feat: serialize AgentEvent and StreamDelta for wire transport#72
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AgentEvent and StreamDelta now derive Serialize, Deserialize, and
PartialEq. The wire format is internally tagged camelCase JSON
({"type":"toolExecutionEnd","toolCallId":...,"isError":false})
and is a frozen public contract guarded by snapshot tests, so external
frontends (websocket fanout servers, TS clients, JSONL pipes) can
consume the event stream directly.
Additive only: no variant, field, or signature changes. serde floor
bumped to 1.0.186 for rename_all_fields.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Review findings from PR #72: - Normalize the five remaining snake_case payload fields to camelCase (usage.cacheRead/cacheWrite/totalTokens, errorMessage, providerMetadata) with serde aliases so pre-0.13 session files still load. The wire contract is now uniformly camelCase. - Freeze tags via exhaustive match (no wildcard): a new AgentEvent or StreamDelta variant now fails to compile in the test file until its wire tag is pinned. - Exact-JSON snapshot of a full messageEnd payload (all Content variants, non-default Usage, errorMessage) — freezes the nested shape that carries most wire bytes. - Forward-compat tests: unknown fields ignored, unknown/wrong-case tags are clean Errs; legacy snake_case payload load test. - Fix docs: MessageUpdate.message is a placeholder during streaming; clients accumulate deltas and resync at MessageEnd (the cumulative claim was false). - serde floor corrected to 1.0.181 (actual rename_all_fields release). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Applied review fixes from the two-agent pass:
393 tests green, clippy |
This was referenced Jul 14, 2026
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Summary
AgentEventandStreamDeltanow deriveSerialize,Deserialize, andPartialEq{"type":"toolExecutionEnd","toolCallId":"...","isError":false}— declared a frozen public contract in the rustdoc and guarded by snapshot tests (all 12 variant tags + camelCase field names)rename_all_fields; released Aug 2023)MessageUpdatecarries the cumulative message)This is the only yoagent change needed to support external streaming frontends (websocket fanout, TypeScript clients, JSONL pipes) — first step of the yoyo-serve track.
Additive only: no variant, field, or signature changes; existing sinks that match/clone/Debug events are untouched.
Test plan
AgentEvent+StreamDeltavariant"type"tags frozen{"type":"agentStart"}) + inbound raw-JSON parsecargo test --all-features— 393 tests green; clippy-Dwarningsclean🤖 Generated with Claude Code