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Kyle Carberry
2bdacae5f5
## Summary Adds automatic retry with exponential backoff for transient LLM errors during chat streaming and title generation. Inspired by [coder/mux](https://github.com/coder/mux)'s retry mechanism. ## Key Behaviors - **Infinite retries** with exponential backoff: 1s → 2s → 4s → ... → 60s cap - **Deterministic delays** (no jitter) - **Error classification**: retryable (429, 5xx, overloaded, rate limit, network errors) vs non-retryable (auth, quota, context exceeded, model not found, canceled) - **Retry status published to SSE stream** so frontend can show "Retrying in Xs..." UI - **Title generation** retries silently (best-effort, nil onRetry callback) ## New Package: `coderd/chatd/chatretry/` | File | Purpose | |------|---------| | `classify.go` | `IsRetryable(err)` and `StatusCodeRetryable(code)` | | `backoff.go` | `Delay(attempt)` — exponential doubling with 60s cap | | `retry.go` | `Retry(ctx, fn, onRetry)` — infinite loop with context-aware timer | ## Test Helpers: `coderd/chatd/chattest/errors.go` Anthropic and OpenAI error response builders for use in chattest providers: - `AnthropicErrorResponse()`, `AnthropicOverloadedResponse()`, `AnthropicRateLimitResponse()` - `OpenAIErrorResponse()`, `OpenAIRateLimitResponse()`, `OpenAIServerErrorResponse()` ## SDK Changes: `codersdk/chats.go` - New `ChatStreamEventType: "retry"` - New `ChatStreamRetry` struct with `Attempt`, `DelayMs`, `Error`, `RetryingAt` fields - TypeScript types auto-generated ## Changed Files - `coderd/chatd/chatloop/chatloop.go` — wraps `agent.Stream()` in `chatretry.Retry()` - `coderd/chatd/chatd.go` — publishes retry events to SSE stream with logging - `coderd/chatd/title.go` — wraps `model.Generate()` in silent retry - `coderd/chatd/chattest/anthropic.go` / `openai.go` — error injection support ## Tests 42 tests covering classification (33), backoff (9), and retry scenarios (8).