MCP.Market

Failmodes MCP server

online · 100% uptime
by elyngved·io.github.elyngved/failmodes·v0.1.0
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MCP server for the Fail Modes taxonomy — a knowledge base of AI system failure modes

A90/100grade A
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Safety scan
A90/100

full report

Adoption
Growing

0 stars35 downloads/wk

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Failmodes tools (4)

write = sends, deletes, buys or posts
  • get_failure_modeFree

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

  • list_categoriesFree

    List all taxonomy categories with their IDs, names, descriptions, and mode counts.

  • list_modesFree

    List failure modes, optionally filtered to a single category by category ID.

  • search_failure_modesFree

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

Public scan report

scanner v0.1.9 · 2026-09-26 · same rubric, same numbers if you re-run it

no findings
  • Code scan5 source files scanned25/25
  • Live reliabilityremote reachable in 550ms20/20
  • Tool poisoning4 tool descriptions checked15/15
  • Auth qualityopen endpoint, read-only tools10/15
  • Maintenancelast push 83 days ago12/15
  • Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10
Overall 90/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Failmodes compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
90/100
higher than 83% of 48,255 servers
Tools
4
the typical server has 7
Tools that change things
0%
typical: 0%. Fewer write tools means less an agent can break
Uptime
100%
of our recent checks; the typical remote server answers 100%
Response time
361 ms
faster than 41% of 30,031 servers
Downloads a week
35
more than 25% of 12,191 servers with a package

What its tools let an agent do: 4 read

Install Failmodes in Claude Code, Cursor or VS Code

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

What the publisher says

From the Failmodes repository's README, as published. We do not edit it. Read it on GitHub

failmodes-mcp

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

Provides four tools over 100+ canonical failure mode records spanning factuality, alignment, planning, code generation, instruction following, and more.

Tools

Quick Start

No installation required — run directly with npx:

npx failmodes-mcp

Configuration

Claude Desktop

Add to ~/Library/Application Support/Claude/claudedesktopconfig.json (macOS) or %APPDATA%\Claude\claudedesktopconfig.json (Windows):

{
  "mcpServers": {
    "failmodes": {
      "command": "npx",
      "args": ["-y", "failmodes-mcp"]
    }
  }
}

Cursor / VS Code

Add to your MCP settings file:

{
  "mcpServers": {
    "failmodes": {
      "command": "npx",
      "args": ["-y", "failmodes-mcp"]
    }
  }
}

Remote (no install required)

A hosted Streamable HTTP version is also available — no npm package needed:

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

How It Works

On first tool call, the server fetches current taxonomy data from failmodes.com and caches it in memory for the duration of the session. Requires internet access.

The stdio transport makes this compatible with any MCP client that supports running local processes (Claude Desktop, Cursor, VS Code, etc.).

Links

  • Taxonomy source: github.com/elyngved/failmodes-taxonomy
  • Website: failmodes.com
  • Remote MCP manifest: failmodes.com/server.json

License

MIT

Nothing above is checked by us. What we check is on the safety report.

Failmodes: common questions

Is Failmodes MCP server safe?
Yes, by our scan: it is graded A (90/100). Read the Failmodes safety report
How do I install Failmodes?
It runs remotely at www.failmodes.com. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
Does Failmodes need an API key?
Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is Failmodes maintained?
The last commit was 122 days ago (2026-07-05). The latest release is v0.1.0.
Is Failmodes up?
100% of our last 28 checks got an answer. We check remote servers about four times a day.
How does Failmodes compare with other MCP servers?
safety score 90/100 (higher than 83% of 48,255 servers); tools 4 (the typical server has 7); tools that change things 0% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.