Follow Discord
Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.309 ·

Replacing large project documents gets a new refusal and a staged change

project_write can now refuse a replace because the document is too large, and can send the server an extra value when a remote switch is on

Nothing to try yet In Development
JSON All of v2.1.309
Nothing to try yetTier: how much it should matter to you
3Useful: my rating, 1 to 5
4Signal: worth watching, 1 to 5
ProjectsArea: what it touches
In DevelopmentKind: in v2.1.309,
What probably matters to youSection of the release

Unclear It is not clear what the extra value sent to the server changes about a replace.

What

Two things change when Claude uses the project_write tool to replace a project document:

  • project_doc_too_large_to_replace is a new refusal. Claude Code uses it when the server answers that the document is too large to replace. This can happen whatever the remote switch below says.
  • For replaces that do not use a local_path, Claude Code can now send the server an extra value. It only does this when a remote switch is on. That switch is off unless it is turned on remotely. When it is off, the extra value is left empty.
Why

This looks like a change to how large project documents are replaced that is being rolled out in stages. Even without the switch, a replace can now fail with the new too-large refusal.

Read from
Feature flag
tengu_toasty_owl Not enough to say

Nothing here resolved what this flag was doing on this version, so nothing here should be read as on or off.

This account: no value returned · anonymous baseline: no value returned · compiled default in v2.1.309: off

These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.

Read once, for one account on one subscription tier, against v2.1.309. It isn't a statement about your account. What a flag value here can and cannot tell you

How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtIt is not clear what the extra value sent to the server changes about a replace.
The name it cites is new in this buildNew in this build: tengu_toasty_owl

See this entry in the whole of v2.1.309 →

Feedback