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assets-modify

Update asset file contents in the Unity Assets/ folder by providing a JSON diff of serialized members. Inspect assets first using assets-get-data to ensure correct structure.

Instructions

Modify asset file in the project. Use 'assets-get-data' tool first to inspect the asset structure before modifying. Not allowed to modify asset file in 'Packages/' folder. Please modify it in 'Assets/' folder.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
assetRefYesAsset reference. SCHEMA: {"assetPath":"Assets/path/to/asset"} or {"instanceID":12345}
contentYesJSON string of SerializedMember diff to apply. SCHEMA: {"props":[{"name":"propertyName","value":any}],"fields":[{"name":"fieldName","value":any}]}
Behavior4/5

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

With no annotations, the description carries full burden. It declares modification behavior and adds a constraint (no Packages/). However, it lacks details on success/failure outcomes or permission requirements, which would improve transparency.

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

Conciseness5/5

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

Three sentences, front-loaded with purpose, no redundant information. Every sentence adds value.

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

Completeness4/5

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

Given the complexity of nested object parameters and no output schema, the description covers essential usage preconditions (inspection step, folder restriction). However, it omits description of return value or error conditions, which could help in complete understanding.

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?

Schema coverage is 100% with descriptions for both parameters. The description adds practical usage context (using get-data for assetRef) but does not elaborate on parameter specifics beyond the schema.

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 begins with 'Modify asset file in the project' which clearly specifies the verb (modify) and resource (asset file). It distinguishes itself from sibling tools like 'assets-get-data' (read) and other asset modification tools.

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

Usage Guidelines5/5

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

Explicitly instructs to use 'assets-get-data' first to inspect structure, and states prohibition on modifying files in 'Packages/' folder, suggesting 'Assets/' instead. This provides clear when-to-use and when-not-to-use guidance.

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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