# run-conservation-checker

`station__microgram__run-conservation-checker` · external (needs EXECUTION_BACKEND_URL configured) · domain `microgram` · pv-relevance `pv-core`

Validates primitive compositions against the conservation law ∃ = ∂(×(ς, ∅)). Routes compositions through existence, boundary, state, and void checks. Exercises the × (Product) axiomatic operator.

> **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

- `has_boundary` *boolean* (required) — Input parameter: has_boundary
- `composition_tier` *string* (required) — Input parameter: composition_tier
- `has_state` *boolean* (required) — Input parameter: has_state
- `primitive_count` *integer* (required) — Input parameter: primitive_count
- `has_void` *boolean* (required) — Input parameter: has_void
- `has_existence` *boolean* (required) — Input parameter: has_existence

## Example call

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

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "station__microgram__run-conservation-checker",
    "arguments": {
      "has_boundary": false,
      "composition_tier": "",
      "has_state": false,
      "primitive_count": 0,
      "has_void": false,
      "has_existence": false
    }
  }
}
```

## Related

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