Run a SELECT query and return rows as JSON
AI agents call query to retrieve information from Mysql Multi without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool is restricted to SELECT queries, which are read-only operations that retrieve data without side effects. While the broader server includes destructive and write operations (drop-database, drop-table, alter-table, execute), this specific tool is limited to data retrieval. Severity is low because misuse would only expose data, not cause irreversible changes or execute arbitrary operations.
From the tool's definition Tool name 'query' with description 'Run a SELECT query and return rows as JSON' indicates retrieval-only operation. SELECT queries cannot modify, delete, or execute code.
Attacks that exploit this kind of access
Run a SELECT query and return rows as JSON. It is categorised as a Read tool in the Mysql Multi MCP Server, which means it retrieves data without modifying state.
Register the Mysql Multi 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 Mysql Multi. 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 Mysql Multi MCP server (pchimbolo/mysql-multi-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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