# check-stability-shell

`station__tov__check-stability-shell` · external (needs EXECUTION_BACKEND_URL configured) · domain `tov` · pv-relevance `pv-core`

Check if a system's complexity count is at a stability point (magic number: 2, 8, 20, 28, 50, 82, 126, 184, 258, 350). Returns distance to nearest stable configuration.

> **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

- `complexity` *integer* (required) — System complexity count (e.g., number of modules, tools, or components)

## Example call

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

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "station__tov__check-stability-shell",
    "arguments": {
      "complexity": 0
    }
  }
}
```

## Related

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