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Quickstart

Install a sealed skill, then seal one of your own. You need Node 20 or newer. Nothing else, and no account.

Install a sealed skill​

Paste the line into any agent, or run it directly:

npx skillseal add sk1qgq6pf8mykkwrqu2ttpynx43f57magyphegd66zrhcpfjz5mlufgaku50584ge6xhzw

You will see each check as it passes:

✓ token checksum is valid          caught offline, before any download
✓ signed by fc0d6de14aa30f9c…      who published these exact bytes
✓ manifest matches the address     the file list was not swapped
✓ all 4 files match their entries  no file was altered

  installed csv-stats → Claude Code / Claude Desktop

skillseal where lists the agents it found. Alter one byte of the source and the install refuses, leaving nothing on disk.

Seal your own​

A skill is a folder with a SKILL.md. Turn it into a line:

skillseal publish ./my-skill --upload

This prints the install line other people paste. --upload stores the bytes so the line resolves anywhere; drop it to print the line and store the bytes yourself. To publish under your own key rather than the shared demo key, set a secret first:

PUBLISHER_SEED="your-secret" skillseal publish ./my-skill --upload

Read a line without installing​

skillseal inspect sk1…

inspect decodes the line and shows what it claims, fully offline. Nothing is fetched.

Next​