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40| [`/mcp`](#list-mcp-tools-with-mcp) | List configured Model Context Protocol (MCP) tools. | Check which external tools Codex can call during the session. |40| [`/mcp`](#list-mcp-tools-with-mcp) | List configured Model Context Protocol (MCP) tools. | Check which external tools Codex can call during the session. |
41| [`/mention`](#highlight-files-with-mention) | Attach a file to the conversation. | Point Codex at specific files or folders you want it to inspect next. |41| [`/mention`](#highlight-files-with-mention) | Attach a file to the conversation. | Point Codex at specific files or folders you want it to inspect next. |
42| [`/model`](#set-the-active-model-with-model) | Choose the active model (and reasoning effort, when available). | Switch between general-purpose models (`gpt-4.1-mini`) and deeper reasoning models before running a task. |42| [`/model`](#set-the-active-model-with-model) | Choose the active model (and reasoning effort, when available). | Switch between general-purpose models (`gpt-4.1-mini`) and deeper reasoning models before running a task. |
4343| [`/fast`](#toggle-fast-mode-with-fast) | Toggle Fast mode for GPT-5.4. | Turn Fast mode on or off, or check whether the current thread is using it. || [`/fast`](#toggle-fast-mode-with-fast) | Toggle Fast mode for supported models. | Turn Fast mode on or off, or check whether the current thread is using it. |
44| [`/plan`](#switch-to-plan-mode-with-plan) | Switch to plan mode and optionally send a prompt. | Ask Codex to propose an execution plan before implementation work starts. |44| [`/plan`](#switch-to-plan-mode-with-plan) | Switch to plan mode and optionally send a prompt. | Ask Codex to propose an execution plan before implementation work starts. |
45| [`/personality`](#set-a-communication-style-with-personality) | Choose a communication style for responses. | Make Codex more concise, more explanatory, or more collaborative without changing your instructions. |45| [`/personality`](#set-a-communication-style-with-personality) | Choose a communication style for responses. | Make Codex more concise, more explanatory, or more collaborative without changing your instructions. |
46| [`/ps`](#check-background-terminals-with-ps) | Show experimental background terminals and their recent output. | Check long-running commands without leaving the main transcript. |46| [`/ps`](#check-background-terminals-with-ps) | Show experimental background terminals and their recent output. | Check long-running commands without leaving the main transcript. |