# run-vehicle-health-cascade

`station__microgram__run-vehicle-health-cascade` · external (needs EXECUTION_BACKEND_URL configured) · domain `microgram` · pv-relevance `pv-core`

Run the engine health cascade: primitive failure classifier → organ signal adapter. Takes a chain boundary error and returns which engine primitive failed (Seal/Convert/Time/Lubricate/Transfer) plus the organ health status (healthy/minor_stress/impaired/critical).

> **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

- `error_type` *string* (required) — Error type: ingress, egress, execution, sequencing, missing_adapter
- `error_message` *string* (required) — The boundary error message from chain_validated
- `step_index` *integer* — Which chain step produced the error
- `ratio` *number* (required) — Violation ratio (violations/fleet_size)

## Example call

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

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "station__microgram__run-vehicle-health-cascade",
    "arguments": {
      "error_type": "",
      "error_message": "",
      "ratio": 0
    }
  }
}
```

## Related

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