ActionBasecampUpdated September 2026

How do I add a to-do to a Basecamp list?

Short answer: You can create to-do in Basecamp by hand from its own interface, but it won’t repeat itself. On TinyCommand, add the Basecamp Create To-do action to a workflow, map its 6 inputs from any upstream app, and it runs automatically every time the trigger fires. No code, and a free tier to start.

Create To-do in Basecamp — start free All 4 Basecamp actions

Create To-do in Basecamp — start free

Inputs

The fields this action accepts.

Every field can be mapped from an upstream trigger, AI step, table row, or hard-coded literal.

Field	Type	Required	Description
Project ID project_id	string	Required	The Project ID assigned by Basecamp. Find via the corresponding list/search operation in this app. Use the exact ID, not a name or label.
To-do List ID todoset_id	string	Required	–
Title content	string	Required	–
Description (HTML) description	string	Optional	–
Assignee user IDs assignee_ids	array	Optional	–
Due Date due_on	string	Optional	YYYY-MM-DD

Sample request

{
  "project_id": "{{trigger.project_id}}",
  "todoset_id": "{{trigger.todoset_id}}",
  "content": "{{trigger.content}}",
  "description": "{{trigger.description}}",
  "assignee_ids": "{{trigger.assignee_ids}}"
}

Returns

{
  "id": 9876,
  "url": "https://basecamp.com/...",
  "status": "active",
  "content": "Follow up"
}

Use these fields in downstream nodes for routing, logging, or error handling.

Triggered by

Apps that pair well as the trigger for Create To-do.

Any of these apps can fire this action as part of a workflow.

Google Sheets → Basecamp

2 Google Sheets triggers

HubSpot → Basecamp

18 HubSpot triggers

FAQ

Questions about Create To-do.

What does the Create To-do action do in Basecamp?

Adds a to-do to a specific list within a project with optional assignees, due date, and notes. The standard hook for "external event → create the corresponding task in Basecamp" patterns. Pin the list ID at workflow setup.

What inputs does Create To-do require?

Required: Project ID, To-do List ID, Title. Every input accepts a static value or a variable from any upstream node in your workflow.

Can I use dynamic inputs from earlier workflow nodes?

Yes. Any field on this action can pull values from upstream nodes, whether that's a form response, a trigger payload, an AI output, or a lookup result.

What happens if Basecamp returns an error?

The run history shows the failed step with its input and the error message Basecamp returned, so you can fix the input and run the workflow again. Automatic retries are built into HTTP steps only, where you can also set your own retry count and delay.

Does Create To-do support batch operations?

Run Create To-do inside a loop to process each item in an array. TinyCommand does not throttle calls for you, so for large arrays add a Delay step if you need to stay within Basecamp's rate limits.

More actions

Other Basecamp actions.

Action

Complete To-do

Transitions a to-do to the completed state. Assignees get the standard Basecamp completion notification. Useful for "external CI run finished green → mark the deployment to-do done" cascading workflows.

Action

Post Message to Board

Posts a message to the project's message board — the place teams use for longer-form updates and discussion (vs the Campfire chat tool for ephemera). Useful for "weekly automated project digest → post to the project board" workflows.

Action

List Projects

Returns all active Basecamp projects the connected user is a member of. Useful for project-picker UIs in workflow setup or for cross-project reporting workflows that iterate over projects to gather metrics.

Create To-do in Basecamp — start free