Agent 404
In short
A 404 response written for agents, often markdown, that links the index and similar pages so the agent can recover. Example: ReadMe returns a markdown 404 with agentTools front matter for missing .md pages. Related terms: Real status code, Soft 404, Agent score (docs), AFDocs.
Source of the example
The example in the summary above is from docs.readme.com, read 4 November 2026.
Where it shows up on this site
Neighbouring terms
- Real status code: An HTTP status that matches what happened: 200 for a page, 404 for a missing path, 429 for throttling.
- Soft 404: A missing page that returns 200 with an error message in the body.
- Agent score (docs): A docs-specific readiness score computed from AFDocs-style checks, published by docs vendors.
- AFDocs: The Agent-Friendly Documentation spec and its open-source checker, used by Mintlify, ReadMe and GitBook docs scores.
Sources
- docs.readme.com https://docs.readme.com/main/docs/llmstxt, read 4 November 2026
Last reviewed 4 November 2026