Vellum (vellum.ai) launched Plugin Hub in July 2026, a free, open-source catalog of plugins for its local-first AI assistant, Vellum Assistant. The system lets users extend the assistant with specialized capabilities while keeping credentials on-device and reducing token costs.
July 9, 2026 · Vellum
Plugin Hub: an open catalog for a local-first AI assistant
Vellum opens a free, open-source marketplace of plugins for its Vellum Assistant — adding specialized roles that keep credentials on-device and cut token costs, with no restart required.
Free
All plugins are free & open source
3
Bundled elements: skills + tools + hooks
16
Skills in the official Marketing Expert plugin
4
Platforms: Mac · iOS · Web · self-hosted
One package, three parts
Each TypeScript plugin bundles everything the assistant needs to take on a new role.
Skills
Markdown bundles of instructions, examples & checklists
+
Tools
Function calls that do the work with dedicated logic
+
Hooks
Code that runs at points in the assistant's lifecycle
From install to running — in seconds
Install from the marketplace or a GitHub URL; plugins take effect immediately without a restart.
Browse
Marketplace or GitHub
→
Install
TypeScript package
→
Security by design
Credentials for email, banking or repositories stay on-device — never sent to the model.
Local credentials
Secrets stay on the device, off the model
Team-verified
Plugins vetted before distribution
Permission-gated
One-time · 10-minute · always access
What stands out
Credentials never leave the device
Token savings via dedicated tools
Free & open-source catalog
Praised for support and fast iteration
Still open questions
Just launched — long-term reviews limited
Installation ease still being assessed
Polish of individual plugins varies
Depends on community contributions
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