feat(agent): add agent socket API (#20717)

relates to: https://github.com/coder/internal/issues/1094

This is number 2 of 5 pull requests in an effort to add agent script
ordering. It adds a drpc API that is exposed via a local socket. This
API serves access to a lightweight DAG based dependency manager that was
inspired by systemd.

In follow-up PRs:

* This unit manager will be plumbed into the workspace agent struct.
* CLI commands will use this agentsocket api to express dependencies
between coder scripts

I used an LLM to produce some of these changes, but I have conducted
thorough self review and consider this contribution to be ready for an
external reviewer.

Makefile

@@ -642,6 +642,7 @@ AIBRIDGED_MOCKS := \
 GEN_FILES := \
 	tailnet/proto/tailnet.pb.go \
 	agent/proto/agent.pb.go \
+	agent/agentsocket/proto/agentsocket.pb.go \
 	provisionersdk/proto/provisioner.pb.go \
 	provisionerd/proto/provisionerd.pb.go \
 	vpn/vpn.pb.go \
@@ -696,6 +697,7 @@ gen/mark-fresh:
 		agent/proto/agent.pb.go \
 		provisionersdk/proto/provisioner.pb.go \
 		provisionerd/proto/provisionerd.pb.go \
+		agent/agentsocket/proto/agentsocket.pb.go \
 		vpn/vpn.pb.go \
 		enterprise/aibridged/proto/aibridged.pb.go \
 		coderd/database/dump.sql \
@@ -800,6 +802,14 @@ agent/proto/agent.pb.go: agent/proto/agent.proto
 		--go-drpc_opt=paths=source_relative \
 		./agent/proto/agent.proto
 
+agent/agentsocket/proto/agentsocket.pb.go: agent/agentsocket/proto/agentsocket.proto
+	protoc \
+		--go_out=. \
+		--go_opt=paths=source_relative \
+		--go-drpc_out=. \
+		--go-drpc_opt=paths=source_relative \
+		./agent/agentsocket/proto/agentsocket.proto
+
 provisionersdk/proto/provisioner.pb.go: provisionersdk/proto/provisioner.proto
 	protoc \
 		--go_out=. \

