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unity_script_update

Update the full source code of an existing C# script in Unity. Provide the asset path and new content to overwrite the script file.

Instructions

Update the contents of an existing C# script file.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
pathYesAsset path of the script
contentYesNew full C# source code content
portNoTarget Unity instance port for parallel-safe routing. Get this from unity_select_instance. When working with multiple Unity instances, ALWAYS include this parameter.
Behavior3/5

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

No annotations are provided, so the description carries the burden. It states 'Update' implying a write/mutation operation, but does not disclose if it overwrites entirely or patches, or whether it requires a specific Unity editor state. It adds the port parameter hint but no further behavioral details.

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 a single, clear sentence. It is concise and front-loaded with the action. No wasted words, but it could be slightly expanded for completeness.

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 no output schema, the description does not explain return values or errors. For a mutation tool with 3 parameters and no annotations, the description is adequate but not complete. It does not mention success indicators, side effects, or prerequisites.

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 description coverage is 100%, so the schema already documents all three parameters. The description does not add meaning beyond the schema; it simply names the operation. Baseline 3 is appropriate.

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 uses the specific verb 'Update' with the resource 'existing C# script file', clearly distinguishing it from related sibling tools like unity_script_create (create new) and unity_script_read (read).

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

Usage Guidelines4/5

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

The description implies when to use this tool (to modify an existing script), but does not explicitly mention when not to use it or provide alternatives. However, the sibling tools list includes clear alternatives (create, read), providing indirect 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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