Loading ToolBench
A developer-friendly MCP (Model Context Protocol) framework for Dart that provides annotations and code generation to build MCP servers by annotating methods with @MCPTool, @MCPResource, or @MCPPrompt
This is a Dart MCP framework with 8 example calculator/greeting tools. All tools have basic schemas and descriptions present, but quality is inconsistent. Tool names are good (verb-based: add, subtract, multiply, divide, power, sqrt, factorial, greet). Descriptions are minimal (10-50 chars), meeting the floor but not the ideal 50-200 char range. Schemas are present with proper JSON Schema structure and required fields, but parameter descriptions are terse ('A parameter', 'B parameter', 'Number parameter'). No output schemas are documented. Error handling is not evident from the code. The framework itself (MCPServer base class) is well-structured with proper handler registration and protocol support, but the example tools are simplistic and don't showcase production patterns. This is a framework demo, not a production-grade server, which explains the baseline scores.
Add two numbers
Divide two numbers
Calculate factorial of a number
Greet someone by name
Multiply two numbers
Raise a number to a power
Calculate square root of a number
Subtract two numbers
Parameter descriptions are generic placeholders ('A parameter', 'B parameter', 'Number parameter') instead of explaining what each controls or constraining values. This violates the tool-description pattern and forces LLMs to infer meaning from names alone.
No output schemas documented. LLMs cannot know what fields or types are returned, limiting their ability to chain these tools or extract specific results. Tool definitions lack return type documentation.
Descriptions are extremely minimal (10-50 chars, e.g., 'Add two numbers', 'Subtract two numbers'). Baseline production tools average 194 chars. These lack context on when to use each tool, dependencies, or edge cases (e.g., divide by zero handling).
Inferred effective spec: <=2025-11-25.
| Scored | Grade | Overall | Spec posture | Rubric |
|---|---|---|---|---|
| 2026-09-22 | D | 54 | <=2025-11-25 | v2 |
No error handling or recovery guidance visible. Divide by zero, negative sqrt, or invalid factorial inputs are not documented. LLMs have no guidance on what to do if a call fails.
Tool names lack specificity for complex operations. 'power' could mean exponentiation, authorization, or status. Baseline production tools are verb_noun (e.g., 'exponentiate_number') for clarity.