Do I have to send every field to update one?

No. These tools take the task id plus the fields you want to change, and leave the rest as they were. An agent supplies just the new status or assignee, which avoids overwriting parts of the task it did not mean to touch.

How is this different from creating a task?

Creating files a new task; updating edits one that already exists. Most automation is updates, moving a task to done, reassigning it, pushing a date, since a board's tasks change state far more often than new ones are filed. The create page is separate.

MCP servers that can update a task

3 verified servers expose a tool that can update a task

Most of a task's life is edits: the status moves, the due date slips, someone reassigns it. Updating a task changes those fields on a task that already exists, so an agent can keep a board current as work progresses rather than only filing new tasks.

These verified servers let an agent update a task.

Top pick

ClickUp

Official

ClickUp's official remote MCP server lets agents manage tasks, lists, folders, docs, time tracking, and chat across a workspace.

productivity

Tool:

update_task

ClickUp's update_task changes a task's name, status, assignees, or dates, the broad edit for a board an agent keeps current.

Pick 2

Close

Official

Close's official remote MCP server connects AI agents to the Close sales CRM over OAuth to read, create, and update leads, contacts, and deals.

crm

Tool:

update_task

On Close, update_task changes the fields on an existing task, fitting an agent managing follow-ups inside the CRM.

Pick 3

Attio

Official

Attio's official remote MCP server connects AI agents to your CRM over OAuth to search, read, create, and update records, lists, notes, and more.

crm

Tool:

update-task

For tasks tied to a CRM record, update-task edits the deadline, status, assignee, or linked object in Attio.

What to know

The update is where task automation gets useful. An agent that moves a task to done when its work finishes, pushes a deadline, or reassigns a stalled item is editing state, not creating it. The tools here change the same kind of fields: ClickUp the name, status, assignees, and dates; Close the task's fields; Attio the deadline, status, assignee, or linked record. The move is to name the task and supply only what changes, leaving the rest alone, which keeps an edit from clobbering fields it did not mean to touch.

This is where remembering the last state pays off. An agent that re-applies the same update across sessions, or moves a task someone already moved, creates noise in the activity log. Knowing the state it last set keeps the edits idempotent and the board honest.

Questions

Do I have to send every field to update one?: No. These tools take the task id plus the fields you want to change, and leave the rest as they were. An agent supplies just the new status or assignee, which avoids overwriting parts of the task it did not mean to touch.
How is this different from creating a task?: Creating files a new task; updating edits one that already exists. Most automation is updates, moving a task to done, reassigning it, pushing a date, since a board's tasks change state far more often than new ones are filed. The create page is separate.