An open-source coding agent built with Eve and Vercel Sandbox.
Eve Code is an open-source coding agent for building software in the browser. It combines Eve with isolated Vercel Sandboxes, Convex persistence, and a small web interface around the core coding loop. Web projects run directly from the sandbox with a live preview and hot reload. The codebase stays deliberately small and can be used as a starting point for building your own coding agent with Eve.
Warning
Eve Code does not yet implement authentication or user isolation. Use it with caution until those boundaries are in place. Every visitor to a public deployment can access the shared sessions and workspaces, and sandbox preview URLs are public and unauthenticated. Do not use private code, credentials, secrets, or sensitive data before implementing the necessary security boundaries.
- A fully visible coding loop: Watch tool calls, live shell output, and file diffs as the agent works.
- Live previews with HMR: Open the app directly from Vercel Sandbox and see every change instantly.
- Built-in workspace browser: Navigate the file tree and inspect the source without leaving the chat.
- Durable, real-time sessions: Conversations synchronized across clients.
- Model selection: Switch models from the composer.
- Voice input: Real-time transcriptions using AI SDK.
- Start fresh or from GitHub: Begin with an empty workspace or a public repository.
- Authentication and personal workspaces for multi-user deployments.
- GitHub integration for private repositories and pull request workflows.
- In-browser file editing.
The browser connects to an Eve channel, which runs one durable agent session in its own persistent Vercel Sandbox. The agent uses Eve's file and search tools plus small local adapters for interruptible commands, diff-producing edits, repository cloning, and live previews. Eve streams its reasoning, messages, and tool activity throughout the turn.
An Eve hook saves each completed turn to Convex, even if the browser disconnects. While a turn is running, the browser follows Eve's live stream; when it finishes, the Convex checkpoint becomes the durable history and synchronizes every open client. The workspace browser, command logs, and preview controls all connect to the same sandbox, so every surface reflects the environment the agent is using.
Eve Code intentionally leaves authentication, session ownership, quotas, and pull request workflows out of scope:
- A publicly reachable deployment has no user isolation. Conversations and workspace files are shared with anyone who can access the app.
- Starting a preview exposes the selected sandbox port through a public, unauthenticated URL. Anyone with that URL can access everything the development server makes available.
Keep deployments private and use only non-sensitive code until authentication, authorization, ownership, and preview protection are implemented. These boundaries can be added by applications that use Eve Code as a starting point.
Install the dependencies and connect the project to Vercel and Convex:
bun install
bunx vercel link
bunx vercel integration add convex
bunx vercel env pull .env.local
bun run devSet TRANSCRIPTION_AI_GATEWAY_API_KEY in .env.local to enable voice input.
Eve continues to use Vercel OIDC, independently from this key.
Open http://localhost:5173.
Push a branch or run bunx vercel deploy. The Convex integration provides the
deploy keys, and vercel.json deploys the Vite app and Eve service with an
isolated Convex deployment for each preview.
See ARCHITECTURE.md for the system map, ownership boundaries, and dependency rules.