feat: Add Anthropic integration in HTTP transport

core/providers/anthropic.go

@@ -489,6 +489,8 @@ func prepareAnthropicChatRequest(messages []schemas.BifrostMessage, params *sche
 	if params != nil && params.ToolChoice != nil {
 		switch toolChoice := params.ToolChoice.Type; toolChoice {
 		case schemas.ToolChoiceTypeFunction:
+			fallthrough
+		case "tool":
 			preparedParams["tool_choice"] = map[string]interface{}{
 				"type": "tool",
 				"name": params.ToolChoice.Function.Name,

transports/bifrost-http/integrations/anthropic/router.go

@@ -0,0 +1,39 @@
+package anthropic
+
+import (
+	bifrost "github.com/maximhq/bifrost/core"
+	"github.com/maximhq/bifrost/core/schemas"
+	"github.com/maximhq/bifrost/transports/bifrost-http/integrations"
+)
+
+// AnthropicRouter holds route registrations for Anthropic endpoints.
+// It supports standard chat completions and image-enabled vision capabilities.
+type AnthropicRouter struct {
+	*integrations.GenericRouter
+}
+
+// NewAnthropicRouter creates a new AnthropicRouter with the given bifrost client.
+func NewAnthropicRouter(client *bifrost.Bifrost) *AnthropicRouter {
+	routes := []integrations.RouteConfig{
+		{
+			Path:   "/anthropic/v1/messages",
+			Method: "POST",
+			GetRequestTypeInstance: func() interface{} {
+				return &AnthropicMessageRequest{}
+			},
+			RequestConverter: func(req interface{}) *schemas.BifrostRequest {
+				if anthropicReq, ok := req.(*AnthropicMessageRequest); ok {
+					return anthropicReq.ConvertToBifrostRequest()
+				}
+				return nil
+			},
+			ResponseFunc: func(resp *schemas.BifrostResponse) interface{} {
+				return DeriveAnthropicFromBifrostResponse(resp)
+			},
+		},
+	}
+
+	return &AnthropicRouter{
+		GenericRouter: integrations.NewGenericRouter(client, routes),
+	}
+}