feat(agent): M2 — OpenAI + Anthropic wire dialects#6
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Add `agent_core::dialect`: per-provider request building and streaming SSE decoding, normalizing both providers onto the dialect-agnostic StreamEvent sequence the loop will consume. - Dialect::for_model picks Anthropic for Claude, OpenAI wire otherwise. - anthropic: near-identity mapping (internal model is Anthropic-shaped); decodes content_block_*/message_* into TextDelta/ToolUseStart/ InputJsonDelta/ContentBlockStop/Usage/MessageStop. - openai: translates system→message, ToolUse→tool_calls (args as JSON string), ToolResult→role:"tool" messages; decoder synthesizes the block-stop boundaries OpenAI omits and defers MessageStop past the trailing usage chunk. Both dialects emit identical event shapes. Proven against recorded text+tool_use SSE fixtures for each dialect, plus golden request-body assertions. 15 agent-core unit tests. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This was referenced Jun 30, 2026
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What — M2
Adds
agent_core::dialect: per-provider request building and streaming SSE decoding, normalizing both providers onto the dialect-agnosticStreamEventsequence the agent loop will consume. This is the one piece ofpi-aiworth porting (the gateway owns provider keys/routing; the harness owns the wire).Dialect::for_model— Claude → Anthropic (/v1/messages), everything else → OpenAI wire (/v1/chat/completions).anthropic— near-identity request mapping (the internal model is Anthropic-shaped); decoder translatescontent_block_*/message_*intoTextDelta/ToolUseStart/InputJsonDelta/ContentBlockStop/Usage/MessageStop.openai— real translation: system→message,ToolUse→tool_calls(arguments as a JSON string),ToolResult→role:"tool"messages; decoder synthesizes the block-stop boundaries OpenAI omits and defersMessageStoppast the trailing usage chunk. Both dialects emit identical event shapes so the loop is dialect-blind.Proven by
Recorded text + tool_use SSE fixtures for each dialect decoded to an exact
StreamEventsequence, plus golden request-body assertions (system hoisting, tool-call arg stringification, tool-result fan-out). 15 agent-core unit tests, no network.Part of the agent-harness series (M1 scaffold merged in #5). Next: M3 transport + M4 loop.
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