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copilot-extension-builder

v0.4.0

Interview-driven builder for Copilot agents, skills, and plugins across GitHub Copilot CLI/VS Code, Microsoft 365 Copilot, Copilot Cowork, and Copilot Studio. Helps you decide agent vs plugin vs skill, scaffolds the gaps it owns (GitHub CLI plugin packaging and Cowork), routes to your installed toolkits for the rest, and keeps its own knowledge current from Microsoft Learn and GitHub docs.

Agent Plugins4 Skills

By Brandon MarcurellaLicense: MIT0 GitHub starsUpdated 14 hours ago

Directory evidence

Runtimes
Agent Plugins
Parsed components
4 skill or MCP entries
Source updated
Oct 2, 2026
Manifest status
Canonical path parsed

The directory validates manifest shape and source location. It does not execute the plugin or provide a security endorsement. Review the indexing methodology →

Get the plugin

git clone https://github.com/bmarcurella/copilot-marketplace

Clone the source repository, then follow its setup instructions to add the plugin to a compatible client. The plugin root is cli-plugins/copilot-extension-builder/.

This listing currently publishes only the generic Agent Plugins format. Automatic install commands for other clients are not generated yet.

Plugin files

cli-plugins/copilot-extension-builder/
├── plugin.json
├── skills/build-cli-plugin/SKILL.md
├── skills/build-cowork/SKILL.md
├── skills/copilot-extension-builder/SKILL.md
└── skills/sync-knowledge/SKILL.md

Included Skills4

build-cli-pluginskills/build-cli-plugin/SKILL.md

Use when you want to scaffold, build, or package a GitHub Copilot CLI or VS Code plugin (a plugin.json package). Bundles agents, skills, hooks, and MCP servers into one installable, distributable unit, and can add a marketplace.json catalog. USE FOR: build a plugin, scaffold plugin.json, package my agent/skill, GitHub Copilot CLI plugin, VS Code agent plugin, plugin marketplace, install a local plugin, bundle skills and agents. DO NOT USE FOR: authoring a single standalone agent/skill/instruction/prompt/hook (route to agent-customization); M365/Cowork/Studio plugins.

build-coworkskills/build-cowork/SKILL.md

Use when you want to create or scaffold a Microsoft Copilot Cowork skill or plugin — content you add under Cowork's Customize page (or upload as a package) to teach Cowork new domain expertise or connect it to services. USE FOR: Cowork skill, Cowork plugin, extend Copilot Cowork, upload Cowork package, MOS package, M365 app package for Cowork, SKILL.md, agentSkills, agentConnectors, Cowork Customize, when-to-use description. DO NOT USE FOR: GitHub Copilot CLI/VS Code plugins (use build-cli-plugin); M365 Copilot declarative agents/plugins (route to M365 skills).

copilot-extension-builderskills/copilot-extension-builder/SKILL.md

Use when you want to create, build, or scaffold a Copilot agent, skill, or plugin and may be unsure which one to build or for which surface. Runs a short interview to settle 'agent vs plugin vs skill', picks the right host (GitHub Copilot CLI/VS Code, Microsoft 365 Copilot, Copilot Cowork, Copilot Studio, or Azure AI Foundry), then scaffolds the result or hands off to the right installed skill. USE FOR: build a plugin, create an agent, make a skill, new Copilot extension, scaffold a plugin, Cowork plugin, M365 Copilot plugin, declarative agent, MCP plugin, REST/OpenAPI plugin, GitHub Copilot CLI plugin, 'what should I build', 'agent or plugin', package my agent/skill for sharing. DO NOT USE FOR: general coding questions; running an already-built agent.

sync-knowledgeskills/sync-knowledge/SKILL.md

Use when you want to check for or apply updates to this builder's knowledge, refresh it from Microsoft Learn / GitHub docs, run a freshness check, or self-heal stale references and templates. Compares pinned doc sources against their last-known state, auto-applies low-risk changes, proposes high-risk ones, and logs everything to CHANGELOG.md. USE FOR: check for updates, sync knowledge, refresh docs, update sources, self-update, freshness check, 'is this current', re-check Learn docs. Triggered by the router's freshness gate or invoked directly ('check now').

Plugin manifests1

cli-plugins/copilot-extension-builder/plugin.json
{
  "$schema": "https://agent-plugins.org/schemas/1.0.0/plugin.schema.json",
  "name": "copilot-extension-builder",
  "version": "0.4.0",
  "description": "Interview-driven builder for Copilot agents, skills, and plugins across GitHub Copilot CLI/VS Code, Microsoft 365 Copilot, Copilot Cowork, and Copilot Studio. Helps you decide agent vs plugin vs skill, scaffolds the gaps it owns (GitHub CLI plugin packaging and Cowork), routes to your installed toolkits for the rest, and keeps its own knowledge current from Microsoft Learn and GitHub docs.",
  "author": {
    "name": "Brandon Marcurella"
  },
  "homepage": "https://github.com/bmarcurella/copilot-marketplace/tree/main/cli-plugins/copilot-extension-builder",
  "repository": "https://github.com/bmarcurella/copilot-marketplace",
  "license": "MIT",
  "keywords": [
    "copilot",
    "plugin",
    "agent",
    "skill",
    "scaffold",
    "extensibility",
    "m365-copilot",
    "cowork",
    "copilot-studio",
    "mcp"
  ]
}

For maintainers

If you maintain this plugin, link to this source-backed listing from your README so users can review its manifest and indexed components.

[copilot-extension-builder on Agent Plugins Marketplace](https://pluginsmp.com/plugins/copilot-extension-builder)