fix: add AgentMessage dispatch entry, allowed_tools, and debug logging

- Add missing AgentMessage dispatch entry in execute_tool_with_enforcer
  (tool spec existed but couldn't actually be called)
- Add AgentMessage to Explore/Plan/Verification/general-purpose
  allowed_tools lists so sub-agents can communicate
- Add debug logging to resolve_agent_model and load_subagent_model_from_config
  to diagnose subagentModel config chain

Co-authored-by: GLM 5.1 FP8 via Crush <crush@charm.land>

rust/crates/tools/src/lib.rs

@@ -1525,6 +1525,7 @@ fn execute_tool_with_enforcer(
             .and_then(run_worker_observe_completion),
         "TeamCreate" => from_value::<TeamCreateInput>(input).and_then(run_team_create),
         "TeamDelete" => from_value::<TeamDeleteInput>(input).and_then(run_team_delete),
+        "AgentMessage" => from_value::<AgentMessageInput>(input).and_then(run_agent_message),
         "CronCreate" => from_value::<CronCreateInput>(input).and_then(run_cron_create),
         "CronDelete" => from_value::<CronDeleteInput>(input).and_then(run_cron_delete),
         "CronList" => run_cron_list(input.clone()),
@@ -4728,21 +4729,36 @@ fn build_agent_system_prompt(subagent_type: &str, model: &str) -> Result<Vec<Str
 
 fn resolve_agent_model(model: Option<&str>) -> String {
     if let Some(m) = model.map(str::trim).filter(|m| !m.is_empty()) {
+        eprintln!("[agent] resolve_agent_model: using explicit model={m}");
         return m.to_string();
     }
     if let Some(fast) = load_subagent_model_from_config() {
+        eprintln!("[agent] resolve_agent_model: using subagentModel from config={fast}");
         return fast;
     }
+    eprintln!("[agent] resolve_agent_model: falling back to DEFAULT_AGENT_MODEL={DEFAULT_AGENT_MODEL}");
     DEFAULT_AGENT_MODEL.to_string()
 }
 
 fn load_subagent_model_from_config() -> Option<String> {
-    std::env::current_dir().ok().and_then(|cwd| {
-        ConfigLoader::default_for(&cwd)
-            .load()
-            .ok()
-            .and_then(|config| config.subagent_model().map(|m| m.to_string()))
-    })
+    let cwd = match std::env::current_dir() {
+        Ok(p) => p,
+        Err(e) => {
+            eprintln!("[agent] load_subagent_model_from_config: current_dir() failed: {e}");
+            return None;
+        }
+    };
+    match ConfigLoader::default_for(&cwd).load() {
+        Ok(config) => {
+            let result = config.subagent_model().map(|m| m.to_string());
+            eprintln!("[agent] load_subagent_model_from_config: cwd={} subagent_model={result:?}", cwd.display());
+            result
+        }
+        Err(e) => {
+            eprintln!("[agent] load_subagent_model_from_config: ConfigLoader::load() failed: {e}");
+            None
+        }
+    }
 }
 
 fn allowed_tools_for_subagent(subagent_type: &str) -> BTreeSet<String> {
@@ -4755,6 +4771,7 @@ fn allowed_tools_for_subagent(subagent_type: &str) -> BTreeSet<String> {
             "WebSearch",
             "ToolSearch",
             "Skill",
+            "AgentMessage",
             "StructuredOutput",
         ],
         "Plan" => vec![
@@ -4766,6 +4783,7 @@ fn allowed_tools_for_subagent(subagent_type: &str) -> BTreeSet<String> {
             "ToolSearch",
             "Skill",
             "TodoWrite",
+            "AgentMessage",
             "StructuredOutput",
             "SendUserMessage",
         ],
@@ -4778,6 +4796,7 @@ fn allowed_tools_for_subagent(subagent_type: &str) -> BTreeSet<String> {
             "WebSearch",
             "ToolSearch",
             "TodoWrite",
+            "AgentMessage",
             "StructuredOutput",
             "SendUserMessage",
             "PowerShell",
@@ -4816,6 +4835,7 @@ fn allowed_tools_for_subagent(subagent_type: &str) -> BTreeSet<String> {
             "ToolSearch",
             "NotebookEdit",
             "Sleep",
+            "AgentMessage",
             "SendUserMessage",
             "Config",
             "StructuredOutput",