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blueprint_set_variable_default

Set a Blueprint variable's default value, then compile and save the asset to apply the new default.

Instructions

Set a member variable's default value, then compile and save.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "blueprint_path": "<blueprint_path>",
      "name": "<name>"
    },
    "name": "blueprint_set_variable_default"
  }
}

Input Schema

NameRequiredDescriptionDefault
nameYesVariable name.
default_valueNoNew default value (JSON-serializable).
blueprint_pathYesContent path of the Blueprint asset, e.g. /Game/Blueprints/BP_Door.

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.4.0

TDQS

A3.5/5.0
Behavior3/5

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

The description discloses a key side effect—'then compile and save'—which is significant and not present in annotations (since there are none). However, it does not explain behavior when the variable doesn't exist, whether default_value is optional, or the reversibility of changes. With no annotations, the description carries more burden and only partially meets it.

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, concise sentence that front-loads the action and includes the key side effects. Every word earns its place; nothing is redundant.

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 mutation tool with no annotations and no output schema, the description is thin. It states the operation and side effects, but lacks usage context, error/edge-case behavior, and details about optional parameters. The schema covers parameters, but overall contextual completeness is moderate at best.

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?

The schema already provides 100% coverage of parameter descriptions, so the description does not need to add parameter details. It does add a small semantic clarification that the variable is a 'member variable,' but overall it provides no meaningful parameter info beyond the schema. Baseline 3 applies.

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 a specific verb ('Set') and resource ('member variable's default value'), clearly distinguishing it from sibling tools like blueprint_add_variable or blueprint_compile. It also notes the post-actions (compile and save), which further clarifies the tool's full purpose.

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?

The description provides no guidance on when to use this tool versus alternatives, nor any prerequisites or exclusions. It only states the action, leaving the agent to infer usage from the name and schema. This is a clear gap.

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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