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implement_blueprint_interface

Adds a Blueprint Interface to a Blueprint asset, enabling it to implement the interface's functions and events.

Instructions

Make a Blueprint implement a Blueprint Interface.

Args: blueprint_name: Blueprint that will implement the interface interface_name: Interface asset name

KB: see knowledge_base/02_BLUEPRINT_COMMUNICATION.md#overview Example: implement_blueprint_interface(blueprint_name="/Game/MCP_Test/BP_Example", interface_name="ExampleName")

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
blueprint_nameYes
interface_nameYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

B3.2/5.0
Behavior2/5

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

No annotations are provided, so the description carries the full burden. It states the action but doesn't disclose side effects (e.g., whether this modifies the Blueprint asset permanently, whether it requires compilation, whether it can be undone, or what happens if the interface is already implemented). The KB reference is a pointer but not a disclosure.

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 compact: a one-line summary, parameter explanations, a KB reference, and an example. The example is valuable and front-loaded enough. The KB reference is a bit cryptic but doesn't waste space.

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 2-parameter tool with no annotations and no output schema details, the description is adequate but not complete. It gives the essential inputs and an example, but lacks behavioral context (side effects, prerequisites, error conditions) and doesn't describe the return value. The KB reference helps but is not a substitute for inline guidance.

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 description coverage is 0%, so the description must compensate. It does provide one-line explanations for both parameters ('Blueprint that will implement the interface' and 'Interface asset name'), which adds meaning beyond the bare schema titles. However, it doesn't specify path formats (e.g., /Game/... prefix) beyond the example, and doesn't clarify whether the interface_name is a full asset path or just a name.

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 states a specific verb ('Make a Blueprint implement') and a specific resource ('a Blueprint Interface'), which clearly distinguishes it from sibling tools like create_blueprint_interface or add_interface_function_node. It could be slightly more explicit about the relationship to the interface asset, but the core purpose is clear.

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 usage context: it's for making an existing Blueprint implement an interface, and the KB reference points to more detailed guidance. However, it doesn't explicitly state when to use this tool versus alternatives like create_blueprint_interface or add_interface_function_node, nor does it mention prerequisites (e.g., the interface must already exist).

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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