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Tracks›Claude Cowork
L1Lesson 1Free

Start with one safe folder

Local files without chaos

After this, you'll be able to create a safe folder rule and use it to make Claude's work with local files safer and easier to verify.

The idea

Desktop file work starts with a narrow source set. One safe folder beats broad access. This lesson asks you to make a safe folder rule, not a broad promise that Claude can use files. The output should be specific enough that you can inspect what Claude read, what it produced, and what still needs review.

A huge document pile threatens to enter the work path all at once.
A huge document pile threatens to enter the work path all at once.

Here is the before and after: Before, Claude sees a vague pile of documents and you cannot tell what mattered. After, the folder rule names the task, included files, excluded files, sensitive files, expected output, and first inventory step. For example, a client folder might include notes, drafts, exports, and old versions. The lesson output should say which files are in scope, which are out, what Claude is making, and how you will prove the result came from the right source.

Now try it: Pick one folder for one job and ask Claude to list what it can see before it writes anything. Make one choice before asking Claude to work: folder, file set, output shape, source check, access path, or maintenance rule. That choice keeps desktop file work from becoming vague local search.

Start with one safe folderThe safe folder rule narrows source files before Claude starts producing work.
Messy inputThe raw desktop files material before the lesson shapes it.
a safe folder ruleThe thing you can inspect, edit, and reuse.
1Review checkThe source check that catches a weak assumption.
Next stepThe output moves into the next lesson instead of sitting alone.

The lesson is done when you can show the source boundary, the output, and the check that proves the output is safe to use.

Try it (14 min)

Watch out for

  • Pointing Claude at a broad folder before the source boundary is clear.
  • Asking for final output before Claude proves which files it used.
  • Mixing sensitive, stale, draft, and final files in one source set.

Paste this into Claude

Help me pick one safe desktop folder for this task: [task]. Ask what files are in it, which files are sensitive, which files are stale, what output I want, and what Claude must not touch. Then write a safe folder rule.

If any input is missing, ask me up to three questions before producing the artifact. Then return five sections: Finished Artifact, Realistic File Example, Assumptions To Check, What I Should Use In The Next Lesson, and One Risk If I Trust This Without Fixing It. Keep the answer practical enough that I can paste it into my folder workflow notes.

Created by potrace 1.16, written by Peter Selinger 2001-2019 What a good response looks like

Finished Artifact:
- a safe folder rule
- Why it matters: it gives the folder workflow a concrete thing to inspect instead of a vague intention.
- Use it next: paste this artifact into the next lesson before asking Claude to write, build, import, publish, or review anything.

Reality Check:
- The artifact names the user, input, decision, owner, or proof it depends on.
- The weakest assumption is visible.
- The next step can be completed in one sitting.

Created by potrace 1.16, written by Peter Selinger 2001-2019 What good looks like

  • The folder is narrow enough for one job.
  • Sensitive and stale files are named.
  • Expected output is clear.
  • The first action is inventory, not final output.

Created by potrace 1.16, written by Peter Selinger 2001-2019 Go deeper (8 min)

Paste this into Claude

Without rereading the lesson, explain why a safe folder rule matters in three bullets. Then apply it to a second file example: [describe a different folder or document set]. Return What Changed, What Stayed The Same, What To Check Before Trusting The Output, and the exact next action.

Created by potrace 1.16, written by Peter Selinger 2001-2019 What a good response looks like

Transfer Check:
- What changed: the second example has a different audience, input, or delivery context.
- What stayed the same: a safe folder rule still needs a source, a review check, and a next step.
- Before trusting it: inspect the source check that would catch a wrong assumption.
- Next action: run the check once, then carry the revised artifact into the next lesson.

Created by potrace 1.16, written by Peter Selinger 2001-2019 What good looks like

  • You explained the lesson idea from memory before applying it again.
  • The second example changes the artifact instead of copying the first answer.
  • The trust check names a real risk.
  • The next action can be done in one sitting.

When this breaks

  • Breaks when the folder is too broad because Claude cannot tell which files matter most.
  • Fails when sensitive files are mixed in because the safest source boundary was never drawn.

AI can help with this

Paste the exercise prompt into Claude with your real folder or file context. Ask Claude to interview you one question at a time, produce a safe folder rule, challenge the weakest assumption, and rewrite the artifact once so it is ready for the next file step.

One safe folder is selected and everything outside it stays behind a boundary.

Created by potrace 1.16, written by Peter Selinger 2001-2019 You can now

✓

You can point to a safe folder rule.

  • ✓You can explain which files are in scope.
  • ✓You can name the assumption that still needs checking.
  • ✓You can use the output in the next lesson.

Key takeaways

A safe folder rule gives Claude useful context without turning your whole desktop into the source.

  1. 1Start with one folder and one job.
  2. 2Separate sensitive files before the run.
  3. 3Inventory comes before output.
  4. 4A narrow source set makes review possible.

Created by potrace 1.16, written by Peter Selinger 2001-2019 Go deeper

  • Install Claude for Desktop

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