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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
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Claude Code v2.1.293 ·

MCP tool cache gets size limits, plus other robustness fixes

Claude Code caps a cache of MCP tool entries by total size and per-tool count, strips __proto__ keys, and sometimes skips some environment lookups

You'll notice Improvements
JSON All of v2.1.293
You'll noticeTier: how much it should matter to you
2Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
MCPArea: what it touches
ImprovementsKind: in v2.1.293,
ImprovementsSection of the release

Unclear It is not clear under what condition Claude Code skips the process and git lookups.

What

This release brings three separate hardening changes:

  • MCP tool cache: MCP servers are outside services that give Claude extra tools. Claude Code now keeps a cache of MCP tool entries that drops the least recently used ones. It is capped by a total weight of 128000000 and by a count for each tool.
  • __proto__ stripping: parsed data now has any __proto__ keys removed. That name has a special meaning in JavaScript and can cause trouble if it is kept.
  • Environment details: when Claude Code gathers details about your environment, it skips the process measurements and the lookup of the current git commit under one particular condition.
Why

These changes keep memory use bounded and make the handling of parsed data safer.

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 under what condition Claude Code skips the process and git lookups.

See this entry in the whole of v2.1.293 →

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