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7474To override the key for a single invocation, pass `--api-key`. 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; the literal `default` that the SDKs accept in `ANTHROPIC_WORKSPACE_ID` for [federated token exchange](https://platform.claude.com/docs/en/manage-claude/wif-reference#environment-variables) isn't valid here.
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.
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7878```bash CLI
7979ant messages create \
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