AI Assistant Plugins — Browse & Install Plugins for Your AI Agent | Vellum
FAQs
What are AI plugins?
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An AI plugin extends your AI assistant with new capabilities — hooks, tools, and skills that run locally on your machine. Each plugin is a self-contained GitHub repo you install with a single command. Vellum plugins can compress the assistant's output, log your workouts, manage your calendar, and much more.
How do I install an AI plugin?
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Three ways, all one step. Browse and install from the Plugins tab inside the Vellum app, send your assistant the plugin's GitHub link or its page on this hub and ask it to install, or run the CLI command from any plugin's page: assistant plugins install <name>. No build step, no config file to edit.
How do I use a plugin once it's installed?
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You don't have to do anything — just talk to your assistant like normal. Each plugin describes what it can do, and the assistant reads those descriptions and picks the right tool or skill when your request calls for it. Ask to search your Drive and a Drive plugin answers; ask for a workout log and a fitness plugin steps in. No commands to memorize, no menus to dig through.
How are Vellum plugins different from Claude plugins?
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Claude plugins and Claude code plugins run inside Anthropic's closed ecosystem — your plugin only works within Claude, and you're bound by Anthropic's terms. Vellum plugins are open source and portable: the source lives on GitHub, installs are pinned to a reviewed commit, and your credentials never reach the model. The same plugin runs across macOS, Slack, and Telegram with shared memory.
What's the difference between a skill and a plugin?
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A skill is a single packaged capability. A plugin is broader: it can bundle skills together with hooks and tools that wire more deeply into the assistant. Skills ship inside Vellum; plugins are community and partner extensions distributed through this directory and installed from their own repos.
Are AI plugins free?
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Yes. Every plugin in the directory is open source and free to install. Some plugins call third-party APIs that may have their own costs, but the plugin itself never costs anything.
Is it safe to install a plugin?
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Plugins in this directory are reviewed by the Vellum team, install from a pinned commit, and run inside Vellum's sandbox with per-actor permissions. Your credentials live in a separate process and never reach the model. You can also read every line of source on GitHub before installing.
Where does a plugin's code live?
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In its own GitHub repo. Each plugin page links straight to the source at the exact commit it installs from, so you can inspect the scripts it runs and its full history before and after you install.
What happens when a plugin updates?
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You stay on the version you installed until you choose to update, because installs are pinned to a specific commit. When you update, you can see exactly what changed in the repo first.
Can I build my own plugin?
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Absolutely. A plugin is a repo with a package.json manifest plus the hooks, tools, and skills it contributes. The simple-memory plugin is the reference implementation and exercises every wired surface — start there. Read the docs.
Can a plugin access my data or credentials?
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Only what you allow. Plugins run under Vellum's permission system: high-risk actions require your explicit confirmation, network access goes through an outbound proxy, and secrets are collected through a secure prompt that never exposes them to the model.
How do I remove a plugin?
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Ask your assistant to uninstall it, or run assistant plugins uninstall <name>. Plugins are self-contained, so removing one leaves the rest of your setup untouched.
Give your AI assistant new capabilities
Plugins give your assistant superpowers. One-click install and its go time!
Featured Plugins
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Marketing ExpertMarketing
Acts as a full-stack marketing expert for any business (B2B or B2C): an on-demand persona plus playbook skills (positioning, demand planning, launches, content & copywriting, brand voice, email sequences, SEO & GEO, competitive teardown, board reporting) and deterministic funnel/positioning/GTM/competitive tools.
🧑💼
Admin CopilotProductivity
Proactive chief-of-staff: a morning digest, propose-then-confirm inbox triage, calendar prep, and a weekly competitor brief.
🚦
Model RouterProductivity
Routes each user-facing message to one of your workspace's inference profiles, so model selection can vary per call instead of staying pinned to a single profile.
🧠
Simple MemoryMemory
Reference memory plugin that exercises the full plugin API with low-cost variants of Vellum's memory defaults.
💻
Dynamic NotchInterface
Put your Vellum assistant inside your MacBook's notch: click to chat, hold Ctrl+Option to talk, and get a floating task bulb while it works, with live-streamed replies and per-sentence voice.
🦴
CavemanProductivity
Ultra-compressed communication mode that strips filler words to cut token usage.
🆙
Level UpDeveloper
Surfaces a first-class "Level Up" diff card whenever the assistant edits its own skills or plugins, so you can see how it improved itself after the fact.
💪
Fitness CompanionHealth
Fitness and nutrition companion. Logs meals, workouts, and weight; looks up nutrition data from OpenFoodFacts; calculates macro targets; and injects daily fitness context into every conversation.
✍️
Writing CoachHobby
A writing coach in your pocket. Daily prompts that escalate with your streak, savage-but-constructive draft roasts, query letter critiques, and a word count enforcer that guilt-trips you when you skip.
🔀
Git WorkflowDeveloper
Git workflow tools and multi-perspective code review: branch management, push, stash, PR creation/review/merge/checkout, diffs, logs, changelog generation, and parallel subagent code review with confidence scoring.
