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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.300 ·

Sessions with a tool host interface send Claude extra tools

When a session uses a tool host interface, Claude Code now adds an extra set of tools to the list sent to Claude

Under the hood Internal Changes
JSON All of v2.1.300
Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
4Signal: worth watching, 1 to 5
Tool HostArea: what it touches
Internal ChangesKind: in v2.1.300,
What probably matters to youSection of the release

Unclear Which tools are added, and what decides whether they are added, is not stated.

What

Tools are the actions Claude can take, such as reading files or running commands. When a session uses a tool host interface, Claude Code now adds an extra set of tools to the list it sends to Claude. Before, it sent only the tool host interface itself.

Why

In these sessions Claude can see, and so use, more tools than before.

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 doubtWhich tools are added, and what decides whether they are added, is not stated.

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