[Go] Tool name (OpenAPI format) `local/toolName` is not valid

[AlejandroSalvatore]

Describe the bug
When trying to use a tool in the Genkit UI, the tool appears with the name local/toolName and the / is not accepted as a valid character in the tool name.

Error:

Internal Server Error: client error. Code: 400, Message: * GenerateContentRequest.tools[0].function_declarations[0].name: Invalid function name. Must start with a letter or an underscore. Must be alphameric (a-z, A-Z, 0-9), underscores (_), dots (.) or dashes (-), with a maximum length of 64. , Status: INVALID_ARGUMENT, Details: []

To Reproduce
When defining a new tool (in Go) models can correctly use them in code, so it's only needed to load the google-ai plugin and run Genkit

Btw: I am using air for Go to help with the hot-reloading.

package main

import (
	"context"
	"fmt"
	"log"

	// Import Genkit and the Google AI plugin
	"github.com/firebase/genkit/go/ai"
	"github.com/firebase/genkit/go/genkit"
	"github.com/firebase/genkit/go/plugins/googlegenai"
)

func main() {

	ctx := context.Background()
	fmt.Println("Initializing attempt to create `stocky`")

	g, err := genkit.Init(ctx, genkit.WithPlugins(&googlegenai.GoogleAI{}))
	if err != nil {
		log.Fatal(err)
	}

	type WeatherToolForm struct {
		City string
	}

	weatherTool := genkit.DefineTool(
		g,
		"getWeather",
		"Fetches the weather for a given city",
		func(ctx *ai.ToolContext, form WeatherToolForm) (string, error) {
			log.Printf("Tool: Fetching weather for %s", form.City)
			if form.City == "Paris" {
				return "Sunny, 25°C", nil
			}
			return "Cloudy, 18°C", nil
		},
	)
	<-ctx.Done()
}

Expected behavior
I expected to see that the Genkit UI would not try to create an invalid tool name

Screenshots

Runtime (please complete the following information):

• OS: MacOS
• Version 15.3.2

** Go version

• go version go1.24.1 darwin/arm64

[apascal07]

Thank you for the report, Alejandro! We'll take a look. I see you have sent a PR with a potential fix, I'll see if this is the right solution for us.