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7474To 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 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.
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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105105 (active) * Workspace wrkspc_01... (Engineering)
106106```
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108Read the `(active)` rows to see which credential source and workspace won. The command reports status rather than performing a health check, so don't script against the exit status. For the full ordering of credential sources, see [Credential precedence](https://platform.claude.com/docs/en/manage-claude/wif-reference#credential-precedence).
108Read the `(active)` rows to see which credential source and workspace won. The command reports status rather than performing a health check, so don’t script against the exit status. For the full ordering of credential sources, see [Credential precedence](https://platform.claude.com/docs/en/manage-claude/wif-reference#credential-precedence).
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110110## Switch between workspaces
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