checkup_scan_json

THE RISK

Low Risk

Why checkup_scan_json needs a policy

This tool performs a diagnostic scan of a Next.js project and returns findings in JSON format. Scanning is a read-only operation that retrieves information about the project state without modifying code, configuration, or infrastructure. The blast radius of misuse is minimal—an agent could only gain unwanted visibility into project details, but cannot create jobs, modify configuration, or execute actions.

From the tool's definition Tool name and description indicate 'Scan' and 'return structured JSON results' with no modification capability mentioned. The phrase 'programmatically process findings' implies data retrieval only.

Documented attack patterns abuse exactly the kind of access checkup_scan_json gives an agent:

POLICY

How to control checkup_scan_json

PolicyLayer is an MCP gateway — it sits between your AI agents and Clocktower, and nothing reaches the server without passing your rules. This is the rule we recommend for checkup_scan_json:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "checkup_scan_json": {}
  }
}

checkup_scan_json is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Clocktower — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about checkup_scan_json

What does the checkup_scan_json tool do? +

Scan a Next.js project and return structured JSON results. Use this when you need to programmatically process findings. It is categorised as a Read tool in the Clocktower MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on checkup_scan_json? +

Register the Clocktower MCP server in PolicyLayer and add a rule for checkup_scan_json: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Clocktower. Nothing to install.

What risk level is checkup_scan_json? +

checkup_scan_json is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit checkup_scan_json? +

Yes. Add a rate_limit block to the checkup_scan_json rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block checkup_scan_json completely? +

Set action: deny in the PolicyLayer policy for checkup_scan_json. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides checkup_scan_json? +

checkup_scan_json is provided by the Clocktower MCP server (sathergate/sathergate-toolkit). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Clocktower tool call.

Start from Clocktower, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →