Returns a comprehensive design guide for creating beautiful Excalidraw diagrams: color palette, sizing rules, layout patterns, arrow binding best practices, diagram templates, and anti-patterns. Call this before creating diagrams to produce professional results.
AI agents call read_diagram_guide to retrieve information from Excalidraw MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves static reference information (design guidelines, color palettes, layout patterns) to assist users in creating better diagrams. It has no capability to modify data, execute code, delete content, or trigger external operations. It is purely a query/retrieval operation with zero side effects, fitting squarely into the Read category with low severity.
From the tool's definition Tool name 'read_diagram_guide' and description 'Returns a comprehensive design guide' indicate data retrieval with no side effects. The guide is informational content used to inform diagram creation but does not itself modify, execute, or delete anything.
Attacks that exploit this kind of access
Returns a comprehensive design guide for creating beautiful Excalidraw diagrams: color palette, sizing rules, layout patterns, arrow binding best practices, diagram templates, and anti-patterns. Call this before creating diagrams to produce professional results. It is categorised as a Read tool in the Excalidraw MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Excalidraw MCP Server MCP server in PolicyLayer and add a rule for read_diagram_guide: 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 Excalidraw MCP Server. Nothing to install.
read_diagram_guide 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 read_diagram_guide 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 read_diagram_guide. 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.
read_diagram_guide is provided by the Excalidraw MCP Server MCP server (kakacoding1/mcp_excalidraw). 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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