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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 v2.1.63 28 Feb 2026

claude.ai MCP Servers Enabled by Default

The claude.ai MCP server integration has changed from opt-in to enabled by default (still GrowthBook-gated for rollout). Users who previously had to set ENABLE_CLAUDEAI_MCP_SERVERS=true no longer need to. To opt out, set ENABLE_CLAUDEAI_MCP_SERVERS=false.

Evidence

Changed message from "require ENABLE_CLAUDEAI_MCP_SERVERS=true" (v2.1.62) to "enabled by default (GrowthBook-gated). To opt out, set ENABLE_CLAUDEAI_MCP_SERVERS=false" (v2.1.63)

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

See this entry in the whole of v2.1.63 →