# chemistry-threshold-rate

`station__chemistry__chemistry-threshold-rate` · external (needs EXECUTION_BACKEND_URL configured) · domain `chemistry` · pv-relevance `pv-adjacent`

Calculate Arrhenius rate (threshold gating). PV confidence: 0.92

> **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

- `activation_energy_kj` *number* (required) — Activation energy in kJ/mol (threshold)
- `pre_exponential` *number* (required) — Pre-exponential factor A (sensitivity)
- `temperature_k` *number* (required) — Temperature in Kelvin (scaling factor)

## Example call

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

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "station__chemistry__chemistry-threshold-rate",
    "arguments": {
      "activation_energy_kj": 0,
      "pre_exponential": 0,
      "temperature_k": 0
    }
  }
}
```

## Related

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