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unity_packages_add

Add or install a Unity package to the project by providing its package identifier. Optionally specify a version using '@'.

Instructions

Add/install a Unity package by identifier (e.g. 'com.unity.cinemachine' or 'com.unity.cinemachine@3.0.0').

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
identifierYesPackage identifier, e.g. 'com.unity.cinemachine@3.0.0'
portNoTarget Unity instance port for parallel-safe routing. Get this from unity_select_instance. When working with multiple Unity instances, ALWAYS include this parameter.
Behavior2/5

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

No annotations are provided, and the description lacks details on side effects (e.g., overwriting, dependency resolution) or response behavior. It only states the basic action.

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 focused sentence with an illustrative example, no wasted words. It is concise and front-loaded.

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?

For a simple installation tool, the description covers the core function, but lacks explanation of potential errors, validation, or post-installation state. It is adequate for basic use.

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%, and the description adds marginal value by giving an example for 'identifier', but does not elaborate on constraints or behavior beyond what the schema already specifies.

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 verb 'Add/install' and the resource 'Unity package', with a concrete example identifier. This distinguishes it from siblings like unity_packages_list or unity_packages_remove.

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

Usage Guidelines3/5

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

The description implies the tool is for installing packages via identifier but provides no explicit guidance on when to use it versus alternatives, nor any prerequisites or conditions.

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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