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422422| `debug` | `boolean` | `false` | Enable debug mode for the Claude Code process |
423423| `debugFile` | `string` | `undefined` | Write debug logs to a specific file path. Implicitly enables debug mode |
424424| `disallowedTools` | `string[]` | `[]` | Tools to deny. A bare name such as `"Bash"` removes the tool from Claude's context. A scoped rule such as `"Bash(rm *)"` leaves the tool available and denies matching calls in every permission mode, including `bypassPermissions`, for the command [as written](/docs/en/permissions#bash-rule-limits). See [Permissions](/docs/en/agent-sdk/permissions#allow-and-deny-rules) |
425| `effort` | `'low' \| 'medium' \| 'high' \| 'xhigh' \| 'max'` | Model default | Controls how much effort Claude puts into its response. Works with adaptive thinking to guide thinking depth. See [adjust the effort level](/docs/en/model-config#adjust-effort-level) |
425| `effort` | `'low' \| 'medium' \| 'high' \| 'xhigh' \| 'max'` | `undefined` | Controls how much effort Claude puts into its response. Works with adaptive thinking to guide thinking depth. See [adjust the effort level](/docs/en/model-config#adjust-effort-level) |
426426| `enableFileCheckpointing` | `boolean` | `false` | Enable file change tracking for rewinding. See [File checkpointing](/docs/en/agent-sdk/file-checkpointing) |
427427| `env` | `Record<string, string \| undefined>` | `process.env` | Environment variables. When set, this replaces the subprocess environment instead of merging with `process.env`, so pass `{ ...process.env, YOUR_VAR: 'value' }` to keep inherited variables like `PATH`. See [Handle slow or stalled API responses](#handle-slow-or-stalled-api-responses) for an example of this pattern, and [Environment variables](/docs/en/env-vars) for variables the underlying CLI reads. Set `CLAUDE_AGENT_SDK_CLIENT_APP` to identify your app in the User-Agent header |
428428| `executable` | `'bun' \| 'deno' \| 'node'` | Auto-detected | JavaScript runtime to use |