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aadeshrao123

Unreal-MCP

by aadeshrao123

apply_niagara_scratch_pad

Commits scratch pad module edits to the original Niagara script, mirroring the Apply button action. Requires system path and module name.

Instructions

Commit a scratch pad module's edit-copy to the original script (Apply button).

Mirrors FNiagaraScratchPadScriptViewModel::ApplyChanges. Requires the Niagara System to be open in the editor so the view model exists.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
module_nameYes
system_pathYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior3/5

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

Without annotations, the description must disclose behavior. It mentions 'commit...edit-copy to the original script' indicating mutation, and references the mirrored function. However, it lacks details on parameter effects, return values, failure conditions, or whether it is destructive. The prerequisite is noted, but overall depth is moderate.

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 two sentences long, front-loading the core action. It is concise but includes technical jargon ('FNiagaraScratchPadScriptViewModel::ApplyChanges') that may be opaque. The structure is efficient, but could be slightly more accessible.

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 the complexity of the Niagara scratch pad workflow and 0% schema coverage, the description is incomplete. It does not explain what a scratch pad module is, what 'edit-copy' means, or what happens after committing (e.g., overwrite, success/failure signals). The output schema is not shown, so the return value is unclear. More context is needed for a mutation tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters2/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The input schema has 2 required parameters with no descriptions, and schema description coverage is 0%. The description does not explain what 'module_name' or 'system_path' refer to, leaving the agent to infer from names alone. This fails to compensate for the missing schema descriptions.

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 tool's action: committing a scratch pad module's edit-copy to the original script, with an explicit UI analogy (Apply button) and reference to the underlying function. It distinguishes from siblings like 'apply_and_save_niagara_scratch_pad' by not mentioning saving.

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 provides a clear prerequisite: 'Requires the Niagara System to be open in the editor so the view model exists.' This tells the agent when the tool can be used. However, it does not explicitly state when to avoid using it or mention alternatives among siblings.

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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