agent/agentsocket/proto/agentsocket.pb.go

@@ -0,0 +1,968 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.30.0
+// 	protoc        v4.23.4
+// source: agent/agentsocket/proto/agentsocket.proto
+
+package proto
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+type PingRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *PingRequest) Reset() {
+	*x = PingRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_agent_agentsocket_proto_agentsocket_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *PingRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PingRequest) ProtoMessage() {}
+
+func (x *PingRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_agent_agentsocket_proto_agentsocket_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use PingRequest.ProtoReflect.Descriptor instead.
+func (*PingRequest) Descriptor() ([]byte, []int) {
+	return file_agent_agentsocket_proto_agentsocket_proto_rawDescGZIP(), []int{0}
+}
+
+type PingResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *PingResponse) Reset() {
+	*x = PingResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_agent_agentsocket_proto_agentsocket_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *PingResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PingResponse) ProtoMessage() {}
+
+func (x *PingResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_agent_agentsocket_proto_agentsocket_proto_msgTypes[1]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use PingResponse.ProtoReflect.Descriptor instead.
+func (*PingResponse) Descriptor() ([]byte, []int) {
+	return file_agent_agentsocket_proto_agentsocket_proto_rawDescGZIP(), []int{1}
+}
+
+type SyncStartRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Unit string `protobuf:"bytes,1,opt,name=unit,proto3" json:"unit,omitempty"`
+}
+
+func (x *SyncStartRequest) Reset() {
+	*x = SyncStartRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_agent_agentsocket_proto_agentsocket_proto_msgTypes[2]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SyncStartRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SyncStartRequest) ProtoMessage() {}
+
+func (x *SyncStartRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_agent_agentsocket_proto_agentsocket_proto_msgTypes[2]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SyncStartRequest.ProtoReflect.Descriptor instead.
+func (*SyncStartRequest) Descriptor() ([]byte, []int) {
+	return file_agent_agentsocket_proto_agentsocket_proto_rawDescGZIP(), []int{2}
+}
+
+func (x *SyncStartRequest) GetUnit() string {
+	if x != nil {
+		return x.Unit
+	}
+	return ""
+}
+
+type SyncStartResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *SyncStartResponse) Reset() {
+	*x = SyncStartResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_agent_agentsocket_proto_agentsocket_proto_msgTypes[3]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SyncStartResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SyncStartResponse) ProtoMessage() {}
+
+func (x *SyncStartResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_agent_agentsocket_proto_agentsocket_proto_msgTypes[3]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SyncStartResponse.ProtoReflect.Descriptor instead.
+func (*SyncStartResponse) Descriptor() ([]byte, []int) {
+	return file_agent_agentsocket_proto_agentsocket_proto_rawDescGZIP(), []int{3}
+}
+
+type SyncWantRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Unit      string `protobuf:"bytes,1,opt,name=unit,proto3" json:"unit,omitempty"`
+	DependsOn string `protobuf:"bytes,2,opt,name=depends_on,json=dependsOn,proto3" json:"depends_on,omitempty"`
+}
+
+func (x *SyncWantRequest) Reset() {
+	*x = SyncWantRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_agent_agentsocket_proto_agentsocket_proto_msgTypes[4]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SyncWantRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SyncWantRequest) ProtoMessage() {}
+
+func (x *SyncWantRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_agent_agentsocket_proto_agentsocket_proto_msgTypes[4]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SyncWantRequest.ProtoReflect.Descriptor instead.
+func (*SyncWantRequest) Descriptor() ([]byte, []int) {
+	return file_agent_agentsocket_proto_agentsocket_proto_rawDescGZIP(), []int{4}
+}
+
+func (x *SyncWantRequest) GetUnit() string {
+	if x != nil {
+		return x.Unit
+	}
+	return ""
+}
+
+func (x *SyncWantRequest) GetDependsOn() string {
+	if x != nil {
+		return x.DependsOn
+	}
+	return ""
+}
+
+type SyncWantResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *SyncWantResponse) Reset() {
+	*x = SyncWantResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_agent_agentsocket_proto_agentsocket_proto_msgTypes[5]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SyncWantResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SyncWantResponse) ProtoMessage() {}
+
+func (x *SyncWantResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_agent_agentsocket_proto_agentsocket_proto_msgTypes[5]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SyncWantResponse.ProtoReflect.Descriptor instead.
+func (*SyncWantResponse) Descriptor() ([]byte, []int) {
+	return file_agent_agentsocket_proto_agentsocket_proto_rawDescGZIP(), []int{5}
+}
+
+type SyncCompleteRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Unit string `protobuf:"bytes,1,opt,name=unit,proto3" json:"unit,omitempty"`
+}
+
+func (x *SyncCompleteRequest) Reset() {
+	*x = SyncCompleteRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_agent_agentsocket_proto_agentsocket_proto_msgTypes[6]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SyncCompleteRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SyncCompleteRequest) ProtoMessage() {}
+
+func (x *SyncCompleteRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_agent_agentsocket_proto_agentsocket_proto_msgTypes[6]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SyncCompleteRequest.ProtoReflect.Descriptor instead.
+func (*SyncCompleteRequest) Descriptor() ([]byte, []int) {
+	return file_agent_agentsocket_proto_agentsocket_proto_rawDescGZIP(), []int{6}
+}
+
+func (x *SyncCompleteRequest) GetUnit() string {
+	if x != nil {
+		return x.Unit
+	}
+	return ""
+}
+
+type SyncCompleteResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *SyncCompleteResponse) Reset() {
+	*x = SyncCompleteResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_agent_agentsocket_proto_agentsocket_proto_msgTypes[7]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SyncCompleteResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SyncCompleteResponse) ProtoMessage() {}
+
+func (x *SyncCompleteResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_agent_agentsocket_proto_agentsocket_proto_msgTypes[7]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SyncCompleteResponse.ProtoReflect.Descriptor instead.
+func (*SyncCompleteResponse) Descriptor() ([]byte, []int) {
+	return file_agent_agentsocket_proto_agentsocket_proto_rawDescGZIP(), []int{7}
+}
+
+type SyncReadyRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Unit string `protobuf:"bytes,1,opt,name=unit,proto3" json:"unit,omitempty"`
+}
+
+func (x *SyncReadyRequest) Reset() {
+	*x = SyncReadyRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_agent_agentsocket_proto_agentsocket_proto_msgTypes[8]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SyncReadyRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SyncReadyRequest) ProtoMessage() {}
+
+func (x *SyncReadyRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_agent_agentsocket_proto_agentsocket_proto_msgTypes[8]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SyncReadyRequest.ProtoReflect.Descriptor instead.
+func (*SyncReadyRequest) Descriptor() ([]byte, []int) {
+	return file_agent_agentsocket_proto_agentsocket_proto_rawDescGZIP(), []int{8}
+}
+
+func (x *SyncReadyRequest) GetUnit() string {
+	if x != nil {
+		return x.Unit
+	}
+	return ""
+}
+
+type SyncReadyResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Ready bool `protobuf:"varint,1,opt,name=ready,proto3" json:"ready,omitempty"`
+}
+
+func (x *SyncReadyResponse) Reset() {
+	*x = SyncReadyResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_agent_agentsocket_proto_agentsocket_proto_msgTypes[9]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SyncReadyResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SyncReadyResponse) ProtoMessage() {}
+
+func (x *SyncReadyResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_agent_agentsocket_proto_agentsocket_proto_msgTypes[9]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SyncReadyResponse.ProtoReflect.Descriptor instead.
+func (*SyncReadyResponse) Descriptor() ([]byte, []int) {
+	return file_agent_agentsocket_proto_agentsocket_proto_rawDescGZIP(), []int{9}
+}
+
+func (x *SyncReadyResponse) GetReady() bool {
+	if x != nil {
+		return x.Ready
+	}
+	return false
+}
+
+type SyncStatusRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Unit string `protobuf:"bytes,1,opt,name=unit,proto3" json:"unit,omitempty"`
+}
+
+func (x *SyncStatusRequest) Reset() {
+	*x = SyncStatusRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_agent_agentsocket_proto_agentsocket_proto_msgTypes[10]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SyncStatusRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SyncStatusRequest) ProtoMessage() {}
+
+func (x *SyncStatusRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_agent_agentsocket_proto_agentsocket_proto_msgTypes[10]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SyncStatusRequest.ProtoReflect.Descriptor instead.
+func (*SyncStatusRequest) Descriptor() ([]byte, []int) {
+	return file_agent_agentsocket_proto_agentsocket_proto_rawDescGZIP(), []int{10}
+}
+
+func (x *SyncStatusRequest) GetUnit() string {
+	if x != nil {
+		return x.Unit
+	}
+	return ""
+}
+
+type DependencyInfo struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Unit           string `protobuf:"bytes,1,opt,name=unit,proto3" json:"unit,omitempty"`
