Kotlin & Java Library Sources

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Read the real sources, public API and KDoc of any Maven-published Kotlin or Java library from its sources jar.

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docker run -i --rm ghcr.io/aoreshkov/kotlin-lib-mcp:0.7.0

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mcp.tc/i/kotlin-java-library-sources

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Downloads the sources jar of a Maven or Gradle-published Kotlin or Java library, parses it with the Kotlin Analysis API, and returns type-resolved public API signatures, KDoc, dependencies, raw source and source search. Kotlin Multiplatform libraries are resolved per target. Results are cached on disk by group, artifact and version.

Runs locally over stdio from a Docker image (ghcr.io/aoreshkov/kotlin-lib-mcp) or from a release zip that needs Java 21 or newer. An HTTP transport is available and binds to loopback by default. No API key or sign-in is needed; Maven Central is the default repository.

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  • Fetch and cache a library's sources by group, artifact and version
  • List packages and declarations of a library
  • Get type-resolved API signatures
  • Read KDoc for a declaration
  • Read raw source and search it
  • Diff two versions of a library
  • List dependencies, versions and the latest version

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  • Fetch io.ktor:ktor-client-core:3.5.1 and list its public packages.

  • Show the API signature and KDoc for HttpClient in Ktor 3.5.1.

  • What changed in the public API between these two versions of this library?

  • What is the latest version of kotlinx-coroutines-core?

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Claude Code

  1. Run this in a terminal, in your project folder:
claude mcp add --transport stdio kotlin-java-library-sources -- docker run -i --rm ghcr.io/aoreshkov/kotlin-lib-mcp:0.7.0
  1. Start Claude Code and type /mcp. kotlin-java-library-sources should show as connected.

Add --scope user to make it available in every project.

Claude Desktop

  1. Open Settings → Developer → Edit Config. It opens claude_desktop_config.json. Add:
claude_desktop_config.json
{
  "mcpServers": {
    "kotlin-java-library-sources": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "ghcr.io/aoreshkov/kotlin-lib-mcp:0.7.0"
      ]
    }
  }
}
  1. Save the file and restart Claude Desktop.

Needs Docker on your computer. The file lives in ~/Library/Application Support/Claude/ on macOS and %APPDATA%\Claude\ on Windows.

Cursor

Add to Cursor a11y.new_tab

Or add it by hand to ~/.cursor/mcp.json (all projects) or .cursor/mcp.json (this project):

mcp.json
{
  "mcpServers": {
    "kotlin-java-library-sources": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "ghcr.io/aoreshkov/kotlin-lib-mcp:0.7.0"
      ]
    }
  }
}

Needs Docker on your computer.

VS Code

Install in VS Code a11y.new_tab

Or from a terminal:

code --add-mcp '{"name":"kotlin-java-library-sources","type":"stdio","command":"docker","args":["run","-i","--rm","ghcr.io/aoreshkov/kotlin-lib-mcp:0.7.0"]}'

Or commit it to the repo in .vscode/mcp.json:

.vscode/mcp.json
{
  "servers": {
    "kotlin-java-library-sources": {
      "type": "stdio",
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "ghcr.io/aoreshkov/kotlin-lib-mcp:0.7.0"
      ]
    }
  }
}

Needs Docker on your computer.

Devin Desktop

  1. Add it to ~/.config/devin/mcp_config.json (macOS and Linux) or %APPDATA%\devin\mcp_config.json (Windows):
mcp_config.json
{
  "mcpServers": {
    "kotlin-java-library-sources": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "ghcr.io/aoreshkov/kotlin-lib-mcp:0.7.0"
      ]
    }
  }
}
  1. Refresh the MCP server list in Cascade.

Devin Desktop is the new name for Windsurf.

Codex

codex mcp add kotlin-java-library-sources -- docker run -i --rm ghcr.io/aoreshkov/kotlin-lib-mcp:0.7.0

Or edit ~/.codex/config.toml directly:

config.toml
[mcp_servers.kotlin-java-library-sources]
command = "docker"
args = ["run", "-i", "--rm", "ghcr.io/aoreshkov/kotlin-lib-mcp:0.7.0"]

Needs Docker on your computer.

Gemini CLI

gemini mcp add kotlin-java-library-sources docker -- run -i --rm ghcr.io/aoreshkov/kotlin-lib-mcp:0.7.0

This adds it to the current project. Add -s user to use it everywhere.

Any client

Most clients that start local servers accept this shape:

{
  "mcpServers": {
    "kotlin-java-library-sources": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "ghcr.io/aoreshkov/kotlin-lib-mcp:0.7.0"
      ]
    }
  }
}

Zed puts servers under context_servers in its settings, with the same command, args and env fields.

Needs Docker on your computer.

listing.faq

Can I paste mcp.tc/i/kotlin-java-library-sources into my MCP client?

No. Kotlin & Java Library Sources runs on your own computer, started by your client, so it has no web address to connect to. The quick link is the page to share; the install command is docker run -i --rm ghcr.io/aoreshkov/kotlin-lib-mcp:0.7.0.

Does Kotlin & Java Library Sources need an API key?

No. It doesn't declare any keys or environment variables. It runs with your user account's permissions, so check what its tools can reach.

Is Kotlin & Java Library Sources a remote or a local server?

Local. Your client starts it as a process on your computer with docker run -i --rm ghcr.io/aoreshkov/kotlin-lib-mcp:0.7.0, which needs Docker.

What can Kotlin & Java Library Sources do?

You can fetch and cache a library's sources by group, artifact and version, list packages and declarations of a library and get type-resolved API signatures.

Which clients can use it?

Any client that starts local servers: Claude Code, Claude Desktop, Cursor, VS Code, Devin Desktop, Codex, Gemini CLI, Zed and others. claude.ai and ChatGPT only connect to remote servers.

Who wrote this page?

mcp.tc's robot read Kotlin & Java Library Sources's public metadata (its package and repository pages), and an AI model drafted the text from it. A person reviews anything the checks can't confirm. The text can still be wrong, so if you spot a mistake, use Report this listing on this page.

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