Environment variables changedenv-vars
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9999Some behaviors have both an environment variable and a dedicated settings key, and which one Claude Code reads first differs per key. For `ANTHROPIC_MODEL` and `CLAUDE_CODE_AUTO_CONNECT_IDE`, Claude Code reads the variable first and uses the `model` or `autoConnectIde` setting only when the variable is unset. For the pair you're setting, check the variable's row below and the key's entry on the [settings reference](/docs/en/settings-reference).
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101When the same variable is set in both your shell and a settings file `env` block, the settings file value applies. Claude Code writes each `env` entry into the process environment at startup and again when the file changes, replacing the value inherited from the shell. A few variables are special-cased; the [`env` setting](/docs/en/settings-reference#env) lists the exceptions.
101When the same variable is set in both your shell and a settings file `env` block, the settings file value applies. Claude Code writes each `env` entry into the process environment, replacing the value inherited from the shell. The [`env` setting](/docs/en/settings-reference#when-claude-code-applies-env-values) says when it applies them. A few variables are special-cased; the [`env` setting](/docs/en/settings-reference#env) lists the exceptions.
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103103In a settings file you can set a variable but you can't remove one. To override a variable you can't unset, such as a stale `CLAUDE_CODE_USE_VERTEX` exported by a shell profile you don't control, set it to an empty string in the `env` block: `"CLAUDE_CODE_USE_VERTEX": ""`. Claude Code treats the empty value as unset for provider selection. Subprocesses still inherit the empty value.
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319319| `CLAUDE_CODE_PLUGIN_GIT_TIMEOUT_MS` | Timeout in milliseconds for git operations when installing or updating plugins (default: 120000). Increase this value for large repositories or slow network connections. See [Git operations time out](/docs/en/plugin-marketplaces#git-operations-time-out) |
320320| `CLAUDE_CODE_PLUGIN_KEEP_MARKETPLACE_ON_FAILURE` | Set to `1` to skip the re-clone attempt and keep using the existing marketplace cache when a `git pull` fails. Useful in offline or airgapped environments where re-cloning would fail the same way. See [Marketplace updates fail in offline environments](/docs/en/plugin-marketplaces#marketplace-updates-fail-in-offline-environments) |
321321| `CLAUDE_CODE_PLUGIN_PREFER_HTTPS` | Set to `1` to clone GitHub `owner/repo` shorthand sources over HTTPS instead of SSH. Applies to plugin install and update, and to `/plugin marketplace add` and `update`. Useful in CI runners, containers, or any environment without a configured SSH key for `github.com` |
322| `CLAUDE_CODE_PLUGIN_SEED_DIR` | Path to one or more read-only plugin seed directories, separated by `:` on Unix or `;` on Windows. Use this to bundle a pre-populated plugins directory into a container image. Claude Code registers marketplaces from these directori
322| `CLAUDE_CODE_PLUGIN_SEED_DIR` | Path to one or more read-only plugin seed directories, separated by `:` on Unix or `;` on Windows. Use this to bundle a pre-populated plugins directory into a con
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