Three tests covering the CC→Responses→Anthropic finalize path:
- TestStreamingParallelToolUseNoGhostDelta: full end-to-end with two
parallel tool_calls, asserts every content_block_delta targets a
started block
- TestStreamingParallelToolUseSecondToolPackedArgsDone: focused test
where tool 1 streams deltas and tool 2 has packed .done args
- TestStreamingThreeParallelToolsAllPackedDone: three tools all with
packed .done, the most extreme case
All three fail on unfixed code (ghost deltas on wrong indices) and
pass after the fix.
Skip the Responses API intermediate representation on the /v1/messages
force-chat path. Previously every streaming token ran through two state
machines (CC→Responses→Anthropic); now it runs through one (CC→Anthropic).
New file backend/internal/pkg/apicompat/chatcompletions_anthropic_bridge.go:
- AnthropicToChatCompletionsRequest: request-side direct conversion
- ChatCompletionsResponseToAnthropic: non-stream response direct conversion
- ChatCompletionsChunkToAnthropicEvents + Finalize: single streaming state machine
openai_gateway_messages_chat_fallback.go rewired to use the direct bridge.
Existing 7 ForceChatCompletions end-to-end tests pass unchanged; 22 new
unit tests added including equivalence tests vs the double-conversion path.
resToAnthHandleFuncArgsDone used state.ContentBlockIndex directly
instead of looking up from OutputIndexToBlockIdx like
resToAnthHandleFuncArgsDelta does. When multiple tool_calls arrive
in parallel and arguments come as a packed .done (no prior delta),
the second+ tool would emit content_block_delta on an index that
was never content_block_start'ed, causing Claude Code to report
"Content block not found".
Fix: resolve block index from OutputIndexToBlockIdx, and skip the
delta if the block is already closed or the index doesn't match
the current open block.
Closes#4193
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