Execute a SELECT query on the database
AI agents call query to retrieve information from Bun Database MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool is explicitly described as executing SELECT queries, which are read-only operations. However, the severity is medium because the tool executes raw queries against the database, and even SELECT queries can expose sensitive data at scale.
From the tool's definition Tool name is 'query' and description states 'Execute a SELECT query on the database'
Attacks that exploit this kind of access
Execute a SELECT query on the database. It is categorised as a Read tool in the Bun Database MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Bun Database MCP Server MCP server in PolicyLayer and add a rule for query: 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 Bun Database MCP Server. Nothing to install.
query 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 query 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 query. 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.
query is provided by the Bun Database MCP Server MCP server (ross-jill-ws/bun-db-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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