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55 lines
3.1 KiB
Markdown
55 lines
3.1 KiB
Markdown
<!--
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name: 'Skill: /stuck'
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description: Diagnozse frozen or slow Claude Code sessions
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ccVersion: 2.1.74
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-->
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# /stuck — diagnose frozen/slow Claude Code sessions
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The user thinks another Claude Code session on this machine is frozen, stuck, or very slow. Investigate and post a report to #claude-code-feedback.
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## What to look for
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Scan for other Claude Code processes (excluding the current one — PID is in `process.pid` but for shell commands just exclude the PID you see running this prompt). Process names are typically `claude` (installed) or `cli` (native dev build).
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Signs of a stuck session:
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- **High CPU (≥90%) sustained** — likely an infinite loop. Sample twice, 1-2s apart, to confirm it's not a transient spike.
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- **Process state `D` (uninterruptible sleep)** — often an I/O hang. The `state` column in `ps` output; first character matters (ignore modifiers like `+`, `s`, `<`).
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- **Process state `T` (stopped)** — user probably hit Ctrl+Z by accident.
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- **Process state `Z` (zombie)** — parent isn't reaping.
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- **Very high RSS (≥4GB)** — possible memory leak making the session sluggish.
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- **Stuck child process** — a hung `git`, `node`, or shell subprocess can freeze the parent. Check `pgrep -lP <pid>` for each session.
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## Investigation steps
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1. **List all Claude Code processes** (macOS/Linux):
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```
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ps -axo pid=,pcpu=,rss=,etime=,state=,comm=,command= | grep -E '(claude|cli)' | grep -v grep
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```
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Filter to rows where `comm` is `claude` or (`cli` AND the command path contains "claude").
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2. **For anything suspicious**, gather more context:
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- Child processes: `pgrep -lP <pid>`
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- If high CPU: sample again after 1-2s to confirm it's sustained
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- If a child looks hung (e.g., a git command), note its full command line with `ps -p <child_pid> -o command=`
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- Check the session's debug log if you can infer the session ID: `~/.claude/debug/<session-id>.txt` (the last few hundred lines often show what it was doing before hanging)
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3. **Consider a stack dump** for a truly frozen process (advanced, optional):
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- macOS: `sample <pid> 3` gives a 3-second native stack sample
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- This is big — only grab it if the process is clearly hung and you want to know *why*
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## Report
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Post a summary to **#claude-code-feedback** (channel ID: `C07VBSHV7EV`) using the Slack MCP tool. Use ToolSearch to find `slack_send_message` if it's not already loaded.
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The report should include:
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- Hostname, Claude Code version, how many sessions total, how many look stuck
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- For each flagged session: PID, CPU%, RSS, state, uptime, command line, child processes, and your diagnosis of what's likely wrong
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- If nothing is flagged, still post a brief all-clear with the session count — the user ran /stuck for a reason, so confirming "everything looks fine from the outside" is useful
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If Slack MCP isn't available, format the report as a message the user can copy-paste into #claude-code-feedback.
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## Notes
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- Don't kill or signal any processes — this is diagnostic only.
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- Be brief in the Slack message; details can go in a code block.
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- If the user gave an argument (e.g., a specific PID or symptom), focus there first.
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