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ai-sdk-relay-protocol

v0.2.0

Published

Wire protocol for an agent-session relay: provider-agnostic AgentEvent stream, session channel (client ⇄ relay ⇄ runner), replay cursors, and permission flow, all as Zod schemas.

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Links

Git

Maintainers

brianhungbrianhung

Keywords

aiai-sdkharnessagentrelayprotocolwebsocket

Readme

ai-sdk-relay-protocol

The wire protocol for an agent-session relay: one Durable Object per session, many client sockets, exactly one runner driving the agent, and optionally one tool host serving local tools. Zod schemas are canonical; types are inferred so runtime validation and compile-time types never drift.

What it defines:

  • AgentEvent: the provider-agnostic output stream a runner emits (turn, text, reasoning, tool, artifact, error). Runners map harness stream parts (@ai-sdk/harness-*) onto these; provider-specific shapes never reach the relay or clients.
  • Session channel: the frame unions for each connection, ClientToSession, RunnerToSession, SessionToClient (sequenced updates, replay cursors, live text chunks, permission lifecycle), SessionToRunner, and the tool-host pair HostToSession / SessionToHost.
  • Permission lifecycle: requests, decisions, and a sequenced resolution for every request (answered, replayed, withdrawn, superseded, or unavailable).
  • Turn receipts and archives: TurnReceipt records a prompt's acceptance and progress; SessionArchive is a session's total state as one portable document, for moves and forks.
  • toModelMessages and archiveEvents: toModelMessages rehydrates a replay log into AI SDK ModelMessages, so the log is the canonical conversation state and a session can resume or hand off on any provider. archiveEvents extracts the events from an exported archive, so toModelMessages(archiveEvents(archive)) rebuilds a moved session's conversation.
  • decode / encode: malformed or oversized frames become typed errors, never exceptions or any.

The reference relay is ai-sdk-relay; the tool-host client is ai-sdk-relay-host. The reference product is dispatch, where this protocol was extracted from.