deadends.dev

Error knowledge database for AI coding agents.

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What it can do

  • Lookup Error: Match an error message against deadends.dev's database of known errors. Returns dead ends (what NOT to try), workarounds (what works), and error chains (what comes next).
  • Get Error Detail: Get full details for a specific error by its ID (e.g., 'python/modulenotfounderror/py311-linux').
  • List Error Domains: List all error domains and counts in the deadends.dev database.

What data it sees

Do you need an account

No: the server works without sign-in

Error knowledge database for AI coding agents. 2002 verified error patterns across 43 domains. Returns dead ends (what NOT to try) and workarounds (what works) for any error message. Covers Python, Node, Docker, CUDA, Kubernetes, ROS 2, PyTorch, and 36 more domains.

How to connect

How to connect deadends.dev to Claude

The server address to paste into Claude settings:

https://deadends-dev--deadend.run.tools

  1. Open Claude (claude.ai or the desktop app).
  2. Go to Settings → Connectors.
  3. Click Add custom connector.
  4. Paste the server address copied below into Remote MCP server URL and click Add.
  5. In a chat, click + → Connectors and switch the new connector on.

Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

Authorization

After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

How to connect deadends.dev to ChatGPT

The server address to paste into ChatGPT settings:

https://deadends-dev--deadend.run.tools

  1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
  2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
  3. Open Settings → Connectors and click Create.
  4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
  5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
  6. In a new chat open + → Apps/Connectors and enable the connector.

OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

Authorization

On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

How to connect deadends.dev to Cursor

The server address to paste into Cursor settings:

https://deadends-dev--deadend.run.tools

Fastest: click Open in Cursor below and confirm the prompt.

Manually:

  1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
  2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
  3. Save the file. The server appears in the MCP list; authorize it there if asked.

Authorization

If the service needs sign-in, an authorize button appears next to the server in the MCP list.

Server tool list (8)

Raw names from tools/list. Only developers need these.

lookup_errorMatch an error message against deadends.dev's database of known errors. Returns dead ends (what NOT to try), workarounds (what works), and error chains (what comes next).
get_error_detailGet full details for a specific error by its ID (e.g., 'python/modulenotfounderror/py311-linux').
list_error_domainsList all error domains and counts in the deadends.dev database.
search_errorsSearch errors by keyword across all domains. Uses fuzzy keyword search.
list_errors_by_domainList all errors in a specific domain with their fix rates.
batch_lookupLook up multiple error messages at once. Returns the best match for each error.
get_domain_statsGet detailed statistics for a domain: error counts, average fix rate, resolvability breakdown.
get_error_chainTraverse the error transition graph for a specific error. Shows leads_to, preceded_by, and frequently_confused_with.