Get the dataset schema: column names, types, measure types, levels, and row count.
AI agents call jamovi_get_schema to retrieve information from jamovi MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only queries and returns metadata about a dataset structure. It performs no write, delete, execute, or financial operations. The action is purely informational retrieval, fitting the Read category. Low severity because exposure of schema information alone does not enable destructive or harmful actions—it is passively retrievable data that does not depend on dangerous argument values.
From the tool's definition Tool name 'jamovi_get_schema' and description explicitly state it retrieves dataset schema information (column names, types, measure types, levels, row count) with no modification or side effects.
Attacks that exploit this kind of access
Get the dataset schema: column names, types, measure types, levels, and row count. It is categorised as a Read tool in the jamovi MCP MCP Server, which means it retrieves data without modifying state.
Register the jamovi MCP server in PolicyLayer and add a rule for jamovi_get_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 jamovi MCP. Nothing to install.
jamovi_get_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 jamovi_get_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 jamovi_get_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.
jamovi_get_schema is provided by the jamovi MCP server (yjm110517/jamovi-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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