# circle-closure

`station__circles__circle-closure` · external (needs EXECUTION_BACKEND_URL configured) · domain `circles` · pv-relevance `non-pv`

Closure evaluator — gate through fatal SMM phases (IV-VIII), credibility ≥0.80, Phase X divergence ≥2. Returns OPEN | CLOSABLE | SUSPENDED.

> **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

- `phase_iv_present` *boolean* (required)
- `phase_v_present` *boolean* (required)
- `phase_vi_present` *boolean* (required)
- `phase_vii_present` *boolean* (required)
- `phase_viii_present` *boolean* (required)
- `credibility_score` *number* (required)
- `derived_question_count` *integer* (required)

## Example call

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

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "station__circles__circle-closure",
    "arguments": {
      "phase_iv_present": false,
      "phase_v_present": false,
      "phase_vi_present": false,
      "phase_vii_present": false,
      "phase_viii_present": false,
      "credibility_score": 0,
      "derived_question_count": 0
    }
  }
}
```

## Related

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