gemini schema error: invalid value (TYPE_STRING), false #54033

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1. github-actions

   assigned

   kitlangton

   on Oct 8, 2026
2. opencode-agent commented on Oct 8, 2026

   

   opencode-agentbot

   on Oct 8, 2026 – with OpenCode Agent

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   Thanks for the report and the exact error, @jardon!

   1.18.35 is OpenCode v1. v1 only gets fixes for critical bugs (data loss, security problems, or breakage with no workaround), so this is unlikely to be fixed there.

   What's happening: one or more of your tools has a parameter schema with an enum that contains booleans (true/false). Gemini only accepts strings in enum here. The tool numbers in the error (function_declarations[10] and [41]) suggest the tools come from an MCP server or a plugin, not OpenCode's built-in tools.

   Workaround: disable your MCP servers or plugin tools one at a time until Gemini works again. Then keep the one causing the error turned off while you use Gemini models.

   v2: OpenCode v2 (@opencode/cli) sends tool schemas to Gemini in a different way, so it may not hit this error. Please try upgrading.

   If you think this is critical, or you see the same error on v2, please reply here.

   Related issues:

   • cant request gemini #2687: same kind of Gemini error from MCP tool schemas, resolved by disabling the MCP server
   • fix(llm): coerce boolean enums to strings in Gemini adapter #53883: proposed v1 fix that turns boolean enums into strings (not merged)
   • Google provider: schema validation error - numeric values in enum fields #33041 / Schema validation error with Google/Gemini models #8036: the same Gemini check, but with numbers in the enum
3. opencode-agent

   added

   pending close

   triaging

   on Oct 8, 2026
4. jardon

   closed this as completedon Oct 9, 2026
5. opencode-agent

   closed this as not plannedon Oct 9, 2026
6. opencode-agent commented on Oct 9, 2026

   

   opencode-agentbot

   on Oct 9, 2026 – with OpenCode Agent

   Contributor

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   We haven't heard back, so I'm closing this as not planned. This Gemini schema error was reported on v1 (1.18.35), and v1 only gets fixes for critical bugs. You can work around it by disabling the MCP server or plugin tool whose schema has boolean enum values. OpenCode v2 (@opencode/cli) sends tool schemas to Gemini in a different way, so it's worth trying.

   If you see the same error on v2, please open a new issue with your v2 version, or reply here. Thanks again for the report, @jardon!