validate_mermaid

Validate Mermaid diagram syntax

SERVERContextForge MCP Gateway SOURCEjrmatherly/mcp-context-forge

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/jrmatherly-mcp-context-forge/validate-mermaid.md

WHAT IT DOES

What validate_mermaid does on ContextForge MCP Gateway

AI agents call validate_mermaid to retrieve information from ContextForge MCP Gateway 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_mermaid is rated Low

Validation is a read-only operation that analyzes input (Mermaid diagram syntax) and returns pass/fail results without side effects. It does not create, modify, delete data, execute code, or commit financial obligations. The tool inspects and reports on diagram syntax conformance, which is characteristic of Read category tools.

From the tool's definition Tool name 'validate_mermaid' and description 'Validate Mermaid diagram syntax' indicate a syntax validation operation that parses and checks diagram text without modifying any state or triggering external operations.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs validate_mermaid safely

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

validate_mermaid Allowed

validate_mermaid 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_mermaid": {}
  }
}

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

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

FAQ

Questions about validate_mermaid

What does the validate_mermaid tool do? +

Validate Mermaid diagram syntax. It is categorised as a Read tool in the ContextForge MCP Gateway MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on validate_mermaid? +

Register the ContextForge MCP Gateway MCP server in PolicyLayer and add a rule for validate_mermaid: 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 ContextForge MCP Gateway. Nothing to install.

What risk level is validate_mermaid? +

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

Can I rate-limit validate_mermaid? +

Yes. Add a rate_limit block to the validate_mermaid 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_mermaid completely? +

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

validate_mermaid is provided by the ContextForge MCP Gateway MCP server (jrmatherly/mcp-context-forge). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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