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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.308 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.238 ·

MCP instruction blocks re-emit when a server's instructions change

Changed MCP server instructions would be re-sent instead of suppressed, but that needs the disabled discovery cache.

Nothing to try yet In Development
JSON All of v2.1.238
Nothing to try yetTier: how much it should matter to you
2Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
MCPArea: what it touches
In DevelopmentKind: in v2.1.238,
In DevelopmentSection of the release

Instruction blocks now store each server's own text so changes can re-emit, gated on the MCP discovery cache which is off by default.

What

The record of MCP server instructions now keeps each server's own instruction text next to the rendered block, so a still-connected server whose instructions changed gets its block re-sent instead of suppressed as already present. Re-emitting on change requires the MCP discovery cache, which is not enabled by default.

Evidence

tengu_mcp_instructions_pool_change

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.238 →

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