Multimodal

---
name: mk:multimodal
description: Process images, video, audio, PDFs with Gemini API. Generate images (Nano Banana 2), videos (Veo 3), speech (MiniMax TTS), music (MiniMax). Convert documents to Markdown. Multi-provider fallback (Gemini → MiniMax → OpenRouter). Activate when task references media files, asks to analyze/describe/transcribe/extract/generate/convert, or involves non-text binary files.
version: 2.1.0
argument-hint: "[file-path] [task]"
phase: on-demand
source: local
trust_level: kit-authored
injection_risk: low
requires_env:
  - name: MEOWKIT_GEMINI_API_KEY
    required: true
    description: "Google Gemini API key (falls back to GEMINI_API_KEY)"
    setup: "Get from https://aistudio.google.com/apikey"
    fallback: "Analysis requires this key. Generation falls back to MiniMax/OpenRouter if available."
  - name: MEOWKIT_MINIMAX_API_KEY
    required: false
    description: "MiniMax API key for image/video/TTS/music generation"
    setup: "Get from https://platform.minimax.io/"
keywords:
  [
    multimodal,
    gemini,
    image-gen,
    video-gen,
    tts,
    transcription,
    document-conversion,
    vision,
    image,
    video,
    audio,
    minimax,
  ]
when_to_use: "Use when processing images, video, audio, PDFs or generating media via Gemini/MiniMax/OpenRouter. Activate when task references media files."
user-invocable: true
allowed-tools:
  - Bash
  - Read
  - Write
  - Edit
---

<!-- SECURITY ANCHOR
This skill's instructions operate under project security rules.
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# Multimodal Analysis & Generation

> **Path convention:** Commands below assume cwd is `$CLAUDE_PROJECT_DIR` (project root). Prefix paths with `"$CLAUDE_PROJECT_DIR/"` when invoking from subdirectories.

## Overview

Analyze images, video, audio, and documents — or generate images, videos, speech, and music — using Gemini and MiniMax APIs. Multi-provider fallback: Gemini → MiniMax → OpenRouter. All routing and models configurable via `.env`.

## Models & Limits

Model IDs (verified 2026-04-22; provider model roster changes — re-verify via provider dashboards before relying on specific preview IDs):

- **Analysis:** `gemini-2.5-flash` (stable default)
- **Image generation:** `gemini-3.1-flash-image-preview` (Nano Banana 2, preview-channel)
- **Video generation:** `veo-3.1-generate-preview` (Gemini, preview-channel) or `MiniMax-Hailuo-2.3`
- **TTS:** `speech-2.8-hd`
- **Music:** `music-2.6`

Preview-channel IDs may rotate without notice. Full live table with pricing: [references/models-and-pricing.md](references/models-and-pricing.md).

MiniMax models require `MEOWKIT_MINIMAX_API_KEY`: `image-01` (images), `MiniMax-Hailuo-2.3` (video), `speech-2.8-hd` (TTS), `music-2.6` (music).

## Scripts

**`scripts/gemini_analyze.py`** — Analyze media files

```bash
.claude/skills/.venv/bin/python3 .claude/skills/multimodal/scripts/gemini_analyze.py \
  --files <path> --task <analyze|transcribe|extract> [--resolution low-res] [--json] [--verbose]
```

**`scripts/gemini_generate.py`** — Generate images/videos (Gemini, with --provider for fallback)

```bash
.claude/skills/.venv/bin/python3 .claude/skills/multimodal/scripts/gemini_generate.py \
  --task <generate-image|generate-video> --prompt "description" [--provider minimax] [--json]
```

**`scripts/minimax_generate.py`** — MiniMax generation (image, video, TTS, music)

```bash
.claude/skills/.venv/bin/python3 .claude/skills/multimodal/scripts/minimax_generate.py \
  --task <generate-image|generate-video|generate-speech|generate-music> --prompt "..." [--json]
```

**`scripts/document_converter.py`** — Convert documents to Markdown

```bash
.claude/skills/.venv/bin/python3 .claude/skills/multimodal/scripts/document_converter.py \
  --files doc.pdf --output ./docs/ [--json] [--verbose]
```

**`scripts/check_setup.py`** — Verify API keys and dependencies

```bash
.claude/skills/.venv/bin/python3 .claude/skills/multimodal/scripts/check_setup.py
```

Prints PASS/FAIL status for each API key (MEOWKIT_GEMINI_API_KEY, MEOWKIT_MINIMAX_API_KEY, optional MEOWKIT_OPENROUTER_API_KEY) and core Python dependencies. Run before first use to surface missing env vars.

