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Recipe: turning scattered notes into a clean document or spreadsheet
Cowork produces structured documents and spreadsheets with working formulas from raw notes: on a large batch, explicitly asking for a plan and then each section separately gives a more reliable result than a single big instruction launched over the whole folder.
Cowork can generate an Excel spreadsheet with working formulas from a simple description, and a complete PowerPoint presentation from a transcript or raw notes, not just formatted text. As recorded on 2 September 2026, the official documentation describes these two capabilities as everyday file creation functions, not as special cases.
Gathering before asking
A good result starts with gathering material, not with a request. Place all the notes, scanned handwritten minutes, copied messages, figures scattered across several loose sheets, into a single shared folder before launching Cowork on them. A folder scattered across several locations forces Claude to guess at what it has not found, and this gap only shows once you reread the finished result. This same shared folder is also the vector Anthropic flags for a hidden instruction slipped into an external file: only put in notes whose origin you know.
Breaking a large request into named steps
A single general instruction, of the kind format this whole folder, gives a result that is harder to correct than a series of precise requests. Ask first for a plan of the document or spreadsheet you want, approve that plan, then ask for each section or each tab separately. Cowork itself breaks a large job down into parallel sub tasks, which speeds up the result but does not replace your own breakdown: a plan approved and then sections requested one by one remain easier to correct than letting Cowork alone judge how to split the work.
Instructions envoyées séparément à Cowork :
1. Lire les notes du dossier Réunions 2026.
2. Proposer un plan en quatre sections.
3. Une fois le plan validé, rédiger la première section.Checking before circulating
For a spreadsheet, a correct figure displayed in a cell does not prove that the formula calculating it is right. Click into every total cell and read the formula shown in the formula bar before circulating the file, the full habit is set out in rebuilding a real spreadsheet or report, not a draft to fix. For a text document, reread the contents page produced before showing it to other members of the cooperative, a misplaced section title is fixed in one sentence when caught early, and ripples through the whole document when it is not.
The same principle applies to a batch of files meant to circulate beyond your own machine. Reopen the document produced once, in full, before sending it to a third party, rather than trusting the preview Cowork displayed during the task alone.
Scattered notes against the structured document they can become
Scanned handwritten minutes, messages copied one by one, figures scattered across several files, with no common plan or title.
A single file with a contents page, named sections, and for a spreadsheet formulas that recalculate each total rather than a fixed figure.
A cooperative treasurer gathers into a single folder twelve scanned meeting minutes and a paper expense table. He asks Cowork for a plan in four sections, approves that plan, then asks for the first section to be drafted, before asking for the following ones one by one.
Write one sentence stating what this situation establishes, and one sentence stating what it does not establish.
What this establishes: It establishes that the treasurer broke the request down into an approved plan followed by named sections requested separately rather than a single general instruction over the whole folder.
What this does not establish: It does not establish the content of the document obtained, nor whether the formulas of any total table were checked before circulation.
The three most common miscalibrations
- Trop large It establishes that breaking a request into separate sections guarantees a document with no calculation errors at all.
- Trop étroit It establishes only that the folder contained twelve meeting minutes, without saying anything about how the request was broken down.
- À côté It establishes that the cooperative holds its meetings on a monthly schedule, since twelve meeting minutes were gathered.
- Cowork produces spreadsheets with working formulas and complete presentations from a simple description, not just formatted text.
- Gathering all the notes into a single folder before launching the task stops Claude guessing at what it has not found.
- Asking for a plan and then each section separately gives a result that is easier to correct than a single general instruction over the whole folder.
- Cowork itself breaks a large job down into parallel sub tasks, but a plan approved and then sections requested one by one remain easier to correct than letting it alone judge the split.
- A correct figure in a cell does not prove that the formula producing it is right.
Gather three or four scattered notes you have at hand into a single folder, ask Cowork for a plan in sections before any drafting, then approve that plan before asking for the first section.
These points depend on an interface or a rule that may have changed since this was written. Check them on your own screen before relying on them.
- The exact name of the button or menu that triggers generating an Excel table in Cowork is not fixed here: check the exact label on your own screen before guiding a colleague step by step.
Every datable claim in this lesson links here to the public text behind it. A source that does not open proves nothing.
- Anthropic, creating and editing files with Claude, spreadsheets and presentations consultée le 2026-09-02
- Anthropic, getting started with Claude Cowork, sub task breakdown and parallel flows consultée le 2026-09-02
- Anthropic, overview of Claude Cowork, sub agent coordination consultée le 2026-09-02