diff --git a/cmd/update/update_test.go b/cmd/update/update_test.go
index 5cfe52477..ab3382812 100644
--- a/cmd/update/update_test.go
+++ b/cmd/update/update_test.go
@@ -9,6 +9,8 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"net/http"
+	"net/http/httptest"
 	"os/exec"
 	"strings"
 	"testing"
@@ -28,6 +30,22 @@ func newTestFactory(t *testing.T) (*cmdutil.Factory, *bytes.Buffer, *bytes.Buffe
 	return f, stdout, stderr
 }
 
+func officialSkillsIndexURLForTest(t *testing.T) string {
+	t.Helper()
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodGet {
+			t.Fatalf("method = %s, want GET", r.Method)
+		}
+		if r.URL.Path != "/.well-known/skills/index.json" {
+			t.Fatalf("path = %s, want /.well-known/skills/index.json", r.URL.Path)
+		}
+		w.Header().Set("Content-Type", "application/json")
+		_, _ = w.Write([]byte(`{"skills":[{"name":"lark-calendar"},{"name":"lark-mail"}]}`))
+	}))
+	t.Cleanup(server.Close)
+	return server.URL + "/.well-known/skills/index.json"
+}
+
 // mockDetect sets up newUpdater to return an Updater with the given DetectResult.
 func mockDetect(t *testing.T, result selfupdate.DetectResult) {
 	t.Helper()
@@ -35,6 +53,8 @@ func mockDetect(t *testing.T, result selfupdate.DetectResult) {
 	newUpdater = func() *selfupdate.Updater {
 		u := selfupdate.New()
 		u.DetectOverride = func() selfupdate.DetectResult { return result }
+		u.OfficialSkillsIndexURL = officialSkillsIndexURLForTest(t)
+		u.SkillsCommandOverride = successfulSkillsCommand()
 		return u
 	}
 	t.Cleanup(func() { newUpdater = origNew })
@@ -49,6 +69,7 @@ func mockDetectAndNpm(t *testing.T, result selfupdate.DetectResult, npmFn func(s
 		u.DetectOverride = func() selfupdate.DetectResult { return result }
 		u.NpmInstallOverride = npmFn
 		u.VerifyOverride = func(string) error { return nil }
+		u.OfficialSkillsIndexURL = officialSkillsIndexURLForTest(t)
 		u.SkillsCommandOverride = successfulSkillsCommand()
 		return u
 	}
@@ -59,10 +80,14 @@ func successfulSkillsCommand() func(args ...string) *selfupdate.NpmResult {
 	return func(args ...string) *selfupdate.NpmResult {
 		r := &selfupdate.NpmResult{}
 		switch strings.Join(args, " ") {
-		case "-y skills add https://open.feishu.cn --list":
-			r.Stdout.WriteString("Available Skills\n │    lark-calendar\n │    lark-mail\n")
 		case "-y skills ls -g":
 			r.Stdout.WriteString("Global Skills\nlark-calendar /tmp/lark-calendar\ncustom-skill /tmp/custom-skill\n")
+		case "-y skills add https://open.feishu.cn -s lark-calendar lark-mail -g -y":
+			// incremental install succeeds
+		case "-y skills add https://open.feishu.cn -g -y":
+			// full install succeeds
+		case "-y skills add larksuite/cli -g -y":
+			// fallback full install succeeds
 		default:
 		}
 		return r
diff --git a/internal/selfupdate/updater.go b/internal/selfupdate/updater.go
index 8cba0b7d3..56777c673 100644
--- a/internal/selfupdate/updater.go
+++ b/internal/selfupdate/updater.go
@@ -10,7 +10,10 @@ import (
 	"bytes"
 	"context"
 	"fmt"
+	"io"
+	"net/http"
 	"os/exec"
+	"regexp"
 	"strings"
 	"time"
 
@@ -24,6 +27,8 @@ import (
 // Tests that mutate execLookPath must not call t.Parallel().
 var execLookPath = exec.LookPath
 
