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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 v2.1.305 ·

MCP server settings are checked for variables outside the environment section

Claude Code now checks whether MCP server settings outside the environment section contain something that looks like a variable

Under the hood Internal Changes
JSON All of v2.1.305
Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
MCPArea: what it touches
Internal ChangesKind: in v2.1.305,
Internal ChangesSection of the release

Unclear What Claude Code does when it finds a variable-like value outside the environment section is not stated.

What

MCP servers are outside programs that give Claude extra tools, and their settings can contain variables that Claude Code fills in from your environment. The way Claude Code fills these in has been reorganized. It now also checks whether any setting other than the server's environment section contains something that looks like a variable.

Why

There is no stated effect yet. The new check may be used to warn about variables in other parts of a server's settings.

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 doubtWhat Claude Code does when it finds a variable-like value outside the environment section is not stated.

See this entry in the whole of v2.1.305 →

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