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Memory Leak Debugger for Qwen Code

Guides an agent to capture and compare heap snapshots to find memory leaks in the Qwen Code CLI

Source Download skill
Repository
QwenLM/qwen-code
Stars
28,880
Licence
Apache-2.0
Files
3 files

What it does

When installed, the agent follows a step-by-step method for finding memory leaks in the Qwen Code command-line tool. It starts the tool in a tmux terminal session, sends a signal to save memory snapshots at several points, and uses the chrome-devtools command-line tool to compare which object types grow over time and what keeps them alive. It then suggests likely root causes and how to verify a fix.

Great for

  • Contributors to the Qwen Code CLI who suspect high or growing memory use
  • Engineers who want a repeatable heap-snapshot workflow for a Node.js CLI

Skip it if

  • Users of Qwen Code who only want to use the tool; this is a maintainer workflow for the repository's source code
  • Debugging memory issues in unrelated Node.js apps, since paths, commands and the worked example are specific to this repo (the general technique could be adapted with effort)

Try asking

  • “Our Qwen Code CLI memory keeps climbing during long sessions, can you find the leak?”
  • “Take heap snapshots while I use the CLI and tell me which classes are growing”
  • “Trace the retainer chain for PerformanceMeasure objects in the CLI”
Step-by-step guide: how to use Memory Leak Debugger for Qwen CodeInstall, first run, examples, tips and FAQs

Install in 3 steps

  1. 1

    Download the skill

    The ZIP contains the 3 original files, the Apache-2.0 licence and an attribution note.

    memory-leak-debug.zip
  2. 2

    Add it to your agent

    Claude Code (all projects)

    mkdir -p ~/.claude/skills && unzip memory-leak-debug.zip -d ~/.claude/skills/

    Claude Code / Agent SDK (this project only)

    mkdir -p .claude/skills && unzip memory-leak-debug.zip -d .claude/skills/

    Claude apps (web/desktop): Settings → Capabilities → Skills → Upload skill, and choose the ZIP.

  3. 3

    Ask for the task

    No special command needed — the agent reads the skill's description and loads it when your request matches. Try one of the prompts above.

Get better results

  • Review the commands before running them; the skill starts a dev server, sends kill -USR2 signals to a process, and can delete *.heapsnapshot files in the working directory
  • Take at least three snapshots under the same workload so the growth trend is clear
  • Keep the snapshot files out of version control, as they can be large and may contain sensitive in-memory data

What's inside

  • examples/react-reconciler-performance-measure-leak.md
  • scripts/find-leaf-node.sh
  • SKILL.md

Redistributed unmodified from QwenLM/qwen-code under the Apache-2.0 licence. The assessment was drafted with AI from the skill's files on 2026-10-29. Skills can instruct your agent to run code — read SKILL.md and any scripts before installing.