Analyze diagram code and return metadata (type, complexity, node/edge count, estimated render time).
AI agents call getDiagramInfo to retrieve information from Mcp Mermiad without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
getDiagramInfo retrieves and queries information about a diagram without modifying data, executing code, or performing destructive operations. It is a passive analysis function that returns computed metadata about diagram structure and properties. This is a classic Read operation with minimal risk even if misused.
From the tool's definition Tool analyzes existing diagram code and returns metadata (type, complexity, node/edge count, estimated render time) - purely informational with no modification or execution of side effects.
Documented attack patterns abuse exactly the kind of access getDiagramInfo gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Mermiad, and nothing reaches the server without passing your rules. This is the rule we recommend for getDiagramInfo:
{
"version": "1",
"default": "deny",
"tools": {
"getDiagramInfo": {}
}
}getDiagramInfo is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Analyze diagram code and return metadata (type, complexity, node/edge count, estimated render time). It is categorised as a Read tool in the Mcp Mermiad MCP Server, which means it retrieves data without modifying state.
Register the Mcp Mermiad MCP server in PolicyLayer and add a rule for getDiagramInfo: 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 Mcp Mermiad. Nothing to install.
getDiagramInfo 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 getDiagramInfo 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 getDiagramInfo. 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.
getDiagramInfo is provided by the Mcp Mermiad MCP server (narasimhaponnada/mermaid-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mcp Mermiad, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
9 Mcp Mermiad tools catalogued and risk-classified — across an index of 43,000+ MCP servers.