AiError: Bad input when using Cloudflare Workers AI — message content format mismatch

[Taimoorkhan1122]

Description

Bug Description

Selecting any Cloudflare Workers AI model causes AiError: Bad input with schema validation failure. Messages are sent with inconsistent content field types in the same request.

Error

Bad Request: {"errors":{"message":"AiError: Bad input: Error: oneOf at '/' not met, 0 matches: required properties at '/' are 'prompt', Type mismatch of '/messages/0/content', 'array' not in 'string', Type mismatch of '/messages/1/content', 'string' not in 'array', required properties at '/messages/1' are 'role,content' (d9e09afe-fe49-4051-bc1d-8901f858ff52)","code":5006},"success":false,"result":{},"messages":[]}

Root Cause

A mix of Anthropic-style and OpenAI-style message formats in the same request:

• Some messages have content as an array ([{type: "text", text: "..."}])
• Others have content as a string ("...")
  Cloudflare Workers AI expects OpenAI-compatible schema where content type is consistent.

To Reproduce

1. Configure opencode with Cloudflare Workers AI as provider
2. Select any Cloudflare Workers AI model
3. Start a conversation — error appears immediately

Environment

• opencode version: 1.15.5 (Homebrew)
• Provider: Cloudflare Workers AI
• Platform: macOS
• No custom system prompt

Plugins

superpowers

OpenCode version

1.15.13

Steps to reproduce

1. Configure opencode with Cloudflare Workers AI as provider
2. Select any Cloudflare Workers AI model
3. Start a conversation — error appears immediately

Screenshot and/or share link

Operating System

macOS 26.4.1 (25E253)

Terminal

Terminal

[ulises-jeremias]

I’d like to take this one. I’ll trace the Cloudflare Workers AI request formatting path, reproduce the mixed message content shape (text string vs content array), and open a focused fix with regression tests.

[ulises-jeremias]

Opened a fix PR with regression tests:

• fix(provider): normalize cloudflare-workers-ai mixed message content #30589

It normalizes Cloudflare Workers AI mixed message content shapes (string + text-part arrays) into a consistent string form when safe, while preserving tool/non-text arrays unchanged.

[daton89]

I've the same issue, @ulises-jeremias thanks for fixing it...
when do you plan to release it?

[ulises-jeremias]

I've the same issue, @ulises-jeremias thanks for fixing it... when do you plan to release it?

@nexxeln do you mind taking a look to this PR with the fix? #30589 👀