Vellum Assistant is a personal AI assistant that remembers information about users, learns their preferences, and takes actions across connected apps. It is intended for people who want an assistant that can manage conversations, unfinished work, and proactive notifications over time. The catalogue skills, hooks, instruction, and setting configure or extend how the assistant works.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add vellum-ai/vellum-assistant --skill vellum-browser-usegit clone --depth 1 https://github.com/vellum-ai/vellum-assistantWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/vellum-ai/vellum-assistant/vellum-browser-use)<a href="https://agentmods.dev/skills/vellum-ai/vellum-assistant/vellum-browser-use"><img src="https://agentmods.dev/badge/skills/vellum-ai/vellum-assistant/vellum-browser-use/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/vellum-ai/vellum-assistant/vellum-browser-use"><img src="https://agentmods.dev/badge/skills/vellum-ai/vellum-assistant/vellum-browser-use.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00015 | $0.02284 |
| Opus 5 | $0.00008 | $0.01142 |
| Sonnet 5 | $0.00003 | $0.00457 |
| Haiku 4.5 | $0.00002 | $0.00228 |
Grade A, and why
vellum-browser-use scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured today.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
If navigate, curl, or any fetch times out, hits an auth wall, or cannot reach a host (VPN, company login, internal dashboard): How it starts
The opening of the file, as written. The whole thing — 207 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Use this skill to browse the web. All browser operations are executed through the assistant browser CLI, invoked via bash or host_bash. Each operation is a subcommand:
| Command | Description |
|---|---|
assistant browser navigate |
Navigate to a URL |
assistant browser snapshot |
List interactive elements on the current page |
assistant browser screenshot |
Take a visual screenshot |
assistant browser click |
Click an element |
assistant browser type |
Type text into an input |
assistant browser press-key |
Press a keyboard key |
assistant browser scroll |
Scroll the page or a specific element |
assistant browser select-option |
Select an option from a native <select> element |
assistant browser hover |
Hover over an element to reveal menus/tooltips |
assistant browser wait-for |
Wait for a condition |
assistant browser extract |
Extract page text content |
assistant browser wait-for-download |
Wait for a file download to complete |
assistant browser fill-credential |
Fill a stored credential into a form field |
assistant browser attach |
Attach the Chrome debugger to the active tab |
assistant browser detach |
Detach the Chrome debugger from the active tab |
assistant browser close |
Close the browser page |
assistant browser status |
Diagnose browser backend readiness and setup steps |
Getting Started — Check Browser Readiness
Before using any browser commands, run assistant browser --json status first to check which browser backends are available. The status command returns JSON with readiness information for each backend mode:
assistant browser --json status
The response includes:
recommendedMode— the best available backend (use this)modes[]— per-mode status withavailable,summary, anduserActions(remediation steps)
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- today Changed 156d8f14b2d3
- 2d ago Changed · +11 lines c16d22b49590
- 7d ago First seen · 196 lines · 15 tokens per session scan A 7ed38008bb89
vellum-browser-use is a skill published in the GitHub repository vellum-ai/vellum-assistant (1,225 stars, last pushed today), licensed MIT. It adds 15 tokens to every session and 2,284 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
Other skills, from other repositories
ha-browser
Hope Agent browser automation — the standard status → tabs → snapshot → act loop, stale-ref recovery rules, and what to do when login / 2FA / captcha / camera-prompt / dialog blocks progress. Load this skill whenever you reach for the browser tool. Trigger on: user asks the agent to open / control / click / scrape /…
macos-use
GUI control for macOS apps via mediar-ai's mcp-server-macos-use. Click, type, scroll, key-press, open apps — driven by accessibility tree, works in non-interactive Claude Code mode. Use this for any Sutando task that needs to drive another macOS application (Safari, Zoom, Mail, Finder, etc.).
lictor-security-check
Pre-release security audit for ANY project — AI-built or hand-written, web or mobile. Scans the codebase for the full range of real-world risks that get apps breached: leaked API & AI-provider keys, exposed configs/secrets, broken auth & access control (IDOR), injection (SQL/XSS/command), SSRF, open databases & cloud…
lictor-rotate
Walks the user through rotating a leaked API key — step by step, provider-specific. Knows the exact URL to visit, the exact button to click, and how to verify the rotation worked. Supports Stripe, OpenAI, Anthropic, Google Cloud / AI Studio, GitHub, AWS, Slack, Supabase, Firebase, Postmark, and generic OAuth providers.
agent-browser
Browser automation using Vercel's agent-browser CLI. Use when you need to interact with web pages, fill forms, take screenshots, or scrape data. Alternative to Playwright MCP - uses Bash commands with ref-based element selection. Triggers on "browse website", "fill form", "click button", "take screenshot", "scrape…
anthropic-webapp-testing
Toolkit for interacting with and testing local web applications using Playwright. Supports verifying frontend functionality, debugging UI behavior, capturing browser screenshots, and viewing browser logs.