Validate Mermaid diagram syntax
AI agents call validate_mermaid to retrieve information from ContextForge MCP Gateway without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
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
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.
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.
validate_mermaid is a Read tool with low risk. Read-only tools are generally safe to allow by default.
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.
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.
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.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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