diff --git a/apps/hub/src/inference/openai-responses.test.ts b/apps/hub/src/inference/openai-responses.test.ts
new file mode 100644
index 00000000..b5f421f3
--- /dev/null
+++ b/apps/hub/src/inference/openai-responses.test.ts
@@ -0,0 +1,37 @@
+import { expect, test } from "bun:test";
+import type { LastCycleSource } from "@intx/types/runtime";
+import { createOpenAIResponsesAdapter } from "./openai-responses.ts";
+
+const source: LastCycleSource = {
+  sourceId: "openai-default",
+  provider: "openai-responses",
+  model: "gpt-6.1-terra",
+};
+
+test("tools are sent non-strict so their optional fields stay optional", () => {
+  const request = createOpenAIResponsesAdapter(source).buildRequest(
+    [
+      {
+        role: "user",
+        content: [{ type: "text", text: "Hello" }],
+        timestamp: 0,
+      },
+    ],
+    "gpt-6.1-terra",
+    {
+      tools: [
+        {
+          name: "read_artifact",
+          description: "Read a document",
+          inputSchema: {
+            type: "object",
+            properties: { kind: { type: "string" } },
+          },
+        },
+      ],
+    },
+  );
+
+  const body = JSON.parse(request.body) as { tools: { strict?: boolean }[] };
+  expect(body.tools[0]?.strict).toBe(false);
+});
diff --git a/apps/hub/src/inference/openai-responses.ts b/apps/hub/src/inference/openai-responses.ts
new file mode 100644
index 00000000..2041372c
--- /dev/null
+++ b/apps/hub/src/inference/openai-responses.ts
@@ -0,0 +1,30 @@
+import { createOpenAIResponsesAdapter as createProviderOpenAIResponsesAdapter } from "@corbits/openai-responses";
+import type { AdapterFactory } from "@intx/inference";
+
+// OpenAI treats a function tool without `strict` as strict, which makes every property required, so
+// optional fields get invented values. A non-strict tool gives up OpenAI's promise that arguments
+// match the schema; every tool checks its own arguments, so a bad call fails and is retried instead.
+export const createOpenAIResponsesAdapter: AdapterFactory = (
+  source,
+  quirks,
+) => {
+  const adapter = createProviderOpenAIResponsesAdapter(source, quirks);
+  return {
+    ...adapter,
+    buildRequest: (messages, model, options) => {
+      const request = adapter.buildRequest(messages, model, options);
+      const body = JSON.parse(request.body) as { tools?: unknown };
+      if (!Array.isArray(body.tools)) return request;
+      return {
+        ...request,
+        body: JSON.stringify({
+          ...body,
+          tools: body.tools.map((tool: Record<string, unknown>) => ({
+            ...tool,
+            strict: false,
+          })),
+        }),
+      };
+    },
+  };
+};
diff --git a/apps/hub/src/provisioning/workflow-services.ts b/apps/hub/src/provisioning/workflow-services.ts
index 55423c85..709a2f38 100644
--- a/apps/hub/src/provisioning/workflow-services.ts
+++ b/apps/hub/src/provisioning/workflow-services.ts
@@ -92,7 +92,8 @@ export async function createWorkflowServices(options: {
   ) ?? [
     {
       provider: "openai-responses",
-      specifier: import.meta.resolve("@corbits/openai-responses"),
+      specifier: new URL("../inference/openai-responses.ts", import.meta.url)
+        .href,
       export: "createOpenAIResponsesAdapter",
     },
     {