MCP servers · Mailchimp · MCP server
Connect Codex CLI to Mailchimp
One line gives Codex CLI your Mailchimp account as tools: 12 endpoints, audiences, members, campaigns, called with your own connection. No key in the prompt, a receipt for every call, revoke Codex CLI's access alone any time.
Three steps
- Create a free 0n3 account and connect Mailchimp. Paste a key or sign in; it lands in your vault, encrypted.
- Install 0n3 into Codex CLI. OpenAI's terminal agent reads 0n3 over Streamable HTTP with a token from your environment.
- Ask Codex CLI: whoami. Then: "List audiences in Mailchimp".
Put the token in your environment
export ON3_TOKEN="<your 0n token>"
Add it to your shell profile so Codex finds it next time.
The line above carries a placeholder; 0n3.app/install mints a real key named for Codex CLI and fills it in.
What Codex CLI can then do in Mailchimp
Audiences · View and manage audiences/lists2
List audiences
GET /listsGet an audience
GET /lists/{listId}Members · Add and manage subscribers4
Add a member
POST /lists/{listId}/membersUpdate a member
PATCH /lists/{listId}/members/{subscriberHash}List members
GET /lists/{listId}/membersSearch members
GET /search-membersCampaigns · Create and send email campaigns4
List campaigns
GET /campaignsCreate a campaign
POST /campaignsSend a campaign
POST /campaigns/{campaignId}/actions/sendGet a campaign report
GET /reports/{campaignId}Templates · View email templates1
List templates
GET /templatesMore · Everything else this app exposes.1
List automations
GET /automationsMailchimp in other AI clients
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