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Supported Gemini surfaces

This guide applies to Gemini CLI, Google’s command-line tool for developers. Gemini on the web (gemini.google.com), the Gemini mobile apps, and Gemini in Google Workspace apps do not currently support MCP. They run in environments that don’t yet support custom MCP server connections; only the Gemini CLI can launch MCP processes. No configuration will make MCP work on those surfaces. Watch the Gemini changelog for changes.

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Prerequisites

Affinity
  • Plan: Scale, Advanced, or Enterprise (required for API and MCP access).
  • API key: Generate one first. See Authentication. Gemini does not currently support OAuth with Affinity.
  • Admin setup: None required by default. If an Affinity admin has disabled Gemini under Settings → Affinity MCP, ask them to re-enable it.
Gemini
  • Plan: A Google account with Gemini CLI access. Each developer configures their own CLI install.
  • Admin setup: None.
Get an Affinity API key in 3 steps: In Affinity, go to Settings → Manage Apps → API Keys → Create new key. Copy the key immediately — you won’t see it again. Name it something memorable (e.g., “Gemini MCP”).

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Setup

Run the following command in Gemini CLI with your API key filled in: 
gemini mcp add --transport http \
    --header "Authorization: Bearer your_api_key_here" \
    affinity-mcp https://mcp.affinity.co/mcp

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Test your connection

Once configured, try one of these in Gemini CLI:
  • Find 3 companies I emailed in the last 30 days.
  • Show me my upcoming meetings.
  • Summarize recent activity on Acme Corp.
If Affinity data comes back, you’re set. If not, see Troubleshooting.