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sattua

Blender MCP Server

by sattua

set_bone_rotation_keyframe

Insert a rotation keyframe on a pose bone by defining the armature, bone, frame, and rotation angles in radians.

Instructions

Insert a rotation keyframe (Euler XYZ radians) on a pose bone.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
frameYes
bone_nameYes
action_nameNo
armature_nameYes
rotation_eulerYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations provided. The description does not disclose side effects (e.g., overwriting keyframes), requirements, error handling, or undo behavior. Insufficient for safe agent usage.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness3/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Single sentence is concise but under-specified. Front-loaded with key info, but lacks balance due to missing details.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Description is incomplete given 5 parameters with no schema descriptions. Does not explain parameter purposes, behavior, or return values despite having an output schema.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters2/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%. The description only hints that rotation_euler is in radians but adds no meaning for other 4 parameters (frame, bone_name, action_name, armature_name).

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool inserts a rotation keyframe on a pose bone, specifying Euler XYZ radians. It distinguishes from other tools like list_bones or set_action_loop_mode.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance on when to use this tool versus alternatives, no prerequisites mentioned (e.g., armature must exist), and no when-not-to-use scenarios.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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