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ActionBasecampUpdated June 2026

How do I post a message to a Basecamp project's board?

Short answer: You can post message to board in Basecamp by hand from its own interface, but it won’t repeat itself. On TinyCommand, add the Basecamp Post Message to Board action to a workflow, map its 5 inputs from any upstream app, and it runs automatically every time the trigger fires. No code, and a free tier to start.

Post Message to Board in Basecamp — start free All 4 Basecamp actions
Post Message to Board 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.

FieldTypeRequiredDescription
Project ID
project_id
stringRequiredThe Project ID assigned by Basecamp. Find via the corresponding list/search operation in this app. Use the exact ID, not a name or label.
Message Board ID
message_board_id
stringRequired–
Subject
subject
stringRequiredMessage subject line.
Body (HTML)
content
stringRequired–
Status
status
optionsOptional–
Sample request
{
  "project_id": "{{trigger.project_id}}",
  "message_board_id": "{{trigger.message_board_id}}",
  "subject": "e.g. Quick update",
  "content": "{{trigger.content}}",
  "status": "{{trigger.status}}"
}
Returns
{
  "id": 1111,
  "url": "https://basecamp.com/...",
  "subject": "FYI"
}

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

Triggered by

Apps that pair well as the trigger for Post Message to Board.

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

Gmail → Basecamp
1 Gmail triggers
Slack → Basecamp
13 Slack triggers
Google Sheets → Basecamp
2 Google Sheets triggers
HubSpot → Basecamp
18 HubSpot triggers
FAQ

Questions about Post Message to Board.

What does the Post Message to Board action do in Basecamp?
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.
What inputs does Post Message to Board require?
Required: Project ID, Message Board ID, Subject, Body (HTML). 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 workflow pauses on the failed node, the error message is captured in the run log, and you can retry the run with one click. Auto-retry policies are configurable per workflow with exponential backoff up to 5 attempts.
Does Post Message to Board support batch operations?
Yes. Run Post Message to Board inside a Loop node to process arrays. TinyCommand handles Basecamp's rate limits automatically so you don't have to throttle manually.
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
Create To-do
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.
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.
Post Message to Board in Basecamp — start free