+	DependsOn      string `protobuf:"bytes,2,opt,name=depends_on,json=dependsOn,proto3" json:"depends_on,omitempty"`
+	RequiredStatus string `protobuf:"bytes,3,opt,name=required_status,json=requiredStatus,proto3" json:"required_status,omitempty"`
+	CurrentStatus  string `protobuf:"bytes,4,opt,name=current_status,json=currentStatus,proto3" json:"current_status,omitempty"`
+	IsSatisfied    bool   `protobuf:"varint,5,opt,name=is_satisfied,json=isSatisfied,proto3" json:"is_satisfied,omitempty"`
+}
+
+func (x *DependencyInfo) Reset() {
+	*x = DependencyInfo{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_agent_agentsocket_proto_agentsocket_proto_msgTypes[11]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *DependencyInfo) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*DependencyInfo) ProtoMessage() {}
+
+func (x *DependencyInfo) ProtoReflect() protoreflect.Message {
+	mi := &file_agent_agentsocket_proto_agentsocket_proto_msgTypes[11]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use DependencyInfo.ProtoReflect.Descriptor instead.
+func (*DependencyInfo) Descriptor() ([]byte, []int) {
+	return file_agent_agentsocket_proto_agentsocket_proto_rawDescGZIP(), []int{11}
+}
+
+func (x *DependencyInfo) GetUnit() string {
+	if x != nil {
+		return x.Unit
+	}
+	return ""
+}
+
+func (x *DependencyInfo) GetDependsOn() string {
+	if x != nil {
+		return x.DependsOn
+	}
+	return ""
+}
+
+func (x *DependencyInfo) GetRequiredStatus() string {
+	if x != nil {
+		return x.RequiredStatus
+	}
+	return ""
+}
+
+func (x *DependencyInfo) GetCurrentStatus() string {
+	if x != nil {
+		return x.CurrentStatus
+	}
+	return ""
+}
+
+func (x *DependencyInfo) GetIsSatisfied() bool {
+	if x != nil {
+		return x.IsSatisfied
+	}
+	return false
+}
+
+type SyncStatusResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Status       string            `protobuf:"bytes,1,opt,name=status,proto3" json:"status,omitempty"`
+	IsReady      bool              `protobuf:"varint,2,opt,name=is_ready,json=isReady,proto3" json:"is_ready,omitempty"`
+	Dependencies []*DependencyInfo `protobuf:"bytes,3,rep,name=dependencies,proto3" json:"dependencies,omitempty"`
+}
+
+func (x *SyncStatusResponse) Reset() {
+	*x = SyncStatusResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_agent_agentsocket_proto_agentsocket_proto_msgTypes[12]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SyncStatusResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SyncStatusResponse) ProtoMessage() {}
+
+func (x *SyncStatusResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_agent_agentsocket_proto_agentsocket_proto_msgTypes[12]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SyncStatusResponse.ProtoReflect.Descriptor instead.
+func (*SyncStatusResponse) Descriptor() ([]byte, []int) {
+	return file_agent_agentsocket_proto_agentsocket_proto_rawDescGZIP(), []int{12}
+}
+
+func (x *SyncStatusResponse) GetStatus() string {
+	if x != nil {
+		return x.Status
+	}
+	return ""
+}
+
+func (x *SyncStatusResponse) GetIsReady() bool {
+	if x != nil {
+		return x.IsReady
+	}
+	return false
+}
+
+func (x *SyncStatusResponse) GetDependencies() []*DependencyInfo {
+	if x != nil {
+		return x.Dependencies
+	}
+	return nil
+}
+
+var File_agent_agentsocket_proto_agentsocket_proto protoreflect.FileDescriptor
+
+var file_agent_agentsocket_proto_agentsocket_proto_rawDesc = []byte{
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+}
+
+var (
+	file_agent_agentsocket_proto_agentsocket_proto_rawDescOnce sync.Once
+	file_agent_agentsocket_proto_agentsocket_proto_rawDescData = file_agent_agentsocket_proto_agentsocket_proto_rawDesc
+)
+
+func file_agent_agentsocket_proto_agentsocket_proto_rawDescGZIP() []byte {
+	file_agent_agentsocket_proto_agentsocket_proto_rawDescOnce.Do(func() {
+		file_agent_agentsocket_proto_agentsocket_proto_rawDescData = protoimpl.X.CompressGZIP(file_agent_agentsocket_proto_agentsocket_proto_rawDescData)
+	})
+	return file_agent_agentsocket_proto_agentsocket_proto_rawDescData
+}
+
+var file_agent_agentsocket_proto_agentsocket_proto_msgTypes = make([]protoimpl.MessageInfo, 13)
+var file_agent_agentsocket_proto_agentsocket_proto_goTypes = []interface{}{
+	(*PingRequest)(nil),          // 0: coder.agentsocket.v1.PingRequest
+	(*PingResponse)(nil),         // 1: coder.agentsocket.v1.PingResponse
+	(*SyncStartRequest)(nil),     // 2: coder.agentsocket.v1.SyncStartRequest
+	(*SyncStartResponse)(nil),    // 3: coder.agentsocket.v1.SyncStartResponse
+	(*SyncWantRequest)(nil),      // 4: coder.agentsocket.v1.SyncWantRequest
+	(*SyncWantResponse)(nil),     // 5: coder.agentsocket.v1.SyncWantResponse
+	(*SyncCompleteRequest)(nil),  // 6: coder.agentsocket.v1.SyncCompleteRequest
+	(*SyncCompleteResponse)(nil), // 7: coder.agentsocket.v1.SyncCompleteResponse
+	(*SyncReadyRequest)(nil),     // 8: coder.agentsocket.v1.SyncReadyRequest
+	(*SyncReadyResponse)(nil),    // 9: coder.agentsocket.v1.SyncReadyResponse
+	(*SyncStatusRequest)(nil),    // 10: coder.agentsocket.v1.SyncStatusRequest
+	(*DependencyInfo)(nil),       // 11: coder.agentsocket.v1.DependencyInfo
+	(*SyncStatusResponse)(nil),   // 12: coder.agentsocket.v1.SyncStatusResponse
+}
+var file_agent_agentsocket_proto_agentsocket_proto_depIdxs = []int32{
+	11, // 0: coder.agentsocket.v1.SyncStatusResponse.dependencies:type_name -> coder.agentsocket.v1.DependencyInfo
+	0,  // 1: coder.agentsocket.v1.AgentSocket.Ping:input_type -> coder.agentsocket.v1.PingRequest
+	2,  // 2: coder.agentsocket.v1.AgentSocket.SyncStart:input_type -> coder.agentsocket.v1.SyncStartRequest
+	4,  // 3: coder.agentsocket.v1.AgentSocket.SyncWant:input_type -> coder.agentsocket.v1.SyncWantRequest
+	6,  // 4: coder.agentsocket.v1.AgentSocket.SyncComplete:input_type -> coder.agentsocket.v1.SyncCompleteRequest
+	8,  // 5: coder.agentsocket.v1.AgentSocket.SyncReady:input_type -> coder.agentsocket.v1.SyncReadyRequest
+	10, // 6: coder.agentsocket.v1.AgentSocket.SyncStatus:input_type -> coder.agentsocket.v1.SyncStatusRequest
+	1,  // 7: coder.agentsocket.v1.AgentSocket.Ping:output_type -> coder.agentsocket.v1.PingResponse
+	3,  // 8: coder.agentsocket.v1.AgentSocket.SyncStart:output_type -> coder.agentsocket.v1.SyncStartResponse
+	5,  // 9: coder.agentsocket.v1.AgentSocket.SyncWant:output_type -> coder.agentsocket.v1.SyncWantResponse
+	7,  // 10: coder.agentsocket.v1.AgentSocket.SyncComplete:output_type -> coder.agentsocket.v1.SyncCompleteResponse
+	9,  // 11: coder.agentsocket.v1.AgentSocket.SyncReady:output_type -> coder.agentsocket.v1.SyncReadyResponse
+	12, // 12: coder.agentsocket.v1.AgentSocket.SyncStatus:output_type -> coder.agentsocket.v1.SyncStatusResponse
+	7,  // [7:13] is the sub-list for method output_type
+	1,  // [1:7] is the sub-list for method input_type
+	1,  // [1:1] is the sub-list for extension type_name
+	1,  // [1:1] is the sub-list for extension extendee
+	0,  // [0:1] is the sub-list for field type_name
+}
+
+func init() { file_agent_agentsocket_proto_agentsocket_proto_init() }
+func file_agent_agentsocket_proto_agentsocket_proto_init() {
+	if File_agent_agentsocket_proto_agentsocket_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_agent_agentsocket_proto_agentsocket_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*PingRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_agent_agentsocket_proto_agentsocket_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*PingResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_agent_agentsocket_proto_agentsocket_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*SyncStartRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_agent_agentsocket_proto_agentsocket_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*SyncStartResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_agent_agentsocket_proto_agentsocket_proto_msgTypes[4].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*SyncWantRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_agent_agentsocket_proto_agentsocket_proto_msgTypes[5].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*SyncWantResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_agent_agentsocket_proto_agentsocket_proto_msgTypes[6].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*SyncCompleteRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_agent_agentsocket_proto_agentsocket_proto_msgTypes[7].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*SyncCompleteResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_agent_agentsocket_proto_agentsocket_proto_msgTypes[8].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*SyncReadyRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_agent_agentsocket_proto_agentsocket_proto_msgTypes[9].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*SyncReadyResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_agent_agentsocket_proto_agentsocket_proto_msgTypes[10].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*SyncStatusRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_agent_agentsocket_proto_agentsocket_proto_msgTypes[11].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*DependencyInfo); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_agent_agentsocket_proto_agentsocket_proto_msgTypes[12].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*SyncStatusResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_agent_agentsocket_proto_agentsocket_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   13,
+			NumExtensions: 0,
+			NumServices:   1,
+		},
+		GoTypes:           file_agent_agentsocket_proto_agentsocket_proto_goTypes,
+		DependencyIndexes: file_agent_agentsocket_proto_agentsocket_proto_depIdxs,
+		MessageInfos:      file_agent_agentsocket_proto_agentsocket_proto_msgTypes,
+	}.Build()
+	File_agent_agentsocket_proto_agentsocket_proto = out.File
+	file_agent_agentsocket_proto_agentsocket_proto_rawDesc = nil
+	file_agent_agentsocket_proto_agentsocket_proto_goTypes = nil
+	file_agent_agentsocket_proto_agentsocket_proto_depIdxs = nil
+}

