{"id":"a2a-java-sdk","name":"A2A Java SDK","url":"https://github.com/a2aproject/a2a-java","category":["agent-protocol","developer-tooling","protocol-sdk","interoperability"],"one_liner":"Official Apache-2.0 Java SDK for the Agent2Agent (A2A) Protocol, published as multi-module Maven artifacts with client/server support for JSON-RPC, gRPC and REST transports, reference implementations, examples and option","a_score":40,"band":"unverified","provisional_band":"ready","dimensions":{"access":25,"payment":25,"interface":18,"completion":null,"docs":7},"permission":{"status":"granted","source":"https://raw.githubusercontent.com/a2aproject/a2a-java/main/LICENSE"},"blocker":{"kind":"none"},"how_to_use":{"interface":"rest","mcp":null,"openapi":null,"base_url":null,"payment":{"model":"free","currencies":["USD"],"reference_task_cost_usd":0}},"verified":{"verdict":"not-attempted","at":"2026-09-22","human_interventions":0,"transcript_sha":null},"rubric":"sha256:cd605a44799f49951bf078fda63c5b21ad3c07db494f41d38ad19ce729c5551a","last_verified_at":"2026-09-22","audit_url":"/entry/a2a-java-sdk/audit.json","compact_note":"Public machine card is compacted for FANA scanner compatibility and deployment size. Full source entry and signed audit event body remain in the ag3ntsearch git tree; audit_url publishes hash-chain provenance."}