Builder documentation has moved to Pylon

Where it went

Builder’s documentation is retired. Everything it covered is now documented under Pylon, which is the same workspace under its current name.

You are not in the wrong place, and nothing was deleted. Every retired /builder/… address redirects to its Pylon equivalent, so an old bookmark, a link in a ticket, or a URL pasted into a chat two years ago still lands on the page you wanted.

The part that trips people up

Retiring the documentation is not the same as retiring the product. Several things are still called Builder because that is what they are called in the product, and renaming them here would break real work:

Still called Builder	Where you meet it
builder-api.synthreo.ai	The live API host. Integrations point at it today
Builder API	The name of that API, including in its own documentation
target_app=builder	A value the token exchange accepts and expects
Builder app permission	The checkbox in Canopy that grants access
Builder Agents	The resource type on Canopy’s Sharing page
ThreoBuilder	Application 1 in Canopy’s own account screens

If you are reading a page that says Builder in one of those senses, it is current and correct. If you are reading one that describes the workspace, the canvas, or how to build something, that content is under Pylon now.

Where to go instead

You wanted	Go to
The workspace, and how it is laid out	Pylon Overview
Building your first automation	Create Your First Agent
The node canvas and its workflows	DAGs in Pylon
A specific node’s reference	The Node Category Reference lists every node by category
Testing and tracing a run	Pylon testing
The API	Builder API authentication

Why it moved

The product surface is Pylon. Keeping a Builder section beside it meant two sections describing one workspace, and the pages drifted apart - a reader who found the Builder copy of a page got advice that had stopped being true, with nothing on the page to say so.

One section that is current beats two where you have to guess which is.