AI agents call mcp_get_sample_values to retrieve information from Mcpql without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves sample data from a database column without modifying, executing, or deleting anything. It has minimal blast radius—an AI agent using this tool would only be able to view existing data, with no capability to alter state or trigger external operations. The 'Read' category is appropriate for query and retrieval operations with no side effects.
From the tool's definition The tool name 'mcp_get_sample_values' and description 'Get sample values from a specific column in a table' indicate a data retrieval operation.
Attacks that exploit this kind of access
Get sample values from a specific column in a table. It is categorised as a Read tool in the Mcpql MCP Server, which means it retrieves data without modifying state.
Register the Mcpql MCP server in PolicyLayer and add a rule for mcp_get_sample_values: 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 Mcpql. Nothing to install.
mcp_get_sample_values 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 mcp_get_sample_values 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 mcp_get_sample_values. 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.
mcp_get_sample_values is provided by the Mcpql MCP server (mcpql). 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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