diff --git a/README.md b/README.md
index d5ad05c..e4a3047 100644
--- a/README.md
+++ b/README.md
@@ -42,6 +42,7 @@
 - `action=status|describe`：查看已配对节点状态与能力矩阵
 - `action=run|invoke|camera_snap|screen_record|location_get`：已接入路由框架
 - `mode=auto|p2p|relay`：默认 `auto`（优先 p2p，失败回退 relay）
+- relay 已接入本地 handler 调用链，便于逐步替换为真实跨节点传输
 
 实现位置：
 - `pkg/nodes/types.go`
diff --git a/README_EN.md b/README_EN.md
index 7d5e354..7ca15a2 100644
--- a/README_EN.md
+++ b/README_EN.md
@@ -42,6 +42,7 @@ A `nodes` tool control-plane PoC is now available:
 - `action=status|describe`: inspect paired node status and capability matrix
 - `action=run|invoke|camera_snap|screen_record|location_get`: routing framework is in place
 - `mode=auto|p2p|relay`: default `auto` (prefer p2p, fallback to relay)
+- relay now uses local handler invocation path, ready for real cross-node transport replacement
 
 Implementation:
 - `pkg/nodes/types.go`
diff --git a/pkg/agent/loop.go b/pkg/agent/loop.go
index 9d083c0..179838b 100644
--- a/pkg/agent/loop.go
+++ b/pkg/agent/loop.go
@@ -78,7 +78,11 @@ func NewAgentLoop(cfg *config.Config, msgBus *bus.MessageBus, provider providers
 	toolsRegistry.Register(tools.NewExecTool(cfg.Tools.Shell, workspace, processManager))
 	toolsRegistry.Register(tools.NewProcessTool(processManager))
 	nodesManager := nodes.NewManager()
-	nodesRouter := &nodes.Router{P2P: &nodes.StubP2PTransport{}, Relay: &nodes.StubRelayTransport{}}
+	nodesManager.Upsert(nodes.NodeInfo{ID: "local", Name: "local", Capabilities: nodes.Capabilities{Run: true, Invoke: true}, Online: true})
+	nodesManager.RegisterHandler("local", func(req nodes.Request) nodes.Response {
+		return nodes.Response{OK: true, Node: "local", Action: req.Action, Payload: map[string]interface{}{"echo": req.Args, "transport": "relay-local"}}
+	})
+	nodesRouter := &nodes.Router{P2P: &nodes.StubP2PTransport{}, Relay: &nodes.StubRelayTransport{Manager: nodesManager}}
 	toolsRegistry.Register(tools.NewNodesTool(nodesManager, nodesRouter))
 
 	if cs != nil {
diff --git a/pkg/nodes/manager.go b/pkg/nodes/manager.go
index a475dcf..0fa88cc 100644
--- a/pkg/nodes/manager.go
+++ b/pkg/nodes/manager.go
@@ -2,18 +2,22 @@ package nodes
 
 import (
 	"sort"
+	"strings"
 	"sync"
 	"time"
 )
 
 // Manager keeps paired node metadata and basic routing helpers.
+type Handler func(req Request) Response
+
 type Manager struct {
-	mu    sync.RWMutex
-	nodes map[string]NodeInfo
+	mu       sync.RWMutex
+	nodes    map[string]NodeInfo
+	handlers map[string]Handler
 }
 
 func NewManager() *Manager {
-	return &Manager{nodes: map[string]NodeInfo{}}
+	return &Manager{nodes: map[string]NodeInfo{}, handlers: map[string]Handler{}}
 }
 
 func (m *Manager) Upsert(info NodeInfo) {
@@ -51,6 +55,32 @@ func (m *Manager) List() []NodeInfo {
 	return out
 }
 
