CLI reference changedcli-reference
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6969| `--bg`, `--background` | Start the session as a [background agent](/docs/en/agent-view) and return immediately. Prints the session ID and management commands. Combine with `--exec` to run a shell command as a background job instead of a Claude session, or with `--agent` to run a specific subagent. Cannot be combined with `-p`/`--print`; see the [error reference](/docs/en/errors#command-line-errors) | `claude --bg "investigate the flaky test"` |
7070| `--channels` | (Research preview) MCP servers whose [channel](/docs/en/channels) notifications Claude should listen for in this session. Space-separated list of `plugin:<name>@<marketplace>` entries. Requires Anthropic authentication through claude.ai or a Console API key | `claude --channels plugin:my-notifier@my-marketplace` |
7171| `--chrome` | Enable [Chrome browser integration](/docs/en/chrome) for web automation and testing | `claude --chrome` |
72| `--cloud` | With a task description, create a new [web session](/docs/en/claude-code-on-the-web) on claude.ai. With a session ID (`session_...` or `cse_...`) or a claude.ai/code URL, target that existing session instead: `-p` queues the message into it, and no `-p` attaches your terminal. See [send a follow-up message](/docs/en/claude-code-on-the-web#send-follow-ups-from-the-cli). | `claude --cloud "Fix the login bug"` |
72| `--cloud` | With a task description, create a new [web session](/docs/en/claude-code-on-the-web) on claude.ai. With a session ID (`session_...` or `cse_...`) or a claude.ai/code URL, queue a message into that existing session instead, with `-p`. See [send a follow-up message](/docs/en/claude-code-on-the-web#send-follow-ups-from-the-cli). | `claude --cloud "Fix the login bug"` |
7373| `--continue`, `-c` | Load the most recent conversation in the current directory, skipping [background sessions, sessions created with `claude -p` or the Agent SDK, and sessions whose first prompt was `/loop`](/docs/en/sessions#resume-a-session). `claude -p --continue` includes `-p`, SDK, and `/loop` sessions. Includes sessions that added this directory with `/add-dir` | `claude --continue` |
7474| `--dangerously-load-development-channels` | Enable [channels](/docs/en/channels-reference#test-during-the-research-preview) that are not on the approved allowlist, for local development. Accepts `plugin:<name>@<marketplace>` and `server:<name>` entries. Prompts for confirmation | `claude --dangerously-load-development-channels server:webhook` |
7575| `--dangerously-skip-permissions` | Skip permission prompts. Equivalent to `--permission-mode bypassPermissions`. See [permission modes](/docs/en/permission-modes#skip-all-checks-with-bypasspermissions-mode) for what this does and does not skip. For sessions started with `--bg`, the mode [persists when the supervisor restarts the session](/docs/en/agent-view#permission-mode-model-and-effort) | `claude --dangerously-skip-permissions` |
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7979| `--disallowedTools`, `--disallowed-tools` | Deny rules. A bare tool name removes the matching tools from Claude's context: `"Edit"` removes Edit, `"*"` removes every tool, and `"mcp__*"` removes every MCP tool. A scoped rule such as `Bash(rm *)` leaves the tool available and denies only matching calls. A rule naming [`EndConversation`](/docs/en/tools-reference#endconversation-tool-behavior) can't remove it while any other tool remains | `"Bash(git log *)" "Bash(git diff *)" "Edit"` |
8080| `--effort` | Set the [effort level](/docs/en/model-config#adjust-effort-level) for the current session. Options: `low`, `medium`, `high`, `xhigh`, `max`, or `ultracode`. Available levels depend on the model. `ultracode` starts the session at `xhigh` effort with [ultracode](/docs/en/workflows#let-claude-decide-with-ultracode) turned on, and requires Claude Code v2.1.203 or later. Overrides the [`effortLevel`](/docs/en/settings-reference#effortlevel) setting for this session and does not persist | `claude --effort high` |
8181| `--enable-auto-mode` | Removed in v2.1.111. Auto mode is now in the `Shift+Tab` cycle by default; use `--permission-mode auto` to start in it | `claude --permission-mode auto` |
82| `--environment <environment-id>` | Create a new cloud session that runs on the [self-hosted environment](/docs/en/self-hosted-environments) with the given ID. Environment IDs start with `ccpool_`. See [`--environment` dispatch behavior](/docs/en/self-hosted-environments-testing#environment-dispatch-behavior) for the interactive and non-interactive forms and the flag combinations it rejects. Requires Claude Code v2.1.224 or later | `claude -p "Fix the login bug" --environment ccpool_abc123` |
82| `--environment <environment-id>` | Create a new cloud session that runs on the [self-hosted environment](/docs/en/self-hosted-environments) with the given ID. Environment IDs start with `ccpool_`. See [`--environment` dispatch behavior](/docs/en/self-hosted-environments-testing#environment-dispatch-behavior) for dispatch behavior and the flag combinations it rejects. Requires Claude Code v2.1.224 or later | `claude -p "Fix the login bug" --environment ccpool_abc123` |
8383| `--exclude-dynamic-system-prompt-sections` | Move per-machine sections from the system prompt (working directory, environment info, memory paths, git-repo flag) into the first user message. Improves prompt-cache reuse across different users and machines running the same task. Only applies with the default system prompt; ignored when `--system-prompt` or `--system-prompt-file` is set. Use with `-p` for scripted, multi-user workloads | `claude -p --exclude-dynamic-system-prompt-sections "query"` |
8484| `--exec` | Run a shell command as a PTY-backed background job instead of starting a Claude session. Use with `--bg` to launch from the shell | `claude --bg --exec 'pytest -x'` |
8585| `--fallback-model` | Enable automatic fallback to the specified model(s) when the primary model is overloaded or not available, for example a retired model. Accepts a comma-separated list tried in order. See [Fallback model chains](/docs/en/model-config#fallback-model-chains). To persist a chain across sessions, use the [`fallbackModel` setting](/docs/en/settings-reference#fallbackmodel), which this flag overrides | `claude --fallback-model sonnet,haiku` |
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