wcgw

# Shell and Coding agent for Claude and other mcp clients

Empowering chat applications to code, build and run on your local machine.

wcgw is an MCP server with tightly integrated shell and code editing tools.

> ⚠️ **Warning**: This MCP server provides unfiltered access to your machine's shell and files. It does not restrict LLMs from executing arbitrary commands or making unintended changes. This tool can be misused by attackers or run dangerous commands if the AI hallucinates. Run this repository **only** if you fully understand and accept the risks associated with running AI agents with no restrictions.

As of 2026 the reason you could use `wcgw` is that it provides fully interactive shell experience that you and the agent both can control (including sending key-strokes). 
Combined with the wcgw vscode extension that attaches the agent's shell in your editor, you can get the best agentic shell experience that is out there.
The file editing tricks and the general minimalism also helps agent be more productive.


[![Tests](https://github.com/rusiaaman/wcgw/actions/workflows/python-tests.yml/badge.svg?branch=main)](https://github.com/rusiaaman/wcgw/actions/workflows/python-tests.yml)
[![Mypy strict](https://github.com/rusiaaman/wcgw/actions/workflows/python-types.yml/badge.svg?branch=main)](https://github.com/rusiaaman/wcgw/actions/workflows/python-types.yml)
[![Build](https://github.com/rusiaaman/wcgw/actions/workflows/python-publish.yml/badge.svg)](https://github.com/rusiaaman/wcgw/actions/workflows/python-publish.yml)
[![codecov](https://codecov.io/gh/rusiaaman/wcgw/graph/badge.svg)](https://codecov.io/gh/rusiaaman/wcgw)

## Demo

![Workflow Demo](static/workflow-demo.gif)

## Updates

- [6 Oct 2025] Model can now run multiple commands in background. ZSH is now a supported shell. Multiplexing improvements.

- [27 Apr 2025] Removed support for GPTs over relay server. Only MCP server is supported in version >= 5.

- [24 Mar 2025] Improved writing and editing experience for sonnet 3.7, CLAUDE.md gets loaded automatically.

- [16 Feb 2025] You can now attach to the working terminal that the AI uses. See the "attach-to-terminal" section below.

- [15 Jan 2025] Modes introduced: architect, code-writer, and all powerful wcgw mode.

- [8 Jan 2025] Context saving tool for saving relevant file paths along with a description in a single file. Can be used as a task checkpoint or for knowledge transfer.

- [29 Dec 2024] Syntax checking on file writing and edits is now stable. Made `initialize` tool call useful; sending smart repo structure to claude if any repo is referenced. Large file handling is also now improved.

- [9 Dec 2024] [Vscode extension to paste context on Claude app](https://marketplace.visualstudio.com/items?itemName=AmanRusia.wcgw)

## 🚀 Highlights

- ⚡ **Create, Execute, Iterate**: Ask claude to keep running compiler checks till all errors are fixed, or ask it to keep checking for the status of a long running command till it's done.
- ⚡ **Large file edit**: Supports large file incremental edits to avoid token limit issues. Smartly selects when to do small edits or large rewrite based on % of change needed.
- ⚡ **Syntax checking on edits**: Reports feedback to the LLM if its edits have any syntax errors, so that it can redo it.
- ⚡ **Interactive Command Handling**: Supports interactive commands using arrow keys, interrupt, and ansi escape sequences.
- ⚡ **File protections**:
  - The AI needs to read a file at least once before it's allowed to edit or rewrite it. This avoids accidental overwrites.
  - Avoids context filling up while reading very large files. Files get chunked based on token length.
  - On initialisation the provided workspace's directory structure is returned after selecting important files (based on .gitignore as well as a statistical approach)
  - File edit based on search-replace tries to find correct search block if it has multiple matches based on previous search blocks. Fails otherwise (for correctness).
  - File edit has spacing tolerant matching, with warning on issues like indentation mismatch. If there's no match, the closest match is returned to the AI to fix its mistakes.
  - Using Aider-like search and replace, which has better performance than tool call based search and replace.
- ⚡ **Shell optimizations**:
  - Current working directory is always returned after any shell command to prevent AI from getting lost.
  - Command polling exits after a quick timeout to avoid slow feedback. However, status checking has wait tolerance based on fresh output streaming from a command. Both of these approach combined provides a good shell interaction experience.
  - Supports multiple concurrent background commands alongside the main interactive shell.
- ⚡ **Saving repo context in a single file**: Task checkpointing using "ContextSave" tool saves detailed context in a single file. Tasks can later be resumed in a new chat asking "Resume `task id`". The saved file can be used to do other kinds of knowledge transfer, such as taking help from another AI.
- ⚡ **Easily switch between various modes**:
  - Ask it to run in 'architect' mode for planning. Inspired by adier's architect mode, work with Claude to come up with a plan first. Leads to better accuracy and prevents premature file editing.
  - Ask it to run in 'code-writer' mode for code editing and project building. You can provide specific paths with wild card support to prevent other files getting edited.
  - By default it runs in 'wcgw' mode that has no restrictions and full authorisation.
  - More details in [Modes section](#modes)
- ⚡ **Runs in multiplex terminal** Use [vscode extension](https://marketplace.visualstudio.com/items?itemName=AmanRusia.wcgw) or run `screen -x` to attach to the terminal that the AI runs commands on. See history or interrupt process or interact with the same terminal that AI uses.
- ⚡ **Automatically load CLAUDE.md/AGENTS.md** Loads "CLAUDE.md" or "AGENTS.md" file in project root and sends as instructions during initialisation. Instructions in a global "~/.wcgw/CLAUDE.md" or "~/.wcgw/AGENTS.md" file are loaded and added along with project specific CLAUDE.md. The file name is case sensitive. CLAUDE.md is attached if it's present otherwise AGENTS.md is attached.

## Claude setup (using mcp)

### Mac and linux

First install `uv` using homebrew `brew install uv`

(**Important:** use homebrew to install uv. Otherwise make sure `uv` is present in a global location like /usr/bin/)

Then create or update `claude_desktop_config.json` (~/Library/Application Support/Claude/claude_desktop_config.json) with following json.

```json
{
  "mcpServers": {
    "wcgw": {
      "command": "uvx",
      "args": ["wcgw@latest"]
    }
  }
}
```

Then restart claude app.

**Optional: Force a specific shell**

To use a specific shell (bash or zsh), add the `--shell` argument:

```json
{
  "mcpServers": {
    "wcgw": {
      "command": "uvx",
      "args": ["wcgw@latest", "--shell", "/bin/bash"]
    }
  }
}
```

_If there's an error in setting up_

- If there's an error like "uv ENOENT", make sure `uv` is installed. Then run 'which uv' in the terminal, and use its output in place of "uv" in the configuration.
- If there's still an issue, check that `uv tool run --python 3.12 wcgw` runs in your terminal. It should have no output and shouldn't exit.
- Try removing ~/.cache/uv folder
- Try using `uv` version `0.6.0` for which this tool was tested.
- Debug the mcp server using `npx @modelcontextprotocol/inspector@0.1.7 uv tool run --python 3.12 wcgw`

### Windows on wsl

This mcp server works only on wsl on windows.

To set it up, [install uv](https://docs.astral.sh/uv/getting-started/installation/)

Then add or update the claude config file `%APPDATA%\Claude\claude_desktop_config.json` with the following

```json
{
  "mcpServers": {
    "wcgw": {
      "command": "wsl.exe",
      "args": ["uvx", "wcgw@latest"]
    }
  }
}
```
When you encounter an error, execute the comm

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