+func (m *Manager) RegisterHandler(nodeID string, h Handler) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if strings.TrimSpace(nodeID) == "" || h == nil {
+		return
+	}
+	m.handlers[nodeID] = h
+}
+
+func (m *Manager) Invoke(req Request) (Response, bool) {
+	m.mu.RLock()
+	h, ok := m.handlers[req.Node]
+	m.mu.RUnlock()
+	if !ok {
+		return Response{}, false
+	}
+	resp := h(req)
+	if strings.TrimSpace(resp.Node) == "" {
+		resp.Node = req.Node
+	}
+	if strings.TrimSpace(resp.Action) == "" {
+		resp.Action = req.Action
+	}
+	return resp, true
+}
+
 func (m *Manager) PickFor(action string) (NodeInfo, bool) {
 	m.mu.RLock()
 	defer m.mu.RUnlock()
diff --git a/pkg/nodes/transport.go b/pkg/nodes/transport.go
index bc6a6e5..d75c994 100644
--- a/pkg/nodes/transport.go
+++ b/pkg/nodes/transport.go
@@ -57,10 +57,16 @@ func (s *StubP2PTransport) Send(ctx context.Context, req Request) (Response, err
 }
 
 // StubRelayTransport provides executable placeholder until real bridge lands.
-type StubRelayTransport struct{}
+type StubRelayTransport struct{ Manager *Manager }
 
 func (s *StubRelayTransport) Name() string { return "relay" }
 func (s *StubRelayTransport) Send(ctx context.Context, req Request) (Response, error) {
 	_ = ctx
-	return Response{OK: false, Node: req.Node, Action: req.Action, Error: "relay bridge not implemented yet"}, nil
+	if s.Manager == nil {
+		return Response{OK: false, Node: req.Node, Action: req.Action, Error: "relay manager not configured"}, nil
+	}
+	if resp, ok := s.Manager.Invoke(req); ok {
+		return resp, nil
+	}
+	return Response{OK: false, Node: req.Node, Action: req.Action, Error: "relay handler not found for node"}, nil
 }
diff --git a/pkg/tools/memory.go b/pkg/tools/memory.go
index c0a5946..387d9be 100644
--- a/pkg/tools/memory.go
+++ b/pkg/tools/memory.go
@@ -26,8 +26,9 @@ type memoryBlock struct {
 }
 
 type cachedMemoryFile struct {
-	modTime time.Time
-	blocks  []memoryBlock
+	modTime    time.Time
+	blocks     []memoryBlock
+	tokenIndex map[string][]int
 }
 
 func NewMemorySearchTool(workspace string) *MemorySearchTool {
@@ -206,12 +207,17 @@ func dedupeStrings(items []string) []string {
 
 // searchFile searches parsed markdown blocks with cache by file modtime.
 func (t *MemorySearchTool) searchFile(path string, keywords []string) ([]searchResult, error) {
-	blocks, err := t.getOrParseBlocks(path)
+	blocks, tokenIndex, err := t.getOrParseBlocks(path)
 	if err != nil {
 		return nil, err
 	}
+	candidate := candidateBlockIndexes(tokenIndex, keywords, len(blocks))
 	results := make([]searchResult, 0, 8)
-	for _, b := range blocks {
+	for _, idx := range candidate {
+		if idx < 0 || idx >= len(blocks) {
+			continue
+		}
+		b := blocks[idx]
 		score := 0
 		for _, kw := range keywords {
 			if strings.Contains(b.lower, kw) {
@@ -233,34 +239,35 @@ func (t *MemorySearchTool) searchFile(path string, keywords []string) ([]searchR
 	return results, nil
 }
 
-func (t *MemorySearchTool) getOrParseBlocks(path string) ([]memoryBlock, error) {
+func (t *MemorySearchTool) getOrParseBlocks(path string) ([]memoryBlock, map[string][]int, error) {
 	st, err := os.Stat(path)
 	if err != nil {
-		return nil, err
+		return nil, nil, err
 	}
 	mod := st.ModTime()
 	t.mu.RLock()
 	if c, ok := t.cache[path]; ok && c.modTime.Equal(mod) {
 		blocks := c.blocks
+		idx := c.tokenIndex
 		t.mu.RUnlock()
-		return blocks, nil
+		return blocks, idx, nil
 	}
 	t.mu.RUnlock()
 
