diff --git a/cmd/clawgo/cmd_gateway.go b/cmd/clawgo/cmd_gateway.go
index 4658e84..2db5fa9 100644
--- a/cmd/clawgo/cmd_gateway.go
+++ b/cmd/clawgo/cmd_gateway.go
@@ -972,6 +972,7 @@ func buildAutonomyEngine(cfg *config.Config, msgBus *bus.MessageBus) *autonomy.E
 		ImportantKeywords:           cfg.Agents.Defaults.Texts.AutonomyImportantKeywords,
 		CompletionTemplate:          cfg.Agents.Defaults.Texts.AutonomyCompletionTemplate,
 		BlockedTemplate:             cfg.Agents.Defaults.Texts.AutonomyBlockedTemplate,
+		EKGConsecutiveErrorThreshold: 3,
 		Workspace:                   cfg.WorkspacePath(),
 		DefaultNotifyChannel:        notifyChannel,
 		DefaultNotifyChatID:         notifyChatID,
diff --git a/docs/ekg-design.md b/docs/ekg-design.md
new file mode 100644
index 0000000..47ba293
--- /dev/null
+++ b/docs/ekg-design.md
@@ -0,0 +1,97 @@
+# EKG 设计稿（Execution Knowledge Graph）
+
+> 目标：在不引入重型图数据库的前提下，为 ClawGo 提供“可审计、可回放、可降错”的执行知识图谱能力，优先降低 agent 重复报错与自治死循环。
+
+## 1. 范围与阶段
+
+### M1（本次实现）
+- 记录执行结果事件（成功/失败/抑制）到 `memory/ekg-events.jsonl`
+- 对错误文本做签名归一化（errsig）
+- 在自治引擎中读取 advice：同任务同 errsig 连续失败达到阈值时，直接阻断重试（避免死循环）
+
+### M2（后续）
+- provider/model/tool 维度的成功率建议（preferred / banned）
+- channel/source 维度的策略分层
+
+### M3（后续）
+- WAL + 快照（snapshot）
+- WebUI 可视化（errsig 热点、抑制命中率）
+
+---
+
+## 2. 数据模型（接口草图）
+
+```go
+type Event struct {
+    Time    string `json:"time"`
+    TaskID  string `json:"task_id,omitempty"`
+    Session string `json:"session,omitempty"`
+    Channel string `json:"channel,omitempty"`
+    Source  string `json:"source,omitempty"`
+    Status  string `json:"status"` // success|error|suppressed
+    ErrSig  string `json:"errsig,omitempty"`
+    Log     string `json:"log,omitempty"`
+}
+
+type Advice struct {
+    ShouldEscalate bool     `json:"should_escalate"`
+    RetryBackoffSec int     `json:"retry_backoff_sec"`
+    Reason         []string `json:"reason"`
+}
+
+type SignalContext struct {
+    TaskID  string
+    ErrSig  string
+    Source  string
+    Channel string
+}
+```
+
+---
+
+## 3. 存储与性能
+
+- 存储：`memory/ekg-events.jsonl`（append-only）
+- 读取：仅扫描最近窗口（默认 2000 行）
+- 复杂度：O(N_recent)
+- 设计取舍：M1 以正确性优先，后续再加入 snapshot 与索引
+
+---
+
+## 4. 规则（M1）
+
+- 错误签名归一化：
+  - 路径归一化 `<path>`
+  - 数字归一化 `<n>`
+  - hex 归一化 `<hex>`
+  - 空白压缩
+- 阈值规则：
+  - 若 `task_id + errsig` 连续 `>=3` 次 error，则
+  - `ShouldEscalate=true`，自治任务进入 `blocked:repeated_error_signature`
+
+---
+
+## 5. 接入点
+
+1) `pkg/agent/loop.go`
+- 在 `appendTaskAuditEvent` 处同步写入 EKG 事件（与 task-audit 同步）
+
+2) `pkg/autonomy/engine.go`
+- 在运行结果为 error 的分支读取 EKG advice
+- 命中升级条件时，直接阻断重试并标记 block reason
+
+---
+
+## 6. 风险与回滚
+
+- 风险：阈值过低导致过早阻断
+- 缓解：默认阈值 3，且仅在同 task+同 errsig 命中时触发
+- 回滚：移除 advice 判断即可恢复原重试路径
+
+---
+
+## 7. 验收标准（M1）
+
+- 能生成并追加 `memory/ekg-events.jsonl`
+- 相同任务在相同错误签名下连续失败 3 次后，自治不再继续循环 dispatch
+- `make test`（Docker compile）通过
diff --git a/pkg/agent/loop.go b/pkg/agent/loop.go
index 414400c..77c26ef 100644
--- a/pkg/agent/loop.go
+++ b/pkg/agent/loop.go
@@ -23,6 +23,7 @@ import (
 	"clawgo/pkg/bus"
 	"clawgo/pkg/config"
 	"clawgo/pkg/cron"
+	"clawgo/pkg/ekg"
 	"clawgo/pkg/logger"
 	"clawgo/pkg/nodes"
 	"clawgo/pkg/providers"
@@ -60,6 +61,7 @@ type AgentLoop struct {
 	sessionRunLocks       map[string]*sync.Mutex
 	providerNames         []string
 	providerPool          map[string]providers.LLMProvider
+	ekg                   *ekg.Engine
 }
 
