# run-rrm-capacity-calculator

`station__microgram__run-rrm-capacity-calculator` · external (needs EXECUTION_BACKEND_URL configured) · domain `microgram` · pv-relevance `pv-core`

Railway Reference Model capacity calculator. Computes system throughput from headway components using the railway capacity formula: capacity = 3600 / headway_seconds. Headway decomposes into braking distance, sighting distance, safety margin, and block length. Maps to PV throughput: cases processed per hour given review constraints.

> **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

- `etcs_level` *integer* (required) — Input parameter: etcs_level
- `sighting_distance_seconds` *number* (required) — Input parameter: sighting_distance_seconds
- `safety_margin_seconds` *number* (required) — Input parameter: safety_margin_seconds
- `headway_seconds` *number* (required) — Input parameter: headway_seconds
- `monitoring_level` *integer* (required) — Input parameter: monitoring_level
- `braking_distance_seconds` *number* (required) — Input parameter: braking_distance_seconds
- `block_length_seconds` *number* (required) — Input parameter: block_length_seconds

## Example call

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

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "station__microgram__run-rrm-capacity-calculator",
    "arguments": {
      "etcs_level": 0,
      "sighting_distance_seconds": 0,
      "safety_margin_seconds": 0,
      "headway_seconds": 0,
      "monitoring_level": 0,
      "braking_distance_seconds": 0,
      "block_length_seconds": 0
    }
  }
}
```

## Related

- [/tools](/tools) — all 3062 tools
- [/tools/microgram__run-rrm-capacity-calculator](/tools/microgram__run-rrm-capacity-calculator) — HTML page
- [/tools/microgram__run-rrm-capacity-calculator/json](/tools/microgram__run-rrm-capacity-calculator/json) — JSON form (agent-friendly)
- [/api/mcp](/api/mcp) — endpoint
- [/AGENTS.md](/AGENTS.md) — agent guide