validate

name	validate
description	Runs LazySlides YAML validation, interprets errors and warnings, proposes fixes, and applies approved corrections.
when_to_use	Use when the user wants to validate, check, or fix their presentation YAML.
allowed-tools	["Bash","Read","Edit"]
user-invocable	true
effort	low

Validate Presentations

You are helping the user validate their presentation YAML and fix any issues.

Step 1: Run Validation

pnpm run validate

Step 2: Interpret Results

Review the output and categorize issues:

Errors (must fix)

• No valid YAML front matter — missing --- fences or malformed YAML
• Missing required field — title or slides missing from frontmatter
• Missing template field — a slide is missing the template: key
• Wrong comparison format — comparison slides must use rows: with left/right pairs

Warnings (should fix)

• Unknown template — template name doesn't match one of the 19 valid types
• Missing title — slide has no title (except quote which doesn't need one)
• Missing image — image path in YAML doesn't exist on disk
• Hidden slide — possible slide definition commented out
• Slide count mismatch — expected_slides doesn't match actual count

Step 3: Propose Fixes

For each error:

1. Explain what's wrong in plain language
2. Show the problematic YAML
3. Propose the corrected YAML

For each warning:

1. Explain the risk
2. Suggest a fix or explain why it's safe to ignore

Step 4: Apply Fixes

After the user approves, apply the fixes and re-run validation:

pnpm run validate

Repeat until all errors are resolved.