AI agents call get_table_sample to retrieve information from Database without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a read-only operation that queries and returns sample data from a database table. It has no capability to modify, delete, or execute arbitrary operations. The blast radius is minimal — the only risk is potential exposure of sensitive data if the table contains it, but the operation itself is reversible and non-destructive. Classified as Read with low severity.
From the tool's definition Tool name is 'get_table_sample' and description states 'Get a sample of data from a table' — this retrieves a subset of table data with no modifications or side effects.
Documented attack patterns abuse exactly the kind of access get_table_sample gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Database, and nothing reaches the server without passing your rules. This is the rule we recommend for get_table_sample:
{
"version": "1",
"default": "deny",
"tools": {
"get_table_sample": {}
}
}get_table_sample is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get a sample of data from a table. It is categorised as a Read tool in the Database MCP Server, which means it retrieves data without modifying state.
Register the Database MCP server in PolicyLayer and add a rule for get_table_sample: 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 Database. Nothing to install.
get_table_sample 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_table_sample 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_table_sample. 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_table_sample is provided by the Database MCP server (theralabs/legion-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 10 Database tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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10 Database tools catalogued and risk-classified — across an index of 42,500+ MCP servers.