> ## Documentation Index
> Fetch the complete documentation index at: https://docs.yambr.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Skills reference

> Per-skill capabilities, mount paths, and example invocations.

All public skills are mounted read-only at `/mnt/skills/public/{name}/`. Example skills are at `/mnt/skills/examples/{name}/`.

## docx — Word documents

**Location:** `/mnt/skills/public/docx/`

* Create and edit `.docx` files.
* Work with styles, tables, images.
* OOXML schema validation.
* Tracked changes via OOXML redlining (`<w:ins>` / `<w:del>`).
* Comment tracking.

```python theme={null}
from docx import Document

doc = Document()
doc.add_heading("Report", 0)
doc.add_paragraph("Content here...")
doc.save("/mnt/user-data/outputs/report.docx")
```

## pdf — PDF processing

**Location:** `/mnt/skills/public/pdf/`

* Extract text, tables, images.
* Fill PDF forms (with annotations).
* Create validation images.
* Check bounding boxes.
* Merge, split, flatten.

```bash theme={null}
python3 /mnt/skills/public/pdf/scripts/fill_pdf_form_with_annotations.py \
  /mnt/user-data/uploads/form.pdf \
  /mnt/user-data/outputs/filled.pdf
```

## pptx — PowerPoint presentations

**Location:** `/mnt/skills/public/pptx/`

* Create presentations programmatically.
* Convert HTML to PowerPoint via the bundled `html2pptx` library.
* Manipulate slides, layouts, themes via OOXML.
* Extract thumbnails for visual validation.

```python theme={null}
from pptx import Presentation

prs = Presentation()
slide = prs.slides.add_slide(prs.slide_layouts[0])
slide.shapes.title.text = "My Presentation"
prs.save("/mnt/user-data/outputs/presentation.pptx")
```

## xlsx — Excel spreadsheets

**Location:** `/mnt/skills/public/xlsx/`

* Read/write `.xlsx` with openpyxl.
* Formulas, formatting, charts, multiple worksheets.
* Automatic recalculation via LibreOffice UNO (`recalc.py`).
* Error scanning (`#REF!`, `#DIV/0!`).

## sub-agent — delegate to Claude Code

**Location:** `/mnt/skills/public/sub-agent/`

Teaches the model when and how to call `sub_agent()`. Includes best-practice prompts, model selection guidance, and session-resume patterns. See [Sub-agents](/features/sub-agents).

## playwright-cli — browser automation

**Location:** `/mnt/skills/public/playwright-cli/`

High-level Playwright wrappers: navigate, click, fill, screenshot, extract. Combines with the [live browser](/features/browser) so the user can step in when needed.

## describe-image — vision AI

**Location:** `/mnt/skills/public/describe-image/`

Calls a separate vision model (GPT-4o, Qwen-VL, ...) to describe an image as text — the main model then reasons about the description. Works around the [Open WebUI image-in-tool-result limitation](/reference/known-bugs). Requires `VISION_API_KEY`, `VISION_API_URL`, `VISION_MODEL`.

## frontend-design — production-grade UI

**Location:** `/mnt/skills/public/frontend-design/`

Opinionated React + Tailwind patterns. The model scaffolds, styles, and previews components that look like design-system work, not generic AI output.

## webapp-testing — Playwright-driven QA

**Location:** `/mnt/skills/public/webapp-testing/`

Write and run Playwright test suites against a web app. Pairs with the sub-agent skill for multi-step regression runs.

## doc-coauthoring — structured document work

**Location:** `/mnt/skills/public/doc-coauthoring/`

A workflow for collaborative document edits: extract outline, propose changes, diff, finalize. Good for long-form writing sessions.

## test-driven-development — TDD enforcement

**Location:** `/mnt/skills/public/test-driven-development/`

Forces red-green-refactor: write failing test, implement, refactor. Useful when asking Claude Code to implement a feature inside the sandbox.

## skill-creator — create a new skill

**Location:** `/mnt/skills/public/skill-creator/`

Walks the model through creating a skill folder, `SKILL.md`, scripts, and references. See [Creating skills](/skills/creating).

## gitlab-explorer — GitLab via glab

**Location:** `/mnt/skills/public/gitlab-explorer/`

Browse projects, MRs, pipelines with the `glab` CLI. Requires a PAT — typically via the [Settings Wrapper](/skills/dynamic).

## Example skills

Optional, in `/mnt/skills/examples/`:

`web-artifacts-builder`, `copy-editing`, `social-content`, `canvas-design`, `algorithmic-art`, `theme-factory`, `mcp-builder`, `product-marketing-context`, `writing-skills`, `internal-comms`, `single-cell-rna-qc`, `slack-gif-creator`, `skill-creator` (example variant).

Enable via the Settings Wrapper or by adding the paths to the system prompt directly.