Quickstart changedagent-sdk/quickstart
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261261This is what makes the Agent SDK different: Claude executes tools directly instead of asking you to implement them.
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263263<Note>
264 If you see "API key not found", 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. See the [full troubleshooting guide](/docs/en/troubleshooting) for more help.
265265</Note>
266266
267267### Try other prompts
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