list_schemas
AI agents call list_schemas to retrieve information from Fabric Dw Mcp Cli without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool performs a schema enumeration operation, which is a standard Read category action—it retrieves metadata about database structure with no side effects. Although the description is empty, the name clearly indicates a listing operation typical of information discovery. Severity is low because schema metadata exposure poses minimal direct risk compared to data exfiltration or destructive operations.
From the tool's definition Tool name 'list_schemas' indicates a retrieval operation that enumerates database schemas without modifying state.
Attacks that exploit this kind of access
list_schemas. It is categorised as a Read tool in the Fabric Dw Mcp Cli MCP Server, which means it retrieves data without modifying state.
Register the Fabric Dw Mcp Cli MCP server in PolicyLayer and add a rule for list_schemas: 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 Fabric Dw Mcp Cli. Nothing to install.
list_schemas 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 list_schemas 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 list_schemas. 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.
list_schemas is provided by the Fabric Dw Mcp Cli MCP server (sdebruyn/fabric-dw-mcp-cli). 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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