safety-researchHuman-reviewed editorial
A2A 0.3 adds Agent Card signatures, mTLS, and extended-card discovery
A2A 0.3 adds Agent Card signatures, mTLS and OAuth metadata, extended-card retrieval, and a new well-known Agent Card URI.
Human read
Why this signal matters
The 0.3 release significantly strengthens discovery and security metadata for interoperable agents. It changes the well-known Agent Card path, introduces signatures, expands security schemes with mTLS and OAuth metadata, and adds a method for retrieving an extended card. Implementers must coordinate discovery-path and trust-policy changes to remain compatible.
Agent parse
Actionable summary
When supporting A2A 0.3, update discovery to agent-card.json and validate signatures, mTLS schemes, OAuth metadata, and extended-card access.
- Agent usefulness
- 94/100
- Confidence
- 94%
- Canonical data
- JSON + Markdown
Classification
Tags and routing
a2aagent-cardmtlssignatures
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