# run-ich-q1b-photostability

`station__microgram__run-ich-q1b-photostability` · external (needs EXECUTION_BACKEND_URL configured) · domain `microgram` · pv-relevance `pv-core`

ICH Q1B Photostability Testing decision tree. Encodes the Decision Flow Chart: directly exposed → immediate pack → marketing pack → redesign. For drug substances, routes forced degradation/confirmatory results.

> **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

- `product_type` *string* (required) — drug_substance or drug_product
- `confirmatory_result` *string* — DS only: photostable, photolabile, or equivocal
- `immediate_pack_impenetrable` *boolean* — DP only: true if pack is light-impenetrable (aluminum tubes, cans)
- `directly_exposed_acceptable` *boolean* — DP: whether change is acceptable when directly exposed
- `immediate_pack_acceptable` *boolean* — DP: whether change is acceptable in immediate pack
- `marketing_pack_acceptable` *boolean* — DP: whether change is acceptable in marketing pack

## Example call

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

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "station__microgram__run-ich-q1b-photostability",
    "arguments": {
      "product_type": ""
    }
  }
}
```

## Related

- [/tools](/tools) — all 3062 tools
- [/tools/microgram__run-ich-q1b-photostability](/tools/microgram__run-ich-q1b-photostability) — HTML page
- [/tools/microgram__run-ich-q1b-photostability/json](/tools/microgram__run-ich-q1b-photostability/json) — JSON form (agent-friendly)
- [/api/mcp](/api/mcp) — endpoint
- [/AGENTS.md](/AGENTS.md) — agent guide