# highway-legitimate-field

`station__highway__highway-legitimate-field` · external (needs EXECUTION_BACKEND_URL configured) · domain `highway` · pv-relevance `non-pv`

Check if a tool is being used in its legitimate transportation field.

> **Note:** This tool routes through an external execution backend. If `EXECUTION_BACKEND_URL` is unset on the server, calls return JSON-RPC error `-32603 "Tool execution backend not configured"`. Tools with `backend: native` execute in-process and are always callable.

## Agent metadata

- `idempotent`: unknown
- `read_only`: unknown
- `expected_latency_ms`: unknown (not yet contract-tested)
- `cost_tokens_estimate`: unknown

## Input schema

- `highway_class` *integer* (required) — Current highway class of the tool (1-4)
- `tool_name` *string* (required) — Tool name
- `use_case` *string* (required) — What the tool is being used for

## Example call

```json
POST /api/mcp
Content-Type: application/json

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "station__highway__highway-legitimate-field",
    "arguments": {
      "highway_class": 0,
      "tool_name": "",
      "use_case": ""
    }
  }
}
```

## Related

- [/tools](/tools) — all 3062 tools
- [/tools/highway__highway-legitimate-field](/tools/highway__highway-legitimate-field) — HTML page
- [/tools/highway__highway-legitimate-field/json](/tools/highway__highway-legitimate-field/json) — JSON form (agent-friendly)
- [/api/mcp](/api/mcp) — endpoint
- [/AGENTS.md](/AGENTS.md) — agent guide