First Prompt

# Situation
Currently running Live Blender session have opened a file from
`/media/<username>/Red_SSD_1T/3D_Visualizations/2026_May_PSRP/01_Assets/Props/Rig_Researching.blend`.
That file contain many armature objects. Focus on "Bird_Wing_Armature_Obj".
"Bird_Wing_Armature_Obj" have 186 bones.


# Mission
Change rotation mode of all secondary feather root bones from quaternion to
XYZ Euler. Currently, all secondary feather root bones are set to quaternion
rotation mode. Add drivers to Secondary Feather Root Bones number 2-11.
`SecondaryFeather1_Root.L` and `SecondaryFeather12_Root.L` local Z axis rotation
will be driving all other `SecondaryFeather<N>_Root.L` bones local Z rotation.


# Execution

#### Prerequisite
Read
- `~/SAI/docs/blender_mcp_minimal.md`
- `~/SAI/scripts/bl_armature_demo.py`
- `~/SAI/docs/bl_drivers_bone.md`
- `~/SAI/scripts/set_bone_driver.py`
- `~/SAI/docs/how_to_launch_blender_with_mcp_for_AI_agent.md`

Get child bones of `Ulna.L` bone but you must exclude `Metacarpus.L` and all
child bones of `Metacarpus.L`. `Metacarpus.L` is one of the child bones of `Ulna.L`.
`Ulna.L` bone have many child bones. Get child bones of `Ulna.L` but not all child bones.
Only the child bones that start with `SecondaryFeather<N>_Root.L`. Why not get
all child bones of `Ulna.L`? Not to waste tokens by reading unnecessary child bones.

There are 12 secondary feather root bones. Add drivers to secondary feather bones 2-11.
Verify success by rotating SecF1 root and SecF12 root on local z, get other bones rotation.
If other SecF2-11 rotate, it it success. Make sure timeline cursor is set to
frame 1 before validating.

Driver should work like this.
SecF1 root L -45 degree local Z rotation and SecF12 root L +45 degree should drive
other SecF bones. All inbetween should interpolate rotation between SecF1, SecF12.
Imagine if there are only 5 bones. SecF1, SecF2, SecF3, SecF4, SecF5.
While SecF1 == +45 degree and SecF5 == -45 degree, SecF2 == +22.5, SecF3 == 0,
SecF4 == -22.5 degree.

Prefer to work using mcp__blender with Live Blender GUI instance.
Write thrown away script to `/tmp` and read back `await tool.read /path/to/file`.
Do not write scripts inline. It is a waste to rewrite same code again and again.
Saving code as file in `/tmp` and editing code is more efficient then rewriting
inline code again and again.

MCP can crash Live running Blender due to script errors. If that happen,
relaunch Live Blender. If still fail to launch, work headlessly by directly opening
`Rig_Researching.blend` from script using bpy ops wm open main file API.
Run script using `~/.blender-venv/bin/python <yourscript>.py`. That venv have
`bpy` module installed. `bpy` module act like headless Blender.

`return` or `print` statement will not return result in mcp. Use `results`.


# Scope
You're authorized to use following directories.

Write Permissions.
`/tmp` to write thrown away scripts file

`~/.blender-venv/bin/python` to run scripts.

Read Permissions.
You're allow to read
- All Prerequisite files
- `~/b3d/*`

You are not authorized to read Blender Manual and Blender Python API files from
other than `~/b3d/*`.

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