agent/agentsocket/proto/agentsocket.proto

@@ -0,0 +1,69 @@
+syntax = "proto3";
+option go_package = "github.com/coder/coder/v2/agent/agentsocket/proto";
+
+package coder.agentsocket.v1;
+
+message PingRequest {}
+
+message PingResponse {}
+
+message SyncStartRequest {
+  string unit = 1;
+}
+
+message SyncStartResponse {}
+
+message SyncWantRequest {
+  string unit = 1;
+  string depends_on = 2;
+}
+
+message SyncWantResponse {}
+
+message SyncCompleteRequest {
+  string unit = 1;
+}
+
+message SyncCompleteResponse {}
+
+message SyncReadyRequest {
+  string unit = 1;
+}
+
+message SyncReadyResponse {
+  bool ready = 1;
+}
+
+message SyncStatusRequest {
+  string unit = 1;
+}
+
+message DependencyInfo {
+  string unit = 1;
+  string depends_on = 2;
+  string required_status = 3;
+  string current_status = 4;
+  bool is_satisfied = 5;
+}
+
+message SyncStatusResponse {
+  string status = 1;
+  bool is_ready = 2;
+  repeated DependencyInfo dependencies = 3;
+}
+
+// AgentSocket provides direct access to the agent over local IPC.
+service AgentSocket {
+  // Ping the agent to check if it is alive.
+  rpc Ping(PingRequest) returns (PingResponse);
+  // Report the start of a unit.
+  rpc SyncStart(SyncStartRequest) returns (SyncStartResponse);
+  // Declare a dependency between units.
+  rpc SyncWant(SyncWantRequest) returns (SyncWantResponse);
+  // Report the completion of a unit.
+  rpc SyncComplete(SyncCompleteRequest) returns (SyncCompleteResponse);
+  // Request whether a unit is ready to be started. That is, all dependencies are satisfied.
+  rpc SyncReady(SyncReadyRequest) returns (SyncReadyResponse);
+  // Get the status of a unit and list its dependencies.
+  rpc SyncStatus(SyncStatusRequest) returns (SyncStatusResponse);
+}

