OpenAI Codex - SendKit

OpenAI Codex is OpenAI’s CLI agent for software development. You can connect it to SendKit’s MCP server to manage your email infrastructure with natural language.

Prerequisites

Codex CLI installed (npm install -g @openai/codex)
A SendKit API key with Full permission

Setup

Set your API key as an environment variable

Add your SendKit API key to your shell profile (~/.zshrc, ~/.bashrc, etc.):

export SENDKIT_API_KEY="sk_your_api_key_here"

Replace sk_your_api_key_here with your actual API key from the SendKit dashboard.

Open the configuration file

Edit ~/.codex/config.toml and add the SendKit server:

[mcp_servers.sendkit]
url = "https://mcp.sendkit.dev/sendkit"
bearer_token_env_var = "SENDKIT_API_KEY"

Restart Codex

Close and reopen Codex to load the new configuration.

Verify the connection

Ask Codex to interact with your SendKit account:

List all my SendKit domains

Codex uses TOML for configuration (not JSON). It provides bearer_token_env_var to securely reference API keys from environment variables instead of hardcoding them in the config file.

Example prompts

Send a test email from support@mydomain.com to test@example.com

Create a segment called "Active Users" filtering emails containing @company.com

Show me all contacts on the "Newsletter" list

OpenCode Antigravity

​Prerequisites

​Setup

​Example prompts

Prerequisites

Setup

Example prompts