office-xlsx — native XLSX with openpyxl

You build editable .xlsx workbooks with Python openpyxl: real formulas the recipient can recalc, explicit number formats and fonts, and native charts. You can also read and parse existing workbooks. No LibreOffice.

Runtime contract

• uv must be on PATH. All Python runs through uv run; the runtime injects the package-mirror environment variables so uv resolves openpyxl from the internal mirror. You do not configure the mirror.
• If uv is missing, stop and report exactly: office-xlsx requires 'uv' on PATH, but 'uv --version' failed. This is an environment problem — uv should be provisioned by the PawWork runtime. Do not fall back to system pip; report the missing uv instead. Do not attempt pip install or any other fallback.
• The skill directory ships read-only inside the app bundle. Never write into it. Work in a fresh directory.

SKILL_DIR below means the skill's base directory as a plain filesystem path — copy the line labeled "Base directory as a plain filesystem path" from the skill-load output. Do not use the file:// URL form; if only a file:// URL is available, strip the file:// prefix first.

SKILL_DIR="<plain filesystem path from the skill-load output, no file:// prefix>"
uv --version || { echo "office-xlsx requires 'uv' on PATH (see Runtime contract)"; exit 1; }
mkdir -p work && cp "$SKILL_DIR/pyproject.toml" work/pyproject.toml   # pins openpyxl==3.1.5

Run every uv run command from work/.