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What fields are in an A2A Agent Card?
The protocol specification defines the card; cloud providers may wrap it, project it into another version, or impose their own access and transport rules. Compare the protocol card separately from service registration settings and provider-specific API objects.
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| Field area | A2A v1.0 | v0.3 or implementation note |
|---|---|---|
| Identity | name, description, and agent version. |
v0.3 includes these as well. The agent’s version is not the protocol version. A2A specification |
| Endpoint and protocol | Ordered supportedInterfaces[]; each interface includes a URL, protocol binding, and protocol version. The first interface is preferred. |
v0.3 uses top-level url and protocolVersion; v1.0 deprecates the top-level protocol-version field. A2A specification |
| Provider and documentation | Optional provider and documentationUrl. |
These are descriptive protocol metadata, not universal cloud endpoint fields. A2A specification |
| Capabilities | capabilities can describe streaming, push notifications, extensions, and extended-card availability. |
Google’s v0.3 example also includes stateTransitionHistory; check the schema for the selected version rather than assuming feature sets are identical. A2A specification Google Agent Registry |
| Security | Optional security scheme definitions and requirements; v1.0 includes API key, HTTP, OAuth 2.0, OpenID Connect, and mutual TLS types. | The card describes authentication requirements, but endpoint access remains implementation-specific. Do not put secrets in a public card. A2A specification |
| Input and output modes | defaultInputModes and defaultOutputModes. |
Skills can further describe modes and examples; Google documentation includes MIME-type examples. A2A specification Google Agent Registry |
| Skills | skills[] entries include identifiers, names, descriptions, and tags; examples can describe useful request patterns. |
Google CX Agent Studio’s trimmed resource requires core card fields and exposes per-skill input and output modes. A2A specification Google CX Agent Studio API |
| Integrity and discovery | Cards can include JWS signatures; standardized discovery uses /.well-known/agent-card.json. |
Verify each implementation’s URI and signature behavior. Microsoft Foundry documents version-specific card URLs that require Entra authentication. A2A specification Microsoft Foundry A2A documentation |
What changes between A2A Agent Card v0.3 and v1.0?
The key structural change is endpoint representation. In v0.3, one top-level URL is paired with a top-level protocol version. In v1.0, each entry in supportedInterfaces carries its own URL, binding, and protocol version. The ordered list lets an agent expose functionality through multiple protocol bindings; the first listed interface is preferred.
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Do not mechanically rename fields or assume every capability carries across unchanged. Validate a card against the schema for its declared protocol version.
How do Google Cloud, Microsoft Foundry, and AWS AgentCore differ?
Google Cloud
Google Agent Registry accepts v0.3 and v1.0 cards, with v1.0 recommended. Gemini Enterprise registration accepts a JSON Agent Card and can use optional authorization configuration to access Google Cloud resources on a user’s behalf. That authorization configuration is a service-level registration mechanism, not a protocol-card field. Google Agent Registry
Google CX Agent Studio’s API documents a trimmed AgentCard centered on name, description, supported interfaces, version, and skills. Its AgentInterface includes URL, binding, tenant, and protocol version. The documented bindings are JSONRPC, GRPC, and HTTP+JSON; production requires an absolute HTTPS URL. This is a cloud resource representation, not a replacement for the complete A2A protocol schema. Google CX Agent Studio API
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Microsoft documents A2A v1.0 as generally available and v0.3 as preview. It provides separate card endpoints for the versions and projects authored content into both shapes. Its inbound transport documentation lists HTTP+JSON and JSON-RPC for v0.3, and JSON-RPC only for v1.0; it does not list gRPC. The card URLs require Microsoft Entra ID authentication, and anonymous card access is unsupported. These restrictions can affect discovery and compatibility even when the JSON fields look valid. Microsoft Foundry A2A documentation
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AWS Bedrock AgentCore
AWS’s Bedrock AgentCore Developer Guide states that an agent card’s capabilities, skills, and communication interface are validated against the A2A Agent Card specification. The available documentation establishes that narrow validation point; it does not establish a separate AWS field schema, protocol-version matrix, or transport behavior. AWS Bedrock AgentCore Developer Guide
How to compare two cards reliably
- Confirm the protocol version. Validate each card against that version’s schema before comparing field names. A2A specification Google Agent Registry
- Compare endpoint and interface details together. For v1.0, inspect each interface’s URL, binding, protocol version, and position in the ordered list. For v0.3, inspect top-level
urlandprotocolVersion. - Check advertised capabilities against provider support. A capability in a card is a declaration; the consuming cloud service may support fewer transports or features. Microsoft’s documented transport matrix is one example. Microsoft Foundry A2A documentation
- Compare skills as discovery metadata. Review each skill’s identifier, description, tags, examples, and modes. These descriptions help an agent decide what to request, but do not prove successful execution. A2A specification
- Separate declared security from actual access control. Review card security schemes and the cloud’s real endpoint and discovery requirements independently. Microsoft Foundry’s authenticated card URLs show why access to discovery itself matters. Microsoft Foundry A2A documentation
- Separate protocol fields from provider wrappers. Treat registration settings such as Google’s
authorizationConfigand trimmed cloud API objects as service-specific constructs, not universal Agent Card fields. Google Agent Registry Google CX Agent Studio API
Where should you find an Agent Card?
The current A2A specification identifies /.well-known/agent-card.json for standardized discovery and allows cards to carry JWS signatures. Do not assume every cloud exposes that exact path or signature behavior: implementations may use version-specific URLs, authentication, or other documented discovery mechanisms. A2A specification Microsoft Foundry A2A documentation
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