Manage extension measures (report-level DAX in reportExtensions.json). Empty file crashes PBI Desktop — tool auto-deletes when empty.
AI agents call pbir_manage_extension_measures to permanently remove resources in Power BI Report MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Although the primary purpose is managing (creating/updating) extension measures, the tool explicitly performs an auto-delete of the reportExtensions.json file when empty. Deletion of a file is irreversible without backups, making this Destructive. The blast radius is high because deleting or corrupting this file could crash Power BI Desktop and break the entire report.
From the tool's definition 'auto-deletes when empty' — the tool automatically deletes the reportExtensions.json file when it becomes empty, which is an irreversible destructive action on the file system.
Attacks that exploit this kind of access
Manage extension measures (report-level DAX in reportExtensions.json). Empty file crashes PBI Desktop — tool auto-deletes when empty. It is categorised as a Destructive tool in the Power BI Report MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Power BI Report MCP Server MCP server in PolicyLayer and add a rule for pbir_manage_extension_measures: 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 Power BI Report MCP Server. Nothing to install.
pbir_manage_extension_measures is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the pbir_manage_extension_measures 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 pbir_manage_extension_measures. 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.
pbir_manage_extension_measures is provided by the Power BI Report MCP Server MCP server (jonathan-pap/powerbi-report-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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