feat: add reasoning effort commands

README.en.md

@@ -138,8 +138,12 @@ Each WhatsApp bot also has its own access mode. Existing bots migrate to **Only
 | `/new` | Unbind the current chat so its next ordinary message starts a new Harness Session. |
 | `/status` | Check the connection between the current bot and DeepSeek Harness. |
 | `/models` | List every currently configured model with a number. |
-| `/model` | Show the model used by the Session bound to this chat. |
-| `/model <number or provider/model-id>` | Switch the model for the Session bound to this chat. |
+| `/model` | Show the model and reasoning effort used by the Session bound to this chat. |
+| `/model <number or provider/model-id> [reasoning effort ID]` | Switch the Session model and optionally select an effort supported by the target model. |
+| `/reasoninglist`, `/reasonings` | Equivalent aliases that list the reasoning efforts supported by the current model. |
+| `/reasoning` | Show the current Session model and reasoning effort. |
+| `/reasoning <number or effort ID>` | Switch the current model's reasoning effort. |
+| `/reasoning --default` | Restore the current model's default reasoning effort. |
 | `/presetlist` | List the Host's currently available Agent Presets, marking the Host default and this bot's selection. |
 | `/preset` | Show this bot's Agent Preset setting for new Sessions. |
 | `/preset <number or Preset ID>` | Set this bot's Agent Preset; use `/preset id:<ID>` for a numeric ID. |
@@ -154,7 +158,7 @@ Each WhatsApp bot also has its own access mode. Existing bots migrate to **Only
 | Interactive question | Reply with an option number, option label, or custom text; separate multiple choices with commas. |
 | Remote approval | Reply with `批准` / `拒绝` / `同意` / `不同意` / `yes` / `no`. |
 
-Example: send `/models`, then `/model 2` to switch to the second model in the list; send `/presetlist`, then `/preset 2` to select the second Agent Preset for this bot. Other examples: `/help`, `/new`, `/status`, `/model deepseek-official/deepseek-v4-pro`, `/preset marketing-jeep`, `/preset --default`, `/steer inspect only the configuration file`, `/stop`, `/compact`, `/workspace /Users/alice/projects/my-app`, `/sessionlist 2`, `/sessionlist /Users/alice/projects/my-app`, or `/session session-id`
+Example: send `/models`, then `/model 2` to switch to the second model in the list; send `/reasoninglist`, then `/reasoning 2` to switch to the current model's second reasoning effort; send `/presetlist`, then `/preset 2` to select the second Agent Preset for this bot. Other examples: `/help`, `/new`, `/status`, `/model deepseek-official/deepseek-v4-pro max`, `/reasoning --default`, `/preset marketing-jeep`, `/preset --default`, `/steer inspect only the configuration file`, `/stop`, `/compact`, `/workspace /Users/alice/projects/my-app`, `/sessionlist 2`, `/sessionlist /Users/alice/projects/my-app`, or `/session session-id`
 
 If the Slack desktop app has no native Slash Command registered with the same name, it intercepts messages that begin directly with `/`. Send the command with one leading space instead, for example ` /presetlist` or ` /preset 2`; the plugin command layer trims surrounding whitespace, so it executes exactly like the unspaced form.
 
@@ -164,8 +168,9 @@ If the Slack desktop app has no native Slash Command registered with the same na
 - `/status` takes no arguments, never prompts the model, and does not change the Session binding. It confirms that the current bot can reach DeepSeek Harness.
 - `/new` only removes the current chat's saved dsh-im Session binding; it never deletes, empties, or archives the old Session. The next ordinary message creates and binds a new Session in the current workspace. If a task is running or waiting for a question or approval, finish the interaction or use `/stop` before `/new`.
 - `/models` takes no arguments and never creates a Session. It assigns a number to every currently configured Harness model and also shows its stable, copyable `provider/model-id`. If one provider fails, models from the remaining providers are still shown.
-- Bare `/model` only displays the current Session model. A model can be selected by the number or exact full ID returned by `/models`, for example `/model 2`. When the chat has no Session yet, a valid switch creates and binds a blank Session without prompting the model. The switch affects only that Session; Harness also attempts to save it as the default for future Sessions, while other existing Sessions remain unchanged.
-- A model cannot be switched while a task is running or waiting for an approval or question answer. Wait for it to finish or use `/stop` first. A Session containing images cannot switch to a model that does not accept image input.
+- Bare `/model` shows the current Session model and reasoning effort. With arguments, it accepts a number from `/models` or an exact full model ID, followed optionally by an exact reasoning effort ID published in that target model's metadata, for example `/model 2 max`. When the effort is omitted, Harness resolves the target model's current default. If the chat has no Session yet, a valid switch creates and binds a blank Session without prompting the model.
+- `/reasoninglist` and `/reasonings` are equivalent. They list the efforts from the current model's metadata and mark the current and default values. `/reasoning` shows the current value; `/reasoning <number or effort ID>` accepts a listed number or an exact metadata ID; `/reasoning --default` lets Harness resolve the current model's default again. Every `/reasoning...` command requires an existing Session and never creates one or prompts the model.
+- The model or reasoning effort cannot be changed while a task is running or waiting for an approval or question answer. Wait for it to finish or use `/stop` first. A change takes effect on the next model request and keeps Harness's default-saving semantics: Harness attempts to save the accepted model and effort as the default selection for future Sessions, while other existing Sessions remain unchanged. A Session containing images cannot switch to a model that does not accept image input.
 - `/presetlist` takes no arguments and never creates a Session. It reads the Host's currently available Agent Presets every time, showing their names, stable IDs, the Host default, and this bot's selection. A selected Preset that has been deleted or become broken is retained and marked unavailable instead of being cleared automatically. Only safe names and IDs are shown; paths, errors, and other Host internals are never exposed.
 - Bare `/preset` shows this bot's setting for future new Sessions; it does not inspect or change the current Session. With an argument, it accepts a number from the most recent `/presetlist` in this chat or an exact ID; use `/preset id:<ID>` for a numeric ID. A numbered selection resolves the ID from that displayed list and then validates it against the latest Host catalog, asking for a fresh list if it has changed.
 - `/preset --default` clears this bot's explicit override so future Sessions resolve the Host default when they are created. Explicitly selecting an ID that currently matches the Host default pins that ID instead. Following the Host default remains available even while the catalog cannot be read.