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How to Upload and Use Locally-Built Claude Skills in the Claude.ai Web App

Package a local Claude skill for the web app without carrying private files with it, fix the naming and archive structure, upload it to the intended workspace, and test it with synthetic input.

How to Upload and Use Locally-Built Claude Skills in the Claude.ai Web App

Claire zips a locally built skill, fixes its lowercase hyphenated name after the first upload fails, uploads it to Claude, and uses it with customer demo notes.

Before you start

What you need

  • A locally tested Claude skill folder
  • A lowercase hyphenated skill name
  • An inventory of files required at runtime
  • Access to the intended Claude account or workspace
  • Synthetic test input with a known expected result

What you’ll make

A minimal skill archive that uploads successfully, appears in the intended Claude workspace, and handles a representative web-chat request.

Tools used

Step by step

The workflow

Follow the sequence once, then adapt the prompts, checks, and handoffs to your own setup.

4 steps

Step01

Prepare and Zip Your Skill Folder

Copy only the skill files needed at runtime into a clean staging folder. Inspect referenced paths and exclude credentials, customer data, Git history, caches, dependencies, and unrelated examples before creating the zip.

Step02

Check Skill Name Formatting

Make the folder name and the name in SKILL.md identical, lowercase, and hyphenated. Run the validator, inspect the archive listing, and rebuild the zip after any change.

Getting the name format right is a common stumbling block. Double-checking this step can save you from a frustrating upload error.

Step03

Upload the Skill to the Web UI

In the intended Claude account or workspace, open the skill-upload control and choose the new archive. Confirm the uploaded name and remove or distinguish any stale copy before testing.

Step04

Start Using Your Skill

Use synthetic input that has a known expected result. Confirm that Claude selects the skill and follows its output contract, then test one non-matching request to make sure the trigger is not too broad.

Example prompt
Here are synthetic [input type] notes for testing:

[input]

Use the uploaded [skill-name] skill. Follow its required format and do not add facts that are absent from the notes.

What good looks like

  • The archive contains the skill folder at the correct level and no secrets, private data, caches, or unrelated files.
  • The folder name and metadata name follow the accepted lowercase hyphenated format.
  • Claude uses the uploaded skill for matching input and does not confuse it with an older duplicate.
  • The web output matches the local skill's required structure on synthetic test data.

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After the steps

Runbook notes

How to recover when the loop fails and where human judgment helps.

Recover

If it goes sideways

The upload rejects uppercase letters, spaces, or a mismatched metadata name
Rename the folder and metadata with the same lowercase hyphenated value, save the file, and create a fresh archive.
The archive adds an extra wrapper directory or omits files referenced by SKILL.md
Inspect the archive tree before upload and keep the skill folder at the expected root with every referenced relative path intact.
The zip includes credentials, customer data, local caches, or internal examples
Build the archive from an explicit allowlist, inspect its contents, remove sensitive files, and rotate any credential that was exposed.
Claude invokes an older duplicate or behaves differently from the local test
Remove or rename stale copies, confirm the active skill, retest with synthetic input, and account for web tools or permissions the local version used.

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