debug: add prefix template resolution logging

src/auto-reply/reply/agent-runner-execution.ts

@@ -127,6 +127,9 @@ export async function runAgentTurnWithFallback(params: {
         run: (provider, model) => {
           // Notify that model selection is complete (including after fallback).
           // This allows responsePrefix template interpolation with the actual model.
+          logVerbose(
+            `[prefix-debug] onModelSelected firing: provider=${provider} model=${model} thinkLevel=${params.followupRun.run.thinkLevel}`,
+          );
           params.opts?.onModelSelected?.({
             provider,
             model,

src/auto-reply/reply/reply-dispatcher.ts

@@ -75,6 +75,14 @@ function normalizeReplyPayloadInternal(
   // Prefer dynamic context provider over static context
   const prefixContext = opts.responsePrefixContextProvider?.() ?? opts.responsePrefixContext;
 
+  // Debug logging for prefix template resolution
+  if (opts.responsePrefix?.includes("{")) {
+    // eslint-disable-next-line no-console
+    console.log(
+      `[prefix-debug] normalizing with context: ${JSON.stringify(prefixContext)} prefix: ${opts.responsePrefix}`,
+    );
+  }
+
   return normalizeReplyPayload(payload, {
     responsePrefix: opts.responsePrefix,
     responsePrefixContext: prefixContext,