blender-expressions

name	blender-expressions
description	Blender driver and expression system — add/edit/remove drivers, manage driver variables, evaluate expressions
license	MIT
allowed-tools	["Bash","Read"]
metadata	{"dcc-mcp":{"dcc":"blender","version":"1.0.0","tags":["blender","driver","expression","animation","rigging","constraints"],"search-hint":"driver, expression, fcurve driver, scripted expression, driver variable, evaluate driver, add driver, remove driver","search-aliases":["animation driver","driven property","expression controller","driver namespace","driver variable target","RNA driver"],"intent":"Add, edit, and remove Blender drivers; manage driver variables; evaluate expression results. Equivalent to Maya expression editor and connection editor.","recall-context":{"app_type":"blender","domain":"animation","workflow_stage":"rigging","task_category":"mutate"},"preconditions":[{"type":"software","name":"blender","version":">=4.0"},{"type":"scene_state","predicate":"has_open_scene"}],"side-effects":{"modifies":true,"creates":true,"targets":["driver","driver_variable","fcurve","animation_data"]},"produces":["driver_info","driver_list","evaluated_value"],"requires":[],"tools":"tools.yaml"}}

blender-expressions

Blender driver and expression skill. Use it to:

• Add drivers to any animatable property (add_driver) with types SCRIPTED, AVERAGE, SUM, MIN, MAX.
• Edit driver expressions without replacing the whole driver (set_driver_expression).
• Manage driver variables — add (add_driver_variable) and remove (remove_driver_variable) the named variables a scripted expression can reference.
• Inspect all drivers on an object or scene-wide (list_drivers).
• Evaluate the current driven value at the scene frame (evaluate_driver_expression).
• Remove drivers cleanly (remove_driver).

This skill maps roughly to Maya's Expression Editor and Set Driven Key workflow. Use blender-animation for plain keyframes and blender-rigging for bone/constraint setups.