feat(agent-tools): add model discovery for subagent selection

src/crates/assembly/core/src/agentic/agents/definitions/modes/claw.rs

@@ -17,6 +17,7 @@ impl ClawMode {
         Self {
             default_tools: vec![
                 "Task".to_string(),
+                "ListModels".to_string(),
                 "AgentWait".to_string(),
                 "Read".to_string(),
                 "view_image".to_string(),
@@ -95,6 +96,7 @@ mod tests {
     fn claw_mode_includes_init_miniapp_in_default_tools() {
         let tools = ClawMode::new().default_tools();
         assert!(tools.contains(&"InitMiniApp".to_string()));
+        assert!(tools.contains(&"ListModels".to_string()));
     }
 
     #[test]

src/crates/assembly/core/src/agentic/agents/definitions/modes/cowork.rs

@@ -31,6 +31,7 @@ impl CoworkMode {
                 "AskUserQuestion".to_string(),
                 "TodoWrite".to_string(),
                 "Task".to_string(),
+                "ListModels".to_string(),
                 "AgentWait".to_string(),
                 "Skill".to_string(),
                 // Discovery + editing
@@ -109,5 +110,6 @@ mod tests {
     fn cowork_mode_includes_init_miniapp_in_default_tools() {
         let tools = CoworkMode::new().default_tools();
         assert!(tools.contains(&"InitMiniApp".to_string()));
+        assert!(tools.contains(&"ListModels".to_string()));
     }
 }

src/crates/assembly/core/src/agentic/agents/definitions/modes/deep_research.rs

@@ -21,6 +21,7 @@ impl DeepResearchMode {
         Self {
             default_tools: vec![
                 "Task".to_string(),
+                "ListModels".to_string(),
                 "AgentWait".to_string(),
                 "WebSearch".to_string(),
                 "WebFetch".to_string(),
@@ -97,6 +98,7 @@ mod tests {
             tools.contains(&"Task".to_string()),
             "Task tool required for parallel sub-agent orchestration"
         );
+        assert!(tools.contains(&"ListModels".to_string()));
         assert!(tools.contains(&"WebSearch".to_string()));
         assert!(tools.contains(&"WebFetch".to_string()));
         assert!(tools.contains(&"Write".to_string()));

src/crates/assembly/core/src/agentic/agents/definitions/modes/team.rs

@@ -22,6 +22,7 @@ impl TeamMode {
             default_tools: vec![
                 "Skill".to_string(),
                 "Task".to_string(),
+                "ListModels".to_string(),
                 "AgentWait".to_string(),
                 "Read".to_string(),
                 "view_image".to_string(),
@@ -95,5 +96,6 @@ mod tests {
         assert_eq!(agent.prompt_template_name(None), "team_mode");
         assert!(!agent.is_readonly());
         assert!(agent.default_tools().contains(&"Skill".to_string()));
+        assert!(agent.default_tools().contains(&"ListModels".to_string()));
     }
 }

src/crates/assembly/core/src/agentic/agents/mod.rs

@@ -107,6 +107,7 @@ fn append_provider_group_tools(tools: &mut Vec<String>, provider_id: &'static st
 pub fn shared_coding_mode_tools() -> Vec<String> {
     let mut tools = vec![
         "Task".to_string(),
+        "ListModels".to_string(),
         "AgentWait".to_string(),
         "Read".to_string(),
         "view_image".to_string(),
@@ -291,6 +292,7 @@ mod tests {
     fn shared_coding_mode_tools_include_plan_and_debug_specific_tools() {
         let tools = shared_coding_mode_tools();
 
+        assert!(tools.contains(&"ListModels".to_string()));
         assert!(tools.contains(&"CreatePlan".to_string()));
         assert!(tools.contains(&"get_goal".to_string()));
         assert!(tools.contains(&"update_goal".to_string()));