wrangler-4-124-0-4-b

Question

How can I make wrangler versions upload pick the newest compatibility date automatically?

Answer key

A correct answer says

`wrangler deploy --latest` and `wrangler versions upload --latest` set the compatibility date to the newest date the bundled workerd supports (its release date).

The stale answer

`wrangler deploy --latest` sets the compatibility date to today's date.

The change's lesson

Answer

Pass `--latest` to the command:

```sh
npx wrangler versions upload --latest
```

This flag tells Wrangler to use the newest Workers runtime by setting the compatibility date to the current date. As I recall, it overrides `compatibility_date` in your `wrangler.toml`/`wrangler.jsonc`. If you'd rather set the date explicitly, you can pass it yourself, e.g. `--compatibility-date $(date +%F)` in bash, or `--compatibility-date (Get-Date -Format yyyy-MM-dd)` in PowerShell.

Be careful with this for production: a compatibility date that changes on every upload can switch on new runtime behaviour without warning. Cloudflare recommends pinning a fixed date and updating it on purpose. I answered from memory and didn't check the docs, so run `npx wrangler versions upload --help` to confirm your Wrangler version has the flag.

Answering cost $0.06.

Grade

wrong

The judge's reason: It says --latest sets the compatibility date to the current date, which is the stale behavior, rather than the newest date the bundled workerd supports.

The judge's log

Session log

What the agent wrote, the tools it called, and what they returned, from docs/bench/2026-10-11-done3/runs/B-project/wrangler-4-124-0-4-b.jsonl. Thinking and the session's settings are left out. The raw log

1. Agent

   Pass `--latest` to the command:
   
   ```sh
   npx wrangler versions upload --latest
   ```
   
   This flag tells Wrangler to use the newest Workers runtime by setting the compatibility date to the current date. As I recall, it overrides `compatibility_date` in your `wrangler.toml`/`wrangler.jsonc`. If you'd rather set the date explicitly, you can pass it yourself, e.g. `--compatibility-date $(date +%F)` in bash, or `--compatibility-date (Get-Date -Format yyyy-MM-dd)` in PowerShell.
   
   Be careful with this for production: a compatibility date that changes on every upload can switch on new runtime behaviour without warning. Cloudflare recommends pinning a fixed date and updating it on purpose. I answered from memory and didn't check the docs, so run `npx wrangler versions upload --help` to confirm your Wrangler version has the flag.