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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 v2.1.172 10 Jun 2026

--plugin-dir-no-mcp Flag

What

A new --plugin-dir-no-mcp flag that loads a plugin directory without also reading its .mcp.json file. Useful when the SDK host already owns and manages the plugin's MCP connections.

Usage

claude --plugin-dir-no-mcp <path>

Details

Behaves exactly like --plugin-dir except the engine skips .mcp.json / mcpServers discovery for that plugin
Equivalent behavior is also available as a setting: noMcp: true in the plugin frontmatter
Intended for SDK hosts that register MCP servers themselves rather than delegating to the engine

Evidence

New flag definition and help text (search for "Like --plugin-dir but the engine will not read this plugin's .mcp.json")

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

See this entry in the whole of v2.1.172 →