Get links to external databases (ChEMBL, DrugBank, KEGG, etc.)
AI agents call get_external_references to retrieve information from PubChem 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 and returns reference links—a retrieval operation with no capability to modify, delete, or execute actions. It is purely informational in nature. The blast radius of misuse is minimal: an agent could retrieve unwanted links but cannot cause data loss, financial impact, or code execution.
From the tool's definition Tool name 'get_external_references' and description indicate retrieval of links to external databases (ChEMBL, DrugBank, KEGG). The verb 'get' and the act of retrieving hyperlinks or metadata pointers are read-only operations with no side effects.
Attacks that exploit this kind of access
Get links to external databases (ChEMBL, DrugBank, KEGG, etc.). It is categorised as a Read tool in the PubChem MCP Server MCP Server, which means it retrieves data without modifying state.
Register the PubChem MCP Server MCP server in PolicyLayer and add a rule for get_external_references: 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 PubChem MCP Server. Nothing to install.
get_external_references 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 get_external_references 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 get_external_references. 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.
get_external_references is provided by the PubChem MCP Server MCP server (k-lordbodin7/pubchem-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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