agent/agentsocket/proto/agentsocket_drpc.pb.go

@@ -0,0 +1,311 @@
+// Code generated by protoc-gen-go-drpc. DO NOT EDIT.
+// protoc-gen-go-drpc version: v0.0.34
+// source: agent/agentsocket/proto/agentsocket.proto
+
+package proto
+
+import (
+	context "context"
+	errors "errors"
+	protojson "google.golang.org/protobuf/encoding/protojson"
+	proto "google.golang.org/protobuf/proto"
+	drpc "storj.io/drpc"
+	drpcerr "storj.io/drpc/drpcerr"
+)
+
+type drpcEncoding_File_agent_agentsocket_proto_agentsocket_proto struct{}
+
+func (drpcEncoding_File_agent_agentsocket_proto_agentsocket_proto) Marshal(msg drpc.Message) ([]byte, error) {
+	return proto.Marshal(msg.(proto.Message))
+}
+
+func (drpcEncoding_File_agent_agentsocket_proto_agentsocket_proto) MarshalAppend(buf []byte, msg drpc.Message) ([]byte, error) {
+	return proto.MarshalOptions{}.MarshalAppend(buf, msg.(proto.Message))
+}
+
+func (drpcEncoding_File_agent_agentsocket_proto_agentsocket_proto) Unmarshal(buf []byte, msg drpc.Message) error {
+	return proto.Unmarshal(buf, msg.(proto.Message))
+}
+
+func (drpcEncoding_File_agent_agentsocket_proto_agentsocket_proto) JSONMarshal(msg drpc.Message) ([]byte, error) {
+	return protojson.Marshal(msg.(proto.Message))
+}
+
+func (drpcEncoding_File_agent_agentsocket_proto_agentsocket_proto) JSONUnmarshal(buf []byte, msg drpc.Message) error {
+	return protojson.Unmarshal(buf, msg.(proto.Message))
+}
+
+type DRPCAgentSocketClient interface {
+	DRPCConn() drpc.Conn
+
+	Ping(ctx context.Context, in *PingRequest) (*PingResponse, error)
+	SyncStart(ctx context.Context, in *SyncStartRequest) (*SyncStartResponse, error)
+	SyncWant(ctx context.Context, in *SyncWantRequest) (*SyncWantResponse, error)
+	SyncComplete(ctx context.Context, in *SyncCompleteRequest) (*SyncCompleteResponse, error)
+	SyncReady(ctx context.Context, in *SyncReadyRequest) (*SyncReadyResponse, error)
+	SyncStatus(ctx context.Context, in *SyncStatusRequest) (*SyncStatusResponse, error)
+}
+
+type drpcAgentSocketClient struct {
+	cc drpc.Conn
+}
+
+func NewDRPCAgentSocketClient(cc drpc.Conn) DRPCAgentSocketClient {
+	return &drpcAgentSocketClient{cc}
+}
+
+func (c *drpcAgentSocketClient) DRPCConn() drpc.Conn { return c.cc }
+
+func (c *drpcAgentSocketClient) Ping(ctx context.Context, in *PingRequest) (*PingResponse, error) {
+	out := new(PingResponse)
+	err := c.cc.Invoke(ctx, "/coder.agentsocket.v1.AgentSocket/Ping", drpcEncoding_File_agent_agentsocket_proto_agentsocket_proto{}, in, out)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *drpcAgentSocketClient) SyncStart(ctx context.Context, in *SyncStartRequest) (*SyncStartResponse, error) {
+	out := new(SyncStartResponse)
+	err := c.cc.Invoke(ctx, "/coder.agentsocket.v1.AgentSocket/SyncStart", drpcEncoding_File_agent_agentsocket_proto_agentsocket_proto{}, in, out)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *drpcAgentSocketClient) SyncWant(ctx context.Context, in *SyncWantRequest) (*SyncWantResponse, error) {
+	out := new(SyncWantResponse)
+	err := c.cc.Invoke(ctx, "/coder.agentsocket.v1.AgentSocket/SyncWant", drpcEncoding_File_agent_agentsocket_proto_agentsocket_proto{}, in, out)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *drpcAgentSocketClient) SyncComplete(ctx context.Context, in *SyncCompleteRequest) (*SyncCompleteResponse, error) {
+	out := new(SyncCompleteResponse)
+	err := c.cc.Invoke(ctx, "/coder.agentsocket.v1.AgentSocket/SyncComplete", drpcEncoding_File_agent_agentsocket_proto_agentsocket_proto{}, in, out)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *drpcAgentSocketClient) SyncReady(ctx context.Context, in *SyncReadyRequest) (*SyncReadyResponse, error) {
+	out := new(SyncReadyResponse)
+	err := c.cc.Invoke(ctx, "/coder.agentsocket.v1.AgentSocket/SyncReady", drpcEncoding_File_agent_agentsocket_proto_agentsocket_proto{}, in, out)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *drpcAgentSocketClient) SyncStatus(ctx context.Context, in *SyncStatusRequest) (*SyncStatusResponse, error) {
+	out := new(SyncStatusResponse)
+	err := c.cc.Invoke(ctx, "/coder.agentsocket.v1.AgentSocket/SyncStatus", drpcEncoding_File_agent_agentsocket_proto_agentsocket_proto{}, in, out)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+type DRPCAgentSocketServer interface {
+	Ping(context.Context, *PingRequest) (*PingResponse, error)
+	SyncStart(context.Context, *SyncStartRequest) (*SyncStartResponse, error)
+	SyncWant(context.Context, *SyncWantRequest) (*SyncWantResponse, error)
+	SyncComplete(context.Context, *SyncCompleteRequest) (*SyncCompleteResponse, error)
+	SyncReady(context.Context, *SyncReadyRequest) (*SyncReadyResponse, error)
+	SyncStatus(context.Context, *SyncStatusRequest) (*SyncStatusResponse, error)
+}
+
+type DRPCAgentSocketUnimplementedServer struct{}
+
+func (s *DRPCAgentSocketUnimplementedServer) Ping(context.Context, *PingRequest) (*PingResponse, error) {
+	return nil, drpcerr.WithCode(errors.New("Unimplemented"), drpcerr.Unimplemented)
+}
+
+func (s *DRPCAgentSocketUnimplementedServer) SyncStart(context.Context, *SyncStartRequest) (*SyncStartResponse, error) {
+	return nil, drpcerr.WithCode(errors.New("Unimplemented"), drpcerr.Unimplemented)
+}
+
+func (s *DRPCAgentSocketUnimplementedServer) SyncWant(context.Context, *SyncWantRequest) (*SyncWantResponse, error) {
+	return nil, drpcerr.WithCode(errors.New("Unimplemented"), drpcerr.Unimplemented)
+}
+
+func (s *DRPCAgentSocketUnimplementedServer) SyncComplete(context.Context, *SyncCompleteRequest) (*SyncCompleteResponse, error) {
+	return nil, drpcerr.WithCode(errors.New("Unimplemented"), drpcerr.Unimplemented)
+}
+
+func (s *DRPCAgentSocketUnimplementedServer) SyncReady(context.Context, *SyncReadyRequest) (*SyncReadyResponse, error) {
+	return nil, drpcerr.WithCode(errors.New("Unimplemented"), drpcerr.Unimplemented)
+}
+
+func (s *DRPCAgentSocketUnimplementedServer) SyncStatus(context.Context, *SyncStatusRequest) (*SyncStatusResponse, error) {
+	return nil, drpcerr.WithCode(errors.New("Unimplemented"), drpcerr.Unimplemented)
+}
+
+type DRPCAgentSocketDescription struct{}
+
+func (DRPCAgentSocketDescription) NumMethods() int { return 6 }
+
+func (DRPCAgentSocketDescription) Method(n int) (string, drpc.Encoding, drpc.Receiver, interface{}, bool) {
+	switch n {
+	case 0:
+		return "/coder.agentsocket.v1.AgentSocket/Ping", drpcEncoding_File_agent_agentsocket_proto_agentsocket_proto{},
+			func(srv interface{}, ctx context.Context, in1, in2 interface{}) (drpc.Message, error) {
+				return srv.(DRPCAgentSocketServer).
+					Ping(
+						ctx,
+						in1.(*PingRequest),
+					)
+			}, DRPCAgentSocketServer.Ping, true
+	case 1:
+		return "/coder.agentsocket.v1.AgentSocket/SyncStart", drpcEncoding_File_agent_agentsocket_proto_agentsocket_proto{},
+			func(srv interface{}, ctx context.Context, in1, in2 interface{}) (drpc.Message, error) {
+				return srv.(DRPCAgentSocketServer).
+					SyncStart(
+						ctx,
+						in1.(*SyncStartRequest),
+					)
+			}, DRPCAgentSocketServer.SyncStart, true
+	case 2:
+		return "/coder.agentsocket.v1.AgentSocket/SyncWant", drpcEncoding_File_agent_agentsocket_proto_agentsocket_proto{},
+			func(srv interface{}, ctx context.Context, in1, in2 interface{}) (drpc.Message, error) {
+				return srv.(DRPCAgentSocketServer).
+					SyncWant(
+						ctx,
+						in1.(*SyncWantRequest),
+					)
+			}, DRPCAgentSocketServer.SyncWant, true
+	case 3:
+		return "/coder.agentsocket.v1.AgentSocket/SyncComplete", drpcEncoding_File_agent_agentsocket_proto_agentsocket_proto{},
+			func(srv interface{}, ctx context.Context, in1, in2 interface{}) (drpc.Message, error) {
+				return srv.(DRPCAgentSocketServer).
+					SyncComplete(
+						ctx,
+						in1.(*SyncCompleteRequest),
+					)
+			}, DRPCAgentSocketServer.SyncComplete, true
+	case 4:
+		return "/coder.agentsocket.v1.AgentSocket/SyncReady", drpcEncoding_File_agent_agentsocket_proto_agentsocket_proto{},
+			func(srv interface{}, ctx context.Context, in1, in2 interface{}) (drpc.Message, error) {
+				return srv.(DRPCAgentSocketServer).
+					SyncReady(
+						ctx,
+						in1.(*SyncReadyRequest),
+					)
+			}, DRPCAgentSocketServer.SyncReady, true
+	case 5:
+		return "/coder.agentsocket.v1.AgentSocket/SyncStatus", drpcEncoding_File_agent_agentsocket_proto_agentsocket_proto{},
+			func(srv interface{}, ctx context.Context, in1, in2 interface{}) (drpc.Message, error) {
+				return srv.(DRPCAgentSocketServer).
+					SyncStatus(
+						ctx,
+						in1.(*SyncStatusRequest),
+					)
+			}, DRPCAgentSocketServer.SyncStatus, true
+	default:
+		return "", nil, nil, nil, false
+	}
+}
+
+func DRPCRegisterAgentSocket(mux drpc.Mux, impl DRPCAgentSocketServer) error {
+	return mux.Register(impl, DRPCAgentSocketDescription{})
+}
+
+type DRPCAgentSocket_PingStream interface {
+	drpc.Stream
+	SendAndClose(*PingResponse) error
+}
+
+type drpcAgentSocket_PingStream struct {
+	drpc.Stream
+}
+
+func (x *drpcAgentSocket_PingStream) SendAndClose(m *PingResponse) error {
+	if err := x.MsgSend(m, drpcEncoding_File_agent_agentsocket_proto_agentsocket_proto{}); err != nil {
+		return err
+	}
+	return x.CloseSend()
+}
+
+type DRPCAgentSocket_SyncStartStream interface {
+	drpc.Stream
+	SendAndClose(*SyncStartResponse) error
+}
+
+type drpcAgentSocket_SyncStartStream struct {
+	drpc.Stream
+}
+
+func (x *drpcAgentSocket_SyncStartStream) SendAndClose(m *SyncStartResponse) error {
+	if err := x.MsgSend(m, drpcEncoding_File_agent_agentsocket_proto_agentsocket_proto{}); err != nil {
+		return err
+	}
+	return x.CloseSend()
+}
+
+type DRPCAgentSocket_SyncWantStream interface {
+	drpc.Stream
+	SendAndClose(*SyncWantResponse) error
+}
+
+type drpcAgentSocket_SyncWantStream struct {
+	drpc.Stream
+}
+
+func (x *drpcAgentSocket_SyncWantStream) SendAndClose(m *SyncWantResponse) error {
+	if err := x.MsgSend(m, drpcEncoding_File_agent_agentsocket_proto_agentsocket_proto{}); err != nil {
+		return err
+	}
+	return x.CloseSend()
+}
+
+type DRPCAgentSocket_SyncCompleteStream interface {
+	drpc.Stream
+	SendAndClose(*SyncCompleteResponse) error
+}
+
+type drpcAgentSocket_SyncCompleteStream struct {
+	drpc.Stream
+}
+
+func (x *drpcAgentSocket_SyncCompleteStream) SendAndClose(m *SyncCompleteResponse) error {
+	if err := x.MsgSend(m, drpcEncoding_File_agent_agentsocket_proto_agentsocket_proto{}); err != nil {
+		return err
+	}
+	return x.CloseSend()
+}
+
+type DRPCAgentSocket_SyncReadyStream interface {
+	drpc.Stream
+	SendAndClose(*SyncReadyResponse) error
+}
+
+type drpcAgentSocket_SyncReadyStream struct {
+	drpc.Stream
+}
+
+func (x *drpcAgentSocket_SyncReadyStream) SendAndClose(m *SyncReadyResponse) error {
+	if err := x.MsgSend(m, drpcEncoding_File_agent_agentsocket_proto_agentsocket_proto{}); err != nil {
+		return err
+	}
+	return x.CloseSend()
+}
+
+type DRPCAgentSocket_SyncStatusStream interface {
+	drpc.Stream
+	SendAndClose(*SyncStatusResponse) error
+}
+
+type drpcAgentSocket_SyncStatusStream struct {
+	drpc.Stream
+}
+
+func (x *drpcAgentSocket_SyncStatusStream) SendAndClose(m *SyncStatusResponse) error {
+	if err := x.MsgSend(m, drpcEncoding_File_agent_agentsocket_proto_agentsocket_proto{}); err != nil {
+		return err
+	}
+	return x.CloseSend()
+}

