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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.251 ·

Environment variable to stop MCP tasks running in the background

Set CLAUDE_CODE_DISABLE_MCP_TASK_BACKGROUND to keep MCP tasks in the foreground.

Use it now Notable No documentation found New Features
JSON All of v2.1.251
Use it nowTier: how much it should matter to you
4Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
MCPArea: what it touches
New FeaturesKind: in v2.1.251,
What probably matters to youSection of the release
What

CLAUDE_CODE_DISABLE_MCP_TASK_BACKGROUND joins the recognised CLAUDE_CODE_DISABLE_* toggles. Backgrounding of MCP tasks is on unless you set it, so this is the opt-out for people who want those tasks to run in the foreground.

Details
  • Documented alongside the other disable-style environment variables.
Usage
CLAUDE_CODE_DISABLE_MCP_TASK_BACKGROUND=1 claude
Evidence

CLAUDE_CODE_DISABLE_MCP_TASK_BACKGROUND

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

Read from
Names in the bundleCLAUDE_CODE_DISABLE_MCP_TASK_BACKGROUND
How sure we are
One source agreesOne thing we can check says the same as this entry.
The name it cites is new in this buildNew in this build: CLAUDE_CODE_DISABLE_MCP_TASK_BACKGROUND

See this entry in the whole of v2.1.251 →

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