# CLI, SDKs, and libraries¶
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Official tools for building with the Claude API: the ant CLI, client SDKs in seven languages, and framework-specific libraries.¶
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Anthropic provides three kinds of official tooling for building with the Claude API:¶
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- **CLI:** The `ant` command-line tool for shell scripting and interactive use.¶
- **Client SDKs:** General-purpose Messages API clients for Python, TypeScript, C#, Go, Java, PHP, and Ruby. Each SDK provides idiomatic interfaces, type safety, and built-in support for streaming, retries, and error handling.¶
- **Libraries and integrations:** Packages and compatibility layers that expose Claude inside another framework's API surface rather than the Messages API directly.¶
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<Info>¶
For the full API specification, see the [API reference](/docs/en/api/overview).¶
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## CLI¶
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<CardGroup cols={3}>¶
<Card title="ant CLI" href="/docs/en/cli-sdks-libraries/cli/quickstart">¶
Shell scripting, typed flags, response transforms¶
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</CardGroup>¶
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## Client SDKs¶
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<CardGroup cols={3}>¶
<Card title="Python" href="/docs/en/cli-sdks-libraries/sdks/python">¶
Sync and async clients, Pydantic models¶
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<Card title="TypeScript" href="/docs/en/cli-sdks-libraries/sdks/typescript">¶
Node.js, Deno, Bun, and browser support¶
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<Card title="C#" href="/docs/en/cli-sdks-libraries/sdks/csharp">¶
.NET Standard 2.0+, IChatClient integration¶
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<Card title="Go" href="/docs/en/cli-sdks-libraries/sdks/go">¶
Context-based cancellation, functional options¶
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<Card title="Java" href="/docs/en/cli-sdks-libraries/sdks/java">¶
Builder pattern, CompletableFuture async¶
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<Card title="PHP" href="/docs/en/cli-sdks-libraries/sdks/php">¶
Value objects, builder pattern¶
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<Card title="Ruby" href="/docs/en/cli-sdks-libraries/sdks/ruby">¶
Sorbet types, streaming helpers¶
</Card>¶
</CardGroup>¶
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## Libraries and integrations¶
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Libraries and integrations expose Claude through another framework's API surface. They are not general-purpose Messages API clients.¶
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<CardGroup cols={3}>¶
<Card title="Apple Foundation Models" href="/docs/en/cli-sdks-libraries/libraries/apple-foundation-models">¶
Swift package for Apple's `LanguageModelSession` API¶
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<Card title="OpenAI SDK compatibility" href="/docs/en/cli-sdks-libraries/libraries/openai-sdk">¶
Use Claude through the OpenAI SDK surface¶
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</CardGroup>