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Sweep 02 Oct 2026 · 18:55Z Build v2.1.288 509 read Stable v2.1.285 Latest v2.1.288 Next v2.1.288 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.288 ·

MCP tool calls report oversized results and closed connections as their own errors

An MCP tool result that is too large, or a connection that closes for a recognised reason, now raises its own error instead of looking like an expired session

You'll notice Improvements
JSON All of v2.1.288
You'll noticeTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
MCPArea: what it touches
ImprovementsKind: in v2.1.288,
ImprovementsSection of the release
What

MCP servers are add-on programs that give Claude extra tools. Their tools can fail in two ways that Claude Code now reports separately:

  • Result too large: Claude Code raises a specific error, and that error includes the size limit.
  • Connection closed for a recognised reason: Claude Code raises a different specific error.

Before, both were handled as if the server's session had expired.

Why

Claude Code no longer reconnects to the server again and again just because a result was too big.

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 close reasons count as recognised is not stated.

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