diff --git a/internal/ai/runtime/internal/impl/factory/instruction_providers.go b/internal/ai/runtime/internal/impl/factory/instruction_providers.go
index be4b521..ce3427c 100644
--- a/internal/ai/runtime/internal/impl/factory/instruction_providers.go
+++ b/internal/ai/runtime/internal/impl/factory/instruction_providers.go
@@ -1,6 +1,8 @@
 package factory
 
 import (
+	"os"
+	"path/filepath"
 	"strings"
 
 	einoadapter "cs-agent/internal/ai/runtime/internal/impl/adapter"
@@ -8,16 +10,57 @@ import (
 	"cs-agent/internal/pkg/toolx"
 )
 
-type ProjectInstructionProvider struct{}
+type ProjectInstructionProvider struct {
+	fileName string
+}
 
+// TODO 这个要读取AGENTS.md文件，后面考虑还要不要
 func NewProjectInstructionProvider() *ProjectInstructionProvider {
-	return &ProjectInstructionProvider{}
+	return &ProjectInstructionProvider{fileName: "AGENTS.md"}
 }
 
 func (p *ProjectInstructionProvider) Resolve() string {
+	if text := p.loadFromFile(); text != "" {
+		return text
+	}
 	return strings.TrimSpace(DefaultProjectInstruction)
 }
 
+func (p *ProjectInstructionProvider) loadFromFile() string {
+	path := p.resolvePath()
+	if path == "" {
+		return ""
+	}
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return ""
+	}
+	return strings.TrimSpace(string(data))
+}
+
+func (p *ProjectInstructionProvider) resolvePath() string {
+	fileName := "AGENTS.md"
+	if p != nil && strings.TrimSpace(p.fileName) != "" {
+		fileName = strings.TrimSpace(p.fileName)
+	}
+	wd, err := os.Getwd()
+	if err != nil {
+		return ""
+	}
+	dir := wd
+	for {
+		candidate := filepath.Join(dir, fileName)
+		if stat, statErr := os.Stat(candidate); statErr == nil && !stat.IsDir() {
+			return candidate
+		}
+		parent := filepath.Dir(dir)
+		if parent == dir {
+			return ""
+		}
+		dir = parent
+	}
+}
+
 type ToolAppendixProvider struct{}
 
 func NewToolAppendixProvider() *ToolAppendixProvider {
diff --git a/internal/ai/runtime/internal/impl/factory/instruction_providers_test.go b/internal/ai/runtime/internal/impl/factory/instruction_providers_test.go
new file mode 100644
index 0000000..e77d473
--- /dev/null
+++ b/internal/ai/runtime/internal/impl/factory/instruction_providers_test.go
@@ -0,0 +1,48 @@
+package factory
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func TestProjectInstructionProviderResolveFromAgentsFile(t *testing.T) {
+	tmpDir := t.TempDir()
+	nestedDir := filepath.Join(tmpDir, "nested", "child")
+	if err := os.MkdirAll(nestedDir, 0o755); err != nil {
+		t.Fatalf("mkdir failed: %v", err)
+	}
+	content := "# AGENTS.md\n\nfrom temp file"
+	if err := os.WriteFile(filepath.Join(tmpDir, "AGENTS.md"), []byte(content), 0o644); err != nil {
+		t.Fatalf("write file failed: %v", err)
+	}
+	wd, err := os.Getwd()
+	if err != nil {
+		t.Fatalf("getwd failed: %v", err)
+	}
+	defer func() { _ = os.Chdir(wd) }()
+	if err := os.Chdir(nestedDir); err != nil {
+		t.Fatalf("chdir failed: %v", err)
+	}
+	got := NewProjectInstructionProvider().Resolve()
+	if !strings.Contains(got, "from temp file") {
+		t.Fatalf("expected provider to load AGENTS.md from file, got: %s", got)
+	}
+}
+
+func TestProjectInstructionProviderFallbacksToDefault(t *testing.T) {
+	tmpDir := t.TempDir()
+	wd, err := os.Getwd()
+	if err != nil {
+		t.Fatalf("getwd failed: %v", err)
+	}
+	defer func() { _ = os.Chdir(wd) }()
+	if err := os.Chdir(tmpDir); err != nil {
+		t.Fatalf("chdir failed: %v", err)
+	}
+	got := NewProjectInstructionProvider().Resolve()
+	if !strings.Contains(got, "本文件定义本项目内 AI Agent 的强制开发规则") {
+		t.Fatalf("expected fallback project instruction, got: %s", got)
+	}
+}
diff --git a/internal/ai/runtime/internal/impl/factory/project_instruction.go b/internal/ai/runtime/internal/impl/factory/project_instruction.go
index 97f3528..65e6522 100644
--- a/internal/ai/runtime/internal/impl/factory/project_instruction.go
+++ b/internal/ai/runtime/internal/impl/factory/project_instruction.go
@@ -2,8 +2,7 @@ package factory
 
 // DefaultProjectInstruction 为当前项目统一注入的全局项目规则。
 //
-// 当前阶段不再从文件系统读取 AGENTS.md，也不依赖 SystemConfig；
-// 所有客服 Agent 运行时默认使用本常量作为项目级规则来源。
+// 默认回退到内置常量；运行时优先由 ProjectInstructionProvider 读取仓库中的 AGENTS.md。
 // TODO 这个内容不合适，需要重新整理内容，内容需要面向客服系统
 const DefaultProjectInstruction = `# AGENTS.md