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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 ·

Waiting for MCP servers can describe tools as available inside the REPL

In one mode, the tool that waits for MCP servers says their tools become callable inside the REPL instead of joining the main tool list

Under the hood Internal Changes
JSON All of v2.1.318
Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
REPL ModeArea: what it touches
Internal ChangesKind: in v2.1.318,
Internal ChangesSection of the release

Unclear It is not known what switches this REPL mode on, so readers cannot tell whether they will see it.

What

MCP servers are outside programs that give Claude extra tools. Claude Code has a tool that waits for these servers to finish connecting.

In a particular mode, the description of that waiting tool now tells Claude something different. Instead of saying the servers' tools will be added to its main list of tools, it says they become callable inside the REPL environment. A REPL is an interactive place where code is run line by line.

Related additions:

  • An error for when a built-in MCP server running inside Claude Code reaches beyond its own tools in this mode
  • A waiting step that follows status lines while it polls
Why

It points to a way of routing MCP tools through the REPL that is still being built.

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 known what switches this REPL mode on, so readers cannot tell whether they will see it.

See this entry in the whole of v2.1.318 →

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