agent/agentsocket/proto/version.go

@@ -0,0 +1,17 @@
+package proto
+
+import "github.com/coder/coder/v2/apiversion"
+
+// Version history:
+//
+// API v1.0:
+//   - Initial release
+//   - Ping
+//   - Sync operations: SyncStart, SyncWant, SyncComplete, SyncWait, SyncStatus
+
+const (
+	CurrentMajor = 1
+	CurrentMinor = 0
+)
+
+var CurrentVersion = apiversion.New(CurrentMajor, CurrentMinor)

agent/agentsocket/server.go

@@ -0,0 +1,185 @@
+package agentsocket
+
+import (
+	"context"
+	"errors"
+	"net"
+	"sync"
+
+	"golang.org/x/xerrors"
+
+	"github.com/hashicorp/yamux"
+	"storj.io/drpc/drpcmux"
+	"storj.io/drpc/drpcserver"
+
+	"cdr.dev/slog"
+	"github.com/coder/coder/v2/agent/agentsocket/proto"
+	"github.com/coder/coder/v2/agent/unit"
+	"github.com/coder/coder/v2/codersdk/drpcsdk"
+)
+
+// Server provides access to the DRPCAgentSocketService via a Unix domain socket.
+// Do not invoke Server{} directly. Use NewServer() instead.
+type Server struct {
+	logger     slog.Logger
+	path       string
+	drpcServer *drpcserver.Server
+	service    *DRPCAgentSocketService
+
+	mu       sync.Mutex
+	listener net.Listener
+	ctx      context.Context
+	cancel   context.CancelFunc
+	wg       sync.WaitGroup
+}
+
+func NewServer(path string, logger slog.Logger) (*Server, error) {
+	logger = logger.Named("agentsocket-server")
+	server := &Server{
+		logger: logger,
+		path:   path,
+		service: &DRPCAgentSocketService{
+			logger:      logger,
+			unitManager: unit.NewManager(),
+		},
+	}
+
+	mux := drpcmux.New()
+	err := proto.DRPCRegisterAgentSocket(mux, server.service)
+	if err != nil {
+		return nil, xerrors.Errorf("failed to register drpc service: %w", err)
+	}
+
+	server.drpcServer = drpcserver.NewWithOptions(mux, drpcserver.Options{
+		Manager: drpcsdk.DefaultDRPCOptions(nil),
+		Log: func(err error) {
+			if errors.Is(err, context.Canceled) ||
+				errors.Is(err, context.DeadlineExceeded) {
+				return
+			}
+			logger.Debug(context.Background(), "drpc server error", slog.Error(err))
+		},
+	})
+
+	if server.path == "" {
+		var err error
+		server.path, err = getDefaultSocketPath()
+		if err != nil {
+			return nil, xerrors.Errorf("get default socket path: %w", err)
+		}
+	}
+
+	listener, err := createSocket(server.path)
+	if err != nil {
+		return nil, xerrors.Errorf("create socket: %w", err)
+	}
+
+	server.listener = listener
+
+	// This context is canceled by server.Close().
+	// canceling it will close all connections.
+	server.ctx, server.cancel = context.WithCancel(context.Background())
+
+	server.logger.Info(server.ctx, "agent socket server started", slog.F("path", server.path))
+
+	server.wg.Add(1)
+	go func() {
+		defer server.wg.Done()
+		server.acceptConnections()
+	}()
+
+	return server, nil
+}
+
+func (s *Server) Close() error {
+	s.mu.Lock()
+
+	if s.listener == nil {
+		s.mu.Unlock()
+		return nil
+	}
+
+	s.logger.Info(s.ctx, "stopping agent socket server")
+
+	s.cancel()
+
+	if err := s.listener.Close(); err != nil {
+		s.logger.Warn(s.ctx, "error closing socket listener", slog.Error(err))
+	}
+
+	s.listener = nil
+
+	s.mu.Unlock()
+
+	// Wait for all connections to finish
+	s.wg.Wait()
+
+	if err := cleanupSocket(s.path); err != nil {
+		s.logger.Warn(s.ctx, "error cleaning up socket file", slog.Error(err))
+	}
+
+	s.logger.Info(s.ctx, "agent socket server stopped")
+
+	return nil
+}
+
+func (s *Server) acceptConnections() {
+	// In an edge case, Close() might race with acceptConnections() and set s.listener to nil.
+	// Therefore, we grab a copy of the listener under a lock. We might still get a nil listener,
+	// but then we know close has already run and we can return early.
+	s.mu.Lock()
+	listener := s.listener
+	s.mu.Unlock()
+	if listener == nil {
+		return
+	}
+
+	for {
+		select {
+		case <-s.ctx.Done():
+			return
+		default:
+		}
+
+		conn, err := listener.Accept()
+		if err != nil {
+			s.logger.Warn(s.ctx, "error accepting connection", slog.Error(err))
+			continue
+		}
+
+		s.mu.Lock()
+		if s.listener == nil {
+			s.mu.Unlock()
+			_ = conn.Close()
+			return
+		}
+		s.wg.Add(1)
+		s.mu.Unlock()
+
+		go func() {
+			defer s.wg.Done()
+			s.handleConnection(conn)
+		}()
+	}
+}
+
+func (s *Server) handleConnection(conn net.Conn) {
+	defer conn.Close()
+
+	s.logger.Debug(s.ctx, "new connection accepted", slog.F("remote_addr", conn.RemoteAddr()))
+
+	config := yamux.DefaultConfig()
+	config.LogOutput = nil
+	config.Logger = slog.Stdlib(s.ctx, s.logger.Named("agentsocket-yamux"), slog.LevelInfo)
+	session, err := yamux.Server(conn, config)
+	if err != nil {
+		s.logger.Warn(s.ctx, "failed to create yamux session", slog.Error(err))
+		return
+	}
+	defer session.Close()
+
+	err = s.drpcServer.Serve(s.ctx, session)
+	if err != nil {
+		s.logger.Debug(s.ctx, "drpc server finished", slog.Error(err))
+	}
+}

