AI agents call kinbox_list_custom_fields to retrieve information from Kinbox without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool lists/retrieves custom field configurations from the Kinbox system. It is a read-only query operation with no side effects, no data modification, no code execution, and no irreversible actions. The blast radius of misuse is minimal—an attacker gains visibility into system configuration but cannot alter or delete data.
From the tool's definition Tool name 'kinbox_list_custom_fields' and description 'Lista campos personalizados configurados no Kinbox' (List custom fields configured in Kinbox) indicate a retrieval operation with no modification or execution.
Attacks that exploit this kind of access
Lista campos personalizados configurados no Kinbox. It is categorised as a Read tool in the Kinbox MCP Server, which means it retrieves data without modifying state.
Register the Kinbox MCP server in PolicyLayer and add a rule for kinbox_list_custom_fields: 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 Kinbox. Nothing to install.
kinbox_list_custom_fields 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 kinbox_list_custom_fields 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 kinbox_list_custom_fields. 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.
kinbox_list_custom_fields is provided by the Kinbox MCP server (vergamini65-boop/kinbox-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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