AI agents call query to retrieve information from Lucid without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only retrieves data through SELECT queries without side effects. It cannot modify, delete, or execute arbitrary code. The explicit 'read-only' and 'SELECT only' constraints confirm it belongs in the Read category with low severity, as misuse would only expose information rather than cause destructive or financial harm.
From the tool's definition Tool name 'query' with description 'Execute a read-only SQL query (SELECT only)' explicitly restricts to SELECT statements with no data modification or deletion capabilities.
Attacks that exploit this kind of access
Execute a read-only SQL query (SELECT only). Returns results in JSON, markdown, or CSV format. It is categorised as a Read tool in the Lucid MCP Server, which means it retrieves data without modifying state.
Register the Lucid 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 Lucid. 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 Lucid MCP server (wiseriaai/lucid-skill). 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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