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OpenCode plus Zen Gemini 3 Pro model causes errors #4665
Description
Description
I was using the BMAD Method templates with an older version of OpenCode, Zen Gemini 3 model and it was working fine. Upgrading to version 106 is now causing these issues with Gemini specifically:
* GenerateContentRequest.tools[0].function_declarations[11].parameters.properties[truncateMode].enum: only allowed for STRING type
* GenerateContentRequest.tools[0].function_declarations[23].parameters.properties[truncateMode].enum: only allowed for STRING type
* GenerateContentRequest.tools[0].function_declarations[29].parameters.properties[truncateMode].enum: only allowed for STRING type
* GenerateContentRequest.tools[0].function_declarations[31].parameters.properties[severityFilter].items.enum: only allowed for STRING type
Switching to another Zen model like Claude Sonnet 4.5 resolves the issue.
OpenCode version
1.0.106
Steps to reproduce
- Install the BMAD tools into an empty folder,
- Run OpenCode, choosing Zen Gemini 3 Pro as the model,
- Try a custom command like
/bmad-workflow-bmm-workflow-statusand the errors occur, - Change the model to Zen Claude Sonnet 4.5,
- Run the same custom command and the command completes as expected.
Screenshot and/or share link
No response
Operating System
Omarchy Arch Linux
Terminal
Ghostty
Activity
rekram1-node commentedon Nov 23, 2025
There is an mcp server causing this issue looks like?
rekram1-node commentedon Nov 23, 2025
Will fix tho
rheckart commentedon Nov 23, 2025
Could be? I only have two:
{ "$schema": "https://opencode.ai/config.json", // Theme configuration "theme": "aura", "model": "anthropic/claude-sonnet-4-5", "autoupdate": true, "mcp": { "rider": { "type": "remote", "url": "http://localhost:64342/sse", "headers": { "IJ_MCP_SERVER_PROJECT_PATH": "" } }, "context7": { "type": "remote", "url": "https://mcp.context7.com/mcp", "headers": { "CONTEXT7_API_KEY": "ctx7sk-..." } } } }rekram1-node commentedon Nov 23, 2025
the rider mcp has invalid tools, someone has a pr addressing at least part of this that ill merge in to fix tho
for now u can disable the mcp server
basically we have to edit the tools to translate them depending on what provider u are using
rekram1-node commentedon Nov 23, 2025
because by default it has tools that gemini cant use