feat: Added support for modifying the reasoning effort of reasoning models

src/config/agent.rs

@@ -575,6 +575,10 @@ impl RoleLike for Agent {
         self.config.top_p
     }
 
+    fn reasoning_effort(&self) -> Option<String> {
+        self.config.reasoning_effort.clone()
+    }
+
     fn enabled_tools(&self) -> Option<Vec<String>> {
         None
     }
@@ -596,6 +600,10 @@ impl RoleLike for Agent {
         self.config.top_p = value;
     }
 
+    fn set_reasoning_effort(&mut self, value: Option<String>) {
+        self.config.reasoning_effort = value;
+    }
+
     fn set_enabled_tools(&mut self, value: Option<Vec<String>>) {
         match value {
             Some(tools) => {
@@ -637,6 +645,8 @@ pub struct AgentConfig {
     #[serde(skip_serializing_if = "Option::is_none")]
     pub top_p: Option<f64>,
     #[serde(skip_serializing_if = "Option::is_none")]
+    pub reasoning_effort: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
     pub agent_session: Option<String>,
     #[serde(default)]
     pub auto_continue: bool,
@@ -732,6 +742,7 @@ impl AgentConfig {
             model_id: graph.model.clone(),
             temperature: graph.temperature,
             top_p: graph.top_p,
+            reasoning_effort: graph.reasoning_effort.clone(),
             description: graph.description.clone(),
             global_tools: graph.global_tools.clone(),
             mcp_servers: graph.mcp_servers.clone(),
@@ -766,6 +777,9 @@ impl AgentConfig {
         if let Some(v) = read_env_value::<f64>(&with_prefix("top_p")) {
             self.top_p = v;
         }
+        if let Some(v) = read_env_value::<String>(&with_prefix("reasoning_effort")) {
+            self.reasoning_effort = v;
+        }
         if let Ok(v) = env::var(with_prefix("global_tools"))
             && let Ok(v) = serde_json::from_str(&v)
         {

src/config/app_config.rs

@@ -21,6 +21,7 @@ pub struct AppConfig {
     pub model_id: String,
     pub temperature: Option<f64>,
     pub top_p: Option<f64>,
+    pub reasoning_effort: Option<String>,
 
     pub dry_run: bool,
     pub stream: bool,
@@ -100,6 +101,7 @@ impl Default for AppConfig {
             model_id: Default::default(),
             temperature: None,
             top_p: None,
+            reasoning_effort: None,
 
             dry_run: false,
             stream: true,
@@ -177,6 +179,7 @@ impl AppConfig {
             model_id: config.model_id,
             temperature: config.temperature,
             top_p: config.top_p,
+            reasoning_effort: None,
 
             dry_run: config.dry_run,
             stream: config.stream,
@@ -426,6 +429,9 @@ impl AppConfig {
         if let Some(v) = super::read_env_value::<f64>(&get_env_name("top_p")) {
             self.top_p = v;
         }
+        if let Some(v) = super::read_env_value::<String>(&get_env_name("reasoning_effort")) {
+            self.reasoning_effort = v;
+        }
 
         if let Some(Some(v)) = super::read_env_bool(&get_env_name("dry_run")) {
             self.dry_run = v;

src/config/input.rs

@@ -253,6 +253,10 @@ impl Input {
         patch_messages(&mut messages, model);
         model.guard_max_input_tokens(&messages)?;
         let (temperature, top_p) = (self.role().temperature(), self.role().top_p());
+        let reasoning_effort = self
+            .role()
+            .reasoning_effort()
+            .or_else(|| model.default_reasoning_effort().map(|s| s.to_string()));
         let functions = if model.supports_function_calling() {
             let fns = self.functions.clone();
             if let Some(vec) = &fns {
@@ -268,6 +272,7 @@ impl Input {
             messages,
             temperature,
             top_p,
+            reasoning_effort,
             functions,
             stream,
         })

src/config/request_context.rs

@@ -969,6 +969,16 @@ impl RequestContext {
         }
     }
 
+    pub fn set_reasoning_effort_on_role_like(&mut self, value: Option<String>) -> bool {
+        match self.role_like_mut() {
+            Some(role_like) => {
+                role_like.set_reasoning_effort(value);
+                true
+            }
+            None => false,
+        }
+    }
+
     pub fn set_enabled_tools_on_role_like(&mut self, value: Option<Vec<String>>) -> bool {
         match self.role_like_mut() {
             Some(role_like) => {
@@ -1121,6 +1131,10 @@ impl RequestContext {
                 super::format_option_value(&role.temperature()),
             ),
             ("top_p", super::format_option_value(&role.top_p())),
+            (
+                "reasoning_effort",
+                super::format_option_value(&role.reasoning_effort()),
+            ),
             (
                 "enabled_tools",
                 super::format_option_value(&role.enabled_tools().map(|v| v.join(","))),
@@ -2009,6 +2023,12 @@ impl RequestContext {
                     self.update_app_config(|app| app.top_p = value);
                 }
             }
+            "reasoning_effort" => {
+                let value: Option<String> = super::parse_value(value)?;
+                if !self.set_reasoning_effort_on_role_like(value.clone()) {
+                    self.update_app_config(|app| app.reasoning_effort = value);
+                }
+            }
             "enabled_tools" => {
                 let raw: Option<String> = super::parse_value(value)?;
                 let parsed: Option<Vec<String>> = raw.map(|s| super::csv_to_vec(&s));
@@ -2303,6 +2323,10 @@ impl RequestContext {
                     super::map_completion_values(values)
                 }
                 ".macro" => super::map_completion_values(paths::list_macros()),
+                ".reasoning" => {
+                    let levels = self.current_model().reasoning_levels();
+                    levels.iter().map(|v| (v.clone(), None)).collect()
+                }
                 ".starter" => match &self.agent {
                     Some(agent) => agent
                         .conversation_starters()
@@ -2318,6 +2342,7 @@ impl RequestContext {
                         "continuation_prompt",
                         "temperature",
                         "top_p",
+                        "reasoning_effort",
                         "enabled_tools",
                         "enabled_mcp_servers",
                         "inject_todo_instructions",
@@ -2507,6 +2532,10 @@ impl RequestContext {
                 }
                 "skill_instructions" => vec!["null".to_string()],
                 "memory" => super::complete_bool(self.should_inject_memory()),
+                "reasoning_effort" => {
+                    let levels = self.current_model().reasoning_levels();
+                    levels.to_vec()
+                }
                 _ => vec![],
             };
             values = candidates.into_iter().map(|v| (v, None)).collect();

