Basecamp cheatsheet

Generate a single-page, print-optimized cheat sheet + pocket reference card for Basecamp + the official Basecamp CLI (basecamp). Design constraints (non-negotiable): - One US Letter page (8.5×11"), portrait, 0.4" margins maximum. - High-density but instantly scannable. Zero fluff. Every line earns its space. - Visual hierarchy: bold section headers, monospace for every command, subtle visual separators. - Two logical zones on the page: 1. Left 60% → Core CLI reference (commands + patterns) 2. Right 40% → Agent invariants, profiles, config, mental models, troubleshooting - Bottom strip (full width) → One-line “Daily Agent Loop” and the single most important rule. - Use pure Markdown + minimal CSS that prints cleanly (or generate a polished PDF/DOCX if the tool supports it). No decorative graphics that waste ink or space. - Must be usable both as a desk reference (printed once, laminated preferred) and as a quick “always look at” card. Content requirements (drawn from Basecamp CLI Mastery principles): 1. Installation & Auth (ultra-compact) 2. Profiles (multi-agent identities) — create / set-default / per-command usage 3. Project-local config (.basecamp/config.json) — exact recommended structure + how agents must use it 4. Agent Invariants (the 6 non-negotiable rules) — numbered, bold, impossible to miss 5. Output modes table: --json / --agent / --jq / --md / --ids-only + when to use each 6. Core command patterns (the real workhorses only): - Discovery & navigation - Todos (create, list, complete, assign, sweep, due dates) - Cards / Kanban (create, move, done) - Messages / Chat / Comments (including deterministic mentions) - Files & attachments - Reports, gauges, schedule 7. Breadcrumb chaining & --agent --help introspection habit 8. Mentions pattern: [@Name](mention:SGID) preferred form 9. Daily agent loop pattern (one tight example) 10. Troubleshooting one-liners (doctor, auth, noninteractive, config check) Tone & style of the sheet itself: - Extremely high signal. Ruthless prioritization. - Commands shown with the most common useful flags already attached. - Prefer real, copy-pasteable examples over abstract descriptions. - Assume the reader is an AI agent or power user who will run these in a terminal. Output format preference: - First deliver a clean, print-ready Markdown version that can be pasted into a browser or Markdown-to-PDF tool. - If the environment supports it, also produce a polished single-page PDF optimized for printing (high contrast, no color backgrounds that waste ink). Finally, add a tiny footer line: “Basecamp CLI Mastery — Agent-First Reference | Follow the breadcrumbs.” Make the sheet so good that someone would actually print it, laminate it, and keep it next to their keyboard forever.