Three new environment variables

Three new env vars tune the read-only memory notice, async agent stall timeout and check-in interval.

Use it now Notable No documentation found New Features

JSON All of v2.1.248

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Environment VariablesArea: what it touches

New FeaturesKind: in v2.1.248, 27 Aug 26

What probably matters to youSection of the release

What

CLAUDE_CODE_DISABLE_MEMORY_RO_UNSAVED_NOTICE suppresses the notice about unsaved edits to read-only memory. CLAUDE_ASYNC_AGENT_STALL_TIMEOUT_MS overrides the async-agent stall timeout, which otherwise defaults to 600000 ms (10 minutes). CLAUDE_CODE_COORDINATOR_WORKER_CHECKIN_SECONDS sets the coordinator worker check-in interval. All three are unset by default.

Details

Each is a new entry in the environment-variable allowlist and each has exactly one reader in the build.
The coordinator check-in variable is consulted on only one code path, so it does not apply everywhere.

Usage

CLAUDE_ASYNC_AGENT_STALL_TIMEOUT_MS=1200000 claude

Evidence

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Read from

The build it came inv2.1.248

27 Aug 2026 · 876 entries, this one is #74.

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Names in this entry

envCLAUDE_CODE_DISABLE_MEMORY_RO_UNSAVED_NOTICE
Writes into read-only memory stores now warn they were saved locally only and will be overwritten.
envCLAUDE_ASYNC_AGENT_STALL_TIMEOUT_MS
Stall timeout in milliseconds for subagents. Default 600000 (10 minutes); if you raise CLAUDE_STREAM_IDLE_TIMEOUT_MS while the stream watchdog is on, the default rises with it, as Handle slow or stalled API responses describes. The timer resets on each streaming progress event; if no progress arrives within the window, Claude Code aborts the subagent and reports the stall to the parent
envCLAUDE_CODE_COORDINATOR_WORKER_CHECKIN_SECONDS
Set an interval and your coordinator session gets periodic worker status nudges listing each worker's activity.

Is this right?

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.