 // StartupCompactionReport provides startup memory/session maintenance stats.
@@ -236,6 +238,7 @@ func NewAgentLoop(cfg *config.Config, msgBus *bus.MessageBus, provider providers
 		running:               false,
 		intentHints:           map[string]string{},
 		sessionRunLocks:       map[string]*sync.Mutex{},
+		ekg:                   ekg.New(workspace),
 	}
 
 	// Initialize provider fallback chain (primary + proxy_fallbacks).
@@ -435,6 +438,17 @@ func (al *AgentLoop) appendTaskAuditEvent(taskID string, msg bus.InboundMessage,
 		"media_count":   len(msg.MediaItems),
 		"media_items":   msg.MediaItems,
 	}
+	if al.ekg != nil {
+		al.ekg.Record(ekg.Event{
+			TaskID:  taskID,
+			Session: msg.SessionKey,
+			Channel: msg.Channel,
+			Source:  source,
+			Status:  status,
+			Log:     logText,
+		})
+	}
+
 	b, _ := json.Marshal(row)
 	f, err := os.OpenFile(path, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0644)
 	if err != nil {
diff --git a/pkg/autonomy/engine.go b/pkg/autonomy/engine.go
index e5956be..0559eb3 100644
--- a/pkg/autonomy/engine.go
+++ b/pkg/autonomy/engine.go
@@ -16,6 +16,7 @@ import (
 	"time"
 
 	"clawgo/pkg/bus"
+	"clawgo/pkg/ekg"
 	"clawgo/pkg/lifecycle"
 )
 
@@ -41,6 +42,7 @@ type Options struct {
 	ImportantKeywords           []string
 	CompletionTemplate          string
 	BlockedTemplate             string
+	EKGConsecutiveErrorThreshold int
 }
 
 type taskState struct {
@@ -75,6 +77,7 @@ type Engine struct {
 	roundsWithoutUser int
 	lastDailyReportDate string
 	lastHistoryCleanupAt time.Time
+	ekg                 *ekg.Engine
 }
 
 func NewEngine(opts Options, msgBus *bus.MessageBus) *Engine {
@@ -111,7 +114,10 @@ func NewEngine(opts Options, msgBus *bus.MessageBus) *Engine {
 	if opts.TaskHistoryRetentionDays <= 0 {
 		opts.TaskHistoryRetentionDays = 3
 	}
-	return &Engine{
+	if opts.EKGConsecutiveErrorThreshold <= 0 {
+		opts.EKGConsecutiveErrorThreshold = 3
+	}
+	eng := &Engine{
 		opts:       opts,
 		bus:        msgBus,
 		runner:     lifecycle.NewLoopRunner(),
@@ -119,7 +125,12 @@ func NewEngine(opts Options, msgBus *bus.MessageBus) *Engine {
 		state:      map[string]*taskState{},
 		lastNotify: map[string]time.Time{},
 		lockOwners: map[string]string{},
+		ekg:        ekg.New(opts.Workspace),
 	}
+	if eng.ekg != nil {
+		eng.ekg.SetConsecutiveErrorThreshold(opts.EKGConsecutiveErrorThreshold)
+	}
+	return eng
 }
 
