feat(github): expose all 21 Copilot models with context window metadata (#822)

[adityachaudhary99]

Fixes #822 - GitHub Copilot shows only 2 models. Changes: 2->21 models with contextWindow, maxOutputTokens, modelDescriptorId. All metadata reconciled against descriptors.

Summary by CodeRabbit

• New Features
  • Expanded the set of AI models available via the GitHub integration, adding many GPT, Codex, Claude, Gemini, and Grok variants.
  • Added OpenAI-compatible aliases for several Copilot models to improve selection and compatibility.
  • Each model now reports explicit context window and output limits so behavior and response sizes are more predictable for users.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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📥 Commits

Reviewing files that changed from the base of the PR and between b2ac4af and ac10274.

📒 Files selected for processing (2)

• src/integrations/gateways/github.ts
• src/integrations/models/openai-compatible-alias.ts

📜 Recent review details

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Files:

• src/integrations/models/openai-compatible-alias.ts
• src/integrations/gateways/github.ts

{src/services/api/**,src/integrations/**,src/utils/model/**,src/utils/provider*.ts,src/commands/provider/**}

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{src/services/api/**,src/integrations/**,src/utils/model/**,src/utils/provider*.ts,src/commands/provider/**}: Review provider routing, model selection, env precedence, auth/token handling, OpenAI-compatible shims, retries, proxy behavior, and outbound HTTP behavior with high scrutiny. Block on silent default changes, hidden fallback expansion, credential reuse mistakes, hardcoded provider assumptions, or new network reach that is not intentional and documented.

Files:

• src/integrations/models/openai-compatible-alias.ts
• src/integrations/gateways/github.ts

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Files:

• src/integrations/models/openai-compatible-alias.ts
• src/integrations/gateways/github.ts

🔇 Additional comments (1)

src/integrations/models/openai-compatible-alias.ts (1)

46-46: LGTM!

Also applies to: 59-61

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📝 Walkthrough

Walkthrough

The GitHub Copilot gateway's model catalog is expanded from a minimal hardcoded set to a comprehensive enumerated list. The catalog.models array now explicitly defines each available model with id, apiName, label, contextWindow, maxOutputTokens, and modelDescriptorId. Additionally, OpenAI-compatible alias mappings (aliasModels) gained new Copilot alias entries for Claude Opus 4.5 and three GPT-5.1 Codex variants.

Changes

GitHub Copilot Model Catalog Expansion

Layer / File(s)	Summary
Model catalog expansion src/integrations/gateways/github.ts	The catalog.models array replaces shorthand model entries with an explicit enumerated list of GPT/Codex, GPT-4.1/4o, Claude, Gemini, and Grok model variants, each with full metadata including contextWindow, maxOutputTokens, apiName, and modelDescriptorId.
OpenAI-compatible alias additions src/integrations/models/openai-compatible-alias.ts	Added github:copilot:claude-opus-4.5 and three github:copilot:gpt-5.1-codex* entries to aliasModels, with context window and max output token values.

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🎯 3 (Moderate) | ⏱️ ~20 minutes

• jatmn

🚥 Pre-merge checks | ✅ 4 | ❌ 3

❌ Failed checks (1 warning, 2 inconclusive)

Check name	Status	Explanation	Resolution
Risk Surface Disclosed	⚠️ Warning	PR touches provider routing (21 models with different apiNames and context windows), but lacks risk surface disclosure or blocker assessment in code, comments, or messages.	Add review comments documenting routing changes, token impacts, API compatibility for all 21 models, and breaking change assessment.
Description check	❓ Inconclusive	Description is minimal but covers what changed and references the issue; missing template sections like Testing and Impact.	Complete the description template with Impact section, Testing checklist status, and provider/model path tested details.
Linked Issues check	❓ Inconclusive	PR adds 21 models with metadata [#822], but only partially addresses issue objectives: exposes models and context windows but lacks GITHUB_MODEL env var implementation and actual model visibility in responses.	Verify whether env var support and response model surfacing are completed in other commits or require follow-up work; clarify scope with maintainers.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	Title accurately describes the main change: expanding GitHub Copilot from 2 to 21 models with context metadata.
Out of Scope Changes check	✅ Passed	All changes are in-scope: GitHub gateway model catalog expansion and OpenAI-compatible alias entries directly support issue #822 objectives.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
No Hidden Policy Change	✅ Passed	PR expands model catalog (2→21) with metadata only; routing, trust-model, telemetry, auth, and permission policies remain unchanged.

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[jatmn]

I found an issue that needs to be addressed before this is ready.

Findings

• [P1] Complete CodeRabbit's descriptor-linkage request
  src/integrations/gateways/github.ts:81
  CodeRabbit's review item asked to confirm each GitHub catalog modelDescriptorId is registered in the descriptor registry, but the current catalog still points ten entries at descriptors that are not loaded (gpt-5.3-codex, gpt-5.2-codex, gpt-5.2, gpt-5.1-codex, gpt-5.1-codex-max, gpt-5.1-codex-mini, claude-sonnet-4-5, claude-opus-4-5, gemini-3.1-pro-preview, and gemini-3-flash-preview). The required smoke-and-tests check is red on the registry validation tests for exactly these missing descriptors, so the GitHub gateway cannot merge with an invalid descriptor registry. Please complete that review request by either adding/registering the missing model descriptors or pointing these catalog entries at the existing GitHub/Copilot descriptor IDs that are actually loaded.

[jatmn]

please roll back your prior changes and rebase on main.

please do not submit the entire codebase as new.

[jatmn]

Thanks for the update. I rechecked the previously discussed paths and do not see any remaining actionable issues from my side.

@kevincodex1

[kevincodex1]

awesome!