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csharp changedcli-sdks-libraries/sdks/csharp

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409409### OpenTelemetry tracing
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411When your application adds the SDK’s sources to its OpenTelemetry tracer provider with `AddSource("com.anthropic.sdk.csharp*")`, the SDK emits a span for each request that it sends. To send the spans to your observability platform, see [Set up OpenTelemetry with the Claude SDK](https://platform.claude.com/docs/en/manage-claude/opentelemetry/sdk).
411When your application adds the SDK’s sources to its OpenTelemetry tracer provider with `AddSource("com.anthropic.sdk.csharp*")`, the SDK emits a span for each request that it sends. To send the spans to your observability platform, see [Set up OpenTelemetry with the Anthropic SDK](https://platform.claude.com/docs/en/manage-claude/opentelemetry/sdk).
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413413### Undocumented API functionality
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419419<Note>
420420 For detailed platform setup guides with code examples, see:
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422 * [Amazon Bedrock](https://platform.claude.com/docs/en/build-with-claude/claude-in-amazon-bedrock)
423 * [Amazon Bedrock (Opus 4.6 and earlier)](https://platform.claude.com/docs/en/build-with-claude/claude-on-amazon-bedrock-legacy)
422 * [Amazon Bedrock (`bedrock-mantle`)](https://platform.claude.com/docs/en/build-with-claude/claude-in-amazon-bedrock)
423 * [Amazon Bedrock (`bedrock-runtime`)](https://platform.claude.com/docs/en/build-with-claude/claude-on-amazon-bedrock-legacy)
424424 * [Claude Platform on AWS](https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws)
425425 * [Claude Models on Google Cloud (Google managed)](https://platform.claude.com/docs/en/build-with-claude/claude-models-on-google-cloud/google-managed)
426426 * [Microsoft Foundry](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry)
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431431The C# SDK supports the following platforms through separate NuGet packages:
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433433* **Claude Models on Google Cloud (Google managed):** `Anthropic.Vertex`. See [Claude Models on Google Cloud (Google managed)](https://platform.claude.com/docs/en/build-with-claude/claude-models-on-google-cloud/google-managed) for client setup.
434* **Bedrock:** `Anthropic.Bedrock`. Use `AnthropicBedrockMantleClient` for the Messages-API Bedrock endpoint, or `AnthropicBedrockClient` (`bedrock-runtime` path). `AnthropicBedrockMantleClient` takes an optional `MantleAwsClientOptions` config object; `AnthropicBedrockClient` accepts `AnthropicBedrockCredentialsHelper.FromEnv()` or explicit credentials.
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435* **Bedrock:** `Anthropic.Bedrock`. Which client you use depends on the endpoint:
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437 * **`bedrock-mantle`:** `AnthropicBedrockMantleClient`. It takes an optional `MantleAwsClientOptions` config object.
438 * **`bedrock-runtime`:** `AnthropicBedrockClient`, for the `InvokeModel` API. It accepts `AnthropicBedrockCredentialsHelper.FromEnv()` or explicit credentials.
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435440* **Claude Platform on AWS:** `Anthropic.Aws`. Use `AnthropicAwsClient`; set `WorkspaceId` on the client or the `ANTHROPIC_AWS_WORKSPACE_ID` environment variable (see [Workspaces](https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws#workspaces)). Available in beta.
436* **Foundry:** `Anthropic.Foundry`. Use `AnthropicFoundryClient` with `DefaultAnthropicFoundryCredentials.FromEnv()` or explicit credentials.
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438Use `AnthropicBedrockMantleClient` for new projects; `AnthropicBedrockClient` remains for existing applications using the Bedrock `InvokeModel` API.
442* **Foundry:** `Anthropic.Foundry`. Use `AnthropicFoundryClient` with `DefaultAnthropicFoundryCredentials.FromEnv()` or explicit credentials.
439443 
440444The C# SDK also supports Claude Models on Google Cloud (Anthropic managed) through `AnthropicGoogleCloudClient`, from the `Anthropic.GoogleCloud` package. This client is in beta. Set `WorkspaceId` on an optional `GoogleCloudClientOptions` value, or set the `ANTHROPIC_GOOGLE_CLOUD_WORKSPACE_ID` environment variable. See [Project, location, and workspace resolution](https://platform.claude.com/docs/en/build-with-claude/claude-models-on-google-cloud/anthropic-managed#project-location-and-workspace-resolution).
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