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ya-agent-stream-protocol

Shared stream protocol adapters between ya-agent-sdk and applications.

The Python import package is ya_agent_stream_protocol.

The package owns the shared protocol boundary between ya-agent-sdk and applications:

  • AGUI event adaptation
  • compact replay buffers
  • message artifact validation
  • SSE framing helpers

YAACLI, YA Claw, and future applications configure their own event namespaces through AguiAdapterConfig instead of embedding application-specific names in this package.

SDK lifecycle projections use canonical snake-case names such as ya_agent.subagent_start, ya_agent.subagent_complete, and ya_agent.model_request_complete. The adapter is also a fail-closed public-data boundary: only explicitly allowlisted lifecycle DTOs are emitted, and unknown or future SDK events are dropped rather than generically serialized. Subagent projections omit parent logical-run IDs, native enqueue projections expose only a message count, model-request projections omit internal event/run IDs, file changes omit replacement content, and execution start/resume events omit prompt and deferred-result content. Full injected messages, durable input/enqueue identities, idempotency keys, raw lifecycle event IDs/timestamps, resumable state, and other host-owned data must remain outside AGUI replay and SSE.

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