 func (e *Engine) Start() {
@@ -319,7 +330,18 @@ func (e *Engine) tick() {
 					continue
 				}
 				if outcome == "error" {
+					errSig := e.latestErrorSignature(st.ID, st.LastRunAt)
+					advice := ekg.Advice{}
+					if e.ekg != nil {
+						advice = e.ekg.GetAdvice(ekg.SignalContext{TaskID: st.ID, ErrSig: errSig, Source: "autonomy", Channel: "system"})
+					}
 					st.Status = "blocked"
+					if advice.ShouldEscalate {
+						st.BlockReason = "repeated_error_signature"
+						st.RetryAfter = now.Add(5 * time.Minute)
+						e.sendFailureNotification(st, "repeated error signature detected; escalate")
+						continue
+					}
 					st.BlockReason = "last_run_error"
 					st.RetryAfter = now.Add(blockedRetryBackoff(st.ConsecutiveStall+1, e.opts.MinRunIntervalSec))
 					e.sendFailureNotification(st, "last run ended with error")
@@ -1113,6 +1135,47 @@ func (e *Engine) detectRunOutcome(taskID string, since time.Time) (string, bool)
 	return latest, true
 }
 
+func (e *Engine) latestErrorSignature(taskID string, since time.Time) string {
+	if e.opts.Workspace == "" || taskID == "" {
+		return ""
+	}
+	path := filepath.Join(e.opts.Workspace, "memory", "task-audit.jsonl")
+	f, err := os.Open(path)
+	if err != nil {
+		return ""
+	}
+	defer f.Close()
+	sessionKey := "autonomy:" + taskID
+	latestAt := time.Time{}
+	latestErr := ""
+	s := bufio.NewScanner(f)
+	for s.Scan() {
+		var row map[string]interface{}
+		if json.Unmarshal(s.Bytes(), &row) != nil {
+			continue
+		}
+		if fmt.Sprintf("%v", row["session"]) != sessionKey {
+			continue
+		}
+		if fmt.Sprintf("%v", row["status"]) != "error" {
+			continue
+		}
+		ts := fmt.Sprintf("%v", row["time"])
+		tm, err := time.Parse(time.RFC3339, ts)
+		if err != nil {
+			continue
+		}
+		if !since.IsZero() && tm.Before(since) {
+			continue
+		}
+		if latestAt.IsZero() || tm.After(latestAt) {
+			latestAt = tm
+			latestErr = fmt.Sprintf("%v", row["log"])
+		}
+	}
+	return ekg.NormalizeErrorSignature(latestErr)
+}
+
 func parseTodoAttributes(content string) (priority, dueAt, normalized string) {
 	priority = "normal"
 	normalized = content
diff --git a/pkg/ekg/engine.go b/pkg/ekg/engine.go
new file mode 100644
index 0000000..0a9a2ba
--- /dev/null
+++ b/pkg/ekg/engine.go
@@ -0,0 +1,186 @@
+package ekg
+
+import (
+	"bufio"
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"regexp"
+	"strings"
+	"time"
+)
+
+type Event struct {
+	Time    string `json:"time"`
+	TaskID  string `json:"task_id,omitempty"`
+	Session string `json:"session,omitempty"`
+	Channel string `json:"channel,omitempty"`
+	Source  string `json:"source,omitempty"`
+	Status  string `json:"status"` // success|error|suppressed
+	ErrSig  string `json:"errsig,omitempty"`
+	Log     string `json:"log,omitempty"`
+}
+
+type SignalContext struct {
+	TaskID  string
+	ErrSig  string
+	Source  string
+	Channel string
+}
+
+type Advice struct {
+	ShouldEscalate  bool     `json:"should_escalate"`
+	RetryBackoffSec int      `json:"retry_backoff_sec"`
+	Reason          []string `json:"reason"`
+}
+
+type Engine struct {
+	path                      string
+	recentLines               int
+	consecutiveErrorThreshold int
+}
+
+func New(workspace string) *Engine {
+	p := filepath.Join(strings.TrimSpace(workspace), "memory", "ekg-events.jsonl")
+	return &Engine{path: p, recentLines: 2000, consecutiveErrorThreshold: 3}
+}
+
+func (e *Engine) SetConsecutiveErrorThreshold(v int) {
