Failmodes MCP Server

by elyngved Your server? Claim it

not responding

Failmodes is listed as active in the registry but did not answer our last check. 29 installs a week from npm. It exposes 4 tools. Last commit 5 Jul 2026.

MCP server for the Fail Modes taxonomy — a knowledge base of AI system failure modes

Installs per day peak 138 · avg 10 · -11% w/w

a month agotoday

Uptime history 51 days of history · worst day 0%

51 days agonow

2.2%

Uptime 24h

2 of 91 checks

Tools

read from the server

481 ms

Response time

average over 24h

Installs / week

npm and PyPI

Failmodes does not always answer

Over the last week it answered 3.9% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 2 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add failmodes --transport http https://www.failmodes.com/api/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "failmodes": {
      "url": "https://www.failmodes.com/api/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.failmodes]
url = "https://www.failmodes.com/api/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "failmodes": {
      "url": "https://www.failmodes.com/api/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "failmodes": {
      "url": "https://www.failmodes.com/api/mcp"
    }
  }
}

Available tools 4

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

failure

get_failure_mode

Retrieve the full structured record for a single failure mode by its ID slug (e.g. 'citation-hallucination', 'sycophancy').

search_failure_modes

Search the Fail Modes taxonomy by symptom text or keyword phrase. Returns ranked matches with id, name, category, and matched context.

Endpoints

URL	Transport	State	Latency	Checked
https://www.failmodes.com/api/mcp	streamable-http	answering	332 ms	2 min ago

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Failmodes — questions

Answers built from our own checks of this server.

What can Failmodes do?

It exposes 4 tools, read directly from the server on our last check. Among them: get_failure_mode, list_categories, list_modes, search_failure_modes. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Failmodes working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 2 of 91 checks got a reply (2.2%), average response time 481 ms. The bar chart above shows every period we have measured.

The registry lists Failmodes as active — why does it not respond?

The official MCP registry stores what the author submitted; it does not verify that the server still runs. We check the endpoint ourselves, and this one does not answer. Catalogues that copy the registry without checking will show it as working.

How do I connect Failmodes?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Failmodes need an API key?

No. Failmodes completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 4 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Failmodes?

It answers our handshake in 481 ms on average, which is faster than 32% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.

How many people use Failmodes?

The npm package failmodes-mcp was installed 29 times in the last week. Week over week that is -11%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.

Is Failmodes open source?

Yes — it is published under the MIT licence, written in JavaScript and 0 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.