security.txt
A file at /.well-known/security.txt, defined by RFC 9116, giving a contact for reporting vulnerabilities and an expiry date for that information. It is included here as the contrast case: a well-known machine file with an actual standard behind it, which llms.txt, ai.txt and agents.md do not have. It supports exactly one claim, that a reporting route is published; its presence says nothing about the site's security, and an expired one is worse than none because it is a promise nobody kept.
Terms this definition uses
Machine files
The files addressed to machines rather than readers, and what publishing one does and does not buy.
llms.txt · llms-full.txt · agents.md · entity map · entity map parity · machine layer · well-known URI · MCP · agent card · sitemap index · OpenAPI specification · ai.txt · Tool definition · SKILL.md · sitemap origin error · soft 404 on a machine file · tdmrep.json · TDM exception
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