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Sweep 03 Nov 2026 · 22:27Z Build v2.1.318 536 read Stable v2.1.311 Latest v2.1.318 Next v2.1.318 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.318 ·

More groundwork for running MCP tools from inside a REPL environment

Code that presents MCP tools as callable inside a REPL environment gains further branches, all limited to a build check

Nothing to try yet In Development
JSON All of v2.1.318
Nothing to try yetTier: how much it should matter to you
2Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
REPL ModeArea: what it touches
In DevelopmentKind: in v2.1.318,
In DevelopmentSection of the release

Unclear It is not clear what the build check tests, so it is unknown whether any user can reach this.

What

More code for a REPL-based tool setup is in this build. A REPL is an environment where code is typed and run one piece at a time. MCP tools are tools from outside services. Each of these runs only when a build check passes.

  • MCP tools are described as "callable inside the REPL environment" instead of always being described as available automatically.
  • Calls to helpers from inside scripts are tracked separately.
  • Claude Code records which tool call another call is running inside.
  • Spawned sessions get an option to choose a stand-in.
Why

This looks like early scaffolding for running tools through scripts rather than as separate top-level tools.

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 build check tests, so it is unknown whether any user can reach this.

See this entry in the whole of v2.1.318 →

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