fix: resolve build errors

src/agents/clawdis-tools.ts

@@ -77,6 +77,16 @@ type StringParamOptions = {
   label?: string;
 };
 
+function readStringParam(
+  params: Record<string, unknown>,
+  key: string,
+  options: StringParamOptions & { required: true },
+): string;
+function readStringParam(
+  params: Record<string, unknown>,
+  key: string,
+  options?: StringParamOptions,
+): string | undefined;
 function readStringParam(
   params: Record<string, unknown>,
   key: string,
@@ -783,7 +793,12 @@ function createCanvasTool(): AnyAgentTool {
             payload?: { result?: string };
           };
           const result = raw?.payload?.result;
-          if (result) return { content: [{ type: "text", text: result }] };
+          if (result) {
+            return {
+              content: [{ type: "text", text: result }],
+              details: { result },
+            };
+          }
           return jsonResult({ ok: true });
         }
         case "snapshot": {

src/agents/models-config.ts

@@ -15,7 +15,7 @@ function isRecord(value: unknown): value is Record<string, unknown> {
   return Boolean(value && typeof value === "object" && !Array.isArray(value));
 }
 
-async function readJson(pathname: string): Promise<unknown | null> {
+async function readJson(pathname: string): Promise<unknown> {
   try {
     const raw = await fs.readFile(pathname, "utf8");
     return JSON.parse(raw) as unknown;