AI agents call kernel_projection to retrieve information from Cellrank without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool generates a visual plot of an existing transition matrix. This is a read/query operation with no side effects on data. Misuse potential is minimal as it only produces visualizations.
From the tool's definition 'Plot transition matrix as a stream or grid plot' — this is a visualization/read operation that retrieves and displays existing data without modifying it.
Attacks that exploit this kind of access
Plot transition matrix as a stream or grid plot for a specified kernel. It is categorised as a Read tool in the Cellrank MCP Server, which means it retrieves data without modifying state.
Register the Cellrank MCP server in PolicyLayer and add a rule for kernel_projection: 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 Cellrank. Nothing to install.
kernel_projection 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 kernel_projection 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 kernel_projection. 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.
kernel_projection is provided by the Cellrank MCP server (scmcphub/cellrank-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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