# run-session-velocity

`station__microgram__run-session-velocity` · external (needs EXECUTION_BACKEND_URL configured) · domain `microgram` · pv-relevance `pv-core`

Session productivity velocity classifier. Bands: EXCEPTIONAL (mcp_ratio>=0.3 AND density>=0.5), TARGET (mcp_ratio>=0.15 AND density>=0.25), ACCEPTABLE (mcp_ratio>=0.05 OR density>=0.1), SLOW (else). Inputs are pre-computed ratios. chains_to: momentum-tracker.

> **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

- `density` *number* (required) — Input parameter: density
- `mcp_ratio` *number* (required) — Input parameter: mcp_ratio

## Example call

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

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "station__microgram__run-session-velocity",
    "arguments": {
      "density": 0,
      "mcp_ratio": 0
    }
  }
}
```

## Related

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