List all detected diagram blocks without rendering them.
AI agents call list_diagrams to retrieve information from Vizdown-MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only queries and retrieves information about diagram blocks from Markdown files. It performs no modifications, executions, or destructive operations. The read-only nature and informational purpose place it squarely in the Read category with low severity, as misuse poses minimal risk—an AI agent could at worst retrieve metadata about diagrams that exist in accessible files.
From the tool's definition Tool description states 'List all detected diagram blocks without rendering them.' The verb 'list' and the absence of any modification, execution, or deletion confirms this is a retrieval operation with no side effects.
Attacks that exploit this kind of access
List all detected diagram blocks without rendering them. It is categorised as a Read tool in the Vizdown-MCP MCP Server, which means it retrieves data without modifying state.
Register the Vizdown- MCP server in PolicyLayer and add a rule for list_diagrams: 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 Vizdown-MCP. Nothing to install.
list_diagrams 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 list_diagrams 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 list_diagrams. 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.
list_diagrams is provided by the Vizdown- MCP server (rutika196/clarity-beta). 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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