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Sweep 10 Nov 2026 · 02:18Z Build v2.1.322 539 read Stable v2.1.311 Latest v2.1.322 Next v2.1.322 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.321 ·

Claude Code can read a list of MCP tools to deny

Claude Code can now check and merge a list of blocked MCP tools, called mcpDeniedTools, into its settings

Use it now Notable No documentation found New Features
JSON All of v2.1.321
Use it nowTier: how much it should matter to you
5Useful: my rating, 1 to 5
4Signal: worth watching, 1 to 5
MCPArea: what it touches
New FeaturesKind: in v2.1.321,
What probably matters to youSection of the release

Unclear It is not clear where the mcpDeniedTools list comes from or whether anything uses it yet.

What

MCP tools are extra tools that Claude Code gets from outside programs called MCP servers. Claude Code now has code that reads a list named mcpDeniedTools and adds it to its settings when the list is valid. A valid list has to meet these rules:

  • Each entry is text made only of allowed characters.
  • Each entry has to match the name of an MCP tool.
  • The list cannot be longer than a set maximum.
Why

This may be a way, possibly set by an organization or from a remote source, to block particular MCP tools by name.

Read from
Names in the bundlemcpDeniedTools
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 where the `mcpDeniedTools` list comes from or whether anything uses it yet.

See this entry in the whole of v2.1.321 →

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