io.github.diffbot/diffbot-mcp

Diffbot

Is the Diffbot MCP server down? No. It is up and needs auth (HTTP 401), probed 2026-11-14.

Web search, page extraction, crawling, and Knowledge Graph queries from Diffbot's web index.

needs auth probed 2026-11-14 · HTTP 401 · Bearer

12tools, from the package diffbot-mcp

7.2ktokens in Claude Opus 5.5

3.6 %of Claude's 200k window

The server needs auth, so these tool definitions were read from the publisher's open-source package pypi:diffbot-mcp, started in a container with placeholder values and the network off, on 2026-11-14. Tool definitions do not depend on the token, so this is what an authorized user loads, unless the server hides tools by plan or role.

Streamable HTTP error: Error POSTing to endpoint:

Endpoint: https://mcp.diffbot.com/mcp (streamable-http)
Host: mcp.diffbot.com
Of a 1M window: 0.7 % of a 1M context window
Getting access: OAuth with dynamic client registration. A client such as Claude Code, Cursor or npx mcpcost auth https://mcp.diffbot.com/mcp registers itself and opens the consent page; the publisher has nothing to set up for you.
Authorization server app.diffbot.com, PKCE S256, grants authorization_code, refresh_token.
Scopes mcp.
Read from the server's public OAuth metadata, without a token. Method.
Repository: https://github.com/diffbot/diffbot-mcp
Website: https://www.diffbot.com
Registry: active, updated 2026-11-10 · registry entry

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Badge for the README

The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.

Atom feed

A mail when this server changes

Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.

For the publisher

The server answers HTTP 401 to an unauthenticated initialize, so the probe cannot list its tools. That is correct for a private server. Some public servers answer initialize and tools/list without credentials and ask for auth on tool calls only; those get a token count here.

Fixed something? Probe it now, with the same steps as the daily run. This page updates with the next daily run.