diff --git a/scripts/verify-convex-contract.ts b/scripts/verify-convex-contract.ts
index 04e1e0a9..be2da763 100644
--- a/scripts/verify-convex-contract.ts
+++ b/scripts/verify-convex-contract.ts
@@ -1,5 +1,6 @@
 import { spawnSync } from "node:child_process";
-import { readFileSync, readdirSync } from "node:fs";
+import { mkdtempSync, readFileSync, readdirSync } from "node:fs";
+import { tmpdir } from "node:os";
 import { join, relative } from "node:path";
 import ts from "typescript";
 
@@ -55,8 +56,9 @@ function getExpectedIdentifiers() {
 }
 
 function getRemoteIdentifiers(cliArgs: string[]) {
-  const result = spawnSync("bunx", ["convex", "function-spec", ...cliArgs], {
-    cwd: root,
+  const tempDir = mkdtempSync(join(tmpdir(), "clawhub-function-spec-"));
+  const result = spawnSync("bunx", ["convex", "function-spec", "--file", ...cliArgs], {
+    cwd: tempDir,
     encoding: "utf8",
   });
   if (result.status !== 0) {
@@ -64,11 +66,16 @@ function getRemoteIdentifiers(cliArgs: string[]) {
     process.exit(result.status ?? 1);
   }
 
-  const stdout = result.stdout.trim();
-  const jsonStart = stdout.search(/[\[{]/);
-  const jsonPayload = jsonStart >= 0 ? stdout.slice(jsonStart) : stdout;
+  const fileName = readdirSync(tempDir)
+    .filter((entry) => entry.startsWith("function_spec_") && entry.endsWith(".json"))
+    .sort()
+    .at(-1);
+  if (!fileName) {
+    process.stderr.write(result.stderr || result.stdout || "Missing function spec output\n");
+    process.exit(1);
+  }
 
-  const parsed = JSON.parse(jsonPayload) as {
+  const parsed = JSON.parse(readFileSync(join(tempDir, fileName), "utf8")) as {
     functions?: Array<{ identifier?: string }>;
   };
   return new Set(