Agent skill

Vscode Extension Guide En

by sickn33 in sickn33/agentic-awesome-skills

Guide for VS Code extension development from scaffolding to Marketplace publication

MITAuto-check passedDevelopment

Install Vscode Extension Guide En

skills CLI
$ npx skills add sickn33/agentic-awesome-skills --skill vscode-extension-guide-en -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install sickn33/agentic-awesome-skills vscode-extension-guide-en --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/sickn33/agentic-awesome-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/vscode-extension-guide-en .claude/skills/vscode-extension-guide-en && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
vscode-extension-guide-en
GitHub stars
47k
Used in
1 other repo
Token cost
~890 tokens
SKILL.md length
334 words
Files
1
Skills in repo
1,497
Repo updated
First seen
Licence
MIT

At a glance

Guide for VS Code extension development from scaffolding to Marketplace publication

  • Tasks that involve Project scaffolding
  • SKILL.md covers Overview, When to Use This Skill, How It Works and Reference Topics, plus 5 more sections
  • Calls npm and npx
  • Tasks that involve Browser extensions

What it does

Vscode Extension Guide En is an agent skill from sickn33/agentic-awesome-skills. Guide for VS Code extension development from scaffolding to Marketplace publication

Its SKILL.md is about 890 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Development, covering Project scaffolding and Browser extensions. It works with Visual Studio Code. The repository describes itself as: AAS Core is the local, agent-first control plane for complete catalog discovery, agent-owned selection, stack validation, and planning, backed by 2,400+ agentic skills. Includes… The licence is MIT.

When your agent uses it

  • Tasks that involve Project scaffolding
  • Tasks that involve Browser extensions

Example prompts

  • “/vscode-extension-guide-en”

Requirements

  • Node.js

What it can do on your machine

Read from SKILL.md and the folder at commit b84d35a. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • npm
    • npx

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md. Its commands use npm and npx, which can reach the network depending on how they are called.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Vscode Extension Guide En loads about 890 tokens when it runs. Until then it costs about 27 tokens; SKILL.md has 334 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~27
When it runs · the whole SKILL.md, loaded when a task matches
~890

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from sickn33/agentic-awesome-skills at commit b84d35a, republished under its MIT licence (© sickn33). 334 words, ~890 tokens.

Download SKILL.mdSave it as .claude/skills/vscode-extension-guide-en/SKILL.md (or your agent's skills folder).
name
vscode-extension-guide-en
description
Guide for VS Code extension development from scaffolding to Marketplace publication
category
core-dev
risk
safe
source
community
source_repo
lewiswigmore/agent-skills
source_type
community
date_added
2026-04-12
author
lewiswigmore
tags
vscode, extension, ide, typescript, marketplace
tools
claude, cursor, copilot, codex, gemini

VS Code Extension Guide (English)

Overview

An English guide for building VS Code extensions, covering the full lifecycle from scaffolding to Marketplace publication. Includes reference material on webview patterns, CSP security, TreeView, testing, packaging and troubleshooting. Updated for VS Code 1.74+ APIs.

Adapted from aktsmm/agent-skills (CC BY-NC-SA 4.0), translated to English with corrections for current VS Code APIs.

When to Use This Skill

  • Use when creating a new VS Code extension from scratch
  • Use when adding commands, keybindings or settings to an extension
  • Use when building TreeView or Webview UI in an extension
  • Use when publishing an extension to the VS Code Marketplace
  • Use when troubleshooting extension activation or packaging issues

How It Works

Quick Start
bash
npm install -g yo generator-code
yo code
Project Structure
my-extension/
├── package.json          # Extension manifest
├── src/extension.ts      # Entry point
├── out/                  # Compiled JS
├── images/icon.png       # 128x128 PNG for Marketplace
└── .vscodeignore         # Exclude files from VSIX
Building and Packaging
bash
npm run compile           # Build once
npm run watch             # Watch mode (F5 to launch debug)
npx @vscode/vsce package  # Creates .vsix

Reference Topics

The full skill includes detailed reference documents on:

  • Webview patterns with CSP security and message passing
  • TreeView data providers and drag-and-drop
  • Testing setup with @vscode/test-electron
  • Publishing to the VS Code Marketplace
  • AI customization for extension projects
  • Code review prompts for extension code
  • Troubleshooting common extension issues

Install the Full Skill

For the complete guide with all reference documents:

bash
npx skills add lewiswigmore/agent-skills --skill vscode-extension-guide-en

Best Practices

  • Unify package name, setting keys, command IDs and view IDs before publishing
  • Keep package size under 5MB using .vscodeignore
  • Since VS Code 1.74, activationEvents are auto-detected for contributed commands and views
  • Always test with the Extension Development Host (F5) before packaging

Common Pitfalls

  • Problem: Extension not loading Solution: Check activationEvents. Since VS Code 1.74, these are auto-detected for contributed commands/views.

