# science.chem.formula

Get molecular formula and molecular weight for any compound by name, CAS number, or SMILES. Returns formula (e.g. "C9H8O4" for aspirin) and weight in daltons (e.g. 180.157). Accepts any chemical identifier format (NCI CACTUS)

Agent View of the PolicyLayer registry record for `science.chem.formula`. HTML page: https://policylayer.com/tools/io-github-whiteknightonhorse-apibase/science.chem.formula

## Facts

- Tool: `science.chem.formula`
- Server: Apibase (`apibase-mcp-client`) — https://policylayer.com/tools/io-github-whiteknightonhorse-apibase.md
- Install: `npx -y apibase-mcp-client`
- Homepage: https://github.com/whiteknightonhorse/APIbase
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server auth posture: open
- Server rate-limited: no
- Parameters: 1 (1 required)
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `identifier` | string | yes | Chemical identifier — compound name (e.g. "ibuprofen"), CAS number (e.g. "15687-27-1"), or SMILES string. Returns molecular formula and weight |

Parameters from the server's own tool schema.

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "science.chem.formula",
    "arguments": {
      "identifier": "<identifier>"
    }
  }
}
```

## Why science.chem.formula is rated Low

Retrieves chemical data without side effects; no modifications, execution, or destructive actions possible.

From the tool's own definition: "Get molecular formula and molecular weight for any compound by name"

## Use case

AI agents call science.chem.formula to retrieve information from Apibase without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

## Recommended policy (PolicyLayer)

Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Apibase:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "science.chem.formula": {}
  }
}
```

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## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=io-github-whiteknightonhorse-apibase · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/io-github-whiteknightonhorse-apibase