Document selectable Auto approval classifier model for Deep Agents Code

src/oss/deepagents/code/approval-modes.mdx

@@ -137,6 +137,59 @@ flowchart TD
 ```
 </Accordion>
 
+### Select a classifier model
+
+By default, the Auto classifier uses the same model as the main agent. You can point it at a different (typically cheaper and faster) model to reduce cost and latency during Auto review without affecting the model used for your actual tasks.
+
+Set the classifier model through any of these source:
+
+<Tabs>
+    <Tab title="TUI command">
+        Run `/auto model` to open the interactive model picker and select a classifier model for the current session. To specify a model directly, pass it as an argument:
+
+        ```txt
+        /auto model openai:gpt-5.6-luna
+        /auto model clear
+        ```
+
+        Use `/auto model clear` to go back to inheriting the main model.
+    </Tab>
+    <Tab title="CLI flag">
+        ```bash
+        dcode -y --auto-classifier-model openai:gpt-5.6-luna
+        ```
+
+        `--auto-classifier-model` is only accepted in interactive TUI sessions.
+    </Tab>
+    <Tab title="Environment variable">
+        ```bash
+        export DEEPAGENTS_CODE_AUTO_CLASSIFIER_MODEL="openai:gpt-5.6-luna"
+        ```
+
+        <Warning>
+            A **project `.env`** cannot set `DEEPAGENTS_CODE_AUTO_CLASSIFIER_MODEL`. Only shell exports, `~/.deepagents/.env`, the CLI flag, and `/auto model` work.
+        </Warning>
+    </Tab>
+    <Tab title="config.toml">
+        ```toml title="~/.deepagents/config.toml"
+        [models]
+        auto_classifier = "openai:gpt-5.6-luna"
+        ```
+    </Tab>
+</Tabs>
+<br />
+<Accordion title="Precedence order">
+    1. **`/auto model` TUI command**: takes effect immediately for the current session.
+    2. **`--auto-classifier-model` flag**: sets the classifier on launch (interactive TUI sessions only).
+    3. **`DEEPAGENTS_CODE_AUTO_CLASSIFIER_MODEL` environment variable**: applies at startup.
+    4. **`[models].auto_classifier` in `config.toml`**: your persistent default.
+    5. **Inherit**: uses the main agent model (the default when nothing is configured).
+
+    A blank value at any level means "inherit from the next source". For example, an unset env var falls through to `config.toml`.
+</Accordion>
+
+The TUI displays which model is reviewing when Auto turns on and inside `/auto model` output.
+
 ### Revalidate before side effects
 
 The decision plan is bound to the thread, mode, batch, and exact gated calls. Missing or invalid state, a mode race, or a replay falls back to human review. For example, if you switch to Manual while classifier review is in progress, an earlier Auto decision cannot execute silently; the normal approval UI opens instead.

src/oss/deepagents/code/cli-reference.mdx

@@ -318,6 +318,7 @@ Run OAuth login for MCP servers marked `auth: "oauth"` with `dcode mcp login <se
 | `--no-stream`          | Buffer the full response and write to stdout at once instead of streaming. Requires `-n` or piped stdin |
 | `--stdin`              | Read input from stdin explicitly instead of auto-detection. Errors clearly when stdin is unavailable or is a TTY |
 | `-y`, `--auto-approve` | Enable classifier-backed [Auto](/oss/deepagents/code/approval-modes) mode. Requires an interactive local session; toggle with `Shift+Tab` during an interactive session |
+| `--auto-classifier-model MODEL` | Model used by the [Auto classifier](/oss/deepagents/code/approval-modes#select-a-classifier-model) to review gated tool calls (`provider:model` format). Overrides `DEEPAGENTS_CODE_AUTO_CLASSIFIER_MODEL` and `[models].auto_classifier` in `config.toml`. Interactive TUI sessions only |
 | `--yolo` | Run gated actions without review after the one-time local risk acknowledgement. Interactive mode only |
 | `-S`, `--shell-allow-list LIST` | Comma-separated shell commands to auto-approve, `'recommended'` for safe defaults, or `'all'` to allow any command. Applies to both `-n` and interactive modes |
 | `--allow-fs-tools LIST` | Filesystem tools to expose. Defaults to `all`. See [Restrict filesystem tools](#restrict-filesystem-tools) |

src/oss/deepagents/code/config-file.mdx

@@ -17,10 +17,13 @@ description: Configure model providers, defaults, retries, and gateways in confi
 [models]
 default = "ollama:qwen3:4b"             # your intentional long-term preference
 recent = "google_genai:gemini-3.6-flash"   # last /model switch (written automatically)
+auto_classifier = "openai:gpt-5.6-luna"  # optional: cheaper model for Auto approval review
 ```
 
 `[models].default` always takes priority over `[models].recent`. The `/model` command only writes to `[models].recent`, so your configured default is never overwritten by mid-session switches. To remove the default, use `/model --default --clear` or delete the `default` key from the config file.
 
+`[models].auto_classifier` sets the model used by the [Auto approval classifier](/oss/deepagents/code/approval-modes#select-a-classifier-model) to review gated tool calls. When unset, the classifier inherits the main agent model. You can override this at runtime with `--auto-classifier-model` or `/auto model`. See [Select a classifier model](/oss/deepagents/code/approval-modes#select-a-classifier-model) for full precedence and security notes.
+
 ## Default and recent agent
 
 ```toml