Find organisms by their Taxonomic Serial Number (TSN) in the ITIS database. Use this when you already have a TSN.
AI agents call search_by_tsn to retrieve information from ITIS MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves taxonomic information from the ITIS database based on a provided TSN identifier. It performs a simple lookup query with no capability to modify, delete, or execute external operations. The operation is read-only with no side effects, fitting the 'Read' category.
From the tool's definition Tool description states 'Find organisms by their Taxonomic Serial Number (TSN)' - a lookup/query operation with no modification or side effects. The verb 'Find' and context of searching a taxonomic database indicates pure data retrieval.
Attacks that exploit this kind of access
Find organisms by their Taxonomic Serial Number (TSN) in the ITIS database. Use this when you already have a TSN. It is categorised as a Read tool in the ITIS MCP Server MCP Server, which means it retrieves data without modifying state.
Register the ITIS MCP Server MCP server in PolicyLayer and add a rule for search_by_tsn: 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 ITIS MCP Server. Nothing to install.
search_by_tsn 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 search_by_tsn 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 search_by_tsn. 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.
search_by_tsn is provided by the ITIS MCP Server MCP server (knustx/itis-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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