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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 ·

SDK apps can receive tool calls made by nested subagents

Programs built on the SDK can now receive tool calls and results from subagents nested inside other subagents

Use it now New Features
JSON All of v2.1.290
Use it nowTier: how much it should matter to you
4Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
SDKArea: what it touches
New FeaturesKind: in v2.1.290,
What probably matters to youSection of the release

Unclear It is not clear which programs report that they accept nested subagent tool calls.

What

A program built on the Claude Agent SDK can now receive messages from a nested subagent, which is a helper agent started by another helper agent. A message is passed on when either holds:

  • forwardSubagentText is set, in which case nested subagent messages are forwarded.
  • The program reports that it accepts nested subagent tool calls, in which case only tool calls and tool results are forwarded, and only when a remote switch allows it.

That switch defaults to on when the server sends nothing.

Why

SDK or remote programs may start receiving nested subagent tool calls and results they did not get before, so code reading those messages should be ready for them.

Read from
Feature flag
tengu_starry_squid 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 doubtIt is not clear which programs report that they accept nested subagent tool calls.
The name it cites is new in this buildNew in this build: tengu_starry_squid

See this entry in the whole of v2.1.290 →

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