Add Anthropic Messages bridge for OpenAI-compatible chat providers - #26
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OnlyTerp merged 4 commits intoJun 8, 2026
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…s, add bridge tests - Fix content: None → empty string in _anthropic_assistant_message_to_chat for tool-only assistant messages (some providers reject null content) - Deduplicate _chat_stream_finish_to_anthropic_stop and _anthropic_usage_from_normalized from server.py; import canonical versions from translate.py instead - Add 4 new tests: tool call streaming, reasoning streaming, Anthropic-shaped error responses, and Anthropic pass-through streaming - Add 2 new translate tests: tool-only content and reasoning blocks
…ames - Use uuid4() for Anthropic message_id instead of timestamp (collision risk) - Rewrite model field in pass-through SSE message_start events - Preserve original tool names in _anthropic_tools_to_chat_tools and _anthropic_tool_choice_to_chat (remove _sanitize_tool_name mangling)
eafire15
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June 2, 2026 14:35
# Conflicts: # codex_shim/server.py
Samuel86-star
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Jun 10, 2026
Upstream's Anthropic Messages bridge PR (sybil-solutions#26) replaced server.py and dropped the [route] diagnostic prints that were added during the smart-vision-routing branch's merge conflict resolution. Re-add them to _post_openai_chat and _post_anthropic. Also fixes a merge regression where the old vision_router _route signature (returning tuple[ShimModel, dict]) leaked back into the merged file, causing two test failures.
jomangbp
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Jul 6, 2026
…ybil-solutions#26) * feat: add Anthropic Messages bridge * fix: empty string for tool-only assistant content, deduplicate helpers, add bridge tests - Fix content: None → empty string in _anthropic_assistant_message_to_chat for tool-only assistant messages (some providers reject null content) - Deduplicate _chat_stream_finish_to_anthropic_stop and _anthropic_usage_from_normalized from server.py; import canonical versions from translate.py instead - Add 4 new tests: tool call streaming, reasoning streaming, Anthropic-shaped error responses, and Anthropic pass-through streaming - Add 2 new translate tests: tool-only content and reasoning blocks * fix: uuid message ids, model slug in passthrough SSE, preserve tool names - Use uuid4() for Anthropic message_id instead of timestamp (collision risk) - Rewrite model field in pass-through SSE message_start events - Preserve original tool names in _anthropic_tools_to_chat_tools and _anthropic_tool_choice_to_chat (remove _sanitize_tool_name mangling) --------- Co-authored-by: codex <codex@openai.com> Co-authored-by: test <test@local>
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Summary
This adds an Anthropic Messages bridge for OpenAI-compatible providers:
Why
Some providers, including OpenCode Go, expose useful models across OpenAI-compatible and Anthropic-compatible surfaces. codex-shim already translates Codex Responses requests to both OpenAI-shaped chat completions and Anthropic Messages upstreams. This adds the reverse client-facing side: Anthropic-speaking clients can point at codex-shim and use configured OpenAI-compatible providers.
That makes OpenCode Go integration easier without adding a provider-specific dependency.
Changes
POST /v1/messages.provider: "anthropic"models.Supported bridge surface:
Deferred provider-specific surfaces:
cache_controlModel-assisted revision notes
/v1/messages, Anthropic-to-chat request conversion, chat-to-Anthropic response/stream conversion, pass-through behavior, docs, tests, and live smoke validation.content: nulltocontent: "", deduplicated helper logic, and expanded stream/error tests.Testing
Result:
Local smoke:
127.0.0.1:8786with an OpenAI-compatible upstream route.messagecontent./v1/messagesemits Anthropic SSE ending withmessage_stopand no OpenAI[DONE]sentinel.tool_usewithstop_reason: "tool_use".