Open the Marketplace tab in Grok Build

/marketplace opens the unified extensions modal on the Marketplace tab so you can browse and install plugins from configured sources. Official: Modes and Commands, Skills, Plugins & Marketplaces.

Open the tab

1. Start or resume a Build session (grok or grok -c).
2. Run:

/marketplace

3. Browse sources, install or update plugins, then return to the session.

The same modal opens from sibling commands — they only change which tab is selected first:

Command	Tab
/marketplace	Marketplace
/plugins	Plugins
/skills	Skills
/hooks	Hooks
/mcps	MCP

Configure sources

Marketplace sources come from [[marketplace.sources]] in ~/.grok/config.toml and from ~/.grok/plugins/known_marketplaces.json. Installed marketplace plugins land under ~/.grok/plugins/marketplaces/.

From the shell you can also manage marketplace sources with the CLI:

grok plugin marketplace list
grok plugin marketplace add <source>
grok plugin marketplace remove <source>
grok plugin marketplace update

Plugin lifecycle after install uses grok plugin list|install|uninstall|update|enable|disable|details|validate — see Use skills and plugins in Grok Build.

Pitfalls

• An empty Marketplace tab usually means no sources are configured yet. Add at least one [[marketplace.sources]] entry (or a known_marketplaces entry), then reopen /marketplace.
• Claude Code marketplaces and plugins are read automatically alongside .grok/ — you do not need a second install path for those.
• Confirm discovery with grok inspect after you change sources or install a plugin.