Strawbery MCP

🚀 Strawbery-MCP

An MCP (Model Context Protocol) server that provides a tool to count the correct number of R's in "strawberry".

🚀 Quick Start

Strawbery-MCP is an MCP server that offers a tool for counting specific characters in a given string. You can run the server locally or in a container, and integrate it into your OpenCode configuration.

✨ Features

• Case-insensitive character counting: The counting process is not affected by the case of the characters.
• Supports Unicode characters: It can handle Unicode characters, including CJK (Chinese, Japanese, Korean).
• Returns count and 1-indexed positions: Besides the count of the target character, it also provides the 1-indexed positions where the character appears.
• JSON response format: The server responds in JSON format, making it easy to parse.

📦 Installation

Local

go run main.go

Container

docker build -t strawbery-mcp . && docker run -p 3001:3001 strawbery-mcp

Add To OpenCode

Add to the $.mcp block of your opencode.jsonc

{
    "$schema": "https://opencode.ai/config.json",
    "mcp": {
        "strawbery": {
            "type": "remote",
            "url": "http://localhost:3001/sse",
            "enabled": true
        }
    }
}

💻 Usage Examples

Tool: strawberry-count

Parameters

• input (string, required): The string to search in
• character (string, required): The single character to count (must be exactly one Unicode rune)

{
    "character": "r",
    "input": "strawberry"
}

Response

JSON object with:

• count (int): Number of occurrences
• positions (array of int): 1-indexed positions where the character appears

{
    "count": 3,
    "positions": [
        3,
        8,
        9
    ]
}

Examples

• Input: {"input": "strawberry", "character": "r"} → {"count": 3, "positions": [3,6,8]}
• Input: {"input": "你好", "character": "你"} → {"count": 1, "positions": [1]}