AI agents call circle_plot to retrieve information from Liana-MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool generates a visualization from existing cell-cell communication analysis results. Visualization is a read-only operation with no side effects on the underlying data. The tool retrieves analyzed data and renders it graphically, which is characteristic of Read category tools.
From the tool's definition Tool name 'circle_plot' and description state it 'Visualize cell-cell communication network using a circular plot' — a visualization operation that retrieves and displays data without modifying or deleting it.
Attacks that exploit this kind of access
Visualize cell-cell communication network using a circular plot. It is categorised as a Read tool in the Liana-MCP MCP Server, which means it retrieves data without modifying state.
Register the Liana- MCP server in PolicyLayer and add a rule for circle_plot: 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 Liana-MCP. Nothing to install.
circle_plot 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 circle_plot 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 circle_plot. 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.
circle_plot is provided by the Liana- MCP server (scmcphub/liana-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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