Claude Code editor integration

Speckit Companion

VS Code extension for spec-driven development — manage specs, workflows, and steering docs for AI CLI tools (Claude Code, Gemini CLI, Copilot CLI)

102 stars 26 forksEditor integrations Plugin marketplace Source

Install

Inside Claude Code
/plugin marketplace add alfredoperez/speckit-companion

Found in the project README. Check it for setup steps after installing.

From source
git clone https://github.com/alfredoperez/speckit-companion.git

From the README

SpecKit Companion

SpecKit Companion is a VS Code extension for developers who build with an AI assistant and Spec Kit. It lists every spec in your project, opens each one as a page you can read and comment on, follows a run while it happens, and keeps a record of what the AI did and why. Your specs stay plain markdown in your repo, with the run record in a file beside each one, so nothing passes through a server of ours.

Install

Search for SpecKit Companion in the Extensions view, or run:

It's on Open VSX too.

The Spec Kit extension (optional)

This second install runs inside Spec Kit and records each run, which is what the Overview above, the Resume button and living specs are built from. Add it from your project root:

That command needs a Spec Kit CLI that has extensions. The install page has the full walkthrough and what to do when a step fails.

First run

1. Open your project folder in VS Code.
2. Click the SpecKit icon in the activity bar.
3. Pick your AI assistant when it asks.
4. Click + in the Specs view, or run SpecKit: New Spec from the command palette, and describe what you want built.

The Quickstart follows one spec from there to done.

What you get

- A sidebar for every spec. Specs are grouped by where they stand, with the status of each document and the assistant each one was last sent to. Viewer and sidebar

- Specs you can read. Requirements are labeled rows, acceptance scenarios read as Given, When, Then, and tasks sit under their phases.

- A plan that draws itself. Call paths, a lifecycle, a screen and annotated code each draw as a card in the plan. Plan blocks

- Review comments on any line. Comment on a spec the way you review a pull request, then click Refine and your assistant edits the spec from your comments. Review with comments

- A…
Read the full README on GitHub

Details

Language
HTML
License
MIT
Last updated
3 November 2026
Topics
ai-toolsclaude-codedeveloper-toolsspec-driven-developmenttypescriptvscode-extension

FAQ

What is Speckit Companion?

VS Code extension for spec-driven development — manage specs, workflows, and steering docs for AI CLI tools (Claude Code, Gemini CLI, Copilot CLI) It is a editor integration for Claude Code, from alfredoperez/speckit-companion on GitHub.

How do I install Speckit Companion?

Run /plugin marketplace add alfredoperez/speckit-companion inside Claude Code, then follow the setup in the README.

Is Speckit Companion popular?

alfredoperez/speckit-companion has 102 GitHub stars and 26 forks. It was last updated on 3 November 2026.

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