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List contents of a package

umodel_list_objects

Lists objects inside an Unreal Engine package. Supports filtering, pagination, and JSON output for scripting.

Instructions

Run 'umodel -list ' to list objects contained in a package.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
jsonNoReturn machine-readable JSON instead of formatted text.
skipNoNumber of (filtered) lines to skip (pagination).
limitNoMax (filtered) lines to return (pagination).
filterNoCase-insensitive substring filter applied to output lines.
aesKeysNoAES keys for encrypted pak files (-aes=). Overrides session.
gameTagNoGame tag override (-game=), e.g. ue4.27 or an official tag like roco. Cooked UE4/5 games REQUIRE a tag — without it umodel pops a blocking GUI dialog. See umodel_game_list.
packageYesPackage name (with or without extension), wildcard, or full file path
gamePathNoGame installation directory (-path=). Overrides session. If unknown, ask the user first.
Behavior2/5

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

With no annotations, the description carries the full burden of behavioral disclosure. It only says 'list objects' without mentioning the read-only nature, output format, or the requirement for gameTag with cooked games (though the schema description hints at this). This is insufficient.

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?

The description is a single sentence that front-loads the command syntax and purpose. Every word is necessary, with no redundancy.

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?

Given 8 parameters and no output schema, the one-line description is inadequate. It fails to mention filtering, pagination, encryption, or what the return value looks like, leaving significant gaps for the agent.

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 detailed descriptions for all 8 parameters, so the baseline is 3. The description adds no extra parameter semantics, but the schema already provides rich meaning.

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 the tool lists objects in a package and provides the exact command syntax. It differentiates from sibling tools like umodel_list_packages by specifying the resource (objects vs packages), though it doesn't explicitly name alternatives.

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 is given on when to use this tool versus alternatives like pak_list or umodel_package_info. It simply says to run the command, leaving the agent without context for selection.

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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