Leak Canary

A standalone Kotlin/JVM MCP server that automates Android memory leak detection using LeakCanary and adb logcat. It parses leak traces, classifies root causes, assigns priority levels, suggests fixes, and tracks leak history across sessions -- all exposed as MCP tools for use in Cursor, VS Code, and Android Studio.

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Prerequisites

• Java 17+ installed and available on PATH
• adb installed (Android SDK Platform-Tools) -- the server auto-detects adb from ANDROID_HOME, ANDROID_SDK_ROOT, or common SDK install locations
• An Android device or emulator connected via USB/WiFi with LeakCanary integrated in the debug build

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Repository Link: https://github.com/ravisharma46/Leak-Canary-Mcp-Server.git

Quick Install (Recommended)

The fastest and most universally compatible way to use the MCP server across Windows, macOS, and Linux. It requires zero path configuration.

Add this directly to your ~/.cursor/mcp.json:

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

Restart Cursor and the 12 tools will appear in the MCP tools panel.

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Setup in VS Code

Make sure you have GitHub Copilot extension installed with Agent mode enabled (VS Code 1.99+).

Option A — Workspace level (.vscode/mcp.json in your project root):

{
  "servers": {
    "leakcanary": {
      "type": "stdio",
      "command": "npx",
      "args": ["-y", "leakcanary-mcp"]
    }
  }
}

Option B — User level (VS Code settings.json):

{
  "mcp": {
    "servers": {
      "leakcanary": {
        "type": "stdio",
        "command": "npx",
        "args": ["-y", "leakcanary-mcp"]
      }
    }
  }
}

Open Copilot Chat → Agent mode and the LeakCanary tools will be available.

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Setup in Android Studio

Android Studio supports MCP servers through the Gemini plugin (Android Studio Meerkat 2024.3+ or later).

1. Open Settings → Tools → AI Assistant → MCP Servers
2. Click + Add and configure:

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

Alternatively, add a mcp.json file in the .idea folder of your project:

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

Restart Android Studio and the tools will appear under Gemini → MCP Tools.

Note: All setups use npx to dynamically execute the wrapper. The wrapper auto-downloads and updates the server JAR for you on each run.

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Database-First Data Strategy

The server reads leak data directly from the app's LeakCanary SQLite database as the primary source, not from adb logcat. This means leak data is always available -- even after reboots, logcat buffer clears, or the next day.

How it works

1. Primary: App Database (BLOB deserialization) -- Pulls the app's leaks.db to the host and deserializes the HeapAnalysisSuccess Java objects stored as BLOBs using the shark library. This provides the full analysis -- complete reference chains, retained sizes, leak status per node, GC roots, heap metadata, and device info. Identical quality to what you see in the LeakCanary app.
2. Fallback: Logcat -- If the database isn't accessible (app not debuggable, not installed, etc.), falls back to reading adb logcat -s LeakCanary.
3. Auto-Discovery -- When no package_name is provided, the server automatically scans all installed apps on the device to find ones with a LeakCanary database. If multiple apps are found, it prompts you to choose. If only one app is found, it reads leaks directly.

This means you can just say "list all leaks" without knowing any package names -- the server will find your LeakCanary-enabled apps and show you what's available.

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MCP Tools (12 total)

Leak Detection & Analysis

Tool	Description
detect_leaks	Capture LeakCanary logs, parse all leak traces, classify/prioritize, and return a full structured report. Falls back to app storage when logcat is empty.
list_leaks	List all detected leaks in a deduplicated compact summary with occurrence counts. Falls back to app storage when logcat is empty.
search_leak	Search for leaks by class name or keyword (e.g. "SearchHistoryManager"). Falls back to app storage when logcat is empty.
analyze_leak	Deep-dive a specific leak by its signature hash -- full reference chain, root cause, severity. Falls back to app storage when logcat is empty.
suggest_fixes	Generate actionable fix steps for a leak based on its pattern (singleton, listener, context, etc.). Falls back to app storage when logcat is empty.

