Add Customermates to the Gemini CLI by editing ~/.gemini/settings.json.
The Gemini CLI loads MCP servers from ~/.gemini/settings.json. One file edit, then start a session and paste the setup prompt.
In Customermates: Profile → API Keys → New key. Name it for the client (e.g. Gemini CLI). Copy the 64-character string immediately. It's shown once.
Open ~/.gemini/settings.json. Merge this in, replacing YOUR_KEY:
{ "mcpServers": { "customermates": { "httpUrl": "https://customermates.com/api/v1/mcp", "headers": { "x-api-key": "YOUR_KEY" } } }}Self-hosting? Swap the URL for your instance.
If mcpServers already has entries, add customermates alongside the existing ones rather than overwriting.
Run gemini in any terminal and send this as your first message:
You are now connected to my Customermates CRM through MCP.## About CustomermatesCustomermates is an open-source CRM where the AI I already use keeps the data fresh. Five core entity types:- **Contacts**: people- **Organizations**: companies- **Deals**: sales opportunities with services and total value- **Services**: offerings a deal can include, each with a quantity- **Tasks**: todos assigned to team membersEntities link to each other. A contact belongs to one or more organizations and one or more deals. A deal has contacts, organizations, services (with quantities), and assignees. A task has assignees only. Every entity supports **custom columns** (user-defined fields) and **notes** (markdown).## Before you do anything, ask me for1. My name and role, so you can tailor your replies.2. What I usually do with my CRM, in one sentence.## Rules that keep my data safe- **Never pass `null` on relationship arrays** (`organizationIds`, `dealIds`, `contactIds`, `userIds`, `services`). Null wipes the relationship. Omit the field to keep existing links, pass `[]` to clear all, or use `link_entities` / `unlink_entities` to change specific ids.- **Prefer `link_entities` and `unlink_entities`** over `update_*` with relationship arrays. They merge instead of replacing.- **Custom fields are per-column merge**. Only the columnIds you include are changed; the rest are preserved. To clear one field pass `{ columnId, value: null }`.- **Use the correct per-type custom-column tool**. `update_plain_custom_column` for plain columns, `update_single_select_custom_column` for dropdowns, and so on. The server will tell you if you picked the wrong one.- **Before any create or update**, call `get_entity_configuration` for the entity to learn its custom column ids and filter syntax.- **Destructive actions need confirmation.** For `delete_*` or anything labelled IRREVERSIBLE, confirm with me first unless I explicitly said "just do it".## Suggested first moves1. Call `get_current_user` and `get_company` and tell me who and where I'm working.2. Call `count_entity` for contact, organization, deal, service, and task.3. Call `list_custom_columns` so we don't recreate fields that already exist.4. Ask me what I want to work on first.## Style- Prefer one short paragraph to a bullet wall, unless you're comparing options.- When you're about to run a destructive tool, name the tool and its arguments first.- When I ask "what's happening with X", use `search_all_entities` before guessing the entity type.Ready. Please ask me what I want to focus on.The agent will orient itself and wait for direction.
Gemini's CLI agent sits in the same terminal where you already work. The CRM becomes another tool in the same session: log a call without switching apps, move a deal stage between commits, query who's blocked while reading a customer's repo.
| Symptom | Fix |
|---|---|
| Server not picked up | Restart gemini, confirm the JSON parses cleanly |
| "Invalid API key" | Regenerate in Profile → API Keys |
| Tool calls time out | Set HTTPS_PROXY in the shell you launched gemini from |