# run-rrm-sil-assigner

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

Railway Reference Model SIL assigner. Given an RRM layer number (1-6), assigns the Safety Integrity Level range per EN 50129 framework. Layer 4 (Signaling) carries SIL 4 — information processing errors have the most direct path to catastrophe. Maps to PV test coverage and validation requirements.

> **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

- `failure_consequence` *string* (required) — Input parameter: failure_consequence
- `layer_number` *integer* (required) — Input parameter: layer_number
- `has_safety_critical_function` *boolean* (required) — Input parameter: has_safety_critical_function

## Example call

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

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "station__microgram__run-rrm-sil-assigner",
    "arguments": {
      "failure_consequence": "",
      "layer_number": 0,
      "has_safety_critical_function": false
    }
  }
}
```

## Related

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