calculate_pca · Gwas MCP: Risk & Policy

WHAT IT DOES

What calculate_pca does on Gwas

AI agents invoke calculate_pca to trigger actions in Gwas. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why calculate_pca needs a policy

PCA for population stratification involves running an external computation engine (PLINK) on input files to produce statistical outputs. This is an Execute-category action because it runs a data analysis process with effects dependent on the input arguments. No data is deleted or financial transactions occur, but misuse could consume significant compute resources or produce misleading scientific outputs.

From the tool's definition 'Perform Principal Component Analysis' and 'Uses PLINK files as input' — this triggers a computational analysis pipeline (PCA) on genomic data files, executing an external bioinformatics tool (PLINK).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

calculate_pca Rate-limited

calculate_pca stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "calculate_pca": {
      "limits": [
        {
          "counter": "calculate_pca_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Gwas, so you can run agents against it safely.

FAQ

Questions about calculate_pca

What does the calculate_pca tool do? +

Perform Principal Component Analysis for population stratification. Uses PLINK files as input. It is categorised as a Execute tool in the Gwas MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on calculate_pca? +

Register the Gwas MCP server in PolicyLayer and add a rule for calculate_pca: 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 Gwas. Nothing to install.

What risk level is calculate_pca? +

calculate_pca is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit calculate_pca? +

Yes. Add a rate_limit block to the calculate_pca 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.

How do I block calculate_pca completely? +

Set action: deny in the PolicyLayer policy for calculate_pca. 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.

What MCP server provides calculate_pca? +

calculate_pca is provided by the Gwas MCP server (muslus/gwas-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.