shopping

From the files and frontmatter at commit 38bbb45. This is how much a skill can do, not whether it is risky.

• Runs shell commands

  Its instructions or files give the agent commands to run on your computer.

Pattern check: 1 item to review · commit 38bbb45 · 3 Nov 2026

• R22 · HighTelling the agent to hide what it does

  SKILL.md:117 (opens in a new tab)

  2. Keep the `cart_id` for the rest of the conversation. It is internal state — never show it to the user.

We checked every text file in this skill, at commit 38bbb45 on 3 Nov 2026, against 45 published patterns such as download-and-run commands, hidden text and credential access. We don't run the skill, we don't read the web pages it points to, and we can't judge everything its instructions might lead an agent to do. In published tests, pattern checks like this one missed most malicious skills. Read the skill before you install it — especially anything it asks you to download or run.

How the check worksReport an incorrect finding

Each agent reads SKILL.md a little differently. We check the file against each one's published rules; we don't run the skill in any agent.

• Agent Skills specPasses with warnings

  The open format from agentskills.io, held to the strictest version of each rule among the agents we check.

  • Warning

    metadata values should be text; includeInPrompt (true or false) is not. The spec's validator turns them into text; other readers may not. O4

    Fix: Quote each value, for example version: "1.0".

  • Warning

    The body is about 8,999 tokens (approx.); the spec suggests under 5,000. B2

    Fix: Move detail into reference files that the agent reads only when needed.

  • Note

    The first sentence of the description is 251 characters. Agents shorten long descriptions, so lead with the main job. D8

    Fix: Start with one short sentence that names the job.

  • Note

    There is no license field, so readers can't tell whether they may reuse the skill. O2

    Fix: Add license: with an SPDX name such as MIT or Apache-2.0, or the name of a bundled licence file.

  • Note

    Reference files over 100 lines with no table of contents at the top: references/shopify-ucp.md (415 lines). B5

    Fix: Add a short list of the sections at the top of each.

• Claude CodePasses

  Claude Code reads its own extra fields, ignores unknown ones, and still loads a skill whose frontmatter is broken, without its fields.

  • Note

    The first sentence of the description is 251 characters. Agents shorten long descriptions, so lead with the main job. D8

    Fix: Start with one short sentence that names the job.

  • Note

    The body is about 8,999 tokens (approx.); the spec suggests under 5,000. After compaction Claude Code keeps only the first 5,000 tokens of a skill. B2

    Fix: Move detail into reference files that the agent reads only when needed.

  • Note

    Reference files over 100 lines with no table of contents at the top: references/shopify-ucp.md (415 lines). B5

    Fix: Add a short list of the sections at the top of each.

• Claude apps & API uploadPasses

  Uploading to claude.ai or the Claude API, or packaging with Anthropic's script, accepts only the six spec fields and stops on anything else.

  • Note

    The description is 380 characters. The claude.ai Help Center says 200 at most, though Anthropic's API docs and validator allow 1,024. D4

    Fix: If the claude.ai upload refuses it, trim the description to 200 characters.

  • Note

    metadata values should be text; includeInPrompt (true or false) is not. The spec defines metadata as text to text. O4

    Fix: Quote each value, for example version: "1.0".

  • Note

    The body is about 8,999 tokens (approx.); the spec suggests under 5,000. Anthropic's guidance says the same. B2

    Fix: Move detail into reference files that the agent reads only when needed.

  • Note

    Reference files over 100 lines with no table of contents at the top: references/shopify-ucp.md (415 lines). B5

    Fix: Add a short list of the sections at the top of each.

• OpenAI (Codex & API)Passes with warnings

  Codex finds SKILL.md by its exact name and needs a description; OpenAI's Skills API checks the frontmatter against the spec and caps uploads.

  • Warning

    metadata values should be text; includeInPrompt (true or false) is not. OpenAI's upload follows the spec's text-to-text rule. O4

    Fix: Quote each value, for example version: "1.0".

  • Note

    The first sentence of the description is 251 characters. Agents shorten long descriptions, so lead with the main job. D8

    Fix: Start with one short sentence that names the job.

• VS Code & CopilotPasses

4 files