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* feat: add OpenAI format provider support Add bidirectional format conversion for OpenAI Chat Completions API, enabling fallback providers like OpenRouter, Together AI, and any OpenAI-compatible endpoint. Changes: - Add format field to ProviderConfig (anthropic|openai) - Implement request/response conversion with tool_use support - Add streaming SSE conversion via TransformStream - Update admin UI with format selector - Add 37 comprehensive tests (259 total passing) - Validate format field at API boundary Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com> * test: improve format-converter coverage to 99%+ Add tests for edge cases: non-string/non-array content, invalid JSON in stream, interleaved text+tool_calls, flush with remaining buffer, and usage in regular chunks. * chore: add Codecov configuration with relaxed thresholds Allow coverage to decrease by up to 5% and set patch target to 70% to prevent CI failures on minor coverage fluctuations. Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com> * feat: test multiple Claude models in testConnection with mapping suggestions Refactor testProvider to test 4 models (Sonnet, Opus 4, Opus 4.6, Haiku) in parallel instead of a single hardcoded model. Shows per-model results in the admin UI and suggests adding model mappings when models fail without one configured. Also adds claude-opus-4-6-20250415 to CLAUDE_MODELS. * feat: add provider disable/enable toggle in admin panel Show Anthropic primary API as fixed first entry with toggle switch. Replace reorder arrow buttons with enable/disable toggles on all providers. Disabled providers are skipped during request routing. * test: add tests for provider disable/enable skipping behavior Verify disabled Anthropic primary and fallback providers are skipped during request routing, and that 502 is returned when all are disabled. --------- Co-authored-by: Claude Haiku 4.5 <noreply@anthropic.com>
…error messages, and logging format. Adjust provider configurations and enhance circuit breaker functionality. Remove DEBUG variable from wrangler configuration.
* feat: new fallback algo * docs: update documentation for circuit breaker implementation - Update CLAUDE.md with circuit breaker architecture details - Expand README.md with setup instructions - Add comprehensive testing guide - Update environment variables documentation - Add contribution guidelines - Expand runbook with troubleshooting steps Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
* feat: add structured logging and observability Implements comprehensive observability with structured JSON logging: - Add structured logger utility with JSON format output - Generate unique Request ID for end-to-end tracing - Return Request ID in response headers (X-Request-ID) - Support client-provided Request ID via header - Replace all console.log with structured events - Track latency for all provider attempts - Add 11 event types: request.*, provider.*, circuit_breaker.*, safety_valve.*, auth.*, config.* All logs include: - timestamp (ISO 8601) - level (debug/info/warn/error) - event type - requestId - structured data (provider, model, status, latency, error) Benefits: - Full request tracing via Request ID - Easy querying in Cloudflare Dashboard - Ready for Logpush to Grafana/Datadog/Sentry - Automatic tracing integration (already enabled in wrangler.jsonc) Documentation: - Added docs/observability.md with usage guide - Updated CLAUDE.md with observability section Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com> * fix: correct Headers type for x-request-id response header Convert Record<string, string> from cleanHeaders to Headers object before calling .set() method. * chore: update * feat: log reproducible curl command on request failure When all providers fail, emit a `request.debug_curl` log entry containing a copy-paste ready curl command that reproduces the original request to the proxy. Accessible via `npm run tail` for local debugging. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> --------- Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>
Replace the health check endpoint at / with a 302 redirect to /admin, preparing for login page support on the admin panel. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add loginPage export to admin.ts that renders a standalone login form. The page validates the admin token against /admin/config, stores it in localStorage for session persistence, and redirects to the admin panel on success. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Switch admin panel fetch calls from passing token as query parameter to using Authorization: Bearer header. This is more secure as tokens in query params can leak via server logs and referrer headers. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
…nel (#16) * feat: add GET /admin/provider-states endpoint Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * feat: add CSS for circuit breaker status badges Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * feat: show circuit breaker status badges on admin provider cards Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * feat: add manual reset button for provider circuit breaker Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * docs: add implementation plan for admin circuit breaker status --------- Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
* feat(rectifier): add type definitions for rectifier system * feat(rectifier): implement Anthropic API rectifier system Add automatic rectifier that detects and fixes Anthropic API request compatibility issues with third-party providers. Includes thinking signature rectification (removes thinking blocks, redacted_thinking blocks, and signature fields) and thinking budget rectification (adjusts budget_tokens and max_tokens to valid ranges). Each rectifier retries once per request to prevent infinite loops. Configurable via admin API endpoints with KV persistence. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * docs: add rectifier implementation plans Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
* feat: add GET /admin/provider-states endpoint Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * feat: add CSS for circuit breaker status badges Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * feat: show circuit breaker status badges on admin provider cards Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * feat: add manual reset button for provider circuit breaker Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * docs: add implementation plan for admin circuit breaker status * fix: syntax error in reset button onclick handler --------- Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
- Add `retry` field to ProviderConfig in types - Implement retry loop in `src/utils/provider.ts` for network and 5xx errors - Add retry configuration UI to Admin Panel provider modal - Exclude 4xx/429 errors from retry logic - Add exponential backoff (500ms * 2^attempt) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
When the safety valve is triggered (all providers in cooldown), the request was bypassing the thinking signature rectification logic. This caused 400 Invalid Signature errors to persist even when using the safety valve. This change adds the rectification logic to the safety valve execution path, ensuring that invalid thinking blocks are removed before retrying the request.
Updates request handling to remove the 'accept-encoding' header before forwarding requests to upstream providers. This ensures that the runtime handles compression negotiation automatically, preventing issues where the worker receives compressed error responses (like 403s) and logs them as binary garbage. Changes: - Added `cleanRequestHeaders` in `src/utils/headers.ts` to filter unsafe headers including `accept-encoding`. - Updated `src/index.ts` to use `cleanRequestHeaders` for primary and fallback requests. - Updated `src/utils/provider.ts` to exclude `accept-encoding` and use `cleanHeaders` for error responses. - Updated `src/admin.ts` to strip unsafe headers in provider testing. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
The x-anthropic-billing-header system message contains a 'cch' parameter that changes with every request, preventing effective prompt caching. This change strips that parameter while preserving the rest of the header. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Rectifier retry was using 30s timeout which was too short for large request bodies after stripping thinking blocks. When timeout occurred, the original 400 error was returned directly instead of trying fallback providers. Now uses 120s timeout and sets status to 504 on timeout so the request continues to fallback providers. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
…n panel, observability) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Deploying with
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| Status | Name | Latest Commit | Updated (UTC) |
|---|---|---|---|
| ✅ Deployment successful! View logs |
claude-code-fallback | 4823762 | Feb 18 2026, 03:50 PM |
Auto-detect orphaned tool_use blocks missing corresponding tool_result and inject dummy error tool_result to unblock the request. Integrated into primary, safety valve, and fallback provider flows. Also unify debug-skip header filtering (x-ccf-* prefix) and add error snippet to failure logs. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #23 +/- ##
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- Coverage 96.76% 85.64% -11.13%
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Files 7 15 +8
Lines 557 1198 +641
Branches 170 358 +188
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+ Hits 539 1026 +487
- Misses 17 171 +154
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Summary
A major update bringing several new features to the fallback proxy:
Test plan
npm test— all 367+ tests pass/adminnpm run tailshows structured JSON logs with request IDs🤖 Generated with Claude Code