Build auditable Excel workbooks headless with openpyxl — blue/black/green cell conventions, formulas over hardcodes, named ranges, balance checks, sensitivity tables. Use for financial models, audit outputs, reconciliations.
Install
npx skills add NousResearch/hermes-agent --skill excel-authornpx skills add NousResearch/hermes-agent --skill excel-author -a claude-code -gnpx skills add NousResearch/hermes-agent --skill excel-author -a codex -ggemini skills install https://github.com/NousResearch/hermes-agent.git --path optional-skills/finance/excel-authorgh skill install NousResearch/hermes-agent excel-authorgit clone --depth 1 https://github.com/NousResearch/hermes-agent /tmp/NousResearch__hermes-agent
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/NousResearch__hermes-agent/optional-skills/finance/excel-author ~/.claude/skills/excel-author # Claude Code
cp -R /tmp/NousResearch__hermes-agent/optional-skills/finance/excel-author ~/.agents/skills/excel-author # Codex, Cursor, Gemini CLI, Copilot, OpenCode