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HomeDocsClaude Code CLI 24 Sep 2026
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Quickstart changedagent-sdk/quickstart

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Upstream edited this page at 24 Sep 2026 22:41 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 24 Sep 2026 23:07 UTC.

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261261This is what makes the Agent SDK different: Claude executes tools directly instead of asking you to implement them.
262262 
263263<Note>
264 If you see an authentication error such as `Not logged in` or `Invalid API key`, make sure you've set the `ANTHROPIC_API_KEY` environment variable in the shell where you run your agent. The SDK doesn't load `.env` files automatically. See the [full troubleshooting guide](/docs/en/troubleshooting) for more help.
264 If you see an authentication error such as `Not logged in` or `Invalid API key`, make sure you've set the `ANTHROPIC_API_KEY` environment variable in the shell where you run your agent. The SDK doesn't load `.env` files automatically.
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266 For the causes and fixes behind these and other authentication errors, see [Authentication errors](/docs/en/errors#authentication-errors) in the Error reference.
265267</Note>
266268 
267269### Try other prompts
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363365* **[MCP servers](/docs/en/agent-sdk/mcp)**: connect to databases, browsers, APIs, and other external systems
364366* **[Hosting](/docs/en/agent-sdk/hosting)**: deploy agents to Docker, cloud, and CI/CD
365367* **[Example agents](https://github.com/anthropics/claude-agent-sdk-demos)**: see complete examples: email assistant, research agent, and more
366* **[Troubleshooting](/docs/en/agent-sdk/troubleshooting)**: fix Agent SDK errors by the exact message you see
368* **[Troubleshooting](/docs/en/agent-sdk/troubleshooting)**: fix errors when the CLI fails to start or exits, or a result arrives without structured output
367369 
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