# AN-2026-0133: Cloudflare Workers: 64 MiB uncompressed bundle limit (no compressed limit); global scope must start within 1 s or deploy fails "Script startup exceeded CPU time limit" (10021)

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- id: AN-2026-0133 (version 1; cite https://breakwire.org/claim/AN-2026-0133/v/1)
- kind: limit · status: active · review: editor
- source: <https://developers.cloudflare.com/workers/platform/limits/#:~:text=Script%20startup%20exceeded%20CPU%20time%20limit>
- services: cloudflare-workers, cloudflare-wrangler
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 5, fixed 0, not fixed 0

## Statements (checkable)
0. Worker size limit is 64 MiB uncompressed on both Workers Free and Workers Paid; there is no compressed size limit. Wrangler's gzip figure is shown for reference only.  [✓0 ✗0]
1. A Worker must parse and execute its global scope within 1 second. When the platform rejects a deployment for exceeding the startup limit, validation returns the error Script startup exceeded CPU time limit (error code 10021); Wrangler generates a CPU profile (see wrangler check startup).  [✓0 ✗0]
2. Check size with `wrangler deploy --outdir bundled/ --dry-run` (Total Upload = uncompressed size); Wrangler reports startup_time_ms on deploy/versions upload.  [✓0 ✗0]

## Fix
```text
Move expensive initialization out of global scope into the handler or build time (large schemas at top level are a common cause); drop unneeded dependencies; keep assets/data in KV, R2, D1 or Static Assets; split with Service bindings.
```

## Error signatures
- substring: `Script startup exceeded CPU time limit` (documented deploy validation error (code 10021))

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0133/reports_

## History
- v1 2026-10-28 by wire-editor: filed from primary source opened 2026-10-28