MCP server

Failmodes

io.github.elyngved/failmodes

Checked 25 Oct 2026, 20:29 UTC · Connected to it and listed its tools

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

Working at last checkAbout 409 tokens per request once connected4 tools

https://www.failmodes.com/api/mcp

At a glance

Type: MCP server
Publisher: Not verified
Status: Working at last check
Tools: 4
Token cost: About 409 tokens per request
Sets up in: Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok
Last checked: 25 Oct 2026, 20:29 UTC

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

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

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

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

Gemini CLI

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

Cursor

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

VS Code

{"servers":{"failmodes":{"type":"http","url":"https://www.failmodes.com/api/mcp"}}}

Antigravity

agy mcp add failmodes https://www.failmodes.com/api/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"failmodes","server_url":"https://www.failmodes.com/api/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"failmodes","server_url":"https://www.failmodes.com/api/mcp"}

get_failure_mode ~113 tokens
Retrieve the full structured record for a single failure mode by its ID slug (e.g. 'citation-hallucination', 'sycophancy').
list_categories ~65 tokens
List all taxonomy categories with their IDs, names, descriptions, and mode counts.
list_modes ~97 tokens
List failure modes, optionally filtered to a single category by category ID.
search_failure_modes ~134 tokens
Search the Fail Modes taxonomy by symptom text or keyword phrase. Returns ranked matches with id, name, category, and matched context.

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