- Add AntigravityTokenRefreshError custom error class with code, description, and status fields
- Implement parseOAuthErrorPayload() for parsing Google's various OAuth error response formats
- Add retry logic with exponential backoff (3 retries, 1s→2s→4s delay) for transient failures
- Add special handling for invalid_grant error - immediately throws without retry and clears caches
- Add invalidateProjectContextByRefreshToken() for selective cache invalidation
- Update fetch.ts error handling to work with new error class and cache invalidation
🤖 Generated with assistance of OhMyOpenCode (https://github.com/code-yeongyu/oh-my-opencode)
- Add user reviews section to READMEs (EN, KO, JA, ZH-CN)
- Update Antigravity request.ts: change default model from gemini-3-pro-preview to gemini-3-pro-high
- Enhance config-manager.ts: add full model specs (name, limit, modalities) to provider config
- Add comprehensive test suite for config-manager (config-manager.test.ts)
🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)
When project ID fetching failed, an empty string was returned causing 404 errors on API requests. Now uses ANTIGRAVITY_DEFAULT_PROJECT_ID as fallback:
- isFreeTier(): Returns true when tierId is undefined (free tier by default)
- Import ANTIGRAVITY_DEFAULT_PROJECT_ID constant
- Replace empty project ID returns with fallback in all code paths:
- When loadCodeAssist returns null
- When PAID tier is detected
- When non-FREE tier without project
- When onboard/managed project ID fetch fails
Matches behavior of NoeFabris/opencode-antigravity-auth implementation.
🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)
- Added isFreeTier() helper to match 'free', 'free-tier', or any tier starting with 'free'
- Replaced all hardcoded 'FREE' comparisons with isFreeTier() calls
- Fixes issue where FREE tier users couldn't authenticate due to tier ID mismatch
- Added comprehensive debug logging for troubleshooting (ANTIGRAVITY_DEBUG=1)
- Verified: onboardUser API now correctly called for FREE tier users
🤖 Generated with assistance of OhMyOpenCode (https://github.com/code-yeongyu/oh-my-opencode)
- Removed random project ID generation (doesn't work for FREE tier)
- Added onboardManagedProject() to call onboardUser API for server-assigned managed project ID
- Updated type definitions: AntigravityUserTier, AntigravityOnboardUserPayload
- FREE tier users now get proper project IDs from Google instead of PERMISSION_DENIED errors
- Reference: https://github.com/shekohex/opencode-google-antigravity-auth🤖 Generated with assistance of OhMyOpenCode (https://github.com/code-yeongyu/oh-my-opencode)
This fix adds CLIProxyAPI-compatible random project ID generation when loadCodeAssist API fails to return a project ID. This allows FREE tier users to use the API without RESOURCE_PROJECT_INVALID errors.
Changes:
1. Added generateRandomProjectId() function matching CLIProxyAPI implementation
2. Changed fallback from empty string "" to generateRandomProjectId()
3. Cache all results (not just when projectId exists)
4. Removed unused ANTIGRAVITY_DEFAULT_PROJECT_ID import
🤖 Generated with assistance of OhMyOpenCode (https://github.com/code-yeongyu/oh-my-opencode)
- Add retry logic for 403 GCP permission errors (max 10 retries)
- Implement exponential backoff with 2s cap (200ms → 400ms → 800ms → 2000ms)
- Detect patterns: PERMISSION_DENIED, Cloud AI Companion API not enabled, etc.
🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)
- Add isRetryableResponse() to detect SUBSCRIPTION_REQUIRED 403 errors for retry handling
- Remove JSDoc comments from isRetryableError() for clarity
- Add debug logging for request/response details (streaming flag, status, content-type)
- Refactor transformStreamingResponse() to use TransformStream for true streaming
- Replace buffering approach with incremental chunk processing
- Implement createSseTransformStream() for line-by-line transformation
- Reduces memory footprint and Time-To-First-Byte (TTFB)
- Update SSE content-type detection to include alt=sse URL parameter
- Simplify response transformation logic for non-streaming path
- Add more granular debug logging for thought signature extraction
🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)
- Add message-converter.ts for OpenAI messages to Gemini contents conversion
- Use SKIP_THOUGHT_SIGNATURE_VALIDATOR as default signature (CLIProxyAPI approach)
- Restore loadCodeAssist API call to get user's actual project ID
- Improve debug logging for troubleshooting
- Fix tool normalization edge cases
🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)
Gemini 3 Pro requires thoughtSignature on function call blocks in
subsequent requests. This commit:
- Add thought-signature-store for session-based signature storage
- Extract signature from both streaming (SSE) and non-streaming responses
- Inject signature into functionCall parts on subsequent requests
- Maintain consistent sessionId per fetch instance
Debug logging available via ANTIGRAVITY_DEBUG=1
🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)
- Separate Google Antigravity auth to 'oh-my-opencode/google-auth' subpath
- 'oh-my-opencode/auth' now exports OpenAI Codex auth plugin
- Implement dynamic port allocation to avoid port conflicts
- Add userAgent, requestId, sessionId fields for Antigravity API compatibility
- Add debug logging for troubleshooting (ANTIGRAVITY_DEBUG=1)
🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)
Pass-through path (non-string body) now preserves Authorization header.
This ensures authentication works even when request transformation is bypassed.
🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)
- Implement createGoogleAntigravityAuthPlugin factory function
- Add OAuth method with PKCE for Google authentication
- Create custom fetch interceptor loader for Antigravity API
- Update auth.ts to export Google Antigravity plugin as default
- Update barrel export in antigravity/index.ts
- Add Google Antigravity auth location to AGENTS.md
🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)
