AI agents call get_schema to retrieve information from Pbixray without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves schema metadata from PowerBI models, consistent with the Read category (queries data with no side effects). While the description is empty, the naming pattern and server context provide strong evidence of read-only metadata access. The severity is low because schema retrieval poses minimal risk—it exposes model structure but cannot modify data, execute code, or cause destructive actions.
From the tool's definition Tool name 'get_schema' combined with sibling tools (get_dax_columns, get_dax_measures, get_dax_tables, get_metadata, get_model_summary, get_relationships) all indicate metadata retrieval operations.
Documented attack patterns abuse exactly the kind of access get_schema gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Pbixray, and nothing reaches the server without passing your rules. This is the rule we recommend for get_schema:
{
"version": "1",
"default": "deny",
"tools": {
"get_schema": {}
}
}get_schema is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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get_schema. It is categorised as a Read tool in the Pbixray MCP Server, which means it retrieves data without modifying state.
Register the Pbixray MCP server in PolicyLayer and add a rule for 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 Pbixray. Nothing to install.
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 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 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.
get_schema is provided by the Pbixray MCP server (jonaolden/pbixray-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Pbixray, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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14 Pbixray tools catalogued and risk-classified — across an index of 43,000+ MCP servers.