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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.219 24 Jul 2026

MCP config warns about stray whitespace in values

You'll notice

Useful3 Signal0

MCP

MCP config now warns when a value has stray leading or trailing whitespace instead of silently using it.

What

Loading MCP server entries now warns when a value has leading or trailing whitespace, naming the fields involved, because the values are used exactly as written.

Details

the warning tells you to strip the whitespace rather than doing it for you
reserved-name rejections now carry a machine-readable reserved_name code alongside the existing message

Evidence

Leading or trailing whitespace in:

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

See this entry in the whole of v2.1.219 →