Feature request: add a provider/API error hook for rate limits, 5xx, timeouts, and stream disconnects

Summary

Codex hooks currently cover prompt/tool/permission/session/stop lifecycle events, but there is no hook for model/provider request failures such as 429, 503, timeout, EOF, connection reset, or stream disconnect.

This makes it hard to build reliable recovery, notification, backoff, or automation workflows around long-running Codex tasks, because Stop is not guaranteed to fire when the turn fails before normal completion.

Proposed event

Add a hook event such as ProviderError or TurnError.

It should fire when a model/provider request fails after Codex has enough context to identify the current thread/session/turn, including cases like:

• HTTP 429 / rate limit
• HTTP 5xx / provider unavailable
• timeout
• unexpected EOF
• connection reset
• stream disconnected before completion

Suggested payload

{
  "hook_event_name": "ProviderError",
  "session_id": "...",
  "thread_id": "...",
  "turn_id": "...",
  "cwd": "...",
  "model": "...",
  "provider": "...",
  "status_code": 429,
  "error_kind": "rate_limit",
  "retry_after_ms": 60000,
  "message": "redacted/safe error summary",
  "will_retry": false,
  "attempt": 1
}

Why this matters

External workflow layers can then implement safe behavior without scraping transcripts:

• notify the user or monitoring system
• schedule backoff/retry
• mark a long-running automation as provider-interrupted
• safely resume the same session later
• distinguish provider failure from user cancellation, task completion, or deterministic code/test failure

Important boundary

This hook should not expose raw credentials, full request bodies, or private provider payloads. A redacted error summary plus status/error kind is enough.

I am not asking for this to replace Codex's internal retry behavior. The goal is to expose a reliable lifecycle surface for integrations that need to react when a turn ends because the provider request failed before normal Stop handling.