JVM Source Lens MCP Server

Name: JVM Source Lens MCP Server
Author: io.github.Sintexer

io.github.Sintexer/jvmsrc

Repository Registry

What is the JVM Source Lens MCP server?

Gradle-accurate JVM classpath; fetch Java source, signatures, and class structure for agents.

How to install JVM Source Lens

Copy-paste configuration for popular MCP clients.

transport: stdio

Config generated by PluginBench — verify against the source before use.

Environment / auth

JVMSRC_ALLOWED_ROOTS
Optional comma-separated absolute paths; only these project roots are allowed.
JVMSRC_CACHE_ROOT
Optional absolute path for resolution and decompile caches (default: OS cache dir).
JVMSRC_LOG_DIR
Optional absolute path for failure diagnostic logs.
JVMSRC_MAX_SOURCE_OUTPUT_CHARS
Max characters returned for full-file source (default 524288).
JVMSRC_GRADLE_TIMEOUT_MS
Gradle resolution subprocess timeout in milliseconds.
JVMSRC_CFR_PATH
Optional path to a custom CFR JAR for decompilation.

Claude Desktop

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "jvmsrc": {
      "command": "npx",
      "args": [
        "-y",
        "jvmsrc",
        "-y",
        "mcp"
      ],
      "env": {
        "JVMSRC_ALLOWED_ROOTS": "<YOUR_JVMSRC_ALLOWED_ROOTS>",
        "JVMSRC_CACHE_ROOT": "<YOUR_JVMSRC_CACHE_ROOT>",
        "JVMSRC_LOG_DIR": "<YOUR_JVMSRC_LOG_DIR>",
        "JVMSRC_MAX_SOURCE_OUTPUT_CHARS": "<YOUR_JVMSRC_MAX_SOURCE_OUTPUT_CHARS>",
        "JVMSRC_GRADLE_TIMEOUT_MS": "<YOUR_JVMSRC_GRADLE_TIMEOUT_MS>",
        "JVMSRC_CFR_PATH": "<YOUR_JVMSRC_CFR_PATH>"
      }
    }
  }
}

Cursor

~/.cursor/mcp.json

{
  "mcpServers": {
    "jvmsrc": {
      "command": "npx",
      "args": [
        "-y",
        "jvmsrc",
        "-y",
        "mcp"
      ],
      "env": {
        "JVMSRC_ALLOWED_ROOTS": "<YOUR_JVMSRC_ALLOWED_ROOTS>",
        "JVMSRC_CACHE_ROOT": "<YOUR_JVMSRC_CACHE_ROOT>",
        "JVMSRC_LOG_DIR": "<YOUR_JVMSRC_LOG_DIR>",
        "JVMSRC_MAX_SOURCE_OUTPUT_CHARS": "<YOUR_JVMSRC_MAX_SOURCE_OUTPUT_CHARS>",
        "JVMSRC_GRADLE_TIMEOUT_MS": "<YOUR_JVMSRC_GRADLE_TIMEOUT_MS>",
        "JVMSRC_CFR_PATH": "<YOUR_JVMSRC_CFR_PATH>"
      }
    }
  }
}

Windsurf

~/.codeium/windsurf/mcp_config.json

{
  "mcpServers": {
    "jvmsrc": {
      "command": "npx",
      "args": [
        "-y",
        "jvmsrc",
        "-y",
        "mcp"
      ],
      "env": {
        "JVMSRC_ALLOWED_ROOTS": "<YOUR_JVMSRC_ALLOWED_ROOTS>",
        "JVMSRC_CACHE_ROOT": "<YOUR_JVMSRC_CACHE_ROOT>",
        "JVMSRC_LOG_DIR": "<YOUR_JVMSRC_LOG_DIR>",
        "JVMSRC_MAX_SOURCE_OUTPUT_CHARS": "<YOUR_JVMSRC_MAX_SOURCE_OUTPUT_CHARS>",
        "JVMSRC_GRADLE_TIMEOUT_MS": "<YOUR_JVMSRC_GRADLE_TIMEOUT_MS>",
        "JVMSRC_CFR_PATH": "<YOUR_JVMSRC_CFR_PATH>"
      }
    }
  }
}

VS Code

.vscode/mcp.json

{
  "servers": {
    "jvmsrc": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "jvmsrc",
        "-y",
        "mcp"
      ],
      "env": {
        "JVMSRC_ALLOWED_ROOTS": "<YOUR_JVMSRC_ALLOWED_ROOTS>",
        "JVMSRC_CACHE_ROOT": "<YOUR_JVMSRC_CACHE_ROOT>",
        "JVMSRC_LOG_DIR": "<YOUR_JVMSRC_LOG_DIR>",
        "JVMSRC_MAX_SOURCE_OUTPUT_CHARS": "<YOUR_JVMSRC_MAX_SOURCE_OUTPUT_CHARS>",
        "JVMSRC_GRADLE_TIMEOUT_MS": "<YOUR_JVMSRC_GRADLE_TIMEOUT_MS>",
        "JVMSRC_CFR_PATH": "<YOUR_JVMSRC_CFR_PATH>"
      }
    }
  }
}

Claude Code

claude mcp add jvmsrc --env JVMSRC_ALLOWED_ROOTS=<YOUR_JVMSRC_ALLOWED_ROOTS> --env JVMSRC_CACHE_ROOT=<YOUR_JVMSRC_CACHE_ROOT> --env JVMSRC_LOG_DIR=<YOUR_JVMSRC_LOG_DIR> --env JVMSRC_MAX_SOURCE_OUTPUT_CHARS=<YOUR_JVMSRC_MAX_SOURCE_OUTPUT_CHARS> --env JVMSRC_GRADLE_TIMEOUT_MS=<YOUR_JVMSRC_GRADLE_TIMEOUT_MS> --env JVMSRC_CFR_PATH=<YOUR_JVMSRC_CFR_PATH> -- npx -y jvmsrc -y mcp