Agents SDK crashes with error 1042 when routes config is present in wrangler.jsonc

[bluk1020]

Description

When using the Cloudflare Agents SDK with a routes configuration in wrangler.jsonc, the deployment fails with error 1042. Removing the routes block and configuring custom domains via the CF Dashboard or API works fine.

Steps to Reproduce

1. Create a Worker using the Agents SDK with a Durable Object (e.g., extending AIChatAgent)
2. Add a routes config to wrangler.jsonc:

{
  "name": "my-agent",
  "main": "src/index.ts",
  "routes": [
    { "pattern": "app.example.com/*", "zone_name": "example.com" }
  ],
  "durable_objects": {
    "bindings": [
      { "name": "MY_AGENT", "class_name": "MyAgent" }
    ]
  }
}

3. Run wrangler deploy

Expected Behavior

Worker deploys with the configured route.

Actual Behavior

Deployment fails with error 1042.

Workaround

Remove routes from wrangler.jsonc and configure custom domains via the CF Dashboard or API instead. This works, but having to bypass wrangler.jsonc for routing defeats the purpose of declarative config.

Environment

• wrangler v4.x
• Agents SDK (latest)
• Durable Objects with SQLite migrations
• compatibility_date: 2025-03-04
• compatibility_flags: ["nodejs_compat"]

[threepointone]

That's a weird error, it's about an worker calling another worker with fetch. Can you try with a more recent compat date? like today's date

(If it persists, this is probably something to be filed in the workers-sdk repo)