feat: add support for GitHub Models provider

- Introduced environment variable CLAUDE_CODE_USE_GITHUB to enable GitHub Models.
- Added checks for GITHUB_TOKEN or GH_TOKEN for authentication.
- Updated base URL handling to include GitHub Models default.
- Enhanced provider detection and error handling for GitHub Models.
- Updated relevant functions and components to accommodate the new provider.

scripts/system-check.ts

@@ -93,11 +93,15 @@ function isLocalBaseUrl(baseUrl: string): boolean {
 }
 
 const GEMINI_DEFAULT_BASE_URL = 'https://generativelanguage.googleapis.com/v1beta/openai'
+const GITHUB_MODELS_DEFAULT_BASE = 'https://models.github.ai/inference'
 
 function currentBaseUrl(): string {
   if (isTruthy(process.env.CLAUDE_CODE_USE_GEMINI)) {
     return process.env.GEMINI_BASE_URL ?? GEMINI_DEFAULT_BASE_URL
   }
+  if (isTruthy(process.env.CLAUDE_CODE_USE_GITHUB)) {
+    return process.env.OPENAI_BASE_URL ?? GITHUB_MODELS_DEFAULT_BASE
+  }
   return process.env.OPENAI_BASE_URL ?? 'https://api.openai.com/v1'
 }
 
@@ -126,15 +130,47 @@ function checkGeminiEnv(): CheckResult[] {
   return results
 }
 
+function checkGithubEnv(): CheckResult[] {
+  const results: CheckResult[] = []
+  const baseUrl = process.env.OPENAI_BASE_URL ?? GITHUB_MODELS_DEFAULT_BASE
+  results.push(pass('Provider mode', 'GitHub Models provider enabled.'))
+
+  const token = process.env.GITHUB_TOKEN ?? process.env.GH_TOKEN
+  if (!token?.trim()) {
+    results.push(fail('GITHUB_TOKEN', 'Missing. Set GITHUB_TOKEN or GH_TOKEN.'))
+  } else {
+    results.push(pass('GITHUB_TOKEN', 'Configured.'))
+  }
+
+  if (!process.env.OPENAI_MODEL) {
+    results.push(
+      pass(
+        'OPENAI_MODEL',
+        'Not set. Default github:copilot → openai/gpt-4.1 at runtime.',
+      ),
+    )
+  } else {
+    results.push(pass('OPENAI_MODEL', process.env.OPENAI_MODEL))
+  }
+
+  results.push(pass('OPENAI_BASE_URL', baseUrl))
+  return results
+}
+
 function checkOpenAIEnv(): CheckResult[] {
   const results: CheckResult[] = []
   const useGemini = isTruthy(process.env.CLAUDE_CODE_USE_GEMINI)
+  const useGithub = isTruthy(process.env.CLAUDE_CODE_USE_GITHUB)
   const useOpenAI = isTruthy(process.env.CLAUDE_CODE_USE_OPENAI)
 
   if (useGemini) {
     return checkGeminiEnv()
   }
 
+  if (useGithub && !useOpenAI) {
+    return checkGithubEnv()
+  }
+
   if (!useOpenAI) {
     results.push(pass('Provider mode', 'Anthropic login flow enabled (CLAUDE_CODE_USE_OPENAI is off).'))
     return results
@@ -181,10 +217,19 @@ function checkOpenAIEnv(): CheckResult[] {
   }
 
   const key = process.env.OPENAI_API_KEY
+  const githubToken = process.env.GITHUB_TOKEN ?? process.env.GH_TOKEN
   if (key === 'SUA_CHAVE') {
     results.push(fail('OPENAI_API_KEY', 'Placeholder value detected: SUA_CHAVE.'))
-  } else if (!key && !isLocalBaseUrl(request.baseUrl)) {
+  } else if (
+    !key &&
+    !isLocalBaseUrl(request.baseUrl) &&
+    !(useGithub && githubToken?.trim())
+  ) {
     results.push(fail('OPENAI_API_KEY', 'Missing key for non-local provider URL.'))
+  } else if (!key && useGithub && githubToken?.trim()) {
+    results.push(
+      pass('OPENAI_API_KEY', 'Not set; GITHUB_TOKEN/GH_TOKEN will be used for GitHub Models.'),
+    )
   } else if (!key) {
     results.push(pass('OPENAI_API_KEY', 'Not set (allowed for local providers like Ollama/LM Studio).'))
   } else {
@@ -197,11 +242,19 @@ function checkOpenAIEnv(): CheckResult[] {
 async function checkBaseUrlReachability(): Promise<CheckResult> {
   const useGemini = isTruthy(process.env.CLAUDE_CODE_USE_GEMINI)
   const useOpenAI = isTruthy(process.env.CLAUDE_CODE_USE_OPENAI)
+  const useGithub = isTruthy(process.env.CLAUDE_CODE_USE_GITHUB)
 
-  if (!useGemini && !useOpenAI) {
+  if (!useGemini && !useOpenAI && !useGithub) {
     return pass('Provider reachability', 'Skipped (OpenAI-compatible mode disabled).')
   }
 
+  if (useGithub) {
+    return pass(
+      'Provider reachability',
+      'Skipped for GitHub Models (inference endpoint differs from OpenAI /models probe).',
+    )
+  }
+
   const geminiBaseUrl = 'https://generativelanguage.googleapis.com/v1beta/openai'
   const resolvedBaseUrl = useGemini
     ? (process.env.GEMINI_BASE_URL ?? geminiBaseUrl)
@@ -272,7 +325,11 @@ async function checkBaseUrlReachability(): Promise<CheckResult> {
 }
 
 function checkOllamaProcessorMode(): CheckResult {
-  if (!isTruthy(process.env.CLAUDE_CODE_USE_OPENAI) || isTruthy(process.env.CLAUDE_CODE_USE_GEMINI)) {
+  if (
+    !isTruthy(process.env.CLAUDE_CODE_USE_OPENAI) ||
+    isTruthy(process.env.CLAUDE_CODE_USE_GEMINI) ||
+    isTruthy(process.env.CLAUDE_CODE_USE_GITHUB)
+  ) {
     return pass('Ollama processor mode', 'Skipped (OpenAI-compatible mode disabled).')
   }
 
@@ -319,6 +376,22 @@ function serializeSafeEnvSummary(): Record<string, string | boolean> {
       GEMINI_API_KEY_SET: Boolean(process.env.GEMINI_API_KEY ?? process.env.GOOGLE_API_KEY),
     }
   }
+  if (
+    isTruthy(process.env.CLAUDE_CODE_USE_GITHUB) &&
+    !isTruthy(process.env.CLAUDE_CODE_USE_OPENAI)
+  ) {
+    return {
+      CLAUDE_CODE_USE_GITHUB: true,
+      OPENAI_MODEL:
+        process.env.OPENAI_MODEL ??
+        '(unset, default: github:copilot → openai/gpt-4.1)',
+      OPENAI_BASE_URL:
+        process.env.OPENAI_BASE_URL ?? GITHUB_MODELS_DEFAULT_BASE,
+      GITHUB_TOKEN_SET: Boolean(
+        process.env.GITHUB_TOKEN ?? process.env.GH_TOKEN,
+      ),
+    }
+  }
   const request = resolveProviderRequest({
     model: process.env.OPENAI_MODEL,
     baseUrl: process.env.OPENAI_BASE_URL,