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scratch-unified-mcp

scratch-unified-mcp

by blessed0x
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Local

Sb3 Git Unpack

sb3_git_unpack

Convert an .sb3 Scratch project into a diffable folder containing project.json and assets, enabling version control and comparison of project changes.

Instructions

Unpack an .sb3 into a diffable directory (project.json + assets/).

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": {
      "sb3_path": "<sb3_path>",
      "out_dir": "<out_dir>"
    },
    "name": "sb3_git_unpack"
  }
}

Input Schema

NameRequiredDescriptionDefault
out_dirYes
sb3_pathYes

Output Schema

NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

A3.5/5.0
Behavior3/5

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

With no annotations, the description carries the behavioral burden. It does disclose that the tool creates a directory containing project.json and assets/, which is meaningful output behavior. It does not mention whether out_dir must already exist, whether it is created or overwritten, or what happens on invalid input.

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, well-structured sentence with no filler. The key operation and output format are placed right in the main clause, and every word contributes to understanding.

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 simple two-parameter tool with an output schema, the description gives the core purpose and expected output layout. However, the complete absence of annotations and parameter descriptions leaves important invocation details unaddressed, such as directory creation/overwrite behavior and path semantics.

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%, but the two parameter names are self-explanatory and the sentence 'Unpack an .sb3 into a diffable directory' establishes sb3_path as the input and out_dir as the output. The description adds some semantic context beyond the bare schema, but it does not explain path requirements, format expectations, or whether out_dir will be created.

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 ('Unpack'), a clear resource ('.sb3'), and the output form ('diffable directory (project.json + assets/)'). It is easy to distinguish from the sibling sb3_git_pack and sb3_git_diff by meaning, though it does not explicitly name or contrast any sibling.

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 phrase 'into a diffable directory' implies the tool is for preparing an .sb3 for version-control or diff workflows, which gives some usage context. However, it never states when to prefer this over sb3_git_pack, sb3_git_diff, or related project tools, and gives no exclusions or prerequisites.

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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