Previously, `CreateChat` inserted the `chats` row with the DB default
status (`waiting`), then updated it to `pending` in the same transaction
via `setChatPendingWithStore`. This wasted two extra queries per chat
creation (`GetChatByID` + `UpdateChatStatus`) and rewrote the same row
immediately after inserting it.
Now `CreateChat` passes the status directly to `InsertChat`, so the row
is written once in its final create-time state. The
`setChatPendingWithStore` helper is removed entirely. `InsertChat` now
requires an explicit `status` parameter at all callsites instead of
relying on a DB column default.
## Motivation
On an experimental branch we're trialing firing all chatd notifications
from plpgsql triggers. The old two-step insert made that awkward: in an
`AFTER INSERT` trigger, `NEW` only contained the insert-time row
(`waiting`), not the final committed state (`pending`). To emit the
correct event payload the trigger had to be deferred and re-read the row
from `chats` at commit time.
With this change, `NEW` already contains the correct row to publish — no
deferred trigger, no extra `SELECT`, simpler and cheaper trigger logic.
That said, this seems like a worthwhile change regardless of the trigger
experiment: writing the final row state once removes unnecessary DB work
on every chat creation and makes the create path easier to reason about.
These chatd relay tests were seeding chats through
`subscriber.CreateChat(...)`, which wakes the subscriber and can race
local acquisition against the intended remote-worker setup.
Seed waiting and remote-running chats directly in the database instead,
and point the default OpenAI provider at a local safety-net server so
accidental processing fails locally instead of reaching the live API.
Closes https://github.com/coder/internal/issues/1430
> **PR Stack**
> 1. **#23351** ← `#23282` *(you are here)*
> 2. #23282 ← `#23275`
> 3. #23275 ← `#23349`
> 4. #23349 ← `main`
---
## Summary
`chatretry.Retry()` used pure exponential backoff (1 s, 2 s, 4 s, …) and
never consulted provider `Retry-After` headers. Fantasy's
`ProviderError` carries `ResponseHeaders` including `Retry-After`, but
`chaterror.Classify()` only parsed error text and silently dropped the
structured transport metadata.
This makes `Retry-After` a first-class signal in the classification →
retry pipeline.
<img width="853" height="346" alt="image"
src="https://github.com/user-attachments/assets/65f012b6-8173-43d2-957e-ab9faddea525"
/>
## Changes
### `coderd/chatd/chaterror/classify.go`
- Added `RetryAfter time.Duration` field to `ClassifiedError` — a
normalized minimum retry delay derived from provider response metadata.
- `Classify()` now calls `extractProviderErrorDetails()` before falling
back to text heuristics. Structured `ProviderError.StatusCode` takes
priority over regex extraction.
- `normalizeClassification()` preserves and clamps `RetryAfter`.
### `coderd/chatd/chaterror/provider_error.go` (new)
Provider-specific extraction, isolated from the text-based
classification logic:
- `extractProviderErrorDetails()` unwraps `*fantasy.ProviderError` from
the error chain via `errors.As`.
- `retryAfterFromHeaders()` parses headers in priority order:
1. `retry-after-ms` (OpenAI-specific, millisecond precision)
2. `retry-after` (standard HTTP — integer seconds or HTTP-date)
- Case-insensitive header key lookup.
### `coderd/chatd/chatretry/chatretry.go`
- `effectiveDelay(attempt, classified)` computes `max(Delay(attempt),
classified.RetryAfter)` — the provider hint acts as a floor without
weakening the local exponential backoff.
- `Retry()` now uses `effectiveDelay` and passes the effective delay to
both `onRetry(...)` and the sleep timer, so downstream payloads, logs,
and the frontend countdown stay aligned automatically.
### Tests
- `classify_test.go`: Structured provider status + `Retry-After`
extraction, `retry-after-ms` priority, HTTP-date parsing, invalid header
fallback, `WithProvider` preservation.
- `chatretry_test.go`: Retry-after-as-floor semantics — longer hint
wins, shorter hint keeps base delay.
## Design notes
- **No SDK/API/frontend changes needed.** `codersdk.ChatStreamRetry`
already carries `DelayMs` and `RetryingAt`, and the frontend already
consumes them. The fix is purely in the server-side delay computation.
- **Existing retryability rules unchanged.** This fixes *when* we sleep,
not *whether* an error is retryable.
- **Provider hint is a floor:** `max(baseDelay, RetryAfter)` ensures we
never retry earlier than the provider asks, and never weaken our own
backoff curve.
> **PR Stack**
> 1. #23351 ← `#23282`
> 2. #23282 ← `#23275`
> 3. **#23275** ← `#23349` *(you are here)*
> 4. #23349 ← `main`
---
## Summary
Extracts a structured error classification subsystem for agent chat
(`chatd`) so that retry and error payloads carry machine-readable
metadata — error kind, provider name, HTTP status code, and retryability
— instead of raw error strings.
This is the **backend half** of the error-handling work. The frontend
counterpart is in #23282.
## Changes
### New package: `coderd/chatd/chaterror/`
Canonical error classification — extracts error kind, provider, status
code, and user-facing message from raw provider errors. One source of
truth that drives both retry policy and stream payloads.
- **`kind.go`**: Error kind enum (`rate_limit`, `timeout`, `auth`,
`config`, `overloaded`, `unknown`).
- **`signals.go`**: Signal extraction — parses provider name, HTTP
status code, and retryability from error strings and wrapped types.
- **`classify.go`**: Classification logic — maps extracted signals to an
error kind.
- **`message.go`**: User-facing message templates keyed by kind +
signals.
- **`payload.go`**: Projectors that build `ChatStreamError` and
`ChatStreamRetry` payloads from a classified error.
### Modified
- **`codersdk/chats.go`**: Added `Kind`, `Provider`, `Retryable`,
`StatusCode` fields to `ChatStreamError` and `ChatStreamRetry`.
- **`coderd/chatd/chatretry/`**: Thinned to retry-policy only;
classification logic moved to `chaterror`.
- **`coderd/chatd/chatloop/`**: Added per-attempt first-chunk timeout
(60 s) via `guardedStream` wrapper — produces retryable
`startup_timeout` errors instead of hanging forever.
- **`coderd/chatd/chatd.go`**: Publishes normalized retry/error payloads
via `chaterror` projectors.
- Moves `coderd/chatd/`, `coderd/gitsync/`, `enterprise/coderd/chatd/`
under `x/` parent directories to signal instability
- Adds `Experimental:` glue code comments in `coderd/coderd.go`
> 🤖 This PR was created with the help of Coder Agents, and was
reviewed by my human. 🧑💻
Kyle Carberry