Panic trying using gemini models

[shreyassanthu77]

I have no idea what is going on haven't checked the code (yet) but it seems to be an out of bounds exception? (probably a different thing going on under the hood)

panic: runtime error: slice bounds out of range [98:95]                                 No diagnostics  Gemini 2.5 Pro 

                                                       goroutine 227 [running]:
                                                                               github.com/kujtimiihoxha/opencode/internal/llm/provider.(*geminiClient).stream.func1()
                                                /home/shreyas/code/gh/opencode/opencode/internal/llm/provider/gemini.go:335 +0xedc
           created by github.com/kujtimiihoxha/opencode/internal/llm/provider.(*geminiClient).stream in goroutine 119
                                                                                                                      /home/shreyas/code/gh/opencode/opencode/internal/llm/provider/gemini.go:274 +0x2bf

here's my config

{
  "$schema": "...main/opencode-schema.json",
  "data": {
    "directory": ".opencode"
  },
  "providers": {
    "gemini": {
      "disabled": false
    }
  },
  "agents": {
    "title": {
      "model": "gemini-2.0-flash",
      "maxTokens": 100
    },
    "task": {
      "model": "gemini-2.5-flash"
    },
    "coder": {
      "model": "gemini-2.5"
    }
  },
  "lsp": {
    "zig": {
      "disabled": false,
      "command": "zls",
      "args": []
    }
  }
}

sidenote: should also handle panics gracefully, exit raw mode / alternate screen (or deinit charm stuff if you're using those ig) and then print the error message.

[shreyassanthu77]

update: setting max tokens to 50000 fixed the problem

edit: it infact did not work, it's still crashing

[shreyassanthu77]

another update: model gemini-2.5 doesn't seem to support tool calling, when I try to use it I get tool XYZ not found errors in the logs

but flash does seem to work 🤷‍♂️

didn't really look at the gemini docs to confirm this, too late for me rn will check this after i wake up

[shreyassanthu77]

even more another update: gemini 2.5 flash doesn't seem to work with tool calling either

[jorgeavaldez]

i'm experiencing the same issue

[kujtimiihoxha]

Yeah have not tested the gemini provider enough I will need to do a thorough review of it and fix this

[mmkal]

I got something similar with openai (gpt 4.1)

Caught panic:

runtime error: slice bounds out of range [4:3]

Restoring terminal...

goroutine 1 [running]:
runtime/debug.Stack()
        /home/runner/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.2.linux-amd64/src/runtime/debug/stack.go:26 +0x64
runtime/debug.PrintStack()
        /home/runner/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.2.linux-amd64/src/runtime/debug/stack.go:18 +0x1c
github.com/charmbracelet/bubbletea.(*Program).recoverFromPanic(0x14002738b40)
        /home/runner/go/pkg/mod/github.com/charmbracelet/bubbletea@v1.3.4/tea.go:758 +0x80
panic({0x106228980?, 0x1400292cca8?})
        /home/runner/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.2.linux-amd64/src/runtime/panic.go:792 +0x124
github.com/charmbracelet/bubbles/viewport.Model.visibleLines(...)
        /home/runner/go/pkg/mod/github.com/charmbracelet/bubbles@v0.20.0/viewport/viewport.go:123
github.com/charmbracelet/bubbles/viewport.(*Model).GotoBottom(0x14001633000?)
        /home/runner/go/pkg/mod/github.com/charmbracelet/bubbles@v0.20.0/viewport/viewport.go:237 +0x15c
github.com/charmbracelet/bubbles/viewport.(*Model).SetContent(0x140034e8a98, {0x14001633000?, 0x0?})
        /home/runner/go/pkg/mod/github.com/charmbracelet/bubbles@v0.20.0/viewport/viewport.go:107 +0xa8
github.com/opencode-ai/opencode/internal/tui/components/dialog.(*permissionDialogCmp).renderBashContent(0x140034e8a08)
        /home/runner/work/opencode/opencode/internal/tui/components/dialog/permission.go:254 +0x188
github.com/opencode-ai/opencode/internal/tui/components/dialog.(*permissionDialogCmp).render(0x140034e8a08)
        /home/runner/work/opencode/opencode/internal/tui/components/dialog/permission.go:365 +0x2a8
github.com/opencode-ai/opencode/internal/tui/components/dialog.(*permissionDialogCmp).View(0x0?)
        /home/runner/work/opencode/opencode/internal/tui/components/dialog/permission.go:401 +0x1c
github.com/opencode-ai/opencode/internal/tui.appModel.View({0x84, 0x1c, {0x10581df30, 0x4}, {0x0, 0x0}, 0x14000ac9e00, 0x14000ac9d10, {0x12ec28f38, 0x14000c080a0}, ...})
        /home/runner/work/opencode/opencode/internal/tui/tui.go:461 +0xe4
github.com/charmbracelet/bubbletea.(*Program).eventLoop(0x14002738b40, {0x1063572a8?, 0x14003182f08?}, 0x140005a02a0)
        /home/runner/go/pkg/mod/github.com/charmbracelet/bubbletea@v1.3.4/tea.go:510 +0x680
github.com/charmbracelet/bubbletea.(*Program).Run(0x14002738b40)
        /home/runner/go/pkg/mod/github.com/charmbracelet/bubbletea@v1.3.4/tea.go:647 +0x8ec
github.com/opencode-ai/opencode/cmd.init.func1(0x107144640, {0x10581db2c?, 0x4?, 0x10581db30?})
        /home/runner/work/opencode/opencode/cmd/root.go:136 +0x388
github.com/spf13/cobra.(*Command).execute(0x107144640, {0x14000122110, 0x1, 0x1})
        /home/runner/go/pkg/mod/github.com/spf13/cobra@v1.9.1/command.go:1015 +0x828
github.com/spf13/cobra.(*Command).ExecuteC(0x107144640)
        /home/runner/go/pkg/mod/github.com/spf13/cobra@v1.9.1/command.go:1148 +0x350
github.com/spf13/cobra.(*Command).Execute(...)
        /home/runner/go/pkg/mod/github.com/spf13/cobra@v1.9.1/command.go:1071
github.com/opencode-ai/opencode/cmd.Execute()
        /home/runner/work/opencode/opencode/cmd/root.go:247 +0x24
main.main()
        /home/runner/work/opencode/opencode/main.go:13 +0x4c

[shreyassanthu77]

That looks like it's a different issue. still out of bounds error but the stack trace feels weird

[jbutlerdev]

Also running into similar issues using gemini-2.5

[isaac-scarrott]

Have tried adding an OpenRouter provider which will allow calls to Gemini (with tools) #92

Not working consistently on larger repo's (maybe due to a greater tokens being used? need to see if it's inconsistent for other providers/models), but got some good results with it in the OpenCode repo

[kujtimiihoxha]

Gemini should be fixed here #96