Get sample rows from a table for quick preview
AI agents call sample_data to retrieve information from Querybridge without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves data for inspection purposes only. It queries a table and returns rows without side effects or the ability to modify state. The 'quick preview' language confirms it is a read-only introspection tool. Even in a database context with a multiplicity of risky sibling tools (execute_query, compare_schemas, generate_migration), this specific tool is clearly constrained to retrieval.
From the tool's definition Tool name is 'sample_data' and description states 'Get sample rows from a table for quick preview' — no modification, deletion, or execution capability implied.
Attacks that exploit this kind of access
Get sample rows from a table for quick preview. It is categorised as a Read tool in the Querybridge MCP Server, which means it retrieves data without modifying state.
Register the Querybridge MCP server in PolicyLayer and add a rule for sample_data: 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 Querybridge. Nothing to install.
sample_data 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 sample_data 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 sample_data. 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.
sample_data is provided by the Querybridge MCP server (mahmoudhassanmustafa/querybridge-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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