# mychem.chemicals.batch_query

Retrieve annotations for up to 100 chemical compounds in a single request by providing an array of chemical names or identifiers. Returns ChEBI name, ChEMBL preferred name and clinical phase, PubChem CID, molecular formula and weight, DrugBank drug groups, and PharmGKB name for each compound in one call. Ideal for enriching compound lists from drug screening assays, annotating molecule libraries, building pharmacology databases, or cross-referencing chemicals across naming conventions (INN, brand names, IUPAC names). Compounds not found in any database are marked with found=false. Mix different name formats and identifiers freely in a single batch request.

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

## Facts

- Tool: `mychem.chemicals.batch_query`
- 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: 3 (1 required)
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `q` | array | yes | Array of chemical queries to look up in a single request. Each element can be a chemical name, synonym, or identifier (up to 100 entries). Example: ["aspirin", |
| `fields` | string | no | Comma-separated annotation fields to return for each chemical. Default: chebi.name, chebi.definition, chebi.formula, chebi.mass, chembl.pref_name, chembl.max_ph |
| `scopes` | string | no | Comma-separated fields to search within for each query in the batch. Default: chebi.name,chembl.pref_name,drugbank.name,pubchem.cid — searches across common nam |

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.batch_query",
    "arguments": {
      "q": []
    }
  }
}
```

## Why mychem.chemicals.batch_query is rated Low

Tool retrieves and enriches chemical data without modifying, deleting, or executing operations.

From the tool's own definition: "Retrieve annotations for up to 100 chemical compounds in a single request"

## Use case

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

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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