a2a.compat.v0_3.context_builders module

Context builders that add v0.3 backwards-compatibility for extensions.

The current spec uses A2A-Extensions (RFC 6648, no X- prefix). v0.3 clients still send the old X-A2A-Extensions name, so the v0.3 compat adapters wrap the default builders with these classes to recognize both names.

class a2a.compat.v0_3.context_builders.V03GrpcServerCallContextBuilder(inner: GrpcServerCallContextBuilder)

Bases: object

Wraps a GrpcServerCallContextBuilder to also accept the legacy metadata.

Recognizes the v0.3 X-A2A-Extensions gRPC metadata key in addition to the spec A2A-Extensions.

build(context: grpc.aio.ServicerContext) → ServerCallContext

Builds a ServerCallContext, merging legacy extension metadata.

class a2a.compat.v0_3.context_builders.V03ServerCallContextBuilder(inner: ServerCallContextBuilder)

Bases: object

Wraps a ServerCallContextBuilder to also accept the legacy header.

Recognizes the v0.3 X-A2A-Extensions HTTP header in addition to the spec A2A-Extensions.

build(request: Request) → ServerCallContext

Builds a ServerCallContext, merging legacy extension headers.