-	blocks, err := parseMarkdownBlocks(path)
+	blocks, tokenIndex, err := parseMarkdownBlocks(path)
 	if err != nil {
-		return nil, err
+		return nil, nil, err
 	}
 	t.mu.Lock()
-	t.cache[path] = cachedMemoryFile{modTime: mod, blocks: blocks}
+	t.cache[path] = cachedMemoryFile{modTime: mod, blocks: blocks, tokenIndex: tokenIndex}
 	t.mu.Unlock()
-	return blocks, nil
+	return blocks, tokenIndex, nil
 }
 
-func parseMarkdownBlocks(path string) ([]memoryBlock, error) {
+func parseMarkdownBlocks(path string) ([]memoryBlock, map[string][]int, error) {
 	file, err := os.Open(path)
 	if err != nil {
-		return nil, err
+		return nil, nil, err
 	}
 	defer file.Close()
 
@@ -312,5 +319,78 @@ func parseMarkdownBlocks(path string) ([]memoryBlock, error) {
 		current.WriteString(line + "\n")
 	}
 	flush()
-	return blocks, nil
+	tokenIndex := buildTokenIndex(blocks)
+	return blocks, tokenIndex, nil
+}
+
+func buildTokenIndex(blocks []memoryBlock) map[string][]int {
+	idx := make(map[string][]int, 256)
+	for i, b := range blocks {
+		seen := map[string]struct{}{}
+		for _, tok := range tokenizeForIndex(b.lower + " " + strings.ToLower(b.heading)) {
+			if _, ok := seen[tok]; ok {
+				continue
+			}
+			seen[tok] = struct{}{}
+			idx[tok] = append(idx[tok], i)
+		}
+	}
+	return idx
+}
+
+func tokenizeForIndex(s string) []string {
+	s = strings.ToLower(strings.TrimSpace(s))
+	if s == "" {
+		return nil
+	}
+	s = strings.NewReplacer("\n", " ", "\t", " ", ",", " ", ".", " ", ":", " ", ";", " ", "(", " ", ")", " ", "[", " ", "]", " ", "{", " ", "}", " ", "`", " ", "\"", " ", "'", " ").Replace(s)
+	parts := strings.Fields(s)
+	out := make([]string, 0, len(parts))
+	for _, p := range parts {
+		if len(p) < 2 {
+			continue
+		}
+		out = append(out, p)
+	}
+	return out
+}
+
+func candidateBlockIndexes(tokenIndex map[string][]int, keywords []string, total int) []int {
+	if total <= 0 {
+		return nil
+	}
+	if len(keywords) == 0 || len(tokenIndex) == 0 {
+		out := make([]int, 0, total)
+		for i := 0; i < total; i++ {
+			out = append(out, i)
+		}
+		return out
+	}
+	candMap := map[int]int{}
+	for _, kw := range keywords {
+		kw = strings.TrimSpace(strings.ToLower(kw))
+		if kw == "" {
+			continue
+		}
+		for tok, ids := range tokenIndex {
+			if strings.Contains(tok, kw) {
+				for _, id := range ids {
+					candMap[id]++
+				}
+			}
+		}
+	}
+	if len(candMap) == 0 {
+		out := make([]int, 0, total)
+		for i := 0; i < total; i++ {
+			out = append(out, i)
+		}
+		return out
+	}
+	out := make([]int, 0, len(candMap))
+	for id := range candMap {
+		out = append(out, id)
+	}
+	sort.Slice(out, func(i, j int) bool { return candMap[out[i]] > candMap[out[j]] })
+	return out
 }