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OpenCode plus Zen Gemini 3 Pro model causes errors #3071

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opened 2026-02-16 17:38:29 -05:00 by yindo · 5 comments
yindo commented 2026-02-16 17:38:29 -05:00
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Originally created by @rheckart on GitHub (Nov 23, 2025).

Originally assigned to: @rekram1-node on GitHub.

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

  1. Install the BMAD tools into an empty folder,
  2. Run OpenCode, choosing Zen Gemini 3 Pro as the model,
  3. Try a custom command like /bmad-workflow-bmm-workflow-status and the errors occur,
  4. Change the model to Zen Claude Sonnet 4.5,
  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

Originally created by @rheckart on GitHub (Nov 23, 2025). Originally assigned to: @rekram1-node on GitHub. ### Description I was using the [BMAD Method templates](https://github.com/bmad-code-org/BMAD-METHOD/tree/main) 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 1. Install the BMAD tools into an empty folder, 2. Run OpenCode, choosing Zen Gemini 3 Pro as the model, 3. Try a custom command like `/bmad-workflow-bmm-workflow-status` and the errors occur, 4. Change the model to Zen Claude Sonnet 4.5, 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
yindo added the opentuibug labels 2026-02-16 17:38:29 -05:00
yindo closed this issue 2026-02-16 17:38:29 -05:00
yindo commented 2026-02-16 17:38:29 -05:00
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@rekram1-node commented on GitHub (Nov 23, 2025):

There is an mcp server causing this issue looks like?

@rekram1-node commented on GitHub (Nov 23, 2025): There is an mcp server causing this issue looks like?
yindo commented 2026-02-16 17:38:29 -05:00
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@rekram1-node commented on GitHub (Nov 23, 2025):

Will fix tho

@rekram1-node commented on GitHub (Nov 23, 2025): Will fix tho
yindo commented 2026-02-16 17:38:29 -05:00
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@rheckart commented on GitHub (Nov 23, 2025):

There is an mcp server causing this issue looks like?

Could be? I only have two:

{
  "$schema": "https://opencode.ai/config.json",
  // Theme configuration
  "theme": "aura",
  "model": "anthropic/claude-sonnet-4-5",
  "autoupdate": true,
  "mcp": {
    "rider": {
      "type": "remote",
      "url": "http://localhost:64342/sse",
      "headers": {
        "IJ_MCP_SERVER_PROJECT_PATH": ""
      }
    },
    "context7": {
      "type": "remote",
      "url": "https://mcp.context7.com/mcp",
      "headers": {
        "CONTEXT7_API_KEY": "ctx7sk-..."
      }
    }
  }
}
@rheckart commented on GitHub (Nov 23, 2025): > There is an mcp server causing this issue looks like? Could be? I only have two: ```json { "$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-..." } } } } ```
yindo commented 2026-02-16 17:38:29 -05:00
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@rekram1-node commented on GitHub (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 commented on GitHub (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
yindo commented 2026-02-16 17:38:29 -05:00
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@rekram1-node commented on GitHub (Nov 23, 2025):

because by default it has tools that gemini cant use

@rekram1-node commented on GitHub (Nov 23, 2025): because by default it has tools that gemini cant use
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Reference: anomalyco/opencode#3071
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