Parse $ARGUMENTS to determine mode:

<mode_list> If no arguments or $ARGUMENTS is empty:

List all threads:

ls .planning/threads/*.md 2>/dev/null

For each thread, read the first few lines to show title and status:

## Active Threads

| Thread | Status | Last Updated |
|--------|--------|-------------|
| fix-deploy-key-auth | OPEN | 2026-03-15 |
| pasta-tcp-timeout | RESOLVED | 2026-03-12 |
| perf-investigation | IN PROGRESS | 2026-03-17 |

If no threads exist, show:

No threads found. Create one with: /gsd-thread <description>

</mode_list>

<mode_resume> If $ARGUMENTS matches an existing thread name (file exists):

Resume the thread — load its context into the current session:

cat ".planning/threads/${THREAD_NAME}.md"

Display the thread content and ask what the user wants to work on next. Update the thread's status to IN PROGRESS if it was OPEN. </mode_resume>

<mode_create> If $ARGUMENTS is a new description (no matching thread file):

Create a new thread:

1. Generate slug from description:

   SLUG=$(node "$HOME/.claude/get-shit-done/bin/gsd-tools.cjs" generate-slug "$ARGUMENTS" --raw)

2. Create the threads directory if needed:

   mkdir -p .planning/threads

3. Write the thread file:

   cat > ".planning/threads/${SLUG}.md" << 'EOF'
   # Thread: {description}
   
   ## Status: OPEN
   
   ## Goal
   
   {description}
   
   ## Context
   
   *Created from conversation on {today's date}.*
   
   ## References
   
   - *(add links, file paths, or issue numbers)*
   
   ## Next Steps
   
   - *(what the next session should do first)*
   EOF

4. If there's relevant context in the current conversation (code snippets, error messages, investigation results), extract and add it to the Context section.

5. Commit:

   node "$HOME/.claude/get-shit-done/bin/gsd-tools.cjs" commit "docs: create thread — ${ARGUMENTS}" --files ".planning/threads/${SLUG}.md"

6. Report:

   ## 🧵 Thread Created
   
   Thread: {slug}
   File: .planning/threads/{slug}.md
   
   Resume anytime with: /gsd-thread {slug}

</mode_create>