navigate_dataset
AI agents call navigate_dataset to retrieve information from Nipoppy MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool name 'navigate_dataset' suggests browsing or traversing a dataset structure, which aligns with a Read operation. The sibling tools are predominantly read/list operations (get_, list_), suggesting this tool likely follows the same pattern. However, the empty description significantly lowers confidence. Severity is medium given the sensitivity of clinical neuroimaging data that could be exposed.
From the tool's definition Tool name 'navigate_dataset' and server context of listing files and managing neuroimaging datasets; description is empty and uninformative.
Attacks that exploit this kind of access
navigate_dataset. It is categorised as a Read tool in the Nipoppy MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Nipoppy MCP Server MCP server in PolicyLayer and add a rule for navigate_dataset: 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 Nipoppy MCP Server. Nothing to install.
navigate_dataset 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 navigate_dataset 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 navigate_dataset. 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.
navigate_dataset is provided by the Nipoppy MCP Server MCP server (nipoppy/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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