Create a custom field in a custom field group
AI agents use planka_create_custom_field_in_group to create or update resources in Planka MCP Server for Claude — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Planka MCP Server for Claude environment.
This tool creates (adds) a new custom field to a field group, which is a reversible write operation. It modifies project metadata but does not execute arbitrary code, delete data, or move money. The medium severity reflects that misuse could clutter or disrupt project board schema, but changes are reversible and the blast radius is scoped to field definitions rather than core data or external systems.
From the tool's definition Tool name 'planka_create_custom_field_in_group' and description 'Create a custom field in a custom field group' indicate creation of new data structure (custom field) within a project management system.
Attacks that exploit this kind of access
Create a custom field in a custom field group. It is categorised as a Write tool in the Planka MCP Server for Claude MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Planka MCP Server for Claude MCP server in PolicyLayer and add a rule for planka_create_custom_field_in_group: 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 Planka MCP Server for Claude. Nothing to install.
planka_create_custom_field_in_group is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the planka_create_custom_field_in_group 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 planka_create_custom_field_in_group. 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.
planka_create_custom_field_in_group is provided by the Planka MCP Server for Claude MCP server (nextheberg/planka-mcp-server-for-claude). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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