# probability_calculator

A read tool on the Math MCP Server MCP server.

Agent View of the PolicyLayer registry record for `probability_calculator`. HTML page: https://policylayer.com/tools/111-test-111-math-mcp-server/probability-calculator

## Facts

- Tool: `probability_calculator`
- Server: Math MCP Server (`111-test-111/math-mcp-server`) — https://policylayer.com/tools/111-test-111-math-mcp-server.md
- Homepage: https://github.com/111-test-111/math-mcp-server
- Risk category: Read (Low risk)
- Registry record: grade C, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Allowed

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "probability_calculator",
    "arguments": {}
  }
}
```

## Why probability_calculator is rated Low

A probability calculator in a math MCP server computes probabilities from input parameters—a read-only operation that retrieves or derives mathematical results. The presence of related tools like 'expression_evaluator' and 'calculus_engine' reinforces this as a computational utility. No evidence suggests destructive, financial, or code-execution capabilities.

From the tool's own definition: "Tool name 'probability_calculator' and sibling context (math computation tools) indicate this performs calculations and queries on probability data without modifying external state. Description is empty, limiting precision."

## Use case

AI agents call probability_calculator to retrieve information from Math MCP Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

## Recommended policy (PolicyLayer)

Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Math MCP Server:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "probability_calculator": {}
  }
}
```

## Other tools on Math MCP Server (21)

- `cleanup_resources` — Destructive — https://policylayer.com/tools/111-test-111-math-mcp-server/cleanup-resources.md
- `basic_arithmetic` — Execute — https://policylayer.com/tools/111-test-111-math-mcp-server/basic-arithmetic.md
- `calculus_engine` — Execute — https://policylayer.com/tools/111-test-111-math-mcp-server/calculus-engine.md
- `expression_evaluator` — Execute — https://policylayer.com/tools/111-test-111-math-mcp-server/expression-evaluator.md
- `matrix_calculator` — Execute — https://policylayer.com/tools/111-test-111-math-mcp-server/matrix-calculator.md
- `number_theory_calculator` — Execute — https://policylayer.com/tools/111-test-111-math-mcp-server/number-theory-calculator.md
- `optimization_suite` — Execute — https://policylayer.com/tools/111-test-111-math-mcp-server/optimization-suite.md
- `regression_modeler` — Execute — https://policylayer.com/tools/111-test-111-math-mcp-server/regression-modeler.md
- `financial_calculator` — Financial — https://policylayer.com/tools/111-test-111-math-mcp-server/financial-calculator.md
- `complex_analysis_suite` — Other — https://policylayer.com/tools/111-test-111-math-mcp-server/complex-analysis-suite.md
- `geometry_calculator` — Other — https://policylayer.com/tools/111-test-111-math-mcp-server/geometry-calculator.md
- `graph_theory_suite` — Other — https://policylayer.com/tools/111-test-111-math-mcp-server/graph-theory-suite.md
- `mathematical_functions` — Other — https://policylayer.com/tools/111-test-111-math-mcp-server/mathematical-functions.md
- `precision_calculator` — Other — https://policylayer.com/tools/111-test-111-math-mcp-server/precision-calculator.md
- `signal_processing_calculator` — Other — https://policylayer.com/tools/111-test-111-math-mcp-server/signal-processing-calculator.md
- `number_converter` — Read — https://policylayer.com/tools/111-test-111-math-mcp-server/number-converter.md
- `number_properties` — Read — https://policylayer.com/tools/111-test-111-math-mcp-server/number-properties.md
- `statistics_analyzer` — Read — https://policylayer.com/tools/111-test-111-math-mcp-server/statistics-analyzer.md
- `unit_converter` — Read — https://policylayer.com/tools/111-test-111-math-mcp-server/unit-converter.md
- `create_and_save_chart` — Write — https://policylayer.com/tools/111-test-111-math-mcp-server/create-and-save-chart.md
- `plot_function_curve` — Write — https://policylayer.com/tools/111-test-111-math-mcp-server/plot-function-curve.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=111-test-111-math-mcp-server · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/111-test-111-math-mcp-server