# diagnose

`station__crystalbook__diagnose` · external (needs EXECUTION_BACKEND_URL configured) · domain `crystalbook` · pv-relevance `non-pv`

Run the Crystalbook diagnostic against a described system. Checks the four-primitive existence equation (∃, ∂, ς, ∅) and all eight Laws, returning per-law status (SATISFIED/AT_RISK/VIOLATED), a conservation status, and prescriptions for any deviations found.

> **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

- `system` *string* (required) — Description of the system, project, team, or decision to diagnose. Be specific about what exists, what its boundaries are, what state it is in, and what is missing.
- `observations` *string* — Specific observations, measurements, or evidence about the system's current state. Include any known deviations, concerns, or symptoms.

## Example call

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

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "station__crystalbook__diagnose",
    "arguments": {
      "system": ""
    }
  }
}
```

## Related

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