src/config/role.rs

@@ -32,7 +32,9 @@ pub trait RoleLike {
     fn enabled_mcp_servers(&self) -> Option<Vec<String>>;
     fn set_model(&mut self, model: Model);
     fn set_temperature(&mut self, value: Option<f64>);
+    fn reasoning_effort(&self) -> Option<String>;
     fn set_top_p(&mut self, value: Option<f64>);
+    fn set_reasoning_effort(&mut self, value: Option<String>);
     fn set_enabled_tools(&mut self, value: Option<Vec<String>>);
     fn set_enabled_mcp_servers(&mut self, value: Option<Vec<String>>);
 }
@@ -51,6 +53,8 @@ pub struct Role {
     temperature: Option<f64>,
     #[serde(skip_serializing_if = "Option::is_none")]
     top_p: Option<f64>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    reasoning_effort: Option<String>,
     #[serde(
         default,
         skip_serializing_if = "Option::is_none",
@@ -116,6 +120,9 @@ impl Role {
                     "model" => role.model_id = value.as_str().map(|v| v.to_string()),
                     "temperature" => role.temperature = value.as_f64(),
                     "top_p" => role.top_p = value.as_f64(),
+                    "reasoning_effort" => {
+                        role.reasoning_effort = value.as_str().map(|v| v.to_string())
+                    }
                     "enabled_tools" => role.enabled_tools = parse_string_or_array(value),
                     "enabled_mcp_servers" => {
                         role.enabled_mcp_servers = parse_string_or_array(value)
@@ -170,6 +177,9 @@ impl Role {
         if let Some(top_p) = self.top_p() {
             metadata.push(format!("top_p: {top_p}"));
         }
+        if let Some(reasoning_effort) = self.reasoning_effort() {
+            metadata.push(format!("reasoning_effort: {reasoning_effort}"));
+        }
         if let Some(enabled_tools) = &self.enabled_tools {
             let inline = serde_json::to_string(enabled_tools).unwrap_or_else(|_| "[]".to_string());
             metadata.push(format!("enabled_tools: {inline}"));
@@ -256,6 +266,9 @@ impl Role {
             enabled_tools,
             enabled_mcp_servers,
         );
+        if let Some(v) = role_like.reasoning_effort() {
+            self.set_reasoning_effort(Some(v));
+        }
     }
 
     pub fn batch_set(
@@ -410,6 +423,10 @@ impl RoleLike for Role {
         self.top_p
     }
 
+    fn reasoning_effort(&self) -> Option<String> {
+        self.reasoning_effort.clone()
+    }
+
     fn enabled_tools(&self) -> Option<Vec<String>> {
         self.enabled_tools.clone()
     }
@@ -433,6 +450,10 @@ impl RoleLike for Role {
         self.top_p = value;
     }
 
+    fn set_reasoning_effort(&mut self, value: Option<String>) {
+        self.reasoning_effort = value;
+    }
+
     fn set_enabled_tools(&mut self, value: Option<Vec<String>>) {
         self.enabled_tools = value;
     }

src/config/session.rs

@@ -24,6 +24,8 @@ pub struct Session {
     temperature: Option<f64>,
     #[serde(skip_serializing_if = "Option::is_none")]
     top_p: Option<f64>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    reasoning_effort: Option<String>,
     #[serde(
         default,
         skip_serializing_if = "Option::is_none",
@@ -401,6 +403,7 @@ impl Session {
         self.model_id = role.model().id();
         self.temperature = role.temperature();
         self.top_p = role.top_p();
+        self.reasoning_effort = role.reasoning_effort();
         self.enabled_tools = role.enabled_tools();
         self.enabled_mcp_servers = role.enabled_mcp_servers();
         self.model = role.model().clone();
@@ -792,6 +795,10 @@ impl RoleLike for Session {
         self.top_p
     }
 
+    fn reasoning_effort(&self) -> Option<String> {
+        self.reasoning_effort.clone()
+    }
+
     fn enabled_tools(&self) -> Option<Vec<String>> {
         self.enabled_tools.clone()
     }
@@ -823,6 +830,13 @@ impl RoleLike for Session {
         }
     }
 
+    fn set_reasoning_effort(&mut self, value: Option<String>) {
+        if self.reasoning_effort != value {
+            self.reasoning_effort = value;
+            self.dirty = true;
+        }
+    }
+
     fn set_enabled_tools(&mut self, value: Option<Vec<String>>) {
         if self.enabled_tools != value {
             self.enabled_tools = value;