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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 v2.1.193

disableSideloadFlags Enterprise Setting

What

A new managed setting that blocks --plugin-dir, --plugin-url, --agents, and non-SDK --mcp-config CLI flags at startup, closing the CLI-flag bypass of strictKnownMarketplaces.

Details
  • Only honored when set in managed settings (policy-controlled). Ignored in user, project, or local settings.
  • When a blocked flag is used, Claude Code exits with: "X is disabled by your organization's managed settings (disableSideloadFlags). Plugins, custom agents, and MCP servers can only be loaded from sources your administrator has approved."
  • Pair with allowedMcpServers for per-server MCP control; this setting does not gate other MCP entry points such as claude mcp add, SDK setMcpServers, or .mcp.json.
  • Does not block MCP servers configured through approved marketplace sources.
Evidence

New setting description (search for "disableSideloadFlags" or "rejects the --plugin-dir, --plugin-url, --agents")

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

See this entry in the whole of v2.1.193 →