+var officialSkillNamePattern = regexp.MustCompile(`^lark-[a-z0-9](?:[a-z0-9-]*[a-z0-9])?$`)
+
 // InstallMethod describes how the CLI was installed.
 type InstallMethod int
 
@@ -42,6 +47,13 @@ const (
 	verifyTimeout       = 10 * time.Second
 )
 
+const (
+	officialSkillsIndexDefaultURL = "https://open.feishu.cn/.well-known/skills/index.json"
+	officialSkillsIndexMaxBytes   = 2 << 20
+)
+
+var officialSkillsIndexURL = officialSkillsIndexDefaultURL
+
 // DetectResult holds installation detection results.
 type DetectResult struct {
 	Method       InstallMethod
@@ -86,6 +98,7 @@ type Updater struct {
 	SkillsCommandOverride    func(args ...string) *NpmResult
 	VerifyOverride           func(expectedVersion string) error
 	RestoreAvailableOverride func() bool
+	OfficialSkillsIndexURL   string
 
 	// backupCreated is set to true by PrepareSelfReplace (Windows) when the
 	// running binary is successfully renamed to .old. Used by
@@ -154,10 +167,53 @@ func (u *Updater) RunNpmInstall(version string) *NpmResult {
 }
 
 func (u *Updater) ListOfficialSkills() *NpmResult {
-	r := u.runSkillsListOfficial("https://open.feishu.cn")
-	if r.Err != nil {
-		r = u.runSkillsListOfficial("larksuite/cli")
+	return u.fetchOfficialSkillsIndex()
+}
+
+func (u *Updater) fetchOfficialSkillsIndex() *NpmResult {
+	r := &NpmResult{}
+	indexURL := officialSkillsIndexURL
+	if u.OfficialSkillsIndexURL != "" {
+		indexURL = u.OfficialSkillsIndexURL
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), skillsUpdateTimeout)
+	defer cancel()
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, indexURL, nil)
+	if err != nil {
+		r.Err = fmt.Errorf("create official skills index request %s: %w", indexURL, err)
+		return r
+	}
+	req.Header.Set("Accept", "application/json")
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		if ctx.Err() == context.DeadlineExceeded {
+			r.Err = fmt.Errorf("official skills index fetch timed out after %s: %s", skillsUpdateTimeout, indexURL)
+			return r
+		}
+		r.Err = fmt.Errorf("fetch official skills index %s: %w", indexURL, err)
+		return r
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode < http.StatusOK || resp.StatusCode >= http.StatusMultipleChoices {
+		r.Err = fmt.Errorf("fetch official skills index %s: HTTP %s", indexURL, resp.Status)
+		return r
+	}
+
+	body, err := io.ReadAll(io.LimitReader(resp.Body, officialSkillsIndexMaxBytes+1))
+	if err != nil {
+		r.Err = fmt.Errorf("read official skills index %s: %w", indexURL, err)
+		return r
+	}
+	if len(body) > officialSkillsIndexMaxBytes {
+		r.Err = fmt.Errorf("official skills index %s exceeds %d bytes", indexURL, officialSkillsIndexMaxBytes)
+		return r
 	}
+
+	_, _ = r.Stdout.Write(body)
 	return r
 }
 
@@ -166,6 +222,10 @@ func (u *Updater) ListGlobalSkills() *NpmResult {
 }
 
 func (u *Updater) InstallSkill(nameList []string) *NpmResult {
+	if err := validateOfficialSkillNames(nameList); err != nil {
+		return &NpmResult{Err: err}
+	}
+
 	r := u.runSkillsInstall("https://open.feishu.cn", nameList)
 	if r.Err != nil {
 		r = u.runSkillsInstall("larksuite/cli", nameList)
@@ -173,6 +233,15 @@ func (u *Updater) InstallSkill(nameList []string) *NpmResult {
 	return r
 }
 
+func validateOfficialSkillNames(nameList []string) error {
+	for _, name := range nameList {
+		if !officialSkillNamePattern.MatchString(name) {
+			return fmt.Errorf("invalid official skill name %q", name)
+		}
+	}
+	return nil
+}
+
 func (u *Updater) InstallAllSkills() *NpmResult {
 	r := u.runSkillsAdd("https://open.feishu.cn")
 	if r.Err != nil {
@@ -185,10 +254,6 @@ func (u *Updater) runSkillsAdd(source string) *NpmResult {
 	return u.runSkillsCommand("-y", "skills", "add", source, "-g", "-y")
 }
 
