped the read tool and skipped the write — exactly backwards.

Two consequences here:

• there is no read-comments tool, because it would always fail;

• a successful meta_create_post_comment is your only confirmation, and the tool says so.

⚠️ Tokens go in a header, not the URL

Meta's own examples put access_token=... in the query string. That puts the credential in access logs, proxy logs and browser history on every request. Here they are Authorization: Bearer headers, and there is a test asserting no request URL contains access_token.

Instagram publishing waits properly

Publishing to Instagram is two calls: create a media container, then publish it. Meta fetches and processes your media server-side, so publishing immediately is a race — and video loses it far more often than a photo.

The server this replaces published straight away with no wait at all. This one polls the container's status_code:

• publishes as soon as it reports FINISHED;

• refuses to publish one reporting ERROR or EXPIRED;

• is bounded by attempts as well as by the clock, so a fast status endpoint cannot become a request storm;

• falls back to publishing after the budget if status_code never appears, so a container type that does not report status is no worse off than before.

Instagram's Content Publishing API takes a public http(s) URL that Meta fetches, not a file upload. A local path can never work, so it is rejected at validation rather than sixty seconds later.

Tools

The Page and Instagram tokens are kept apart — they are different tokens with different reach, and using the wrong one fails in a way that reads like a missing permission. meta_call takes an as argument so you can pick.

What is NOT covered

Meta publishes no machine-readable spec for the Graph API, and much of it is gated behind App Review in ways the scope list does not reflect. So this server does not claim complete coverage: it wraps what is verified working and offers meta_call as a documented passthrough for the rest.

Read-only and no-destructive modes

MCP_READ_ONLY=1       refuse anything that changes state
MCP_NO_DESTRUCTIVE=1  allow posting, refuse the generic caller

Testing

npm test                                                # 11 tests
SMOKE_ENV='{"META_PAGE_ACCESS_TOKEN":"x"}' npm run smoke    # real MCP over stdio

Built on

@nasdigitaluk/mcp-server-core.

Licence

MIT.