[docs] auth: docs: correct /models GET auto API-version claim in auth-matrix

[github-actions]

Summary

• Scan window: 2026-09-09 through 2026-09-11 (UTC)
• Sources reviewed: repository commit history since the scan window (git log --all), current-main docs/auth-matrix.md, docs/authentication-architecture.md, docs/api-proxy-sidecar.md, docs/environment.md, docs/awf-config-spec.md, docs/github_actions.md, README.md; implementation in containers/api-proxy/providers/copilot.js, containers/api-proxy/providers/copilot-auth.js, containers/api-proxy/providers/auth-headers.js, src/services/api-proxy-env-config.ts; and Jest tests copilot-adapter-enterprise.test.js, copilot-byok.test.js, copilot-auth.test.js. Also verified fix: isolate Actions OIDC from agent container #6894 and Ensure HTTP MCP GitHub OIDC bypasses the AWF agent credential boundary gh-aw#50053, both merged/resolved and already correctly documented across docs/environment.md, docs/auth-matrix.md, and docs/authentication-architecture.md — no changes needed there.
• Corrected authentication path: the Copilot /models GET auto API-version behavior in docs/auth-matrix.md.
• Current-main vs. pending behavior clarified: the recent auth-adjacent PRs in the window (Fix Copilot proxy auth and GHEC model discovery #8038 fine-grained PAT/GHEC model discovery fix, Use ****** for GHEC Copilot data-residency targets #8113 GHEC data-residency Bearer fix, Extract shared auth-header builder for OpenAI and Copilot provider adapters #8226 auth-header-builder refactor) are already fully and correctly reflected in docs/auth-matrix.md; only the /models GET API-version gap below was stale.

Documentation Changes

• docs/auth-matrix.md — Auto API Version Injection section:
  • Added a /models GET row (X-GitHub-Api-Version: 2026-07-01) to the auto-version table; it was previously omitted even though the sidecar always sets this header for GitHub Copilot catalog targets.
  • Removed the incorrect blanket claim "Non-POST requests never receive auto-injected versions," which directly contradicted the /models GET behavior, and replaced it with an accurate description: /models GET is handled by a separate, unconditional code path (buildCopilotModelsRequest() and the request-header hook in copilot.js), distinct from the POST-gated getDefaultAutoApiVersion() logic that governs /auto, /models/session, and /models/session/intent.
  • Cross-referenced the existing "/models Endpoint (Special Case)" section with the same corrected version-injection fact and the two Jest test files that assert it.

Validation

• Implementation checked against current main: containers/api-proxy/providers/copilot.js (buildCopilotModelsRequest(), getDefaultAutoApiVersion(), COPILOT_MODELS_API_VERSION = '2026-07-01', the /models GET request-header branch).
• Tests checked: containers/api-proxy/copilot-adapter-enterprise.test.js (asserts X-GitHub-Api-Version = 2026-07-01 on /models GET) and containers/api-proxy/copilot-byok.test.js (asserts the same version on getModelsFetchConfig() and distinguishes it from the POST-gated /auto//models/session cases).
• Markdown structure, table formatting, and relative references reviewed manually (markdownlint-cli2 unavailable offline in this sandbox — package registry blocked network egress).
• Diff reviewed for token/key/JWT values and credential-bearing URLs: none present; only public endpoint paths, header names, and a public API version string were added.
• Searched open PRs for "[docs] auth:" in the title via the GitHub MCP search — zero open matches, so this is not a duplicate.

Sources

• Fix Copilot proxy auth and GHEC model discovery #8038 (Fix Copilot proxy auth and GHEC model discovery, merged)
• Use ****** for GHEC Copilot data-residency targets #8113 (Use Bearer for GHEC Copilot data-residency targets, merged)
• Extract shared auth-header builder for OpenAI and Copilot provider adapters #8226 (Extract shared auth-header builder for OpenAI and Copilot provider adapters, merged)
• fix: isolate Actions OIDC from agent container #6894 (fix: isolate Actions OIDC from agent container, merged)
• Ensure HTTP MCP GitHub OIDC bypasses the AWF agent credential boundary gh-aw#50053 (Ensure HTTP MCP GitHub OIDC bypasses the AWF agent credential boundary, resolved by Enforce runner→gateway OIDC path and prevent AWF agent exposure for HTTP MCP auth gh-aw#50054)
• Repository source: containers/api-proxy/providers/copilot.js, containers/api-proxy/copilot-adapter-enterprise.test.js, containers/api-proxy/copilot-byok.test.js

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Generated by Auth Doctor Updater · copilot · auto · 126.7 AIC · ⊞ 10.7K · ◷

[Copilot]

🟡 Changes recommended

The documentation incorrectly claims unconditional injection, although BYOK-only requests receive no version header.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

Updates Copilot authentication documentation to describe /models GET API-version injection.

Changes:

• Adds /models GET to the version table.
• Documents its separate request-header path.
• References implementation tests.

File summaries

File	Description
docs/auth-matrix.md	Documents /models API-version behavior.

Review details

Suppressed comments (2)

docs/auth-matrix.md:204

• The implementation does not always attach this header for a catalog target: getAuthHeaders() requires both a GET models path and a non-empty githubToken, while BYOK-only mode is explicitly supported (copilot-byok.test.js:239-243). Without a GitHub token, getDefaultAutoApiVersion() returns no value for GET, so this blanket statement is false.

- `/models` GET is handled by a separate, unconditional code path (`buildCopilotModelsRequest()` and the request-header hook in `copilot.js`), not by the POST-gated `getDefaultAutoApiVersion()` logic above — it always attaches `X-GitHub-Api-Version: 2026-07-01` for GitHub Copilot catalog targets.

docs/auth-matrix.md:208

• This repeats the same unsupported guarantee for BYOK-only mode. On a default catalog target configured only with COPILOT_PROVIDER_API_KEY, /models uses that key but does not receive the API-version header because the special branch requires githubToken; qualify the statement accordingly.

The `/models` endpoint prefers `COPILOT_GITHUB_TOKEN` (GitHub OAuth) over BYOK keys when both are configured, because model listing is a GitHub platform feature. However, when no GitHub token is available (typical for direct-BYOK/custom targets), `/models` will use the BYOK credential. For GitHub Copilot catalog targets, `/models` GET requests always receive `X-GitHub-Api-Version: 2026-07-01` (`COPILOT_MODELS_API_VERSION` in `copilot.js`), verified by `copilot-adapter-enterprise.test.js` and `copilot-byok.test.js`.

• Files reviewed: 1/1 changed files
• Comments generated: 1
• Review effort level: Balanced

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✅ Copilot review passed with no inline comments.

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