-func (u *Updater) runSkillsListOfficial(source string) *NpmResult {
-	return u.runSkillsCommand("-y", "skills", "add", source, "--list")
-}
-
 func (u *Updater) runSkillsListGlobal() *NpmResult {
 	return u.runSkillsCommand("-y", "skills", "ls", "-g")
 }
diff --git a/internal/selfupdate/updater_test.go b/internal/selfupdate/updater_test.go
index 458f3f79b..24999ba5e 100644
--- a/internal/selfupdate/updater_test.go
+++ b/internal/selfupdate/updater_test.go
@@ -5,6 +5,8 @@ package selfupdate
 
 import (
 	"fmt"
+	"net/http"
+	"net/http/httptest"
 	"os"
 	"path/filepath"
 	"runtime"
@@ -174,13 +176,6 @@ func TestSkillsCommandsUseExpectedArgs(t *testing.T) {
 		run  func(*Updater) *NpmResult
 		want string
 	}{
-		{
-			name: "list official primary",
-			run: func(u *Updater) *NpmResult {
-				return u.runSkillsListOfficial("https://open.feishu.cn")
-			},
-			want: "-y skills add https://open.feishu.cn --list",
-		},
 		{
 			name: "list global",
 			run: func(u *Updater) *NpmResult {
@@ -225,29 +220,90 @@ func TestSkillsCommandsUseExpectedArgs(t *testing.T) {
 	}
 }
 
-func TestListOfficialSkillsFallsBack(t *testing.T) {
-	called := []string{}
-	updater := &Updater{
+func TestListOfficialSkillsFetchesIndexJSON(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodGet {
+			t.Fatalf("method = %s, want GET", r.Method)
+		}
+		if r.URL.Path != "/.well-known/skills/index.json" {
+			t.Fatalf("path = %s, want /.well-known/skills/index.json", r.URL.Path)
+		}
+		w.Header().Set("Content-Type", "application/json")
+		_, _ = w.Write([]byte(`{"skills":[{"name":"lark-calendar"}]}`))
+	}))
+	defer server.Close()
+
+	oldURL := officialSkillsIndexURL
+	officialSkillsIndexURL = server.URL + "/.well-known/skills/index.json"
+	defer func() { officialSkillsIndexURL = oldURL }()
+
+	u := New()
+	result := u.ListOfficialSkills()
+	if result.Err != nil {
+		t.Fatalf("ListOfficialSkills() err = %v, want nil", result.Err)
+	}
+	if got := result.Stdout.String(); !strings.Contains(got, `"lark-calendar"`) {
+		t.Fatalf("ListOfficialSkills() stdout = %q, want index JSON", got)
+	}
+}
+
+func TestListOfficialSkillsNon2xxFails(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		http.Error(w, "nope", http.StatusBadGateway)
+	}))
+	defer server.Close()
+
+	oldURL := officialSkillsIndexURL
+	officialSkillsIndexURL = server.URL + "/.well-known/skills/index.json"
+	defer func() { officialSkillsIndexURL = oldURL }()
+
+	u := New()
+	result := u.ListOfficialSkills()
+	if result.Err == nil {
+		t.Fatal("ListOfficialSkills() err = nil, want error")
+	}
+	if !strings.Contains(result.Err.Error(), "502") {
+		t.Fatalf("ListOfficialSkills() err = %v, want HTTP status", result.Err)
+	}
+}
+
+func TestListOfficialSkillsTooLargeFails(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		_, _ = w.Write([]byte(strings.Repeat("x", officialSkillsIndexMaxBytes+1)))
+	}))
+	defer server.Close()
+
+	oldURL := officialSkillsIndexURL
+	officialSkillsIndexURL = server.URL + "/.well-known/skills/index.json"
+	defer func() { officialSkillsIndexURL = oldURL }()
+
+	u := New()
+	result := u.ListOfficialSkills()
+	if result.Err == nil {
+		t.Fatal("ListOfficialSkills() err = nil, want error")
+	}
+	if !strings.Contains(result.Err.Error(), "exceeds") {
+		t.Fatalf("ListOfficialSkills() err = %v, want size limit error", result.Err)
+	}
+}
+
+func TestInstallSkillRejectsInvalidOfficialNames(t *testing.T) {
+	called := false
+	u := &Updater{
 		SkillsCommandOverride: func(args ...string) *NpmResult {
-			called = append(called, strings.Join(args, " "))
-			r := &NpmResult{}
-			if strings.Contains(strings.Join(args, " "), "https://open.feishu.cn") {
-				r.Err = fmt.Errorf("primary failed")
-				return r
-			}
-			r.Stdout.WriteString("lark-calendar\n")
-			return r
+			called = true
+			return &NpmResult{}
 		},
 	}
 
