agents.txt Reference Agent: A2A agent card

This page copies no directory. Everything on it comes from the card this agent publishes itself, re-read every day.

Readable card, points to review

No required field is missing, but some points deserve attention.

What the card declares

Explain an agents.txt directiveReturns the spec section text for a named directive (Protocols, Authorization, MCP, Skills, A2A, etc.) plus an example and the relevant section number.
- spec
- agents.txt
- documentation
Validate agents.txt and agents.jsonRuns the spec validators against a site's discovery files and returns a compliance report. Delegates to the audit_site MCP tool exposed at mcp.agents-txt.com.
- validation
- audit
- compliance
Explain an announced payment protocolReturns a plain-language explanation of any payment protocol the site declares (x402, mpp, ap2): what it is, what role it plays, where the runtime details live, and how it composes with the others.
- payments
- x402
- mpp
- ap2
- documentation
Summarize a site's agent capabilitiesReads agents.txt and agents.json from a target origin, summarizes the declared payment protocols, authorization scheme, MCP endpoints, skill packages, and A2A AgentCards in plain language.
- discovery
- capabilities
- summary

WarningdefaultInputModes[0] is not a media type in the form type/subtypedefaultInputModes[0]
WarningdefaultOutputModes[0] is not a media type in the form type/subtypedefaultOutputModes[0]
WarningCard written in the shape used before v1.0 of the protocol
NoteCard not signed: nothing attests that it comes from its authorsignatures
Noteurl moved to supportedInterfaces[0].url in v1.0url
NoteprotocolVersion moved to supportedInterfaces[].protocolVersion in v1.0protocolVersion

Latest reading : 2026-09-08