Retrieve all available values for a specific parameter in a Metabase card - use this to populate dropdown filters, validate parameter inputs, or understand what data options are available for interactive cards
AI agents call get_card_param_values to retrieve information from Metabase MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and exposes existing parameter values from a card without modifying, creating, deleting, or executing any operations. It is purely informational—helping populate UI elements and validate inputs. The blast radius of misuse is minimal; an attacker could learn what parameter options exist but cannot manipulate data or trigger actions.
From the tool's definition Tool description explicitly states 'Retrieve all available values' and is used to 'populate dropdown filters, validate parameter inputs, or understand what data options are available'.
Attacks that exploit this kind of access
Retrieve all available values for a specific parameter in a Metabase card - use this to populate dropdown filters, validate parameter inputs, or understand what data options are available for interactive cards. It is categorised as a Read tool in the Metabase MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Metabase MCP Server MCP server in PolicyLayer and add a rule for get_card_param_values: 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 Metabase MCP Server. Nothing to install.
get_card_param_values 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_card_param_values 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_card_param_values. 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_card_param_values is provided by the Metabase MCP Server MCP server (thangnm93/metabase-mcp-server). 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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