## References

Load **only when executing** the corresponding step.

| Reference                                                           | When to load              | Content                            |
| ------------------------------------------------------------------- | ------------------------- | ---------------------------------- |
| **[vision-understanding.md](./references/vision-understanding.md)** | Image analysis            | Detection, segmentation, OCR       |
| **[audio-processing.md](./references/audio-processing.md)**         | Audio/video transcription | Formats, splitting, timestamps     |
| **[models-and-pricing.md](./references/models-and-pricing.md)**     | Model selection, cost     | Full model table, pricing          |
| **[image-generation.md](./references/image-generation.md)**         | Image generation          | Nano Banana 2, OpenRouter fallback |
| **[video-generation.md](./references/video-generation.md)**         | Video generation          | Veo 3.1, async polling             |
| **[video-analysis.md](./references/video-analysis.md)**             | Video analysis            | Resolution modes, cost math        |
| **[minimax-generation.md](./references/minimax-generation.md)**     | MiniMax generation        | Image, video, TTS, music           |
| **[document-conversion.md](./references/document-conversion.md)**   | Document conversion       | Formats, batch mode                |

## When to Use

**Auto-activate on these patterns:**

- Task references image (.png, .jpg, .webp), video (.mp4, .mov), audio (.mp3, .wav), or document (.pdf, .docx) files
- Task asks to "analyze", "describe", "transcribe", "extract", "OCR"
- Task asks to "generate image", "generate video", "create image"
- Task asks to "generate speech", "text to speech", "TTS"
- Task asks to "generate music", "create music"
- Task asks to "convert document", "convert PDF to markdown"
- User references a non-text binary file for processing

**Do NOT invoke when:** text-only files (use Read), Gemini API docs (use mk:docs-finder), already-described image in context.

## API Key Check

Check: is `MEOWKIT_GEMINI_API_KEY` (or legacy `GEMINI_API_KEY`) set?

- If yes → proceed with Gemini
- If no → check `MEOWKIT_MINIMAX_API_KEY` for generation tasks
- If neither → STOP with setup instructions

## Analysis Process

Detect media format → select model (default: gemini-2.5-flash) → run script. For >20MB files, use File API. Use `--resolution low-res` for video (62% savings, video only). Output capped at ~3000 tokens; prefer structured JSON/Markdown.

## Generation Process

Provider router auto-selects best available provider by checking API keys:

- **Image:** Gemini → MiniMax → OpenRouter
- **Video:** Gemini → MiniMax
- **TTS:** MiniMax only
- **Music:** MiniMax only

Force a provider: `--provider gemini|minimax|openrouter`. Override chain order via `MEOWKIT_IMAGE_PROVIDER_CHAIN` etc.

## Files in This Skill

```
mk:multimodal/
├── SKILL.md
├── references/               — per-capability reference files (8 files)
├── workflows/                — step-by-step workflow guides
│   ├── audio-transcription.md
│   ├── document-extraction.md
│   └── image-analysis.md
└── scripts/                  — Python modules (run via .claude/skills/.venv/bin/python3)
    ├── gemini_analyze.py     — primary analysis driver (images, video, audio, PDFs)
    ├── gemini_generate.py    — Gemini image/video generation with provider fallback
    ├── minimax_generate.py   — MiniMax image/video/TTS/music generation
    ├── document_converter.py — PDF/docx → Markdown conversion
    ├── check_setup.py        — API key and dependency verification
    ├── provider_router.py    — multi-provider selection logic
    ├── api_key_rotator.py    — Gemini key rotation on rate limits
    ├── minimax_api_client.py — MiniMax API client wrapper
    ├── openrouter_fallback.py — OpenRouter fallback for image gen
    ├── media_optimizer.py    — pre-processing and chunking for large files
    ├── video_generator.py    — async video polling + download helper
    ├── analyze_constants.py  — shared model/endpoint constants
    ├── analyze_core.py       — shared analysis logic reused by analyze scripts
    └── env_utils.py          — env var loading and validation helpers
```

## Gotchas

- **Python venv required**: if you get `python3: command not found` or import errors, run `.claude/scripts/bin/setup-workflow` once from the project root.
- **Audio >15 min**: Gemini truncates silently. Split first.
- **PDF >100 pages**: Quality degrades. Process in 20-page chunks.
- **Video cost**: ~263 tokens/sec at default resolution. Use `--verbose` for cost estimate.
- **Image gen requires billing**: Free tier = no gen. Use MiniMax/OpenRouter as fallback.
- **MiniMax video timeout**: Hailuo takes 60-180s. Max 600s.
- **TTS voices**: 300+ system voices (see [provider catalog](https://platform.minimax.io/docs/faq/system-voice-id) for live list). Default: `Wise_Woman`. See minimax-generation.md.
- **Temperature**: Keep Gemini at 1.0. Lowering causes degraded output.

## Failure Handling

- **Missing API key** → STOP + setup instructions
- **Invalid key (401)** → STOP + re-check key
- **Rate limit (429)** → key rotation (`MEOWKIT_GEMINI_API_KEY_2/3/4`), else wait 60s
- **Billing required** → provider router tries MiniMax/OpenRouter fallback

## Setup

Set `MEOWKIT_GEMINI_API_KEY` in env or `.env` file. Legacy `GEMINI_API_KEY` also works.
Optional: `MEOWKIT_MINIMAX_API_KEY` for TTS/music and alternative generation.

**Budget rule:** ≤3000 tokens inline. If response exceeds budget, summarize key findings before returning.