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* feat: native Anthropic API mode for Claude models on GitHub Copilot When using Claude models through GitHub Copilot, automatically switch from the OpenAI-compatible shim to Anthropic's native messages API format. The Copilot proxy (api.githubcopilot.com) supports Anthropic's native API for Claude models. This enables cache_control blocks to be sent and honoured, allowing explicit prompt caching control (as opposed to relying solely on server-side auto-caching). Changes: - Add isGithubNativeAnthropicMode() in providers.ts that auto-enables when the resolved model starts with "claude-" and the GitHub provider is active - Create a native Anthropic client in client.ts using the GitHub base URL and Bearer token authentication when native mode is detected - Enable prompt caching in claude.ts for native GitHub mode so cache_control blocks are sent (previously only allowed for firstParty/bedrock/vertex) - CLAUDE_CODE_GITHUB_ANTHROPIC_API=1 env var to force native mode for any model Benefits: - Proper Anthropic message format (no lossy OpenAI translation) - Explicit cache_control blocks for fine-grained caching control - Potentially better Claude model behaviour with native format Related: #515 * fix: scope force flag to Claude models and add isGithubNativeAnthropicMode tests - CLAUDE_CODE_GITHUB_ANTHROPIC_API=1 now returns false for non-Claude models (force flag still useful for aliases like 'github:copilot' with no model resolved yet, where it returns true when model is empty) - Add 7 focused tests covering mode detection: off without GitHub provider, auto-detect via OPENAI_MODEL and resolvedModel, non-Claude model rejection, and force-flag behaviour for claude/non-claude/no-model cases * fix: detect github:copilot:claude- compound format, remove force flag OPENAI_MODEL for GitHub Copilot uses the format 'github:copilot:MODEL' (e.g. 'github:copilot:claude-sonnet-4'), which does not start with 'claude-'. Auto-detection now handles both bare model names and the compound format. The CLAUDE_CODE_GITHUB_ANTHROPIC_API force flag is removed: with proper compound-format detection there is no remaining gap it could fill, and keeping a broad override flag without a concrete use case invites misuse. Tests updated to cover the compound format, generic alias (false), and non-Claude compound model (github:copilot:gpt-4o → false). * fix: use includes('claude-') for model detection, remove force flag Detection was broken for the standard GitHub Copilot compound format 'github:copilot:claude-sonnet-4' which does not start with 'claude-'. Using includes('claude-') handles bare names, compound names, and any future variants without needing updates. The CLAUDE_CODE_GITHUB_ANTHROPIC_API force flag is removed as it was a workaround for the broken detection, not a genuine use case. --------- Co-authored-by: Zartris <14197299+Zartris@users.noreply.github.com>
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