# Check if a plugin is installed
nvim --headless -c "lua print(pcall(require, 'PLUGIN_NAME'))" -c "qa" 2>&1
# true = installed, false = not found

# Get a config value
nvim --headless -c "lua print(vim.inspect(CONFIG_PATH))" -c "qa" 2>&1

# Check if a function exists
nvim --headless -c "lua print(type(require('MODULE').FUNCTION))" -c "qa" 2>&1
# function = exists, nil = doesn't exist

# Get leader/localleader
nvim --headless -c "lua print('leader:', vim.g.mapleader, 'localleader:', vim.g.maplocalleader)" -c "qa" 2>&1

# Check LazyVim extras
cat ~/.config/nvim/lazyvim.json 2>/dev/null || echo "Not a LazyVim config"

<decision_tree>
1. Can I reproduce/verify this myself?
   ├─ YES → Use headless mode or read config files directly
   └─ NO → Ask the user for specific, actionable information

2. Is the problem intermittent or consistent?
   ├─ Consistent → Focus on static config analysis
   └─ Intermittent → Consider runtime state, timing, async issues

3. Did this work before?
   ├─ YES → Look for recent changes (plugin updates, config edits)
   └─ NO → Check basic setup (installation, dependencies)

4. Is this isolated or widespread?
   ├─ Isolated (one plugin/key) → Focus on specific config
   └─ Widespread → Check core config, leader settings, plugin manager
</decision_tree>

<analysis>
Symptom: which-key popup doesn't appear for localleader prefix

Hypotheses (ordered by likelihood):
1. localleader not triggering which-key (most common with LazyVim)
2. localleader mappings not registered
3. localleader itself not set correctly
4. which-key not installed/loaded

Test plan:
1. Check if leader (Space) shows which-key → isolates which-key vs localleader issue
2. Headless: verify localleader value
3. Headless: check which-key config for localleader trigger
</analysis>

## Diagnosis

**Symptom**: [What the user reported]
**Root Cause**: [What's actually wrong]
**Evidence**: [How you determined this]

## Solution

[Step-by-step fix]

## Prevention

[How to avoid this in the future, if applicable]