Format-aware structural diff for JSON, YAML, TOML, XML, and HTML via diff-mcp (npm, stdio) — with RFC 6902 jsonpatch output

{
  "server": "diff-mcp",
  "version": "0.0.5 (reports 0.0.1)",
  "transport": "stdio",
  "install": "npm install diff-mcp",
  "entry": "node build/index.js (bin: diff-mcp)",
  "tools_count": 1,
  "resources_count": 0,
  "calls": 9,
  "success_rate": "100%",
  "p50_ms": 1,
  "first_call_ms": 1,
  "init_ms": 125,
  "input_formats": ["text", "json", "json5", "yaml", "toml", "xml", "html"],
  "output_formats": ["text", "json", "jsonpatch"],
  "handshake": {
    "initialize": {
      "request": {
        "jsonrpc": "2.0",
        "id": 1,
        "method": "initialize",
        "params": {
          "protocolVersion": "2024-11-05",
          "capabilities": {},
          "clientInfo": {
            "name": "pathfinder",
            "version": "1.0"
          }
        }
      },
      "response": {
        "jsonrpc": "2.0",
        "id": 1,
        "result": {
          "protocolVersion": "2024-11-05",
          "capabilities": {
            "tools": {
              "listChanged": false
            }
          },
          "serverInfo": {
            "name": "diff-mcp",
            "version": "0.0.1"
          }
        }
      }
    },
    "tools_list": {
      "tool_count": 1,
      "tools": ["diff"]
    }
  },
  "tested_tools": [
    {
      "tool": "diff",
      "test": "text diff",
      "args": {
        "left": "Hello World\nThis is a test\nLine three",
        "right": "Hello World\nThis is a modified test\nLine three\nLine four added",
        "leftFormat": "text",
        "rightFormat": "text"
      },
      "success": true,
      "latency_ms": 1,
      "result_excerpt": "Full string diff with character-level indicators"
    },
    {
      "tool": "diff",
      "test": "JSON structural diff (text output)",
      "args": {
        "left": "{"name":"Alice","age":30,"tags":["a","b","c"]}",
        "right": "{"name":"Alice","age":31,"tags":["a","c","d"],"email":"[email protected]"}",
        "leftFormat": "json",
        "rightFormat": "json",
        "outputFormat": "text"
      },
      "success": true,
      "latency_ms": 0,
      "result_excerpt": "age: 30 => 31, tags: -b +d, +email"
    },
    {
      "tool": "diff",
      "test": "JSON diff (RFC 6902 jsonpatch)",
      "args": {
        "left": "{"host":"db.prod","port":5432,"ssl":true}",
        "right": "{"host":"db.staging","port":5433,"ssl":false,"pool":10}",
        "leftFormat": "json",
        "rightFormat": "json",
        "outputFormat": "jsonpatch"
      },
      "success": true,
      "latency_ms": 0,
      "result_excerpt": "[{op:replace,path:/host,value:db.staging},{op:replace,path:/port,value:5433},{op:replace,path:/ssl,value:false},{op:add,path:/pool,value:10}]"
    },
    {
      "tool": "diff",
      "test": "YAML diff (K8s Service)",
      "args": {
        "leftFormat": "yaml",
        "rightFormat": "yaml"
      },
      "success": true,
      "latency_ms": 2,
      "result_excerpt": "type: ClusterIP => LoadBalancer, port: 80 => 443, +labels.app:web"
    },
    {
      "tool": "diff",
      "test": "TOML diff",
      "args": {
        "leftFormat": "toml",
        "rightFormat": "toml"
      },
      "success": true,
      "latency_ms": 1,
      "result_excerpt": "host: localhost => prod.db.com, port: 8080 => 3000, debug: true => false, +pool_size:20"
    },
    {
      "tool": "diff",
      "test": "XML diff",
      "args": {
        "leftFormat": "xml",
        "rightFormat": "xml"
      },
      "success": true,
      "latency_ms": 1,
      "result_excerpt": "@_host: localhost => prod.db, @_ttl: 300 => 600, +@_ssl:true, +log element"
    },
    {
      "tool": "diff",
      "test": "cross-format JSON vs YAML",
      "args": {
        "leftFormat": "json",
        "rightFormat": "yaml"
      },
      "success": true,
      "latency_ms": 0,
      "result_excerpt": "replicas: 3 => 5, image: nginx:1.21 => nginx:1.25, +healthCheck:true"
    },
    {
      "tool": "diff",
      "test": "JSON compact delta output",
      "args": {
        "outputFormat": "json"
      },
      "success": true,
      "latency_ms": 1,
      "result_excerpt": "jsondiffpatch delta format with array markers"
    },
    {
      "tool": "diff",
      "test": "identical inputs (no diff)",
      "args": {
        "left": "{"same":true}",
        "right": "{"same":true}"
      },
      "success": true,
      "latency_ms": 0,
      "result_excerpt": "Empty diff — legend header only"
    }
  ]
}