feat(agent): M3+M4 — gateway transport + the agent loop#7
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… loop M3 (transport): - client::GatewayClient — the harness's only network surface. Picks the dialect by model, POSTs provider wire to the gateway with a bai_v1 bearer (adds anthropic-version for the Anthropic dialect), and frames the chunked SSE body line-by-line into StreamEvents via async-stream. No provider keys. - mock::MockTransport — replays scripted StreamEvent turns and records requests, so the loop and the binaries test with no network. - dialect::push_sse_line — incremental per-line decode the client drives off the socket (decode_sse now builds on it). M4 (loop): - agent::Agent — Pi's pi-agent-core runtime. One iteration = stream a turn, assemble assistant content blocks from the event stream (dialect-blind), append, run requested tools, feed results back, repeat until end_turn or max_steps. Tool failures become error tool_results, not aborted runs. Proven: 21 agent-core unit tests (loop dispatch, tool round-trip, unknown/ failing tool, max_steps, event streaming) + 2 real-socket integration tests driving GatewayClient against a bare TCP SSE server (success + HTTP error). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This was referenced Jun 30, 2026
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What — M3 (transport) + M4 (loop)
M3 — transport
client::GatewayClient— the harness's only network surface. Picks the dialect by model id, POSTs provider wire to the gateway with anAuthorization: Bearer <bai_v1…>(addsanthropic-versionfor the Anthropic dialect), and frames the chunked SSE body line-by-line intoStreamEvents (viaasync-stream). It never holds a provider key — the gateway swaps the pool key and meters.mock::MockTransport— replays scriptedStreamEventturns and records the requests the loop sends, so the loop and the binaries test with zero network. Shipsturn::text/turn::tool_callhelpers.dialect::push_sse_line— incremental per-line decode the client drives off the socket;decode_ssenow builds on it.M4 — the loop
agent::Agent— Pi'spi-agent-coreruntime. One iteration = stream a turn → assemble assistant content blocks from the event stream (dialect-blind) → append → run requested tools → feedtool_results back → repeat untilend_turnormax_steps. A tool's own failure becomes an errortool_result, not an aborted run. Streams every event to anon_eventcallback (for live rendering).Proven by
tool_result), unknown tool, failing tool,max_stepsenforcement, event streaming.GatewayClientdriven against a bare TCP server emitting chunked SSE — success path (decodesTextDelta/Usage/MessageStop) and HTTP-error path (403 surfaces as a stream error). No hyper, no gateway, no keys.Series: M1 (#5), M2 (#6) merged. Next: M6 tools + M5 binary e2e against a mock model server.
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