-	result := updater.ListOfficialSkills()
-	if result.Err != nil {
-		t.Fatalf("ListOfficialSkills() err = %v, want nil", result.Err)
+	result := u.InstallSkill([]string{"lark-calendar", "lark-calendar@evil"})
+	if result.Err == nil {
+		t.Fatal("InstallSkill() err = nil, want invalid name error")
 	}
-	if len(called) != 2 {
-		t.Fatalf("called %d commands, want 2: %#v", len(called), called)
+	if !strings.Contains(result.Err.Error(), "invalid official skill name") {
+		t.Fatalf("InstallSkill() err = %v, want invalid name error", result.Err)
 	}
-	if !strings.Contains(called[1], "larksuite/cli --list") {
-		t.Fatalf("fallback call = %q, want larksuite/cli --list", called[1])
+	if called {
+		t.Fatal("InstallSkill() called skills command for invalid name")
 	}
 }
diff --git a/internal/skillscheck/sync.go b/internal/skillscheck/sync.go
index f2d2a2cf8..d025f4798 100644
--- a/internal/skillscheck/sync.go
+++ b/internal/skillscheck/sync.go
@@ -4,6 +4,7 @@
 package skillscheck
 
 import (
+	"encoding/json"
 	"fmt"
 	"regexp"
 	"sort"
@@ -14,8 +15,9 @@ import (
 )
 
 var (
-	skillNamePattern = regexp.MustCompile(`^[A-Za-z0-9][A-Za-z0-9_:-]*(@[^\s]+)?$`)
-	ansiPattern      = regexp.MustCompile(`\x1b\[[0-?]*[ -/]*[@-~]`)
+	skillNamePattern         = regexp.MustCompile(`^[A-Za-z0-9][A-Za-z0-9_:-]*(@[^\s]+)?$`)
+	officialSkillNamePattern = regexp.MustCompile(`^lark-[a-z0-9](?:[a-z0-9-]*[a-z0-9])?$`)
+	ansiPattern              = regexp.MustCompile(`\x1b\[[0-?]*[ -/]*[@-~]`)
 )
 
 type SyncInput struct {
@@ -41,6 +43,10 @@ func stripANSI(s string) string {
 
 func ParseSkillsList(text string) []string {
 	text = stripANSI(text)
+	if skills := parseOfficialSkillsIndex(text); skills != nil {
+		return skills
+	}
+
 	lines := strings.Split(text, "\n")
 
 	// Detect format type
@@ -57,6 +63,40 @@ func ParseSkillsList(text string) []string {
 	return nil
 }
 
