Install and your first session

What you'll get

By the end of this chapter Marg is installed as a Claude Code plugin, your business profile is captured so every future request arrives with context, and your first deliverable is sitting in chat. Budget about 15 minutes. The only prerequisite is a working Claude Code, which claude --version confirms in a second.

The steps

1. Add the Marg marketplace. Inside any Claude Code session, type:

/plugin marketplace add ishwarjha/marg-claude

2. Install the plugin.

/plugin install marg@marg-marketplace

That single command registers the full agent roster, every /marg: command, the safety hooks, and the bundled skills. Nothing to clone, nothing to wire by hand, because the plugin carries all of it.

3. Verify. Type /marg: and the command list should appear. Once it does, you are installed, and the next step is to introduce your business so the routing has something to work with.

4. Tell Marg about your business.

/marg:onboard

Marg asks seven short questions, one at a time: what you are building, your stage, B2B or B2C, revenue range, team size, biggest challenge, and your competitive landscape. The answers are saved to a profile file in your working folder, where every later request reads them. Doing this before your first real ask is what separates advice for "a startup" from advice for yours, so it is worth the three minutes now.

5. Make your first request.

/marg:route What should we prioritize this quarter to grow revenue?

What comes back

A report lands in chat from whichever team Marg routed to, and it follows the shape chapter 2 described: the finding first, the evidence grade, then the next moves worth taking. On day one, with no tools connected, that grade reads MEDIUM, which is expected. It means the team reasoned from your onboarding answers and your request rather than from live data, and the thinking can still be sharp. Connect a tool later and the same question comes back HIGH.

Variations

• Update later: /plugin update marg@marg-marketplace pulls the newest roster and commands whenever you want them.
• Connect your tools now: if you want HIGH-grade answers from the first session, jump to chapter 24 and come back here.
• Installing from source: engineers who prefer a clone can follow the QUICKSTART in the GitHub repo, but the plugin path above is the supported route for everyone else.

If something goes wrong

• Commands do not appear: restart Claude Code, since plugin registration loads at startup.
• "Agent not found" on your first request: the install did not finish. Reinstall the plugin, then restart.
• You answered onboarding wrong: run /marg:onboard again, and it rewrites the profile cleanly rather than patching it.