marketplace_diagnostics · Kiln MCP: Risk & Policy

WHAT IT DOES

What marketplace_diagnostics does on Kiln

AI agents invoke marketplace_diagnostics to trigger actions in Kiln. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why marketplace_diagnostics needs a policy

This tool executes diagnostic operations (connectivity checks) against external services. While not destructive or financial, it performs active system operations that could have side effects depending on how the checks are implemented—network requests, service probing, or state queries.

From the tool's definition Tool name 'marketplace_diagnostics' with description 'Run connectivity checks against all configured marketplaces' indicates execution of diagnostic operations against external systems.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

marketplace_diagnostics Rate-limited

marketplace_diagnostics stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "marketplace_diagnostics": {
      "limits": [
        {
          "counter": "marketplace_diagnostics_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Kiln, so you can run agents against it safely.

FAQ

Questions about marketplace_diagnostics

What does the marketplace_diagnostics tool do? +

Run connectivity checks against all configured marketplaces. It is categorised as a Execute tool in the Kiln MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on marketplace_diagnostics? +

Register the Kiln MCP server in PolicyLayer and add a rule for marketplace_diagnostics: 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 Kiln. Nothing to install.

What risk level is marketplace_diagnostics? +

marketplace_diagnostics is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit marketplace_diagnostics? +

Yes. Add a rate_limit block to the marketplace_diagnostics 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 marketplace_diagnostics completely? +

Set action: deny in the PolicyLayer policy for marketplace_diagnostics. 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 marketplace_diagnostics? +

marketplace_diagnostics is provided by the Kiln MCP server (codeofaxel/Kiln). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.