CLI reference changedcli-reference
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7777| `--debug` | Enable debug mode with optional category filtering, such as `--debug='mcp,startup'` or `--debug='!1p'`. The filter binds only in the `=` form; a space-separated filter enables debug mode without filtering | `claude --debug='mcp,startup'` |
7878| `--debug-file <path>` | Write debug logs to a specific file path. Implicitly enables debug mode. Takes precedence over `CLAUDE_CODE_DEBUG_LOGS_DIR` | `claude --debug-file /tmp/claude-debug.log` |
7979| `--disable-slash-commands` | Disable all skills and commands for this session | `claude --disable-slash-commands` |
80| `--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"` |
80| `--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 calls that match [as written](/docs/en/permissions#bash-rule-limits). 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"` |
8181| `--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 [`modelSettings`](/docs/en/settings-reference#modelsettings) and [`effortLevel`](/docs/en/settings-reference#effortlevel) settings for this session and does not persist | `claude --effort high` |
8282| `--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` |
8383| `--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` |
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