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Sweep 01 Oct 2026 · 17:27Z Build v2.1.287 508 read Stable v2.1.285 Latest v2.1.287 Next v2.1.287 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.286 ·

MCP tool calls can skip automatic backgrounding in some sessions

Under a new condition, an MCP tool call no longer gets a timer for moving itself to the background, and plugin sync logs two more details

You'll notice Improvements
JSON All of v2.1.286
You'll noticeTier: how much it should matter to you
1Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
MCPArea: what it touches
ImprovementsKind: in v2.1.286,
ImprovementsSection of the release
What

MCP servers are outside programs that give Claude Code extra tools. When Claude calls one of those tools, Claude Code can set a timer that moves a long-running call into the background so the conversation is not held up. There is now a condition under which that timer is left unset for the call, so it is not moved to the background automatically.

Two other changes sit alongside this:

  • The record Claude Code logs when plugin syncing skips MCP servers now carries two extra details, where before it carried none.
  • The server discovery that runs when the working folder changes, and during plugin sync, now passes along an extra filter.
Why

In the sessions where the new condition applies, a slow MCP tool call may stay in the foreground until it finishes instead of moving to the background.

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 which sessions meet the condition that turns off automatic backgrounding.

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