by vellum-ai
An AI Assistant that’s easy to setup, does your work 24/7, knows your preferences and gets better over time.
# Add to your Claude Code skills
git clone https://github.com/vellum-ai/vellum-assistantGuides for using ai agents skills like vellum-assistant.
Last scanned: 5/19/2026
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vellum-assistant is an open-source ai agents skill for AI coding assistants such as Claude Code, Codex CLI, and ChatGPT, built by vellum-ai. An AI Assistant that’s easy to setup, does your work 24/7, knows your preferences and gets better over time. It has 1,418 GitHub stars.
Yes. vellum-assistant passed SkillsLLM's automated security scan — a dependency vulnerability audit plus prompt-injection heuristics — with no high-severity issues. You can read the full report in the Security Report section on this page.
Clone the repository with "git clone https://github.com/vellum-ai/vellum-assistant" and add it to your Claude Code skills directory (see the Installation section above).
vellum-assistant is primarily written in TypeScript. It is open-source under vellum-ai on GitHub, so you can review or fork the full source.
Yes. SkillsLLM lists many other AI Agents skills you can browse and compare side by side. Open the AI Agents category from the badge at the top of this page, or use the Related Skills and comparison links further down to weigh vellum-assistant against similar tools.
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⚠️ Third-Party Software Notice
This skill is third-party open-source software developed and hosted independently on GitHub. SkillsLLM is an informational directory and does not control or maintain the underlying repository.
Any security checks, ratings, or warnings displayed by SkillsLLM are automated and limited in scope. They do not constitute a security certification or guarantee that the software is safe, error-free, or free from malicious code, vulnerabilities, compromised dependencies, or prompt-injection risks.
Review the source code, permissions, dependencies, and configuration before installing or running any third-party skill. Use is at your own risk. To the maximum extent permitted by applicable law, SkillsLLM is not liable for losses arising from third-party software.
See comparison
If you've set up a Personal AI on OpenClaw, Hermes Agent, or Claude Code, you know how long it takes, and how many times you have to hatch a new one to get it right. Vellum gets you the result you're looking for out of the box, one download away.
| Area | Summary |
|---|---|
| Memory | Eight types (episodic, semantic, procedural, emotional, prospective, behavioral, narrative, shared), each with its own staleness window, hybrid dense + sparse retrieval, and per-user and per-channel isolation. Structured items (identity, preferences, projects, events) extracted from conversations with source attribution and dedup. Embeddings run locally by default. Not a SQLite + Markdown file you maintain yourself. |
| Identity | Behavior lives in SOUL.md. During onboarding the assistant observes how you communicate and writes its own personality files. It keeps a per-user journal of reflections and uses NOW.md as a scratchpad for current focus and active threads. |
| Proactivity | Every hour the assistant re-reads its notes, looks for anything unfinished or due soon, and messages you if something needs attention. Notifications go to the right channel and won't interrupt an active conversation. |
| Security | Actor identity (guardian, trusted, unknown) is resolved once and enforced everywhere; unknown actors can't read memory, trigger tools, or escalate. Credentials live in a separate process and never reach the model. Every tool call runs in a sandbox. The default is to deny. |
| Channels | macOS, Windows, iOS, Web, Voice, Email, Telegram, Slack, Twilio. One assistant, one memory, every channel. |
| OAuth | Slack, Notion, Google, HubSpot, Linear, Discord, Twitter, Telegram, Twilio. No hand-rolled token refresh. |
| Hosting | Managed runtime on Vellum Platform, or self-hosted. Same codebase, same data model. |
1. Sign up or download the app
The desktop app is available for macOS and Windows. The Windows download is currently a dev build connected to the development environment, with x64 (Intel/AMD) and ARM64 installers. See the installation guide for setup and permissions.
2. Pick your mode
3. Hatch your assistant
Prefer the terminal? See CLI install below.
The CLI works but the desktop app is our primary focus. Available for advanced users, contributors, and terminal-based workflows. The Windows desktop app installs the bundled CLI for your user account on first launch; open a new terminal afterward to use vellum.
Install
bun install -g vellum
vellum hatch
Install from source
git clone https://github.com/vellum-ai/vellum-assistant.git
cd vellum-assistant
./setup.sh
source ~/.bashrc
vellum hatch
Common commands
vellum wake # start services
vellum sleep # stop services, keep data
vellum client # interact through the terminal
vellum ps # view running assistants
vellum terminal # open a shell into a managed assistant container
vellum upgrade # upgrade to latest version
All commands target the default assistant. If you have multiple, pass the assistant ID as the second argument.
Guides
| Area | Summary |
|---|---|
| Computer use | The assistant works in its own sandbox, and with your approval reaches your actual machine: reads and edits files, runs commands, drives the browser. Every action is permission-gated, and you can grant once, for ten minutes, or always. |
| Skills | Plugins defined by a SKILL.md and a TOOLS.json that add tools and prompt sections at runtime, sandboxed like everything else. Install them from the catalog, bundle them, or drop them in the workspace. |
| Channels | One assistant with one memory, reachable from the macOS or Windows app, Telegram, or Slack. Start a thought in one channel and pick it up in another. |
| Multi-provider support | Works with Anthropic, OpenAI, Google Gemini, Fireworks, OpenRouter, MiniMax, Atlas Cloud, and any OpenAI-compatible endpoint. Local models run through Ollama. Embeddings run on local ONNX by default and fall back to cloud providers automatically. |
The canonical sources for who we are and how we talk about what we're building. The docs site at vellum.ai/docs is a rendered view of these files.
| Doc | What it is |
|---|---|
| Constitution | Who we are, what we believe, and what we refuse to compromise on |
| Glossary | The shared vocabulary we use to talk about personal intelligence |
| Section | What's covered |
|---|---|
| Architecture | Platform domains, repo structure, runtime · clients · gateway |
| Security & Permissions | Sandbox, credentials, trust rules, permission modes |
| Features & Capabilities | Integrations, dynamic skills, browser, attachments, media embeds |
| API & Communication | SSE event stream, event payloads, remote access |
| Development Workflow | Claude Code commands, parallel PRs, review loops, release pipeline |
We welcome contributions from everyone.
MIT. See License. Integration logos from Simple Icons, licensed CC0 1.0.
Vellum Assistant is open-source software built by Vellum AI, a for-profit company. We also offer a managed product, the Vellum Platform, which sustains the business. Free to use and modify under MIT, and we're committed to keeping it that way.