# Microgram: signal-trend-detector

`station__algovigilance__microgram-signal-trend-detector` · native (always callable) · domain `algovigilance` · pv-relevance `pv-core`

Detects signal trend direction from pre-computed change percentage. Caller computes pct_change = (current - previous) / previous * 100. Chains into signal-priority.

## Agent metadata

- `idempotent`: true
- `read_only`: true
- `expected_latency_ms`: unknown (not yet contract-tested)
- `cost_tokens_estimate`: unknown

## Input schema

- `prr_current` *number* (required) — Input variable prr_current
- `pct_change` *number* — Input variable pct_change

## Example call

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

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "station__algovigilance__microgram-signal-trend-detector",
    "arguments": {
      "prr_current": 0
    }
  }
}
```

## Related

- [/tools](/tools) — all 7718 tools
- [/tools/algovigilance__microgram-signal-trend-detector](/tools/algovigilance__microgram-signal-trend-detector) — HTML page
- [/tools/algovigilance__microgram-signal-trend-detector/json](/tools/algovigilance__microgram-signal-trend-detector/json) — JSON form (agent-friendly)
- [/api/mcp](/api/mcp) — endpoint
- [/AGENTS.md](/AGENTS.md) — agent guide