Verify the Cavalry bridge and dispatcher are reachable. Returns the host platform.

List every layer as {id, type, name}.

Get the current layer selection.

Get composition resolution, frame range, and FPS.

Read an attribute value from a layer.

Get bounding box of a layer. Returns {x, y, width, height, centre, left, right, top, bottom}.

List every attribute on a layer with its type, nice name, children and animated flag. Use this INSTEAD of guessing attribute paths — attribute names are not derivable from the UI labels in Cavalry's docs, and a wrong path fails silently on write.

List every creatable layer type ID. These are the scripting IDs accepted by cavalry_create_layer, which differ from the display names in Cavalry's UI and docs (e.g. 'Shuffle String Manipulator' is created as 'shuffleString').

List a layer's incoming and outgoing attribute connections, plus its animated attributes. Use this to confirm a cavalry_connect actually landed and to discover which input a node type expects.

Create a layer by type ID (textShape, null, colorPlane, subMesh, stagger, duplicator, …).

Create a basicShape with a generator pre-attached. Prefer this over create_layer + set_generator for primitives.

Set one or more attributes on a layer in a single call.

Set the generator on a layer.

Set the current selection to the given layer IDs.

Delete layers by ID.

Duplicate layers. Restores the prior selection afterward.

Parent one or more layers to a target parent.

Add a dynamic attribute to a layer.

Connect one layer's attribute output to another layer's attribute input. Used for procedural/data-driven workflows (e.g. connecting a shape to a duplicator's 'shapes' input, or a noise layer's output to a position attribute).

Set keyframes on one or more attributes at a given frame.

Apply a Magic Easing preset to a keyframe. Linear is NOT a valid Magic Easing preset.

Delete a keyframe at a specific frame.

Set the playhead to a specific frame.

Start playback.

Save the current scene. Pass filePath for Save As.

Load a scene from disk.

Render the current frame (or a specific frame) to a PNG file.

Run a sequence of operations in one HTTP round-trip (fail-fast, not atomic). Layer IDs from earlier creates are NOT auto-substituted — predict sequential IDs or split into multiple batches.