Check configured or proposed MCP servers against PolicyLayer registry records for identity, authentication posture, tool capabilities, risk grade and recent changes.
Install
- 1Add it in ChatGPT
Open Plugins in the ChatGPT sidebar (web or desktop), search for “MCP Precheck” and select +. You'll be asked to sign in to any connected service on first use. Then type @ in a chat to call it.
Skills 1
- mcp-precheck
Check MCP servers against the PolicyLayer registry before connecting to them. Use when you are about to add, install or configure any MCP server (editing .mcp.json or a client config, running `claude mcp add` or an npx-launched server), when your human asks you to evaluate or vet an MCP server, when asked to scan or review the MCP stack already configured on this machine, or when asked to install or remove the precheck hook.
Things to ask
- “Audit every MCP server configured. Flag anything risky, unknown or recently changed, and tell me what needs my decision.”
- “Before I connect this MCP server, check its identity, authentication, capabilities, risk grade and recent changes”
- “Review my MCP stack and propose enforceable deny rules for any dangerous tools. Ask before changing any settings.”
Disconnect or uninstall
- 1In ChatGPT
Disconnect an account in Settings → Apps or Plugins. To remove the plugin itself, open MCP Precheck in the Plugin Directory and select Uninstall plugin. Uninstalling can disconnect every account connected through it, and plugins your workspace installs may not offer the option.
- 2In Codex
Run /plugins in the Codex CLI, select the plugin and uninstall it, or press Space to turn it off.