agent/agentsocket/server_test.go

@@ -0,0 +1,52 @@
+package agentsocket_test
+
+import (
+	"path/filepath"
+	"runtime"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"cdr.dev/slog"
+	"github.com/coder/coder/v2/agent/agentsocket"
+)
+
+func TestServer(t *testing.T) {
+	t.Parallel()
+
+	if runtime.GOOS == "windows" {
+		t.Skip("agentsocket is not supported on Windows")
+	}
+
+	t.Run("StartStop", func(t *testing.T) {
+		t.Parallel()
+
+		socketPath := filepath.Join(t.TempDir(), "test.sock")
+		logger := slog.Make().Leveled(slog.LevelDebug)
+		server, err := agentsocket.NewServer(socketPath, logger)
+		require.NoError(t, err)
+		require.NoError(t, server.Close())
+	})
+
+	t.Run("AlreadyStarted", func(t *testing.T) {
+		t.Parallel()
+
+		socketPath := filepath.Join(t.TempDir(), "test.sock")
+		logger := slog.Make().Leveled(slog.LevelDebug)
+		server1, err := agentsocket.NewServer(socketPath, logger)
+		require.NoError(t, err)
+		defer server1.Close()
+		_, err = agentsocket.NewServer(socketPath, logger)
+		require.ErrorContains(t, err, "create socket")
+	})
+
+	t.Run("AutoSocketPath", func(t *testing.T) {
+		t.Parallel()
+
+		socketPath := filepath.Join(t.TempDir(), "test.sock")
+		logger := slog.Make().Leveled(slog.LevelDebug)
+		server, err := agentsocket.NewServer(socketPath, logger)
+		require.NoError(t, err)
+		require.NoError(t, server.Close())
+	})
+}

agent/agentsocket/service.go

@@ -0,0 +1,142 @@
+package agentsocket
+
+import (
+	"context"
+	"errors"
+
+	"golang.org/x/xerrors"
+
+	"cdr.dev/slog"
+	"github.com/coder/coder/v2/agent/agentsocket/proto"
+	"github.com/coder/coder/v2/agent/unit"
+)
+
+var _ proto.DRPCAgentSocketServer = (*DRPCAgentSocketService)(nil)
+
+var ErrUnitManagerNotAvailable = xerrors.New("unit manager not available")
+
+type DRPCAgentSocketService struct {
+	unitManager *unit.Manager
+	logger      slog.Logger
+}
+
+func (*DRPCAgentSocketService) Ping(_ context.Context, _ *proto.PingRequest) (*proto.PingResponse, error) {
+	return &proto.PingResponse{}, nil
+}
+
+func (s *DRPCAgentSocketService) SyncStart(_ context.Context, req *proto.SyncStartRequest) (*proto.SyncStartResponse, error) {
+	if s.unitManager == nil {
+		return nil, xerrors.Errorf("SyncStart: %w", ErrUnitManagerNotAvailable)
+	}
+
+	unitID := unit.ID(req.Unit)
+
+	if err := s.unitManager.Register(unitID); err != nil {
+		if !errors.Is(err, unit.ErrUnitAlreadyRegistered) {
+			return nil, xerrors.Errorf("SyncStart: %w", err)
+		}
+	}
+
+	isReady, err := s.unitManager.IsReady(unitID)
+	if err != nil {
+		return nil, xerrors.Errorf("cannot check readiness: %w", err)
+	}
+	if !isReady {
+		return nil, xerrors.Errorf("cannot start unit %q: unit not ready", req.Unit)
+	}
+
+	err = s.unitManager.UpdateStatus(unitID, unit.StatusStarted)
+	if err != nil {
+		return nil, xerrors.Errorf("cannot start unit %q: %w", req.Unit, err)
+	}
+
+	return &proto.SyncStartResponse{}, nil
+}
+
+func (s *DRPCAgentSocketService) SyncWant(_ context.Context, req *proto.SyncWantRequest) (*proto.SyncWantResponse, error) {
+	if s.unitManager == nil {
+		return nil, xerrors.Errorf("cannot add dependency: %w", ErrUnitManagerNotAvailable)
+	}
+
+	unitID := unit.ID(req.Unit)
+	dependsOnID := unit.ID(req.DependsOn)
+
+	if err := s.unitManager.Register(unitID); err != nil && !errors.Is(err, unit.ErrUnitAlreadyRegistered) {
+		return nil, xerrors.Errorf("cannot add dependency: %w", err)
+	}
+
+	if err := s.unitManager.AddDependency(unitID, dependsOnID, unit.StatusComplete); err != nil {
+		return nil, xerrors.Errorf("cannot add dependency: %w", err)
+	}
+
+	return &proto.SyncWantResponse{}, nil
+}
+
+func (s *DRPCAgentSocketService) SyncComplete(_ context.Context, req *proto.SyncCompleteRequest) (*proto.SyncCompleteResponse, error) {
+	if s.unitManager == nil {
+		return nil, xerrors.Errorf("cannot complete unit: %w", ErrUnitManagerNotAvailable)
+	}
+
+	unitID := unit.ID(req.Unit)
+
+	if err := s.unitManager.UpdateStatus(unitID, unit.StatusComplete); err != nil {
+		return nil, xerrors.Errorf("cannot complete unit %q: %w", req.Unit, err)
+	}
+
+	return &proto.SyncCompleteResponse{}, nil
+}
+
+func (s *DRPCAgentSocketService) SyncReady(_ context.Context, req *proto.SyncReadyRequest) (*proto.SyncReadyResponse, error) {
+	if s.unitManager == nil {
+		return nil, xerrors.Errorf("cannot check readiness: %w", ErrUnitManagerNotAvailable)
+	}
+
+	unitID := unit.ID(req.Unit)
+	isReady, err := s.unitManager.IsReady(unitID)
+	if err != nil {
+		return nil, xerrors.Errorf("cannot check readiness: %w", err)
+	}
+
+	return &proto.SyncReadyResponse{
+		Ready: isReady,
+	}, nil
+}
+
+func (s *DRPCAgentSocketService) SyncStatus(_ context.Context, req *proto.SyncStatusRequest) (*proto.SyncStatusResponse, error) {
+	if s.unitManager == nil {
+		return nil, xerrors.Errorf("cannot get status for unit %q: %w", req.Unit, ErrUnitManagerNotAvailable)
+	}
+
+	unitID := unit.ID(req.Unit)
+
+	isReady, err := s.unitManager.IsReady(unitID)
+	if err != nil {
+		return nil, xerrors.Errorf("cannot check readiness: %w", err)
+	}
+
+	dependencies, err := s.unitManager.GetAllDependencies(unitID)
+	if err != nil {
+		return nil, xerrors.Errorf("failed to get dependencies: %w", err)
+	}
+
+	var depInfos []*proto.DependencyInfo
+	for _, dep := range dependencies {
+		depInfos = append(depInfos, &proto.DependencyInfo{
+			Unit:           string(dep.Unit),
+			DependsOn:      string(dep.DependsOn),
+			RequiredStatus: string(dep.RequiredStatus),
+			CurrentStatus:  string(dep.CurrentStatus),
+			IsSatisfied:    dep.IsSatisfied,
+		})
+	}
+
+	u, err := s.unitManager.Unit(unitID)
+	if err != nil {
+		return nil, xerrors.Errorf("cannot get status for unit %q: %w", req.Unit, err)
+	}
+	return &proto.SyncStatusResponse{
+		Status:       string(u.Status()),
+		IsReady:      isReady,
+		Dependencies: depInfos,
+	}, nil
+}

