feat: support Anthropic /v1/messages route on Copilot - #26911
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GitHub Copilot CLI targeting Claude models sends Anthropic-style /v1/messages requests. The Copilot provider only registered the OpenAI-compatible /chat/completions and /responses routes, so these requests failed with "route not supported: POST /copilot/v1/messages". Register /v1/messages as a bridged route and reuse the existing intercept/messages logic to handle it. Copilot is BYOK with no Bedrock backing, so the per-user bearer token flows through unchanged.
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Self-review: ✅
dannykopping
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July 1, 2026 09:14
ssncferreira
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The Authorization check in CreateInterceptor runs before route dispatch and is route-independent, so it is already covered by the existing MissingAuthorizationHeader test.
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Implements AIGOV-481. Adds the Anthropic-style
/v1/messagesroute to the Copilot provider.GitHub Copilot CLI (1.0.65) using the default
Claude Sonnet 4.6 (default)model sends Anthropic-style/v1/messagesrequests throughaibridgeproxydto the Copilot provider. The provider only registered the OpenAI-compatible/chat/completionsand/responsesroutes, so these requests failed:This PR was produced by opencode (agent) using the
anthropic/claude-opus-4-8model, under human direction and review.