get_ligands · Mofstructure MCP: Risk & Policy

WHAT IT DOES

What get_ligands does on Mofstructure

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

WHY IT NEEDS A POLICY

Why get_ligands needs a policy

This tool retrieves or extracts ligand information from MOF structures—a non-destructive query operation. The empty description lowers confidence slightly, but the server's purpose (analyzing crystal structures) and naming convention (get_*) strongly suggest read-only data retrieval with no side effects. No modifications, execution, or financial implications are evident.

From the tool's definition Tool name 'get_ligands' combined with server context describing 'ligand identification' and 'structural characterization' indicates data retrieval.

Attacks that exploit this kind of access

Questions about get_ligands

What does the get_ligands tool do? +

get_ligands. It is categorised as a Read tool in the Mofstructure MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_ligands? +

Register the Mofstructure MCP server in PolicyLayer and add a rule for get_ligands: 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 Mofstructure. Nothing to install.

What risk level is get_ligands? +

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

Can I rate-limit get_ligands? +

Yes. Add a rate_limit block to the get_ligands 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 get_ligands completely? +

Set action: deny in the PolicyLayer policy for get_ligands. 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 get_ligands? +

get_ligands is provided by the Mofstructure MCP server (lichman0405/mofstructure-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.