+	if e == nil {
+		return
+	}
+	if v <= 0 {
+		v = 3
+	}
+	e.consecutiveErrorThreshold = v
+}
+
+func (e *Engine) Record(ev Event) {
+	if e == nil || strings.TrimSpace(e.path) == "" {
+		return
+	}
+	if strings.TrimSpace(ev.Time) == "" {
+		ev.Time = time.Now().UTC().Format(time.RFC3339)
+	}
+	ev.TaskID = strings.TrimSpace(ev.TaskID)
+	ev.Session = strings.TrimSpace(ev.Session)
+	ev.Channel = strings.TrimSpace(ev.Channel)
+	ev.Source = strings.TrimSpace(ev.Source)
+	ev.Status = strings.TrimSpace(strings.ToLower(ev.Status))
+	if ev.ErrSig == "" && ev.Log != "" {
+		ev.ErrSig = NormalizeErrorSignature(ev.Log)
+	}
+	if ev.ErrSig != "" {
+		ev.ErrSig = NormalizeErrorSignature(ev.ErrSig)
+	}
+	_ = os.MkdirAll(filepath.Dir(e.path), 0o755)
+	b, err := json.Marshal(ev)
+	if err != nil {
+		return
+	}
+	f, err := os.OpenFile(e.path, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0o644)
+	if err != nil {
+		return
+	}
+	defer f.Close()
+	_, _ = f.Write(append(b, '\n'))
+}
+
+func (e *Engine) GetAdvice(ctx SignalContext) Advice {
+	adv := Advice{ShouldEscalate: false, RetryBackoffSec: 30, Reason: []string{}}
+	if e == nil {
+		return adv
+	}
+	taskID := strings.TrimSpace(ctx.TaskID)
+	errSig := NormalizeErrorSignature(ctx.ErrSig)
+	if taskID == "" || errSig == "" {
+		return adv
+	}
+	events := e.readRecentEvents()
+	if len(events) == 0 {
+		return adv
+	}
+	consecutive := 0
+	for i := len(events) - 1; i >= 0; i-- {
+		ev := events[i]
+		if strings.TrimSpace(ev.TaskID) != taskID {
+			continue
+		}
+		evErr := NormalizeErrorSignature(ev.ErrSig)
+		if evErr == "" {
+			evErr = NormalizeErrorSignature(ev.Log)
+		}
+		if evErr != errSig {
+			continue
+		}
+		if strings.ToLower(strings.TrimSpace(ev.Status)) == "error" {
+			consecutive++
+			if consecutive >= e.consecutiveErrorThreshold {
+				adv.ShouldEscalate = true
+				adv.RetryBackoffSec = 300
+				adv.Reason = append(adv.Reason, "repeated_error_signature")
+				adv.Reason = append(adv.Reason, "same task and error signature exceeded threshold")
+				return adv
+			}
+			continue
+		}
+		// Same signature but success/suppressed encountered: reset chain.
+		break
+	}
+	return adv
+}
+
+func (e *Engine) readRecentEvents() []Event {
+	if strings.TrimSpace(e.path) == "" {
+		return nil
+	}
+	f, err := os.Open(e.path)
+	if err != nil {
+		return nil
+	}
+	defer f.Close()
+	lines := make([]string, 0, e.recentLines)
+	s := bufio.NewScanner(f)
+	for s.Scan() {
+		line := strings.TrimSpace(s.Text())
+		if line == "" {
+			continue
+		}
+		lines = append(lines, line)
+		if len(lines) > e.recentLines {
+			lines = lines[1:]
+		}
+	}
+	out := make([]Event, 0, len(lines))
+	for _, l := range lines {
+		var ev Event
+		if json.Unmarshal([]byte(l), &ev) == nil {
+			out = append(out, ev)
+		}
+	}
+	return out
+}
+
+var (
+	rePathNum = regexp.MustCompile(`\b\d+\b`)
+	rePathHex = regexp.MustCompile(`\b0x[0-9a-fA-F]+\b`)
+	rePathWin = regexp.MustCompile(`[a-zA-Z]:\\[^\s]+`)
+	rePathNix = regexp.MustCompile(`/[^\s]+`)
+	reSpace   = regexp.MustCompile(`\s+`)
+)
+
+func NormalizeErrorSignature(s string) string {
+	s = strings.TrimSpace(strings.ToLower(s))
+	if s == "" {
+		return ""
+	}
+	s = rePathWin.ReplaceAllString(s, "<path>")
+	s = rePathNix.ReplaceAllString(s, "<path>")
+	s = rePathHex.ReplaceAllString(s, "<hex>")
+	s = rePathNum.ReplaceAllString(s, "<n>")
+	s = reSpace.ReplaceAllString(s, " ")
+	if len(s) > 240 {
+		s = s[:240]
+	}
+	return s
+}