* feat(github_copilot): route /v1/messages to Copilot native Anthropic endpoint
Add a GitHub Copilot Anthropic Messages transformation that routes supported Claude models through the native /v1/messages endpoint. This covers request URL construction, default headers, and supported model metadata.
* fix(github_copilot): address PR review feedback
Tighten the Anthropic Messages environment validation and web search interception behavior after review feedback. Avoid treating non-web-search requests as web-search-only paths.
* style(github_copilot): apply black formatting
Apply Black formatting to the GitHub Copilot Anthropic Messages tests.
* test(github_copilot): cover ProviderConfigManager dispatch for Anthropic Messages
Add coverage for ProviderConfigManager dispatch when GitHub Copilot models use the Anthropic Messages API, including non-Anthropic models returning no config.
* fix(github_copilot): apply messages-proxy intent header to /v1/messages
Set the messages-proxy interaction header for GitHub Copilot Anthropic Messages requests so /v1/messages uses the expected Copilot intent.
* fix(github_copilot): use modern generic annotations
Replace legacy typing generics in the GitHub Copilot Anthropic Messages transformation so the strict Ruff budget gate stays within its ceiling.
* refactor(github_copilot): decouple web-search short-circuit and harden /v1/messages URL
Address review feedback on the Copilot native Anthropic messages path.
Replace the hardcoded LlmProviders.GITHUB_COPILOT check in the web-search
interception handler with a handles_web_search_natively() method on
BaseAnthropicMessagesConfig (default True), overridden to False in
GithubCopilotAnthropicMessagesConfig. Provider-specific behavior now lives in
llms/ and the handler stays provider-agnostic, so a future provider in the same
situation needs no carve-out here.
In get_complete_url, reuse the already-resolved api_base returned by
validate_anthropic_messages_environment instead of reading the authenticator a
second time, removing redundant I/O and the mid-request inconsistency window.
The caller-supplied base is still discarded in validate, which is the security
boundary. Normalize a trailing slash on the base in both methods so a
tenant-specific host never yields a double-slash //v1/messages URL.
* fix(github_copilot): forward anthropic-beta headers on /v1/messages
The Copilot config inherited should_filter_anthropic_beta_headers()==True
from BaseAnthropicMessagesConfig, so update_headers_with_filtered_beta
stripped every anthropic-beta value after validate_anthropic_messages_environment
injected them (github_copilot has no mapping in
anthropic_beta_headers_config.json). That silently disabled header-gated
features like context_management and structured outputs on the native
passthrough. Override the hook to False, matching OpenAILikeAnthropicMessagesConfig.
* test(github_copilot): remove dead branch in beta-header regression test
The anthropic-beta filtering test guarded the fix with an if branch on
should_filter_anthropic_beta_headers(), which is always False, so the branch was
unreachable. Replace it with a direct assertion that running the provider-scoped
filter for github_copilot strips every beta value, proving why the override is
load-bearing and catching a regression that flips it back on.
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Co-authored-by: ririnto <ririnto@kakao.com>
Co-authored-by: Cursor Agent <cursoragent@cursor.com>
