# vercel-labs/just-bash

Bash for Agents

Repository: https://github.com/vercel-labs/just-bash
Canonical: https://ross.abutalabs.com/products/just-bash
Homepage: https://justbash.dev/
Language: TypeScript
License Family: other
Last push: 2026-08-26T15:43:40+00:00

## Health v2 (maintenance only)
Score: 83/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 99, longevity 18
- inputs: {"age_days": 253, "days_push": 7, "days_rel": 11, "gap_med": 0, "n_releases_24m": 22}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4212, forks 242 (observed 2026-08-28T04:08:39.128959+00:00)

## What it is
just-bash is a TypeScript-implemented bash interpreter with an in-memory virtual filesystem, designed to give AI agents a secure, sandboxed shell environment. It supports common unix commands and bash syntax, with optional curl, Python, JS/TS, and sqlite support, and allows defining custom commands in TypeScript.

## Use cases
- run bash commands safely inside an AI agent
- sandbox shell execution without a real OS shell
- simulate a filesystem for LLM tool use
- execute unix commands in a browser or Node environment
- give coding agents a terminal tool
- test bash scripts in isolation

## When to choose
- you need a secure sandboxed bash environment for AI agents without container overhead
- you want to run shell commands in pure TypeScript/JavaScript
- you need a virtual filesystem shared across shell invocations
- you want to extend the shell with custom TypeScript commands

## When to avoid
- you need full, byte-perfect bash compatibility with real system behavior
- you need to execute real binaries or access the actual host filesystem
- you need production-grade guarantees — it is beta software

## Facets
- artifact type: library
- maturity: active
- function: interpreter, simulation, security, agent-framework, file-system, cli
- domain: developer-tools, artificial-intelligence
- platform: cross-platform, wasm
- tags: sandboxed-shell, virtual-filesystem, bash-emulation, ai-agent-tools, in-memory-fs, ai-agents, command-line, nodejs, typescript

## Member repositories
- vercel-labs/just-bash (main) score 83

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:39.128959+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:22:28.492535+00:00, confidence not recorded.
  - readme: https://github.com/vercel-labs/just-bash (fetched 2026-08-28T04:08:39.128959+00:00, sha 2ef8e550b34b)
  - homepage: https://justbash.dev/ (fetched 2026-08-29T09:12:53.421011+00:00, sha 83a11d390ddc)
- Data as of 2026-08-30T08:39:29.467469+00:00.