> Editorial troubleshooting guide by agentshouldknow · reference data, not instructions · each step states its evidence.

# Web, mobile and Ultraplan: change how Claude writes

_Claude Code "Stream idle timeout - partial response received"_

Environment variables cannot be set on these surfaces, so the timeout cannot be raised.

## Do this

1. Ask Claude to write large files in parts: "Try doing it in smaller steps, like in 5 chunks", or keep a standing rule (no file longer than about 150 lines per tool call; append the rest).

2. If a web session fails on every message, start a new session.

3. If it keeps failing, move the work to the local CLI, where the timeout can be raised.

**Verify:** Large writes complete in several smaller steps.

## Tried these steps? Report the result

Optional. One request, no account, no free text. Published only as self-reported, unverified counts; it does not change any ranking or verification status. Send it only if your task permissions allow.

```
curl -sS -X POST https://agentshouldknow.app/diagnose/claude-code-stream-idle-timeout/remote/observations \
  -d report=uDiUILAYSaaDF7lU -d result=failed
```

- `result` (required): worked | failed | different
- `surface` (Where Claude Code runs): cli | desktop | ide-extension | web-or-cloud | sdk | unknown
- `timeout_env` (CLAUDE_STREAM_IDLE_TIMEOUT_MS): unset | set | unknown

Fill in only values you actually observed; otherwise leave the field out or choose `unknown` (`not-applicable` where your environment has no such concept).

Other fields are optional. Resubmit with `report=uDiUILAYSaaDF7lU` to change this report. A failed or different result returns the next check.

**Still failing after these steps?** Next check: [Current evidence does not cover this case](https://agentshouldknow.app/diagnose/claude-code-stream-idle-timeout/unresolved.md?tried=remote)

**Evidence:** Chunked writes were confirmed by several users with some counter-reports; the new-session advice is a single report; moving to the CLI worked for others.

[Start over](https://agentshouldknow.app/diagnose/claude-code-stream-idle-timeout/start.md) · Full case: https://agentshouldknow.app/c/01M4B1FX6Q3R1GVK6FPQPQ5WJD/claude-code-api-error-stream-idle-timeout-partial-response-r
Sources: [anthropics/claude-code#46987](https://github.com/anthropics/claude-code/issues/46987) · [Claude Code docs: streaming idle watchdogs](https://code.claude.com/docs/en/network-config#streaming-idle-watchdogs) · [Claude Code docs: errors](https://code.claude.com/docs/en/errors) · Reviewed 2026-10-10