# mychem.chemicals.metadata

Retrieve build metadata and data source statistics for the MyChem.info API. Returns the current database build version (e.g. "20260525"), build date, total number of chemical records (197M+), and a list of integrated annotation sources with their versions, URLs, and license information. Sources include DrugBank, ChEMBL, ChEBI, PubChem, PharmGKB, SIDER, DrugCentral, UMLS, NDC, UniChem, GSRS, FDA Orphan Drug, GtoPdb (pharmacology), AEOLUS (adverse events), GINAS, and UNII. Use to verify data currency before large annotation jobs or to cite specific source versions in research publications.

Agent View of the PolicyLayer registry record for `mychem.chemicals.metadata`. HTML page: https://policylayer.com/tools/io-github-whiteknightonhorse-apibase/mychem.chemicals.metadata

## Facts

- Tool: `mychem.chemicals.metadata`
- 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
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `detail` | boolean | no | If true, include full source metadata with download dates, record counts per source, code repository links, and license URLs. If false (default), return only bu |

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": "mychem.chemicals.metadata",
    "arguments": {}
  }
}
```

## Why mychem.chemicals.metadata is rated Low

Only retrieves metadata about the API; no side effects or data modification.

From the tool's own definition: "Retrieve build metadata and data source statistics"

## Use case

AI agents call mychem.chemicals.metadata 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": {
    "mychem.chemicals.metadata": {}
  }
}
```

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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