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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 v2.1.85 26 Mar 2026

Built-in MCP Server Toggle [Gradual Rollout]

What

A mechanism to toggle built-in MCP servers on/off.

Status

Feature-flagged behind tengu_builtin_mcp_toggle.

Details

Tracks the server name and whether it's being enabled or disabled
Related to managing a disabledMcpServers list in application state
When enabled, users will be able to selectively disable built-in MCP servers

Evidence

MCP toggle tracking (gated by tengu_builtin_mcp_toggle, search for "disabledMcpServers")

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

See this entry in the whole of v2.1.85 →