+type officialSkillsIndex struct {
+	Skills []map[string]interface{} `json:"skills"`
+}
+
+func parseOfficialSkillsIndex(text string) []string {
+	trimmed := strings.TrimSpace(text)
+	if trimmed == "" || !strings.HasPrefix(trimmed, "{") {
+		return nil
+	}
+
+	var index officialSkillsIndex
+	if err := json.Unmarshal([]byte(trimmed), &index); err != nil {
+		return nil
+	}
+	if index.Skills == nil {
+		return nil
+	}
+
+	seen := map[string]bool{}
+	for _, skill := range index.Skills {
+		name, ok := skill["name"].(string)
+		if !ok {
+			continue
+		}
+		name = strings.TrimSpace(name)
+		if !officialSkillNamePattern.MatchString(name) {
+			continue
+		}
+		seen[name] = true
+	}
+
+	return sortedKeys(seen)
+}
+
 // parseGlobalSkillsList parses the output of "npx -y skills ls -g"
 func parseGlobalSkillsList(lines []string) []string {
 	seen := map[string]bool{}
diff --git a/internal/skillscheck/sync_test.go b/internal/skillscheck/sync_test.go
index 18a2802c6..0a2e3f343 100644
--- a/internal/skillscheck/sync_test.go
+++ b/internal/skillscheck/sync_test.go
@@ -8,6 +8,7 @@ import (
 	"os"
 	"path/filepath"
 	"reflect"
+	"strconv"
 	"strings"
 	"testing"
 	"time"
@@ -67,6 +68,56 @@ func TestParseGlobalSkillsListWithANSI(t *testing.T) {
 	}
 }
 
+func TestParseSkillsListOfficialJSONIndex(t *testing.T) {
+	input := `{
+		"skills": [
+			{"name": "lark-mail", "description": "Mail", "files": ["SKILL.md"]},
+			{"name": "lark-calendar", "description": "Calendar", "files": ["SKILL.md"]},
+			{"name": "lark-mail", "description": "Duplicate", "files": ["SKILL.md"]}
+		]
+	}`
+
+	got := ParseSkillsList(input)
+	want := []string{"lark-calendar", "lark-mail"}
+	if !reflect.DeepEqual(got, want) {
+		t.Fatalf("ParseSkillsList() JSON index = %#v, want %#v", got, want)
+	}
+}
+
+func TestParseSkillsListOfficialJSONIndexIgnoresInvalidNames(t *testing.T) {
+	input := `{
+		"skills": [
+			{"name": " lark-calendar "},
+			{"name": "custom-skill"},
+			{"name": "lark-bad name"},
+			{"name": "lark-../../evil"},
+			{"name": "lark-calendar@evil"},
+			{"name": "lark-calendar:evil"},
+			{"name": "lark-calendar/evil"},
+			{"name": "lark-calendar..evil"},
+			{"name": "lark-calendar_evil"},
+			{"name": ""},
+			{"description": "missing name"},
+			{"name": 42}
+		]
+	}`
+
+	got := ParseSkillsList(input)
+	want := []string{"lark-calendar"}
+	if !reflect.DeepEqual(got, want) {
+		t.Fatalf("ParseSkillsList() JSON index invalid names = %#v, want %#v", got, want)
+	}
+}
+
+func TestParseOfficialSkillsListLegacyAvailableSkills(t *testing.T) {
+	input := "Available Skills\n │    lark-calendar\n │    lark-mail\n"
+	got := ParseSkillsList(input)
+	want := []string{"lark-calendar", "lark-mail"}
+	if !reflect.DeepEqual(got, want) {
+		t.Fatalf("ParseSkillsList() legacy Available Skills = %#v, want %#v", got, want)
+	}
+}
+
 func TestPlanNormal_WithReadableStatePreservesDeletedAndAddsNew(t *testing.T) {
 	previous := &SkillsState{OfficialSkills: []string{"lark-calendar", "lark-mail"}}
 	got := PlanSync(SyncInput{
@@ -125,12 +176,16 @@ type fakeSkillsRunner struct {
 
 func officialSkillsOutput(names ...string) string {
 	var b strings.Builder
-	b.WriteString("Available Skills\n")
-	for _, name := range names {
-		b.WriteString("│    ")
-		b.WriteString(name)
-		b.WriteString("\n")
-	}
+	b.WriteString(`{"skills":[`)
+	for i, name := range names {
+		if i > 0 {
+			b.WriteString(",")
+		}
+		b.WriteString(`{"name":`)
+		b.WriteString(strconv.Quote(name))
+		b.WriteString(`,"description":"","files":["SKILL.md"]}`)
+	}
+	b.WriteString(`]}`)
 	return b.String()
 }