Presentation Skill

Thin wrapper that routes presentation operations to the presentation-agent.

Context Pointers

Reference (do not load eagerly):

• Path: .claude/context/formats/subagent-return.md
• Purpose: Return validation
• Load at: Subagent execution only

Note: This skill is a thin wrapper. Context is loaded by the delegated agent, not this skill.

Trigger Conditions

This skill activates when:

Direct Invocation

• User runs /convert with a .pptx/.ppt source and --format beamer|polylux|touying
• User requests presentation conversion in conversation

Implicit Invocation (during task implementation)

When an implementing agent encounters any of these patterns:

Plan step language patterns:

• "Convert presentation to Beamer"
• "Extract slides from PowerPoint"
• "Generate Polylux slides"
• "Create Touying presentation"
• "Convert PPTX to LaTeX"

File extension detection:

• Source file has extension: .pptx, .ppt
• Target mentions: "Beamer", "slides", ".tex", "Polylux", "Touying", ".typ"

Task description keywords:

• "presentation conversion"
• "PowerPoint to LaTeX"
• "slide extraction"
• "academic slides"

When NOT to trigger

Do not invoke for:

• Document conversions (use skill-filetypes)
• Spreadsheet conversions (use skill-spreadsheet)
• Simple markdown extraction without slide formatting

Execution

1. Input Validation

Validate required inputs:

• source_path - Must be provided and file must exist
• output_path - Optional, defaults to source dir with .tex extension
• output_format - Optional, defaults to "beamer"
• theme - Optional theme name

# Validate source exists
if [ ! -f "$source_path" ]; then
  return error "Source file not found: $source_path"
fi

# Validate source is presentation format
source_ext="${source_path##*.}"
case "$source_ext" in
  pptx|ppt|md) ;; # Valid
  *) return error "Not a presentation format: .$source_ext" ;;
esac

# Determine output path if not provided
if [ -z "$output_path" ]; then
  source_dir=$(dirname "$source_path")
  source_base=$(basename "$source_path" | sed 's/\.[^.]*$//')

  case "$output_format" in
    beamer|latex|tex) output_path="${source_dir}/${source_base}.tex" ;;
    polylux|touying|typst|typ) output_path="${source_dir}/${source_base}.typ" ;;
    pptx) output_path="${source_dir}/${source_base}_generated.pptx" ;;
    *) output_path="${source_dir}/${source_base}.tex" ;;
  esac
fi

2. Context Preparation

Prepare delegation context:

{
  "source_path": "/absolute/path/to/presentation.pptx",
  "output_path": "/absolute/path/to/slides.tex",
  "output_format": "beamer",
  "theme": "metropolis",
  "metadata": {
    "session_id": "sess_{timestamp}_{random}",
    "delegation_depth": 1,
    "delegation_path": ["orchestrator", "convert", "skill-presentation"]
  }
}

3. Invoke Agent

CRITICAL: You MUST use the Agent tool to spawn the agent.

Required Tool Invocation:

Tool: Agent (NOT Skill, NOT Plan)
Parameters:
  - subagent_type: "presentation-agent"
  - prompt: [Include source_path, output_path, output_format, theme, metadata]
  - description: "Convert {source_path} to {output_format} slides"

The agent will:

• Detect available tools (python-pptx, pandoc, markitdown)
• Extract presentation content
• Generate formatted slide output
• Extract and preserve speaker notes
• Return standardized JSON result

4. Return Validation

Validate return matches subagent-return.md schema:

• Status is one of: converted, partial, failed
• Summary is non-empty and <100 tokens
• Artifacts array present with output file path
• Metadata contains slide count

5. Return Propagation

Return validated result to caller without modification.

Return Format

Expected successful return:

{
  "status": "converted",
  "summary": "Successfully converted presentation.pptx to Beamer slides with 15 slides",
  "artifacts": [
    {
      "type": "implementation",
      "path": "/absolute/path/to/slides.tex",
      "summary": "Beamer presentation with speaker notes"
    }
  ],
  "metadata": {
    "session_id": "sess_...",
    "agent_type": "presentation-agent",
    "delegation_depth": 2,
    "tool_used": "python-pptx+pandoc",
    "slide_count": 15,
    "has_speaker_notes": true
  },
  "next_steps": "Review and compile slides"
}

Error Handling

Input Validation Errors

Return immediately with failed status if source file not found or not a presentation.

Unsupported Format

Return failed status with clear message about supported formats.

Agent Errors

Pass through the agent's error return verbatim.

Tool Not Available

Return failed status with installation instructions.