Gradle-accurate JVM classpath; fetch Java source, signatures, and class structure for agents.
To add JVM Source Lens to Claude, run the install command below or copy the ready-made config for Claude Code, Claude Desktop, Cursor and VS Code further down. Restart your client after adding it and its tools show up in your next conversation. It declares 6 environment variables, listed below.
Install
npx -y jvmsrc@1.16.0Environment variables
JVMSRC_ALLOWED_ROOTSSet in your MCP configJVMSRC_CACHE_ROOTSet in your MCP configJVMSRC_LOG_DIRSet in your MCP configJVMSRC_MAX_SOURCE_OUTPUT_CHARSSet in your MCP configJVMSRC_GRADLE_TIMEOUT_MSSet in your MCP configJVMSRC_CFR_PATHSet in your MCP configSet only if the maker requires them; this listing does not flag any of them as required.
Install with your client
claude mcp add jvm-source-lens --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@1.16.0
Run this in a terminal to add the server to Claude Code.
What this does
JVM Source Lens exposes a set of tools to Claude over the Model Context Protocol. After you add it to claude_desktop_config.json (snippet above) and restart Claude Desktop, those tools become callable inside any conversation.
Requirements
This server declares the following environment variables. Set only the ones the maker requires for your setup; this listing does not flag any of them as required:
JVMSRC_ALLOWED_ROOTS JVMSRC_CACHE_ROOT JVMSRC_LOG_DIR JVMSRC_MAX_SOURCE_OUTPUT_CHARS JVMSRC_GRADLE_TIMEOUT_MS JVMSRC_CFR_PATH
Set these via the env object in your MCP config (see claude_desktop_config.json snippet above).
Frequently asked questions
How do I install JVM Source Lens?
Run the Claude Code command in the install section to add JVM Source Lens to Claude Code, or copy the ready-made config for your client from the install section on this page. Restart your client afterwards and the tools appear in your next conversation.
Which clients work with JVM Source Lens?
This page carries setup and config for Claude Code, Claude Desktop, Cursor and VS Code. Any other MCP client that accepts a standard server config can connect to JVM Source Lens as well.
Does JVM Source Lens need an API key?
This listing does not flag an API key as required. The server can use these environment variables: JVMSRC_ALLOWED_ROOTS, JVMSRC_CACHE_ROOT, JVMSRC_LOG_DIR, JVMSRC_MAX_SOURCE_OUTPUT_CHARS, JVMSRC_GRADLE_TIMEOUT_MS, JVMSRC_CFR_PATH; the maker's docs say which of them your setup needs. They go in the env block of your MCP config.
Imported from the Official MCP Registry. The details above come from the registry entry; the maker can claim this listing to correct them, add docs, and see its traffic.
Is this your MCP server?
Claim this listing to see its traffic, fix details yourself, and skip the review queue on future updates.
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