VS Code — langstage-vscode

The VS Code stage: chat with your LangGraph agent inside VS Code — in the same chat panel as Copilot — via the @langstage chat participant.

dkedar7/langstage-vscode PyPI

It has two parts in one repo: a TypeScript extension that registers the @langstage participant, and a Python stdio sidecar (langstage-vscode) that loads your agent and streams its events using the shared langgraph-stream-parser wire vocabulary.

Quickstart

pip install langstage-vscode          # the sidecar

# Run the extension from source (until it's on the Marketplace):
cd extension && npm install && npm run compile
# then press F5 in VS Code to launch an Extension Development Host

In the chat panel:

@langstage summarize the failing tests in this repo and propose a fix

Drive the sidecar directly for testing — including a keyless demo:

LANGSTAGE_AGENT_SPEC=./my_agent.py:graph python -m langstage_vscode
python -m langstage_vscode --demo
python -m langstage_vscode --show-config

Configuration

Set langstage.agentSpec in VS Code settings, or leave it empty and let the sidecar resolve the family-standard chain (langstage.toml / LANGSTAGE_AGENT_SPEC). A project with [agent] spec = "..." in its langstage.toml needs no VS Code setting at all.

Status: early

The extension isn't on the VS Code Marketplace yet (run from source), and interactive HITL approval isn't wired into the chat UI yet (the sidecar already supports the round-trip). A real in-editor screenshot is a planned follow-up.