Marketplace Add Extension Agent Skill

Adds a new extension point route to a Sitecore Marketplace app. Use when the user wants to add a custom field, dashboard widget, context panel, fullscreen page, or standalone route.

3k tokens

context cost

the whole folder, loaded on every use

files

instructions only

copies elsewhere

how many repositories repackaged it

stars on the repo

on the repository, not the skill itself

Install

one command, takes just this skill from the repository

npx skills add https://github.com/vercel-labs/sitecore-skills --skill marketplace-add-extension

What comes with it

8 251 bytes besides the instruction

references/extension-types.md

The instruction itself

6 sections, as written by the author

Add an Extension Point Route

You are helping the user add a new extension point to their Sitecore Marketplace app.

Step 1: Determine Extension Type

Ask the user which type (or infer from $ARGUMENTS):

|------|------|-------------|-------------|

Step 2: Generate the Route

Create the route at app/<extension-type>/page.tsx (or a custom path the user prefers).

See extension-types.md for complete boilerplate templates for each extension type.

Step 3: Register in Developer Portal

Remind the user to register the extension point in the Sitecore Developer Portal:

Go to Developer Portal → Your App → Extension Points
Click "Add Extension Point"
Select the type and set the route path (e.g., /custom-field)

Step 4: Suggest Next Steps

Use /marketplace-build-component to build out the UI
Use /marketplace-sdk-reference to look up available queries/mutations for this extension type
Use /marketplace-add-xmc if the extension needs XM Cloud data

Reference Files

Extension Types — Boilerplate templates for each extension type

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How to use it

Copy the folder

Take vercel-labs/marketplace-add-extension from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.