fix(studio): keep uvx version pins out of MCP server names

internal/ext/mcpsetup/argv.go

@@ -177,6 +177,9 @@ func NameFromArgv(command string, args []string) string {
 		}
 	}
 	base := filepath.Base(candidate)
+	if runner == "uvx" {
+		base, _, _ = strings.Cut(base, "==")
+	}
 	if at := strings.Index(base, "@"); at > 0 {
 		base = base[:at]
 	}

internal/ext/mcpsetup/uvx_version_test.go

@@ -0,0 +1,38 @@
+package mcpsetup
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestUVXVersionPinDoesNotChangeDerivedServerName(t *testing.T) {
+	for _, spec := range []string{"demo-server", "[email protected]", "demo-server==1.2.0", "demo-server==2.0.0", "demo-server==1.2.0.post1", "demo-server==1.2.0+local"} {
+		t.Run(spec, func(t *testing.T) {
+			args := []string{"--python", "3.12", spec, "--stdio"}
+			draft, err := Parse("uvx --python 3.12 " + spec + " --stdio")
+			if err != nil || len(draft.Entries) != 1 {
+				t.Fatalf("Parse = %+v, %v", draft, err)
+			}
+			e := draft.Entries[0]
+			if e.Name != "demo-server" || e.Command != "uvx" || !reflect.DeepEqual(e.Args, args) {
+				t.Errorf("pasted version pin = %+v, want package name and unchanged argv", e)
+			}
+			cli, err := ParseArgs(append([]string{"--", "uvx"}, args...))
+			if err != nil || !reflect.DeepEqual(cli, e) {
+				t.Errorf("CLI entry = %+v, %v; want %+v", cli, err, e)
+			}
+			if got := NameFromArgv("uvx", args); got != "demo-server" {
+				t.Errorf("NameFromArgv = %q, want demo-server", got)
+			}
+		})
+	}
+	if got := NameFromArgv("custom", []string{"demo-server==1.2.0"}); got != "custom" {
+		t.Errorf("custom command name = %q", got)
+	}
+	if e, err := ParseArgs([]string{"chosen", "uvx", "demo-server==1.2.0"}); err != nil || e.Name != "chosen" {
+		t.Errorf("explicit server name = %+v, %v", e, err)
+	}
+	if got := NameFromArgv("uvx", nil); got != "mcp-server" {
+		t.Errorf("uvx without an operand = %q", got)
+	}
+}

internal/frontend/serve/mcp_registry_pypi_parse_test.go

@@ -0,0 +1,58 @@
+package serve
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"reflect"
+	"strings"
+	"testing"
+
+	"reasonix/internal/contract/config"
+	"reasonix/internal/ext/mcpregistry"
+	"reasonix/internal/session/control"
+)
+
+func TestMCPParseKeepsRegistryPyPIPackageIdentity(t *testing.T) {
+	registry := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != "/v0.1/servers" || r.URL.Query().Get("version") != "latest" {
+			t.Errorf("registry request = %s", r.URL)
+		}
+		_, _ = w.Write([]byte(`{"servers":[{"server":{"name":"io.example/demo-server","version":"1.2.0","packages":[{"registryType":"pypi","identifier":"demo-server","version":"1.2.0","transport":{"type":"stdio"}}]}}]}`))
+	}))
+	t.Cleanup(registry.Close)
+	client := mcpregistry.New("")
+	client.BaseURL = registry.URL
+	entry, _, err := client.Resolve(t.Context(), "io.example/demo-server")
+	if err != nil {
+		t.Fatal(err)
+	}
+	configured, err := entry.PluginEntry("")
+	if err != nil || configured.Command != "uvx" || !reflect.DeepEqual(configured.Args, []string{"demo-server==1.2.0"}) {
+		t.Fatalf("registry configuration = %+v, %v", configured, err)
+	}
+	input := configured.Command + " " + strings.Join(configured.Args, " ")
+	ctrl := control.New(control.Options{})
+	t.Cleanup(ctrl.Close)
+	srv := httptest.NewServer(operatorHandler(New(ctrl, NewBroadcaster(), config.ServeConfig{})))
+	t.Cleanup(srv.Close)
+	resp := postJSON(t, srv.URL+"/mcp/parse", map[string]string{"input": input})
+	defer resp.Body.Close()
+	var got struct {
+		Servers []draftServer `json:"servers"`
+		Risks   []draftRisk   `json:"risks"`
+	}
+	if err := json.NewDecoder(resp.Body).Decode(&got); err != nil || resp.StatusCode != http.StatusOK || len(got.Servers) != 1 {
+		t.Fatalf("preview: status=%d body=%+v err=%v", resp.StatusCode, got, err)
+	}
+	e := got.Servers[0]
+	if e.Name != configured.Name || e.Transport != "stdio" || e.Command != configured.Command || !reflect.DeepEqual(e.Args, configured.Args) {
+		t.Errorf("preview = %+v, want registry identity %q and exact pinned command", e, configured.Name)
+	}
+	if len(got.Risks) != 1 || got.Risks[0].Server != configured.Name || got.Risks[0].Kind != "shell" || got.Risks[0].Detail != input {
+		t.Errorf("preview disclosure = %+v", got.Risks)
+	}
+	if names := ctrl.ConfiguredMCPNames(); len(names) != 0 {
+		t.Errorf("preview installed servers: %v", names)
+	}
+}