AI agents call ESummary to retrieve information from Ncbi without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
ESummary is a query-only tool that retrieves and returns bibliographic or sequence summaries from NCBI databases without altering any data. This is a classic Read operation with minimal risk—it only fetches pre-existing data from public databases.
From the tool's definition Tool description states 'ids为要查询项的id，db为要查询的库' (retrieves summary data by IDs from specified database). No modification, deletion, or execution of external operations is described.
Attacks that exploit this kind of access
ids为要查询项的id，db为要查询的库，如不提供db，则默认在pubmed库中查找。返回结果为所在库的summary。. It is categorised as a Read tool in the Ncbi MCP Server, which means it retrieves data without modifying state.
Register the Ncbi MCP server in PolicyLayer and add a rule for ESummary: 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 Ncbi. Nothing to install.
ESummary 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 ESummary 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 ESummary. 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.
ESummary is provided by the Ncbi MCP server (qigoki/ncbi-mcp). 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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