failmodes is a remote MCP server that gives an AI agent 4 tools, among them get_failure_mode, list_categories, list_modes. It answers at https://www.failmodes.com/api/mcp over streamable HTTP, and it listed its tools to an anonymous client, so no sign-in was needed for that. Our probes reached it 10 of 10 times since 5 September 2026; the last check, on 18 October 2026, succeeded.
MCP server for the Fail Modes taxonomy — a knowledge base of AI system failure modes
Description as the publisher wrote it.
| Tool | What it does |
|---|---|
get_failure_mode | Retrieve the full structured record for a single failure mode by its ID slug (e.g. 'citation-hallucination', 'sycophancy'). Inputs: id |
list_categories | List all taxonomy categories with their IDs, names, descriptions, and mode counts. |
list_modes | List failure modes, optionally filtered to a single category by category ID. Inputs: category |
search_failure_modes | Search the Fail Modes taxonomy by symptom text or keyword phrase. Returns ranked matches with id, name, category, and matched context. Inputs: symptom |
Every block below points at https://www.failmodes.com/api/mcp. Pick your client and copy.
claude mcp add --transport http failmodes https://www.failmodes.com/api/mcp
{
"mcpServers": {
"failmodes": {
"command": "npx",
"args": ["-y", "mcp-remote", "https://www.failmodes.com/api/mcp"]
}
}
}{
"mcpServers": {
"failmodes": {
"url": "https://www.failmodes.com/api/mcp"
}
}
}{
"servers": {
"failmodes": {
"type": "http",
"url": "https://www.failmodes.com/api/mcp"
}
}
}{
"context_servers": {
"failmodes": {
"url": "https://www.failmodes.com/api/mcp"
}
}
}{
"mcpServers": {
"failmodes": {
"serverUrl": "https://www.failmodes.com/api/mcp"
}
}
}{
"mcpServers": {
"failmodes": {
"url": "https://www.failmodes.com/api/mcp"
}
}
}name: failmodes
version: 0.0.1
schema: v1
mcpServers:
- name: failmodes
type: streamable-http
url: https://www.failmodes.com/api/mcp{
"mcpServers": {
"failmodes": {
"httpUrl": "https://www.failmodes.com/api/mcp"
}
}
}{
"mcpServers": {
"failmodes": {
"type": "http",
"url": "https://www.failmodes.com/api/mcp"
}
}
}{
"mcpServers": {
"failmodes": {
"url": "https://www.failmodes.com/api/mcp"
}
}
}goose://extension?url=https%3A%2F%2Fwww.failmodes.com%2Fapi%2Fmcp&type=streamable_http&id=failmodes&name=failmodes
It answered our last check on 18 October 2026 in 228 ms. Over 10 checks since 5 September 2026 it answered 10. Status here comes from Neuronto's own probes, not from the publisher.
4, as returned by the server's own tools/list on 31 August 2026: get_failure_mode, list_categories, list_modes, search_failure_modes.
It answered our last check on 18 October 2026 in 228 ms. Over 10 checks since 5 September 2026 it answered 10.
Put the server under mcpServers in ~/.cursor/mcp.json with the URL https://www.failmodes.com/api/mcp. The exact JSON is above, with the same setup for Claude Code, Claude Desktop, VS Code, Windsurf, Zed, Gemini CLI and the rest.
It listed its tools to an anonymous client, so reading the tool list needs no key. Individual tools can still ask for credentials in their own inputs.
Publisher: io.github.elyngved. Endpoint host: www.failmodes.com. ARD identifier: urn:air:io.github.elyngved:mcp:failmodes.
First indexed 31 August 2026. The tools are exactly what the server returned; nothing on this page
is inferred from its name. Ranking in Neuronto search is never for sale.