# screen

`station__td-screen__screen` · external (needs EXECUTION_BACKEND_URL configured) · domain `td-screen` · pv-relevance `non-pv`

Pre-screen a patient for tardive dyskinesia risk. Returns irreversibility score (0-1), risk category, recovery capacity, and clinical recommendation based on drug class, exposure duration, age, dose, and prior episodes.

> **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

- `duration_months` *number* (required) — Duration of antipsychotic/dopaminergic exposure in months
- `drug_class` *string* (required) — Drug class: typical_high_potency, typical_low_potency, atypical, dopaminergic, antiemetic, other
- `age` *number* (required) — Patient age in years
- `dose_ratio` *number* — Dose relative to standard (1.0 = standard dose, 2.0 = double)
- `prior_episodes` *number* — Number of prior reversible dyskinesia episodes

## Example call

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

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "station__td-screen__screen",
    "arguments": {
      "duration_months": 0,
      "drug_class": "",
      "age": 0
    }
  }
}
```

## Related

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