AI BriefingAllowlists in Managed Settings Can Create a False Sense of Security When Using Claude Code + MCP (GitHub Copilot MCP, Sentry, etc.)
Key point
An open-source CLI tool has been released to diagnose the MCP allowlist bypass issue in Claude Code.
Details
A security vulnerability has been discovered where the MCP allowlist in Claude Code's managed settings is not fully enforced, potentially allowing blocked servers to run. In response, an open-source CLI tool named managed-mcp-doctor has been released to diagnose this issue.
This tool identifies configuration errors in MCP servers shared in enterprise environments, such as GitHub Copilot MCP and Sentry. The key checks include:
- Unblocked Managed Servers: Cases where the deniedMcpServers setting is missing
- Configuration Priority Conflicts: Conflicts between remote managed settings and local file settings
- Missing Required Flags: The allowManagedMcpServersOnly option is not applied
Developers can run it immediately using the npx managed-mcp-doctor command, generate recommended configuration files with the --fix option, or integrate it into CI pipelines using the --json/--sarif formats.
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