MCP golang is an unofficial implementaion of the Model Context Protocol in Go.
Docs can be found at https://mcpgolang.com
type Content struct {
Title string `json:"title" jsonschema:"required,description=The title to submit"`
Description *string `json:"description" jsonschema:"description=The description to submit"`
}
type MyFunctionsArguments struct {
Submitter string `json:"submitter" jsonschema:"required,description=The name of the thing calling this tool (openai, google, claude, etc)"`
Content Content `json:"content" jsonschema:"required,description=The content of the message"`
}
func main() {
done := make(chan struct{})
server := mcp_golang.NewServer(stdio.NewStdioServerTransport())
err := server.RegisterTool("hello", "Say hello to a person", func(arguments MyFunctionsArguments) (*mcp_golang.ToolResponse, error) {
return mcp_golang.NewToolReponse(mcp_golang.NewTextContent(fmt.Sprintf("Hello, %server!", arguments.Submitter))), nil
})
if err != nil {
panic(err)
}
err = server.RegisterPrompt("promt_test", "This is a test prompt", func(arguments Content) (*mcp_golang.PromptResponse, error) {
return mcp_golang.NewPromptResponse("description", mcp_golang.NewPromptMessage(mcp_golang.NewTextContent(fmt.Sprintf("Hello, %server!", arguments.Title)), mcp_golang.RoleUser)), nil
})
if err != nil {
panic(err)
}
err = server.RegisterResource("test://resource", "resource_test", "This is a test resource", "application/json", func() (*mcp_golang.ResourceResponse, error) {
return mcp_golang.NewResourceResponse(mcp_golang.NewTextEmbeddedResource("test://resource", "This is a test resource", "application/json")), nil
})
err = server.Serve()
if err != nil {
panic(err)
}
<-done
}
This will start a server using the stdio transport (used by claude desktop), host a tool called "hello" that will say hello to the user who submitted it.
You can use raw go structs as the input to your tools, the library handles generating the messages, deserialization, etc.
Contributions are more than welcome! Please check out our contribution guidelines.
Got any suggestions, have a question on the api or usage? Ask on the discord server. A maintainer will be happy to help you out.
Currently under development
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