validate

Validate tool parameters before scheduling (dry-run). REFERENCE IMPLEMENTATION for MCP validation protocol.

SERVERNcp SOURCE@portel/ncp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-portel-dev-ncp/validate.md

WHAT IT DOES

What validate does on Ncp

AI agents call validate to retrieve information from Ncp without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why validate is rated Low

This tool performs validation and parameter checking without side effects. It operates in a dry-run mode, meaning it tests/inspects parameters and configurations before actual execution, making it a read-only analysis tool. It retrieves or analyzes information about tool parameters without creating, modifying, deleting, or executing actual operations.

From the tool's definition The tool description states 'Validate tool parameters before scheduling (dry-run)' and 'REFERENCE IMPLEMENTATION for MCP validation protocol.' A dry-run validation operation performs checks and analysis without executing or modifying any data.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs validate safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Ncp, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For validate, this is the rule to start with:

validate Allowed

validate is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

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

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Ncp, apply this rule, and every validate call is checked against it from then on.

FAQ

Questions about validate

What does the validate tool do? +

Validate tool parameters before scheduling (dry-run). REFERENCE IMPLEMENTATION for MCP validation protocol. It is categorised as a Read tool in the Ncp MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on validate? +

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

What risk level is validate? +

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

Can I rate-limit validate? +

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

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

validate is provided by the Ncp MCP server (@portel/ncp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on Ncp, and thousands of servers like it.

This server

All 275 Ncp tools →

Across the catalogue

The MCP Attack Database →

Guides

Roll out MCP under one policy →Data exfiltration →MCP token cost →