A tool to calculate a specific percentile of a collection
AI agents call percentile_calculator to retrieve information from JeffersonStats without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Percentile calculation is a read-only statistical analysis operation. It queries data to produce a result but has no side effects, cannot modify data, and does not execute external operations or delete anything. It fits the Read category pattern alongside other sibling tools like descriptive_statistics_summary and correlation_calculator that perform non-destructive analytical operations.
From the tool's definition Tool performs 'calculate a specific percentile' on a collection. This is a pure mathematical computation that retrieves a derived statistic from input data without modifying, deleting, or executing side effects.
Attacks that exploit this kind of access
A tool to calculate a specific percentile of a collection. It is categorised as a Read tool in the JeffersonStats MCP Server, which means it retrieves data without modifying state.
Register the JeffersonStats MCP server in PolicyLayer and add a rule for percentile_calculator: 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 JeffersonStats. Nothing to install.
percentile_calculator 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 percentile_calculator 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 percentile_calculator. 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.
percentile_calculator is provided by the JeffersonStats MCP server (sharabhshukla/jeffersonstatsmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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