Generate structured prompts for automated diagram format selection based on user requirements
AI agents call help_choose_diagram to retrieve information from Diagram Bridge MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool generates structured prompts and recommendations for diagram format selection. It reads user requirements and outputs informational guidance—no data is created, modified, deleted, executed, or committed. The output is purely advisory/instructional content to help downstream decision-making. This is a Read category action.
From the tool's definition Tool name 'help_choose_diagram' and description 'Generate structured prompts for automated diagram format selection' indicate the tool retrieves or generates guidance/information without modifying any data or executing external operations.
Documented attack patterns abuse exactly the kind of access help_choose_diagram gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Diagram Bridge MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for help_choose_diagram:
{
"version": "1",
"default": "deny",
"tools": {
"help_choose_diagram": {}
}
}help_choose_diagram is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Generate structured prompts for automated diagram format selection based on user requirements. It is categorised as a Read tool in the Diagram Bridge MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Diagram Bridge MCP Server MCP server in PolicyLayer and add a rule for help_choose_diagram: 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 Diagram Bridge MCP Server. Nothing to install.
help_choose_diagram 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 help_choose_diagram 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 help_choose_diagram. 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.
help_choose_diagram is provided by the Diagram Bridge MCP Server MCP server (tohachan/diagram-bridge-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Diagram Bridge MCP Server, 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.
3 Diagram Bridge MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.