Analyze dataset structure, classify columns, and compute measurement stats.
AI agents call discover_schema to retrieve information from Rockfish MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool performs schema discovery and statistical analysis on datasets. These are non-destructive, read-only query operations that retrieve information about data structure and characteristics. There are no side effects, no data mutations, and no external operations triggered. This aligns with the 'Read' category definition: retrieves or queries data with no side effects.
From the tool's definition Tool description states it 'Analyze[s] dataset structure, classify[es] columns, and compute[s] measurement stats' — purely read-only operations that inspect and report on existing data without modification, creation, or deletion.
Attacks that exploit this kind of access
Analyze dataset structure, classify columns, and compute measurement stats. It is categorised as a Read tool in the Rockfish MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Rockfish MCP Server MCP server in PolicyLayer and add a rule for discover_schema: 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 Rockfish MCP Server. Nothing to install.
discover_schema 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 discover_schema 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 discover_schema. 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.
discover_schema is provided by the Rockfish MCP Server MCP server (wolfdancer/rockfish-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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