feat: native Anthropic pass-through for Claude models (#38)#48
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- H1: Remove dead [DONE] sentinel from native SSE loop (Anthropic terminates via connection close) - H3: Conditionally set accept: text/event-stream only when streaming - M1: buildUpstreamPayload returns rest (not payload) when thinking absent, stripping output_config - M2: Truncate raw SSE data to 200 chars in warn log to prevent log injection - L2: Remove claude_ underscore prefix heuristic (no known Anthropic model uses it) - L3: Document >= 7 threshold comment in isAdaptiveThinkingModel - L4: Replace verbose JSDoc on nativeAnthropicModelIds with concise standard form - Export buildUpstreamPayload for direct unit testing - Add tests/native-passthrough.test.ts with T1-T9 covering payload transform and model routing Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
Route Anthropic
/v1/messagesrequests for Claude models directly to GitHub Copilot's native Anthropic endpoint, bypassing the OpenAI translation layer. This preserves:thinkingblocks withsignaturefield (required for multi-turn reasoning)cache_creation_input_tokensin usagetop_kparametercache_controlon system/user blocksChanges
src/services/copilot/create-messages-native.ts(new) — POSTs Anthropic payloads directly to${copilotBaseUrl}/v1/messages; stripsopenai-intentheader; auto-upgrades{ type: "enabled" }→{ type: "adaptive" }for claude-opus-4.7+ modelssrc/services/copilot/native-models.ts(new) —isNativeAnthropicModel()checksstate.modelsvendor field first, falls back toclaude-prefix heuristicsrc/routes/messages/handler.ts— dispatch logic: Claude → native path, everything else → translation path;manualApprovegate moved before dispatch so both paths are gatedsrc/routes/messages/anthropic-types.ts—signature?onAnthropicThinkingBlock; unionthinkingtype for adaptive;output_config;AnthropicImageBlockURL source;AnthropicToolResultBlock.contentwidenedsrc/routes/messages/non-stream-translation.ts— imagesource.type === "base64"narrowing; updated commenttests/native-passthrough.test.ts(new) — 19 tests coveringbuildUpstreamPayload(T1–T6 incl. empty output_config),isNativeAnthropicModel(T5–T9), andisAdaptiveThinkingModelboundaries (B1–B6: 4.6/4.7/4.8, dot/dash separator, non-opus, multi-digit)Test plan
bun test)claude-sonnet-4-5) request routes to native pathgpt-4o) routes to translation pathclaude-opus-4.7+with legacy thinking auto-upgraded to adaptive formatCloses #38, #44, #45
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