# deadends.dev — software development services — 1 of 5

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> Probe-verified (tier 2 of 3). Last checked 2026-09-26. 1 of 5 capability checks passed. 2 unknown.

- host: deadends.dev
- url: https://deadends.dev/
- category: software development services
- type: business
- language: en

## Probe-verified · tier 2 of 3

Probed live on 2026-09-26 against rubric v1.2. 1 of 5 checks passed. 2 unknown.

- UNKNOWN — Markdown negotiation (`Accept: text/markdown`)
- UNKNOWN — Markdown twin at a predictable URL (`/page.md`)
- PASS — llms.txt (`/llms.txt`)
- FAIL — API catalog (`RFC 9727`)
- FAIL — MCP endpoint answers tools/list (`initialize → tools/list, no credentials`)
  - DEAD — MCP server card (`/.well-known/mcp/server-card.json`): dead; points at a server that did not answer; not scored
  - Platform-supplied: not applicable — no MCP endpoint answered; not scored
- FAIL — Other agent files at well-known paths (`agent-skills/index.json · oauth-authorization-server · oauth-protected-resource · http-message-signatures-directory`): none found; not scored

## Summary

Structured error knowledge database with 2725 error patterns across 54 domains including android, api, aws, banking, cloud, docker, python, security, and visa. Provides dead ends, workarounds with success rates, and error transition graphs for AI coding agents and developers.

## Context

2370 sites in this index share the category "software development services"; 246 are transactional.

## How we grade

- tier 1 — **Declared**: The site says agents are welcome in its robots.txt. A permission, not a capability.
- tier 2 — **Probe-verified** (this site): We fetched the site and tested each signal ourselves. Dated, repeatable, re-checked on a schedule.
- tier 3 — **Behaviourally verified**: An agent completed the action end to end — booked, bought, submitted — and it worked.

## About this record

Known Good probes sites live and publishes what was tested and when.
Method: https://knowngood.sh/about.md · Rubric: https://knowngood.sh/benchmark

How we found this site: probe discovery. This site didn't declare agent access — we found it by checking the open web. Everything above was tested the same way, against the same rubric, on the date shown. [How we choose what to check, and how to opt out](https://knowngood.sh/bot)

## Where this sits

- business: https://knowngood.sh/type/business
- software development services: https://knowngood.sh/category/software-development-services
- Browse: https://knowngood.sh/browse
- Rubric: https://knowngood.sh/benchmark