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Sweep 08 Oct 2026 · 18:53Z Build v2.1.295 516 read Stable v2.1.286 Latest v2.1.295 Next v2.1.295 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.290 ·

Extra unknown details in a tool request are now dropped instead of failing

When a tool request contains details the tool does not recognise, Claude Code can now drop them and try again

You'll notice Improvements
JSON All of v2.1.290
You'll noticeTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
ToolsArea: what it touches
ImprovementsKind: in v2.1.290,
ImprovementsSection of the release

Unclear Whether anything other than the plan mode check uses this is not clear.

What

When Claude uses a tool, it sends the tool a set of details. Claude Code checks those details against what the tool expects. If the only problem is extra details the tool does not recognise, Claude Code now removes them and checks again. This happens only when the tool's own check passes, and only when a remote switch allows it; that switch is on unless it is switched off remotely.

This is used when checking whether a tool call is read-only in plan mode, the mode where Claude plans changes without making them.

Why

Tool calls with stray extra details may now go ahead instead of producing an error.

Read from
Feature flag
tengu_tidy_eclipse 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 v2.1.290: on

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 v2.1.290. 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 doubtWhether anything other than the plan mode check uses this is not clear.
The name it cites is new in this buildNew in this build: tengu_tidy_eclipse

See this entry in the whole of v2.1.290 →

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