# detect-stance-phase

`station__suit-sensors__detect-stance-phase` · external (needs EXECUTION_BACKEND_URL configured) · domain `suit-sensors` · pv-relevance `non-pv`

Detect whether a foot is in stance phase (on ground) by comparing vertical ground reaction force against a threshold

> **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

- `vertical_force_n` *number* (required) — Vertical ground reaction force (N)
- `threshold_n` *number* — Force threshold for stance detection (N)

## Example call

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

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "station__suit-sensors__detect-stance-phase",
    "arguments": {
      "vertical_force_n": 0
    }
  }
}
```

## Related

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