async-bash-mcp 0.1.0

A robust subprocess execution MCP

MCP spawning and managing bash tasks

tools provided:

1. spawn : lauch a command

• parameters:
  • command: str, the bash command to run
  • cwd: str, optional path to the cwd to use.
• Spawns a bash command in a subshell asynchronously, returns a ID (int) of the newly launched task

2. list :

• parameters: none
• Returns a list of the currently running processes each is a dictionary of [{"ID": int, "command": str, "done": bool}]. Tasks will be removed from the list when their result has been accessed via wait or poll

3. poll, check the progress of a task

• parameters: ID: int the command to check, wait: int wait for the process to finish executing or for wait ms to elapse. terminate: bool = false an optional parameter which triggers the command to be terminated with SIG_TERM before returning the command results
• If poll is executed multiple times for a single process it will only return the stdout and stderr that was produced since the last call to poll (no duplicate outputs)
• returns dictionary {"stdout": str, "stderr": str, "elapsedTime": float, "finished": bool, "exitCode": int} exitCode will only be present if finished is true. elapsedTime will be the number of milliseconds since the command started.

Requirements

1. Must support multiple concurrent clients
2. Each tool must have a description which is well designed to be consumed by an LLM
3. Results should be presented in a format which is suitable for and LLM
4. Uses the users default shell (bash, zsh, fish)

launching the MCP

This MCP is launched with uv via

uv run async-bash-mcp