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create_task

Create a task in a ClickUp list. Set its name, description, status, priority, due date, assignees, and custom fields.

Instructions

Create a task in a List.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
list_idYesList ID.
nameYes
descriptionNoPlain-text description.
markdown_contentNoMarkdown description (overrides description).
statusNo
priorityNo1=urgent .. 4=low, null clears.
due_dateNoDate as ISO string, epoch ms, or relative ("tomorrow", "in 3 days", "+2h").
due_date_timeNo
start_dateNoDate as ISO string, epoch ms, or relative ("tomorrow", "in 3 days", "+2h").
start_date_timeNo
time_estimateNoEstimate in milliseconds.
assigneesNoFull set of assignee user ids. On update this REPLACES the current assignees (use assignees_add/assignees_rem for incremental changes).
tagsNo
parentNoParent task id (makes this a subtask).
custom_fieldsNoArray of { id, value } custom field assignments.
custom_item_idNoCustom task type id.
custom_task_idsNoTreat task_id as a custom id (requires team_id).
team_idNoTeam/Workspace ID. Falls back to CLICKUP_TEAM_ID when omitted.
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries full burden for behavioral disclosure. It only states a generic mutation ('Create') without mentioning side effects, auth requirements, rate limits, or what happens with optional fields. This is insufficient for an 18-parameter tool.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is extremely concise (5 words) and avoids redundancy. It is front-loaded with the action and object. However, it could be slightly expanded to include the required parameter 'name' without losing conciseness.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given 18 parameters (many optional), no output schema, and no annotations, the description is far from complete. It does not clarify parameter interdependencies, default behaviors, or what the return value is. A much richer description is needed for this complex tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 72%, so the schema already documents most parameters. The description adds no additional meaning beyond what is in the schema. Baseline of 3 is appropriate since the schema does the heavy lifting and the description is neutral.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description 'Create a task in a List' clearly states the action (create), resource (task), and container (List). While it is effective and distinguishes from sibling tools like update_task or delete_task, it could be more specific about scope or optional details.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is provided on when to use this tool vs alternatives such as create_bulk_tasks, add_task_to_list, or update_task. The description lacks context about prerequisites, edge cases, or complementary methods.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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