  • Problem: Command not found Solution: Match the command ID exactly between package.json and your code.

  • Problem: Webview content not displaying Solution: Check your Content Security Policy. Use the webview's cspSource property.

  • @test-driven-development - Write tests before implementing extension features
  • @debugging-strategies - Systematic troubleshooting for extension issues

Limitations

  • Use this skill only when the task clearly matches the scope described above.
  • Do not treat the output as a substitute for environment-specific validation, testing, or expert review.
  • Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.

© sickn33, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in skills/vscode-extension-guide-en of sickn33/agentic-awesome-skills.

Open the folder on GitHubat commit b84d35a

Used in 1 other repository

We found 5 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in sickn33/agentic-awesome-skills, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Vscode Extension Guide En next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Vscode Extension Guide En compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Vscode Extension Guide En this skillsickn33/agentic-awesome-skills47k1 repos~890Automated safety check: PassMIT
Rocky Codegenrocky-data/rocky304—~1.9kAutomated safety check: PassApache-2.0
Vibe CodingOfficeDev/microsoft-365-agents-toolkit780—~5.5kAutomated safety check: PassCustom licence
Dev UpFreakStudioCN/mpy-hardware-extension154—~1.3kAutomated safety check: NotesCustom licence
Init Projectmicrobus-io/fabric172—~664Automated safety check: PassApache-2.0
Project Scaffoldingaiskillstore/marketplace433—~2kAutomated safety check: PassNone

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Categories

Questions about Vscode Extension Guide En

What does Vscode Extension Guide En do?

Guide for VS Code extension development from scaffolding to Marketplace publication. Vscode Extension Guide En is an agent skill from sickn33/agentic-awesome-skills.

When should I use Vscode Extension Guide En?

Vscode Extension Guide En fits situations like: tasks that involve Project scaffolding; tasks that involve Browser extensions.

How do I install Vscode Extension Guide En in Claude Code?

Run `npx skills add sickn33/agentic-awesome-skills --skill vscode-extension-guide-en -a claude-code`. Or copy the skill folder (skills/vscode-extension-guide-en in sickn33/agentic-awesome-skills) into .claude/skills/vscode-extension-guide-en in your project. Claude Code loads it when a task matches its description.

How do I install Vscode Extension Guide En in Codex?

Run `npx skills add sickn33/agentic-awesome-skills --skill vscode-extension-guide-en -a codex`. Or copy the skill folder (skills/vscode-extension-guide-en in sickn33/agentic-awesome-skills) into .agents/skills/vscode-extension-guide-en in your project. Codex loads it when a task matches its description.

Can I use Vscode Extension Guide En in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add sickn33/agentic-awesome-skills --skill vscode-extension-guide-en -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/vscode-extension-guide-en, .gemini/skills/vscode-extension-guide-en, .github/skills/vscode-extension-guide-en and .opencode/skills/vscode-extension-guide-en in your project.

What does Vscode Extension Guide En need to run?

Going by SKILL.md and its folder, Vscode Extension Guide En needs the command-line tools its instructions call (npm and npx). Our summary lists: Node.js.

Does Vscode Extension Guide En access the network?

SKILL.md contains no URLs. Its commands use npm and npx, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Vscode Extension Guide En safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Vscode Extension Guide En use?

Vscode Extension Guide En is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Vscode Extension Guide En use?

About 890 tokens (SKILL.md is roughly 3.6k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Vscode Extension Guide En?

Skills that share tags, products or a category with Vscode Extension Guide En: Rocky Codegen (rocky-data/rocky, 304 stars), Vibe Coding (OfficeDev/microsoft-365-agents-toolkit, 780 stars), Dev Up (FreakStudioCN/mpy-hardware-extension, 154 stars) and Init Project (microbus-io/fabric, 172 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Vscode Extension Guide En?

sickn33 (a GitHub user) maintains it in sickn33/agentic-awesome-skills, which has 47,405 GitHub stars. The repository holds 1,497 skills in this directory. The repository was last updated on October 9, 2026.

Source: sickn33/agentic-awesome-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.