Session 3 was the move — a skill. Session 4 is the workspace — a project to run those moves inside. These five tools are everything you need to build a project that retrieves the right thing instead of drowning in everything. Build one project before Session 5 so you walk in ready to give it hands in Cowork.
The 5-block template that tells a project what it does — separate from your global Instructions for Claude. Copy it, fill the brackets, paste into your project's settings. 300–500 words, every time.
The structure card — upload order, the 3–5 cap, how to categorize, how to name for search, and the refresh cadence per file type. The skeleton. Resource 04 is the content rules that go on it.
The decision card that kills the most common confusion after Sessions 3 and 4. One table matches the situation to the tool, the five tests for when a project earns its keep, and the two-rooms map: claude.ai vs Cowork.
How project search actually works — reads-everything vs RAG, where the ~12-file line is, how to read the badge, the token truth, and the feed/starve rules. Plus the copy-paste phrases to direct the search. This is the teach nobody else gives you.