Perform structure-based searches in PubChem including identity, substructure, superstructure, and similarity searches. Input chemical structures as SMILES, InChI, SDF, or MOL.
AI agents call pubchem_structure_search to retrieve information from Entrez MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries a scientific database (PubChem) and returns search results without side effects. It is purely a retrieval operation—no data creation, modification, or deletion occurs. The query input is a chemical structure, not code execution. Severity is low because misuse causes only information disclosure of publicly available chemical data.
From the tool's definition Tool performs 'structure-based searches' and 'retrieve[s]' data from PubChem; accepts chemical structure formats (SMILES, InChI, SDF, MOL) as query input with no mention of modification, deletion, or execution capabilities.
Attacks that exploit this kind of access
Perform structure-based searches in PubChem including identity, substructure, superstructure, and similarity searches. Input chemical structures as SMILES, InChI, SDF, or MOL. It is categorised as a Read tool in the Entrez MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Entrez MCP Server MCP server in PolicyLayer and add a rule for pubchem_structure_search: 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 Entrez MCP Server. Nothing to install.
pubchem_structure_search is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the pubchem_structure_search 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.
Set action: deny in the PolicyLayer policy for pubchem_structure_search. 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.
pubchem_structure_search is provided by the Entrez MCP Server MCP server (leongxj123/entrez-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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