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whats2000

Isaac Sim MCP Server

by whats2000

modify_light

Change an existing light's intensity and color in the simulation scene by specifying its prim path.

Instructions

Modify properties of an existing light.

Args: prim_path: The prim path of the light to modify. intensity: New intensity value. color: [r, g, b] new light color (0-1).

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
prim_pathYes
intensityNo
colorNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior2/5

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

No annotations provided, and the description lacks behavioral details such as error handling (e.g., if prim_path is invalid), side effects, or permission requirements. The description only states 'modify properties' without further elaboration.

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

Conciseness4/5

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

The description is concise: a single purpose line followed by clear argument definitions. It avoids unnecessary words, but the docstring format is slightly verbose for a tool description.

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

Completeness3/5

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

Given the simplicity of the tool and presence of an output schema (though not shown), the description covers basic functionality. However, it omits error cases and preconditions, which are important for contextual completeness.

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

Parameters3/5

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

With 0% schema description coverage, the description adds meaning for intensity ('New intensity value') and color ('[r, g, b] new light color (0-1)'), clarifying format and range. However, prim_path is not explained, leaving some ambiguity.

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

Purpose4/5

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

The description clearly states 'Modify properties of an existing light,' specifying the verb and resource. It distinguishes from siblings like create_light and delete_object. However, it could be more explicit about which properties are modifiable beyond the listed parameters.

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 like create_light or transform_object. No context about prerequisites (e.g., light must already exist) or exclusions.

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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