search_chembl

Search the ChEMBL database for bioactive molecules. Find compounds by target, molecule name, or similar structure. Returns bioactivity data, assay results, and compound information.

ServerMedSci Agent
CategoryRead

How to control search_chembl ↓

WHAT IT DOES

What search_chembl does on MedSci Agent

AI agents call search_chembl to retrieve information from MedSci Agent without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

THE RISK

Low Risk

Why search_chembl needs a policy

search_chembl retrieves and queries data from the ChEMBL database without side effects. It searches by target, molecule name, or structure and returns informational results. There is no indication of data modification, deletion, code execution, or financial operations. The tool fits the Read category as a straightforward data retrieval operation.

From the tool's definition The tool description explicitly states it 'Search[es] the ChEMBL database' and 'Returns bioactivity data, assay results, and compound information.' These are read-only query operations with no mention of modification, deletion, or execution capabilities.

Documented attack patterns abuse exactly the kind of access search_chembl gives an agent:

POLICY

How to control search_chembl

PolicyLayer is an MCP gateway — it sits between your AI agents and MedSci Agent, and nothing reaches the server without passing your rules. This is the rule we recommend for search_chembl:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "search_chembl": {}
  }
}

search_chembl is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register MedSci Agent — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about search_chembl

What does the search_chembl tool do? +

Search the ChEMBL database for bioactive molecules. Find compounds by target, molecule name, or similar structure. Returns bioactivity data, assay results, and compound information. It is categorised as a Read tool in the MedSci Agent MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on search_chembl? +

Register the MedSci Agent MCP server in PolicyLayer and add a rule for search_chembl: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches MedSci Agent. Nothing to install.

What risk level is search_chembl? +

search_chembl is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit search_chembl? +

Yes. Add a rate_limit block to the search_chembl rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block search_chembl completely? +

Set action: deny in the PolicyLayer policy for search_chembl. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides search_chembl? +

search_chembl is provided by the MedSci Agent MCP server (omar-a-hassan/medsci-agent). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MedSci Agent tool call.

Start from MedSci Agent, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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28 MedSci Agent tools catalogued and risk-classified — across an index of 43,000+ MCP servers.