# verdict-from-chain

`station__vigilance__verdict-from-chain` · external (needs EXECUTION_BACKEND_URL configured) · domain `vigilance` · pv-relevance `pv-core`

Parse a raw RSK chain output into a typed Verdict struct — the driveshaft between RSK engine (Excrete) and Guardian navigator (Absorb). Takes drug name, event name, and the chain_output JSON object from pv-signal-to-action or vehicle-full-cascade. Returns a typed Verdict with signal_strength, causality, regulatory_action, deadline_days, correction_factor, reporting_fraction, source_type, and timestamp — ready for Guardian consumption.

> **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

- `drug` *string* (required) — Drug name (e.g., metformin)
- `event` *string* (required) — Adverse event name (e.g., lactic acidosis)
- `chain_output` *object* (required) — The final_output JSON object from a completed chain run (pv-signal-to-action or vehicle-full-cascade)

## Example call

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

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "station__vigilance__verdict-from-chain",
    "arguments": {
      "drug": "",
      "event": "",
      "chain_output": {}
    }
  }
}
```

## Related

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