Set a data layer to Loaded, Activated, or Unloaded state in Unreal Engine.
Set the state of a data layer (Loaded, Activated, Unloaded).
| Name | Required | Description | Default |
|---|---|---|---|
| state | Yes | Target state | |
| layer_name | Yes | Data layer name |
Changes observed during successful MCP inspections.
v0.1.0Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must carry behavioral disclosure. It only says 'Set the state' without mentioning side effects, prerequisites, whether the operation is synchronous, or what happens if the layer does not exist. This is insufficient for a mutation tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single, direct sentence with no fluff or redundancy. It front-loads the action and immediately lists the valid states, exemplifying efficient structure.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a state-changing tool with no output schema and no annotations, the description is too bare. It lacks context about the data layer's lifecycle, potential side effects (e.g., unloading data), and any required preconditions. More explanation of the effect of each state would enhance completeness.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100%, so both parameters are documented. The description repeats the state enum values that are already in the schema, adding no extra meaning beyond what the schema provides. Thus it meets the baseline but no more.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the action (set) and the target (data layer state), and explicitly lists the three valid states. It distinguishes itself from sibling read tools like list_data_layers by indicating a mutation operation, though it does not explicitly reference alternatives.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
No guidance is provided on when to use this tool versus other data layer tools (e.g., list_data_layers, get_loaded_cells). There are no stated prerequisites or exclusions, 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.