AI agents call list_sql_processors to retrieve information from Lenses MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns information about existing SQL processors without creating, modifying, deleting, or executing any operations. It is a straightforward read operation that poses minimal risk when misused by an AI agent, as it only exposes information about Kafka SQL processors.
From the tool's definition Tool name 'list_sql_processors' and description 'Retrieves all SQL processor details' indicate a data retrieval operation with no modification or side effects.
Documented attack patterns abuse exactly the kind of access list_sql_processors gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Lenses MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_sql_processors:
{
"version": "1",
"default": "deny",
"tools": {
"list_sql_processors": {}
}
}list_sql_processors is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Retrieves all SQL processor details. It is categorised as a Read tool in the Lenses MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Lenses MCP Server MCP server in PolicyLayer and add a rule for list_sql_processors: 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 Lenses MCP Server. Nothing to install.
list_sql_processors 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 list_sql_processors 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 list_sql_processors. 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.
list_sql_processors is provided by the Lenses MCP Server MCP server (lensesio/lenses-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Lenses MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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42 Lenses MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.