Attach files to tasks. Supports URL attachments (links, images, documents) and file uploads. Use taskId (preferred), taskName, or customTaskId to identify task. Files are attached to task and visible in attachments section.
AI agents use attach_file_to_task to create or update resources in ClickUp MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your ClickUp MCP environment.
This tool modifies existing tasks by adding attachments—a write operation that creates new associations between files and tasks. The action is reversible (attachments can be removed). It does not execute code, delete data, or move money.
From the tool's definition Tool description states 'Attach files to tasks' and 'Files are attached to task', indicating it creates or modifies task data by adding attachments.
Attacks that exploit this kind of access
Attach files to tasks. Supports URL attachments (links, images, documents) and file uploads. Use taskId (preferred), taskName, or customTaskId to identify task. Files are attached to task and visible in attachments section. It is categorised as a Write tool in the ClickUp MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the ClickUp MCP server in PolicyLayer and add a rule for attach_file_to_task: 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 ClickUp MCP. Nothing to install.
attach_file_to_task 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 attach_file_to_task 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 attach_file_to_task. 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.
attach_file_to_task is provided by the ClickUp MCP server (twofeetup/clickup-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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