Memory & Device Info

Tool	Description
get_heap_summary	Extract heap-level statistics (class count, instance count, heap size, bitmap stats, device info)
get_device_memory	Get live memory stats for an app (PSS, Java Heap, Native Heap, Code, Stack, Graphics) via dumpsys meminfo
list_devices	List all connected Android devices and emulators with their connection state

History, Diff & Reporting

Tool	Description
get_leak_history	Query persisted leak records across sessions with optional filters (signature, date, limit)
leak_diff	Compare current leaks against previous scans -- shows NEW, RECURRING, and RESOLVED leaks
export_report	Generate a shareable Markdown leak report with priority summary, reference chains, and history
clear_leaks	Clear the logcat buffer so the next scan only shows newly detected leaks

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Usage Examples

Once the MCP server is active, you can ask the AI agent in natural language:

• "Detect memory leaks on my connected device" -- runs detect_leaks, returns a full prioritized report
• "List all memory leaks" -- runs list_leaks, returns a deduplicated summary with occurrence counts
• "Check memory leak in SearchHistoryManager" -- runs search_leak, filters leaks matching the class name
• "Show me the heap summary" -- runs get_heap_summary, returns heap stats
• "How much memory is my app using?" -- runs get_device_memory, returns live PSS/heap stats
• "Analyze the leak with signature 42ac34ed..." -- runs analyze_leak, returns a deep-dive of that specific leak
• "How do I fix the leak with signature 48c887..." -- runs suggest_fixes, returns actionable fix steps
• "Show me leak history from the last week" -- runs get_leak_history with a date filter
• "What leaks are new since last scan?" -- runs leak_diff, shows new/recurring/resolved leaks
• "Export a leak report" -- runs export_report, generates a Markdown file for sharing
• "Clear leaks and start fresh" -- runs clear_leaks, resets the logcat buffer
• "What devices are connected?" -- runs list_devices, shows all adb devices

Auto-discovery & multi-app support

When you ask for leaks without specifying an app, the server automatically discovers all debuggable apps on the device that have a LeakCanary database:

No LeakCanary output found in logcat, but I found apps with LeakCanary
databases on the device.

Please specify which app to analyze by providing the 'package_name' parameter:
  1. com.myapp.debug (15 leaks)
  2. com.otherapp.debug (2 leaks)
  3. com.myapp.man.preprod (2 leaks)

Example: use package_name="com.myapp.debug" to see its leaks.

You can then specify the app:

• "List leaks for com.myapp.debug" -- reads stored leaks from that app's database
• "Detect leaks for com.otherapp.debug" -- analyzes leaks for the other app

If only one app has LeakCanary on the device, the server skips the prompt and shows leaks directly -- no extra parameters needed.

Persistent leak reading

The logcat buffer clears over time (reboot, buffer rotation, next day). The server handles this transparently:

• With package_name: Reads leaks directly from the app's LeakCanary SQLite database
• Without package_name: Auto-discovers apps with LeakCanary and prompts you to choose

The database is pulled to the host and queried locally with sqlite3, so it works even on devices that don't have sqlite3 installed. Requires the app to be a debug build (for run-as access).

Multi-device support

If you have multiple devices connected, pass the device_id parameter:

• "Detect leaks on device emulator-5554" -- the tool will use adb -s emulator-5554
• "What devices are connected?" -- runs list_devices to see all available device IDs

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Tech Stack

Component	Technology
Language	Kotlin 2.2 / JVM 17
MCP SDK	io.modelcontextprotocol:kotlin-sdk:0.8.3
Leak Analysis	shark:2.14 (LeakCanary's heap analysis library)
Serialization	kotlinx-serialization-json
Transport	STDIO (stdin/stdout JSON-RPC)
Build	Gradle Kotlin DSL + Shadow plugin (fat JAR)
History storage	Local JSON file (~/.leakcanary-mcp/history.json)
Report export	Markdown files (~/.leakcanary-mcp/reports/)

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License

This project is for internal use at Todo App.

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Author

Developed by Ravi Kumar

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