text content blocks must be non-empty when using Claude models and tools

[yexiaoxue2000-rgb]

Description

Describe the bug
When using OpenCode with any Claude models, I frequently encounter an API error: text content blocks must be non-empty. This error typically occurs during tool usage (like reading files or searching). Once the error appears, the current conversation becomes unusable, and I have to start a completely new session to continue working.

To Reproduce
Steps to reproduce the behavior:

1. Start a new session with OpenCode using a Claude model (Sonnet/Opus).
2. Ask the agent to perform tasks that involve using tools (e.g., exploring project structure, reading multiple files, or searching).
3. The agent attempts to call a tool or respond.
4. The error text content blocks must be non-empty is thrown, and the agent stops responding properly.

Expected behavior
The agent should successfully execute tools and format the API request correctly without sending empty text content blocks to the Anthropic API.

Logs / Error Output

BadRequestError: 400 {"type":"error","error":{"type":"invalid_request_error","message":"text content blocks must be non-empty"}}
    at APIError.generate (node_modules/@anthropic-ai/sdk/error.js:...)
    at Anthropic.makeRequest (node_modules/@anthropic-ai/sdk/core.js:...)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)

<img width="456" height="88" alt="Image" src="https://github.com/user-attachments/assets/e1a3a38d-00b6-4edf-940b-9f99f7f371aa" />

### Plugins

没有

### OpenCode version

最新版

### Steps to reproduce

_No response_

### Screenshot and/or share link

<img width="456" height="88" alt="Image" src="https://github.com/user-attachments/assets/544fdfb6-4bf1-4846-be7a-1150fe60410e" />

### Operating System

w11

### Terminal

_No response_

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• bug: text content blocks must be non-empty in custom provider #16332: Same text content blocks must be non-empty error occurring with Claude models and tool usage
• bug: message pipeline has no final empty-content guard, causing ValidationException on Bedrock and hard failures on other providers #23260: Root-cause analysis of the same empty-content bug in the message pipeline
• ValidationException: text content blocks must be non-empty when using Bedrock Runtime #15715: Same ValidationException: text content blocks must be non-empty error (Bedrock variant)

If your issue is the same, please add a thumbs-up or comment on the existing issue rather than opening a new one.

[github-actions]

To stay organized issues are automatically closed after 60 days of no activity. If the issue is still relevant please open a new one.