Merge pull request #2811 from afjcjsbx/fix/mcp-streamable-http-support

fix(mcp): support streamable HTTP alias, request-response mode and integration tests

pkg/config/config.go

@@ -1126,7 +1126,11 @@ type MCPServerConfig struct {
 	Env map[string]string `json:"env,omitempty"`
 	// EnvFile is the path to a file containing environment variables (stdio only)
 	EnvFile string `json:"env_file,omitempty"`
-	// Type is "stdio", "sse", or "http" (default: stdio if command is set, sse if url is set)
+	// Type is "stdio", "sse", "http", or "streamable-http".
+	// "http" and "streamable-http" both select streamable HTTP request-response
+	// mode, while "sse" keeps the standalone SSE listener enabled for
+	// server-initiated notifications. Defaults: stdio if command is set, sse if
+	// url is set.
 	Type string `json:"type,omitempty"`
 	// URL is used for SSE/HTTP transport
 	URL string `json:"url,omitempty"`

pkg/config/mcp_transport.go

@@ -0,0 +1,32 @@
+package config
+
+import "strings"
+
+// NormalizeMCPTransportType canonicalizes MCP transport names used in config.
+// "http" is PicoClaw's streamable HTTP request-response mode, and
+// "streamable-http" is accepted as an explicit alias for the same transport.
+func NormalizeMCPTransportType(transport string) string {
+	normalized := strings.ToLower(strings.TrimSpace(transport))
+
+	switch normalized {
+	case "streamable-http", "streamable_http", "streamablehttp":
+		return "http"
+	default:
+		return normalized
+	}
+}
+
+// EffectiveMCPTransportType returns the normalized configured transport, or the
+// inferred default when the config leaves Type empty.
+func EffectiveMCPTransportType(server MCPServerConfig) string {
+	if transport := NormalizeMCPTransportType(server.Type); transport != "" {
+		return transport
+	}
+	if server.URL != "" {
+		return "sse"
+	}
+	if server.Command != "" {
+		return "stdio"
+	}
+	return ""
+}