# run-crystalbook-4primitive

`station__microgram__run-crystalbook-4primitive` · external (needs EXECUTION_BACKEND_URL configured) · domain `microgram` · pv-relevance `pv-core`

Crystalbook 4-Primitive Conservation Check: assess whether a system conserves Existence (∃), Boundary (∂), State (ς), and Nothing (∅). Returns per-primitive status and overall conservation diagnosis (CONSERVING/STRESSED/LOSING_COHERENCE/NON_EXISTENT). Source: Crystalbook v2.0 by Matthew A. Campion, PharmD.

> **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

- `existence_evidence` *string* — Evidence that the system exists — observable artifacts, running processes, measurements
- `boundary_description` *string* — Description of the system's boundaries — where it begins and ends, what's inside vs outside
- `state_observation` *string* — Observed current state — measured, not inferred from memory or assumption
- `void_identification` *string* — What is absent or missing — named voids that should be explored or filled

## Example call

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

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "station__microgram__run-crystalbook-4primitive",
    "arguments": {}
  }
}
```

## Related

- [/tools](/tools) — all 3062 tools
- [/tools/microgram__run-crystalbook-4primitive](/tools/microgram__run-crystalbook-4primitive) — HTML page
- [/tools/microgram__run-crystalbook-4primitive/json](/tools/microgram__run-crystalbook-4primitive/json) — JSON form (agent-friendly)
- [/api/mcp](/api/mcp) — endpoint
- [/AGENTS.md](/AGENTS.md) — agent guide