[
    {
        "role": "user",
        "content": "If%20i%20login%20to%20claude%20code%20with%20a%20claude.ai%20account%2C%20the%20login%20seems%20to%20be%20lost%20when%20i%20exit%20claude.%20can%20i%20capture%20something%20from%20the%20session%20that%20I%20can%20set%20as%20an%20environment%20variable%20so%20that%20I%20don%27t%20have%20to%20login%20each%20time%3F"
    },
    {
        "role": "assistant",
        "content": "You can avoid logging in every time to Claude Code by using an environment variable to supply authentication credentials, instead of relying on the interactive `/login` flow. Below is a breakdown of how Claude Code handles authentication and environment variables, and how you can set this up.\n\n---\n\n### How Authentication Works in Claude Code\n\n- Claude Code supports two main authentication methods:\n  1. Logging in via the CLI or UI using a claude.ai / Console account.  \n  2. Using an API key stored in an environment variable. ([support.anthropic.com](https://support.anthropic.com/en/articles/12304248-managing-api-key-environment-variables-in-claude-code?utm_source=openai))\n\n- The environment variable `ANTHROPIC_API_KEY` is recognized as a valid credential. If it is set, Claude Code **prioritizes it over an interactive login session**. That means you won\u2019t need to log in interactively every time. ([support.anthropic.com](https://support.anthropic.com/en/articles/12304248-managing-api-key-environment-variables-in-claude-code?utm_source=openai))\n\n- If `ANTHROPIC_API_KEY` is set, you may incur API charges (according to your API account), rather than using usage included in a subscription. ([support.anthropic.com](https://support.anthropic.com/en/articles/12304248-managing-api-key-environment-variables-in-claude-code?utm_source=openai))\n\n---\n\n### What \u201cSession\u201d You Might Be Losing When You Exit\n\n- The interactive login session (via `claude login` or similar) probably stores a session token or cookie in a local file. When you exit/close Claude Code, that session may expire or not persist across restarts.\n\n- Claude Code does **not** in general provide a documented environment variable for storing that login session token explicitly. Instead, the recommended method is using `ANTHROPIC_API_KEY`. ([claude-codex.fr](https://claude-codex.fr/en/reference/environment/?utm_source=openai))\n\n---\n\n### What You Can Do: Use `ANTHROPIC_API_KEY`\n\nHere\u2019s how to avoid needing to `login` each time:\n\n1. Go to the Anthropic / Claude Console and generate an **API key**. This is often labeled \u201cClaude API Key\u201d or \u201cAnthropic API Key\u201d. ([platform.claude.com](https://platform.claude.com/docs/claude/reference/getting-started-with-the-api?utm_source=openai))\n\n2. Set it in your shell environment:\n\n   ```bash\n   export ANTHROPIC_API_KEY=\"sk-ant-xxxxxxxxxxxxxx\"\n   ```\n\n   You can add this line to your shell\u2019s startup file (e.g. `~/.bashrc`, `~/.zshrc`) so it persists across sessions. ([claude-codex.fr](https://claude-codex.fr/en/reference/environment/?utm_source=openai))\n\n3. Make sure **not** to set both the interactive login *and* the key, or else Claude Code may issue a warning that multiple credentials are present, or may prioritize the API key. ([support.anthropic.com](https://support.anthropic.com/en/articles/12304248-managing-api-key-environment-variables-in-claude-code?utm_source=openai))\n\n4. Check your status by running:\n\n   ```\n   claude /status\n   ```\n\n   This will tell you **which authentication method** is active: whether Claude Code is using your subscription via login, or using the API key. ([support.anthropic.com](https://support.anthropic.com/en/articles/12304248-managing-api-key-environment-variables-in-claude-code?utm_source=openai))\n\n---\n\n### Risks / Things to Be Aware Of\n\n- Using `ANTHROPIC_API_KEY` ties usage to your API billing account. If you want to stay within the usage that comes with your subscription (Claude Pro, Max, etc.), using the login path may sometimes give different cost/limit behavior. ([support.anthropic.com](https://support.anthropic.com/en/articles/12304248-managing-api-key-environment-variables-in-claude-code?utm_source=openai))\n\n- Always keep your API key secret\u2014don\u2019t commit it to version control or share it publicly.\n\n- If the CLI or local setup relies on cookies or session-state files, losing those files (or changing directories) might still disrupt \u201cinteractive\u201d sessions. Environment variable-based auth sidesteps that dependency.\n\n---\n\n### Conclusion\n\nYes, you *can* avoid needing to login each time by using the `ANTHROPIC_API_KEY` environment variable. It serves as a persistent credential. There is **not** a supported environment variable that captures the interactive login token directly (i.e. a session cookie); the API key is the designed method for long-lived credentials.  \n\nIf you want, I can walk you through how to generate the key and securely store it, or set up multiple API keys if you have different projects/environments."
    }
]