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44description: Authenticate the ant CLI with interactive login, API keys, named profiles, and Workload Identity Federation.
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7The `ant` CLI supports several credential sources. The [Quickstart](https://platform.claude.com/docs/en/cli-sdks-libraries/cli/quickstart#authentication) covers the one-command happy path (`ant auth login`). This page covers every option in full.
7The `ant` CLI supports several credential sources. The [Quickstart](https://platform.claude.com/docs/en/cli-sdks-libraries/cli/quickstart#authentication) covers the one-command login (`ant auth login`). This page covers every option in full.
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99## Interactive login
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74To override the key for a single invocation, pass [`--api-key-stdin`](https://platform.claude.com/docs/en/cli-sdks-libraries/cli/using#global-flags) and pipe the key to the command. To point at a different API host, set `ANTHROPIC_BASE_URL` or pass `--base-url`.
74To override the key for a single run, pass [`--api-key-stdin`](https://platform.claude.com/docs/en/cli-sdks-libraries/cli/using#global-flags) and pipe the key to the command. To point at a different API host, set `ANTHROPIC_BASE_URL` or pass `--base-url`.
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76If you are using an API key scoped to multiple workspaces, such as a [personal or service account key](https://platform.claude.com/docs/en/manage-claude/authentication#key-types), you must [specify the workspace](https://platform.claude.com/docs/en/manage-claude/authentication#select-a-workspace) to run your command in. Do this by setting an `ANTHROPIC_WORKSPACE_ID` environment variable, which the CLI reads automatically, or by using the [`--workspace-id` flag](https://platform.claude.com/docs/en/cli-sdks-libraries/cli/using#global-flags). The value must be a `wrkspc_...` ID.
76If you are using a [personal or service account key](https://platform.claude.com/docs/en/manage-claude/authentication#key-types) that isn't scoped to a workspace, you must [specify the workspace](https://platform.claude.com/docs/en/manage-claude/authentication#select-a-workspace) to run your command in. Do this by setting an `ANTHROPIC_WORKSPACE_ID` environment variable, which the CLI reads automatically, or by using the [`--workspace-id` flag](https://platform.claude.com/docs/en/cli-sdks-libraries/cli/using#global-flags). The value must be a `wrkspc_...` ID.
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7878```bash CLI
7979ant messages create \
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154154 <Card title="CLI scripting and automation" icon="code" href="https://platform.claude.com/docs/en/cli-sdks-libraries/cli/scripting">
155 Version-control API resources, scripting patterns, and use from Claude Code
155 Version control for API resources, scripting patterns, and use from Claude Code
156156 </Card>
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158158 <Card title="Workload Identity Federation" icon="cloud" href="https://platform.claude.com/docs/en/manage-claude/workload-identity-federation">
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