diff --git a/plugin/tools/prompt-rules.ts b/plugin/tools/prompt-rules.ts
index 829ddb5..5897a6e 100644
--- a/plugin/tools/prompt-rules.ts
+++ b/plugin/tools/prompt-rules.ts
@@ -18,7 +18,7 @@ export function registerPromptRulesTool(
       "test (preview which prompts would be injected for an agent), " +
       "reload-routers (hot-reload all router functions), " +
       "list-routers (show loaded routers).",
-    inputSchema: {
+    parameters: {
       type: "object",
       properties: {
         action: {
@@ -55,51 +55,45 @@ export function registerPromptRulesTool(
       switch (action) {
         case "add": {
           if (!router || !key || !file) {
-            return { result: "Error: add requires router, key, and file" };
+            return { content: [{ type: "text", text: "Error: add requires router, key, and file" }] };
           }
           addRule(router, key, file);
-          return { result: `Rule added: ${router}:${key} → ${file}` };
+          return { content: [{ type: "text", text: `Rule added: ${router}:${key} → ${file}` }] };
         }
         case "remove": {
           if (!router || !key) {
-            return { result: "Error: remove requires router and key" };
+            return { content: [{ type: "text", text: "Error: remove requires router and key" }] };
           }
           const removed = removeRule(router, key);
-          return {
-            result: removed
-              ? `Rule removed: ${router}:${key}`
-              : `Rule not found: ${router}:${key}`,
-          };
+          const msg = removed ? `Rule removed: ${router}:${key}` : `Rule not found: ${router}:${key}`;
+          return { content: [{ type: "text", text: msg }] };
         }
         case "list": {
           const rules = listRules();
           const entries = Object.entries(rules);
-          if (entries.length === 0) return { result: "No rules registered." };
-          return { result: entries.map(([k, v]) => `${k} → ${v}`).join("\n") };
+          if (entries.length === 0) return { content: [{ type: "text", text: "No rules registered." }] };
+          return { content: [{ type: "text", text: entries.map(([k, v]) => `${k} → ${v}`).join("\n") }] };
         }
         case "test": {
-          if (!agent) return { result: "Error: test requires agent" };
+          if (!agent) return { content: [{ type: "text", text: "Error: test requires agent" }] };
           const result = await resolveInjection({ agentId: agent }, api.logger);
           if (!result.appendSystemContext) {
-            return { result: `No prompts matched for agent: ${agent}` };
+            return { content: [{ type: "text", text: `No prompts matched for agent: ${agent}` }] };
           }
-          return { result: `Matched prompts for ${agent}:\n\n${result.appendSystemContext}` };
+          return { content: [{ type: "text", text: `Matched prompts for ${agent}:\n\n${result.appendSystemContext}` }] };
         }
         case "reload-routers": {
           await loadRouters(routersDir, api.logger);
           const names = getRouterNames();
-          return { result: `Routers reloaded: ${names.join(", ") || "(none)"}` };
+          return { content: [{ type: "text", text: `Routers reloaded: ${names.join(", ") || "(none)"}` }] };
         }
         case "list-routers": {
           const names = getRouterNames();
-          return {
-            result: names.length > 0
-              ? `Loaded routers: ${names.join(", ")}`
-              : "No routers loaded.",
-          };
+          const msg = names.length > 0 ? `Loaded routers: ${names.join(", ")}` : "No routers loaded.";
+          return { content: [{ type: "text", text: msg }] };
         }
         default:
-          return { result: `Unknown action: ${action}` };
+          return { content: [{ type: "text", text: `Unknown action: ${action}` }] };
       }
     },
   });