get_diagram_url
AI agents call get_diagram_url to retrieve information from PlantUML MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves a URL for a diagram resource. This is a read operation with no side effects—it does not create, modify, delete, or execute external code. The empty description lowers confidence slightly, but the naming convention and server context strongly suggest this is a retrieval operation. Blast radius is minimal: misuse would at worst expose a URL.
From the tool's definition Tool name 'get_diagram_url' and sibling tools 'render_and_save_diagram', 'render_ascii_art' indicate this retrieves a URL for an already-generated diagram.
Attacks that exploit this kind of access
get_diagram_url. It is categorised as a Read tool in the PlantUML MCP Server MCP Server, which means it retrieves data without modifying state.
Register the PlantUML MCP Server MCP server in PolicyLayer and add a rule for get_diagram_url: 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 PlantUML MCP Server. Nothing to install.
get_diagram_url 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 get_diagram_url 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 get_diagram_url. 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.
get_diagram_url is provided by the PlantUML MCP Server MCP server (ka1lak/prompt2diagram-mcp). 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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