graph TD
    Agent["AI Agent / Claude Code / Cursor / IDE"] -->|"MCP JSON-RPC Protocol over Stdio"| Transport["MCP Stdio Transport Layer"]
    Transport --> Server["Clatcher MCP Server Runtime"]
    Server --> Dispatcher{"Tool Dispatcher"}

    Dispatcher -->|"fix_json / cleanup_file"| JsonEngine["JSON Linter & Auto-Fix Engine"]
    Dispatcher -->|"fix_encoding / fix_umlauts"| EncodingEngine["Encoding Normalizer & Mojibake Resolver"]
    Dispatcher -->|"convert_format"| FormatEngine["Format Converter: JSON/YAML/TOML/XML/CSV/INI"]
    Dispatcher -->|"detect_dupes / checksum"| HashEngine["SHA-256 / Multi-Hash Content Engine"]
    Dispatcher -->|"folder_diff / batch_rename"| FileOpsEngine["Folder Diff & Regex Batch Renamer"]
    Dispatcher -->|"archive / zip"| ArchiveEngine["AdmZip Compression Handler"]
    Dispatcher -->|"scan_emoji / regex_test"| RegexEngine["Emoji Scanner & Regex Debugger"]

    JsonEngine --> DryRunGuard{"Dry-Run Guard"}
    EncodingEngine --> DryRunGuard
    FormatEngine --> DryRunGuard
    FileOpsEngine --> DryRunGuard
    ArchiveEngine --> DryRunGuard

    DryRunGuard -->|"dry_run: true (default)"| PreviewReport["Detailed Dry-Run Preview Diff & Status"]
    DryRunGuard -->|"dry_run: false (explicit)"| DiskWrite["Safe Atomic Filesystem Write"]

sequenceDiagram
    autonumber
    actor User as Developer / Agent Orchestrator
    participant Agent as AI Coding Agent (Claude Code / Cursor)
    participant Stdio as MCP Stdio Protocol (JSON-RPC)
    participant Clatcher as Clatcher MCP Server
    participant Validator as Zod Schema Validator
    participant Engine as Dedicated Tool Engine
    participant Guard as Dry-Run Safety Guard
    participant FS as Local Filesystem

    User->>Agent: Prompt: "Fix broken encoding and trailing commas in config.json"
    Agent->>Stdio: CallTool(name="fix_json", args={path: "config.json", dry_run: true})
    Stdio->>Clatcher: Dispatch JSON-RPC Request
    Clatcher->>Validator: Validate arguments (Zod schema)
    Validator-->>Clatcher: Validated inputs

    Clatcher->>Engine: Run JSON repair pipeline
    Engine->>FS: Read target file content (UTF-8)
    FS-->>Engine: Raw file bytes / string
    Engine->>Engine: Strip comments, trailing commas, single quotes, NULs
    Engine->>Guard: Submit repaired AST / string

    alt dry_run == true (Default Mode)
        Guard->>Guard: Generate diff & mutation preview
        Guard-->>Clatcher: Return diff preview without disk write
    else dry_run == false (Explicit Agent Mutation)
        Guard->>FS: Atomic write to target file via temp buffer
        FS-->>Guard: Write successful
        Guard-->>Clatcher: Return success receipt + bytes written
    end

    Clatcher-->>Stdio: JSON-RPC ToolResult (diff, stats, safety report)
    Stdio-->>Agent: Formatted MCP response
    Agent-->>User: Synthesized result & proposed next steps

claude mcp add ellmos-clatcher-mcp -- npx ellmos-clatcher-mcp

{
  "mcpServers": {
    "clatcher": {
      "command": "npx",
      "args": ["-y", "ellmos-clatcher-mcp"]
    }
  }
}

npm install -g ellmos-clatcher-mcp
claude mcp add ellmos-clatcher-mcp -- ellmos-clatcher

git clone https://github.com/ellmos-ai/ellmos-clatcher-mcp.git
cd ellmos-clatcher-mcp
npm install
npm run build
node dist/index.js

npm test