validate_script · RunWhen Platform MCP: Risk & Policy

WHAT IT DOES

What validate_script does on RunWhen Platform MCP

AI agents invoke validate_script to trigger actions in RunWhen Platform MCP. 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 validate_script needs a policy

The tool name suggests it validates a script, which likely involves executing or parsing code to check for correctness. Script validation often involves running the script in a sandbox or interpreter. The description is empty, which lowers confidence. Given the context of RunWhen Platform (which deals with automation and runbooks), script validation likely involves some form of execution.

From the tool's definition Tool name contains 'validate_script' — 'script' implies code execution is involved in the validation process

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

validate_script Rate-limited

validate_script 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": {
    "validate_script": {
      "limits": [
        {
          "counter": "validate_script_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 RunWhen Platform MCP, so you can run agents against it safely.

FAQ

Questions about validate_script

What does the validate_script tool do? +

validate_script. It is categorised as a Execute tool in the RunWhen Platform MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on validate_script? +

Register the RunWhen Platform MCP server in PolicyLayer and add a rule for validate_script: 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 RunWhen Platform MCP. Nothing to install.

What risk level is validate_script? +

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

Can I rate-limit validate_script? +

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

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

validate_script is provided by the RunWhen Platform MCP server (runwhen-contrib/runwhen-platform-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.