agent/agentsocket/service_test.go

@@ -0,0 +1,470 @@
+package agentsocket_test
+
+import (
+	"context"
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+	"net"
+	"os"
+	"path/filepath"
+	"runtime"
+	"testing"
+
+	"github.com/hashicorp/yamux"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"cdr.dev/slog"
+	"github.com/coder/coder/v2/agent/agentsocket"
+	"github.com/coder/coder/v2/agent/agentsocket/proto"
+	"github.com/coder/coder/v2/agent/unit"
+	"github.com/coder/coder/v2/codersdk/drpcsdk"
+)
+
+// tempDirUnixSocket returns a temporary directory that can safely hold unix
+// sockets (probably).
+//
+// During tests on darwin we hit the max path length limit for unix sockets
+// pretty easily in the default location, so this function uses /tmp instead to
+// get shorter paths. To keep paths short, we use a hash of the test name
+// instead of the full test name.
+func tempDirUnixSocket(t *testing.T) string {
+	t.Helper()
+	if runtime.GOOS == "darwin" {
+		// Use a short hash of the test name to keep the path under 104 chars
+		hash := sha256.Sum256([]byte(t.Name()))
+		hashStr := hex.EncodeToString(hash[:])[:8] // Use first 8 chars of hash
+		dir, err := os.MkdirTemp("/tmp", fmt.Sprintf("c-%s-", hashStr))
+		require.NoError(t, err, "create temp dir for unix socket test")
+		t.Cleanup(func() {
+			err := os.RemoveAll(dir)
+			assert.NoError(t, err, "remove temp dir", dir)
+		})
+		return dir
+	}
+	return t.TempDir()
+}
+
+// newSocketClient creates a DRPC client connected to the Unix socket at the given path.
+func newSocketClient(t *testing.T, socketPath string) proto.DRPCAgentSocketClient {
+	t.Helper()
+
+	conn, err := net.Dial("unix", socketPath)
+	require.NoError(t, err)
+
+	config := yamux.DefaultConfig()
+	config.Logger = nil
+	session, err := yamux.Client(conn, config)
+	require.NoError(t, err)
+
+	client := proto.NewDRPCAgentSocketClient(drpcsdk.MultiplexedConn(session))
+
+	t.Cleanup(func() {
+		_ = session.Close()
+		_ = conn.Close()
+	})
+	return client
+}
+
+func TestDRPCAgentSocketService(t *testing.T) {
+	t.Parallel()
+
+	if runtime.GOOS == "windows" {
+		t.Skip("agentsocket is not supported on Windows")
+	}
+
+	t.Run("Ping", func(t *testing.T) {
+		t.Parallel()
+
+		socketPath := filepath.Join(tempDirUnixSocket(t), "test.sock")
+
+		server, err := agentsocket.NewServer(
+			socketPath,
+			slog.Make().Leveled(slog.LevelDebug),
+		)
+		require.NoError(t, err)
+		defer server.Close()
+
+		client := newSocketClient(t, socketPath)
+
+		_, err = client.Ping(context.Background(), &proto.PingRequest{})
+		require.NoError(t, err)
+	})
+
+	t.Run("SyncStart", func(t *testing.T) {
+		t.Parallel()
+
+		t.Run("NewUnit", func(t *testing.T) {
+			t.Parallel()
+			socketPath := filepath.Join(tempDirUnixSocket(t), "test.sock")
+
+			server, err := agentsocket.NewServer(
+				socketPath,
+				slog.Make().Leveled(slog.LevelDebug),
+			)
+			require.NoError(t, err)
+			defer server.Close()
+
+			client := newSocketClient(t, socketPath)
+
+			_, err = client.SyncStart(context.Background(), &proto.SyncStartRequest{
+				Unit: "test-unit",
+			})
+			require.NoError(t, err)
+
+			status, err := client.SyncStatus(context.Background(), &proto.SyncStatusRequest{
+				Unit: "test-unit",
+			})
+			require.NoError(t, err)
+			require.Equal(t, "started", status.Status)
+		})
+
+		t.Run("UnitAlreadyStarted", func(t *testing.T) {
+			t.Parallel()
+
+			socketPath := filepath.Join(tempDirUnixSocket(t), "test.sock")
+
+			server, err := agentsocket.NewServer(
+				socketPath,
+				slog.Make().Leveled(slog.LevelDebug),
+			)
+			require.NoError(t, err)
+			defer server.Close()
+
+			client := newSocketClient(t, socketPath)
+
+			// First Start
+			_, err = client.SyncStart(context.Background(), &proto.SyncStartRequest{
+				Unit: "test-unit",
+			})
+			require.NoError(t, err)
+			status, err := client.SyncStatus(context.Background(), &proto.SyncStatusRequest{
+				Unit: "test-unit",
+			})
+			require.NoError(t, err)
+			require.Equal(t, "started", status.Status)
+
+			// Second Start
+			_, err = client.SyncStart(context.Background(), &proto.SyncStartRequest{
+				Unit: "test-unit",
+			})
+			require.ErrorContains(t, err, unit.ErrSameStatusAlreadySet.Error())
+
+			status, err = client.SyncStatus(context.Background(), &proto.SyncStatusRequest{
+				Unit: "test-unit",
+			})
+			require.NoError(t, err)
+			require.Equal(t, "started", status.Status)
+		})
+
+		t.Run("UnitAlreadyCompleted", func(t *testing.T) {
+			t.Parallel()
+
+			socketPath := filepath.Join(tempDirUnixSocket(t), "test.sock")
+
+			server, err := agentsocket.NewServer(
+				socketPath,
+				slog.Make().Leveled(slog.LevelDebug),
+			)
+			require.NoError(t, err)
+			defer server.Close()
+
+			client := newSocketClient(t, socketPath)
+
+			// First start
+			_, err = client.SyncStart(context.Background(), &proto.SyncStartRequest{
+				Unit: "test-unit",
+			})
+			require.NoError(t, err)
+
+			status, err := client.SyncStatus(context.Background(), &proto.SyncStatusRequest{
+				Unit: "test-unit",
+			})
+			require.NoError(t, err)
+			require.Equal(t, "started", status.Status)
+
+			// Complete the unit
+			_, err = client.SyncComplete(context.Background(), &proto.SyncCompleteRequest{
+				Unit: "test-unit",
+			})
+			require.NoError(t, err)
+
+			status, err = client.SyncStatus(context.Background(), &proto.SyncStatusRequest{
+				Unit: "test-unit",
+			})
+			require.NoError(t, err)
+			require.Equal(t, "completed", status.Status)
+
+			// Second start
+			_, err = client.SyncStart(context.Background(), &proto.SyncStartRequest{
+				Unit: "test-unit",
+			})
+			require.NoError(t, err)
+
+			status, err = client.SyncStatus(context.Background(), &proto.SyncStatusRequest{
+				Unit: "test-unit",
+			})
+			require.NoError(t, err)
+			require.Equal(t, "started", status.Status)
+		})
+
+		t.Run("UnitNotReady", func(t *testing.T) {
+			t.Parallel()
+
+			socketPath := filepath.Join(tempDirUnixSocket(t), "test.sock")
+
+			server, err := agentsocket.NewServer(
+				socketPath,
+				slog.Make().Leveled(slog.LevelDebug),
+			)
+			require.NoError(t, err)
+			defer server.Close()
+
+			client := newSocketClient(t, socketPath)
+
+			_, err = client.SyncWant(context.Background(), &proto.SyncWantRequest{
+				Unit:      "test-unit",
+				DependsOn: "dependency-unit",
+			})
+			require.NoError(t, err)
+
+			_, err = client.SyncStart(context.Background(), &proto.SyncStartRequest{
+				Unit: "test-unit",
+			})
+			require.ErrorContains(t, err, "unit not ready")
+
+			status, err := client.SyncStatus(context.Background(), &proto.SyncStatusRequest{
+				Unit: "test-unit",
+			})
+			require.NoError(t, err)
+			require.Equal(t, string(unit.StatusPending), status.Status)
+			require.False(t, status.IsReady)
+		})
+	})
+
+	t.Run("SyncWant", func(t *testing.T) {
+		t.Parallel()
+
+		t.Run("NewUnits", func(t *testing.T) {
+			t.Parallel()
+
+			socketPath := filepath.Join(tempDirUnixSocket(t), "test.sock")
+
+			server, err := agentsocket.NewServer(
+				socketPath,
+				slog.Make().Leveled(slog.LevelDebug),
+			)
+			require.NoError(t, err)
+			defer server.Close()
+
+			client := newSocketClient(t, socketPath)
+
+			// If dependency units are not registered, they are registered automatically
+			_, err = client.SyncWant(context.Background(), &proto.SyncWantRequest{
+				Unit:      "test-unit",
+				DependsOn: "dependency-unit",
+			})
+			require.NoError(t, err)
+
+			status, err := client.SyncStatus(context.Background(), &proto.SyncStatusRequest{
+				Unit: "test-unit",
+			})
+			require.NoError(t, err)
+			require.Len(t, status.Dependencies, 1)
+			require.Equal(t, "dependency-unit", status.Dependencies[0].DependsOn)
+			require.Equal(t, "completed", status.Dependencies[0].RequiredStatus)
+		})
+
+		t.Run("DependencyAlreadyRegistered", func(t *testing.T) {
+			t.Parallel()
+
+			socketPath := filepath.Join(tempDirUnixSocket(t), "test.sock")
+
+			server, err := agentsocket.NewServer(
+				socketPath,
+				slog.Make().Leveled(slog.LevelDebug),
+			)
+			require.NoError(t, err)
+			defer server.Close()
+
+			client := newSocketClient(t, socketPath)
+
+			// Start the dependency unit
+			_, err = client.SyncStart(context.Background(), &proto.SyncStartRequest{
+				Unit: "dependency-unit",
+			})
+			require.NoError(t, err)
+
+			status, err := client.SyncStatus(context.Background(), &proto.SyncStatusRequest{
+				Unit: "dependency-unit",
+			})
+			require.NoError(t, err)
+			require.Equal(t, "started", status.Status)
+
+			// Add the dependency after the dependency unit has already started
+			_, err = client.SyncWant(context.Background(), &proto.SyncWantRequest{
+				Unit:      "test-unit",
+				DependsOn: "dependency-unit",
+			})
+
+			// Dependencies can be added even if the dependency unit has already started
+			require.NoError(t, err)
+
+			// The dependency is now reflected in the test unit's status
+			status, err = client.SyncStatus(context.Background(), &proto.SyncStatusRequest{
+				Unit: "test-unit",
+			})
+			require.NoError(t, err)
+			require.Equal(t, "dependency-unit", status.Dependencies[0].DependsOn)
+			require.Equal(t, "completed", status.Dependencies[0].RequiredStatus)
+		})
+
+		t.Run("DependencyAddedAfterDependentStarted", func(t *testing.T) {
+			t.Parallel()
+
+			socketPath := filepath.Join(tempDirUnixSocket(t), "test.sock")
+
+			server, err := agentsocket.NewServer(
+				socketPath,
+				slog.Make().Leveled(slog.LevelDebug),
+			)
+			require.NoError(t, err)
+			defer server.Close()
+
+			client := newSocketClient(t, socketPath)
+
+			// Start the dependent unit
+			_, err = client.SyncStart(context.Background(), &proto.SyncStartRequest{
+				Unit: "test-unit",
+			})
+			require.NoError(t, err)
+
+			status, err := client.SyncStatus(context.Background(), &proto.SyncStatusRequest{
+				Unit: "test-unit",
+			})
+			require.NoError(t, err)
+			require.Equal(t, "started", status.Status)
+
+			// Add the dependency after the dependency unit has already started
+			_, err = client.SyncWant(context.Background(), &proto.SyncWantRequest{
+				Unit:      "test-unit",
+				DependsOn: "dependency-unit",
+			})
+
+			// Dependencies can be added even if the dependent unit has already started.
+			// The dependency applies the next time a unit is started. The current status is not updated.
+			// This is to allow flexible dependency management. It does mean that users of this API should
+			// take care to add dependencies before they start their dependent units.
+			require.NoError(t, err)
+
+			// The dependency is now reflected in the test unit's status
+			status, err = client.SyncStatus(context.Background(), &proto.SyncStatusRequest{
+				Unit: "test-unit",
+			})
+			require.NoError(t, err)
+			require.Equal(t, "dependency-unit", status.Dependencies[0].DependsOn)
+			require.Equal(t, "completed", status.Dependencies[0].RequiredStatus)
+		})
+	})
+
+	t.Run("SyncReady", func(t *testing.T) {
+		t.Parallel()
+
+		t.Run("UnregisteredUnit", func(t *testing.T) {
+			t.Parallel()
+
+			socketPath := filepath.Join(tempDirUnixSocket(t), "test.sock")
+
+			server, err := agentsocket.NewServer(
+				socketPath,
+				slog.Make().Leveled(slog.LevelDebug),
+			)
+			require.NoError(t, err)
+			defer server.Close()
+
+			client := newSocketClient(t, socketPath)
+
+			response, err := client.SyncReady(context.Background(), &proto.SyncReadyRequest{
+				Unit: "unregistered-unit",
+			})
+			require.NoError(t, err)
+			require.False(t, response.Ready)
+		})
+
+		t.Run("UnitNotReady", func(t *testing.T) {
+			t.Parallel()
+
+			socketPath := filepath.Join(tempDirUnixSocket(t), "test.sock")
+
+			server, err := agentsocket.NewServer(
+				socketPath,
+				slog.Make().Leveled(slog.LevelDebug),
+			)
+			require.NoError(t, err)
+			defer server.Close()
+
+			client := newSocketClient(t, socketPath)
+
+			// Register a unit with an unsatisfied dependency
+			_, err = client.SyncWant(context.Background(), &proto.SyncWantRequest{
+				Unit:      "test-unit",
+				DependsOn: "dependency-unit",
+			})
+			require.NoError(t, err)
+
+			// Check readiness - should be false because dependency is not satisfied
+			response, err := client.SyncReady(context.Background(), &proto.SyncReadyRequest{
+				Unit: "test-unit",
+			})
+			require.NoError(t, err)
+			require.False(t, response.Ready)
+		})
+
+		t.Run("UnitReady", func(t *testing.T) {
+			t.Parallel()
+
+			socketPath := filepath.Join(tempDirUnixSocket(t), "test.sock")
+
+			server, err := agentsocket.NewServer(
+				socketPath,
+				slog.Make().Leveled(slog.LevelDebug),
+			)
+			require.NoError(t, err)
+			defer server.Close()
+
+			client := newSocketClient(t, socketPath)
+
+			// Register a unit with no dependencies - should be ready immediately
+			_, err = client.SyncStart(context.Background(), &proto.SyncStartRequest{
+				Unit: "test-unit",
+			})
+			require.NoError(t, err)
+
+			// Check readiness - should be true
+			_, err = client.SyncReady(context.Background(), &proto.SyncReadyRequest{
+				Unit: "test-unit",
+			})
+			require.NoError(t, err)
+
+			// Also test a unit with satisfied dependencies
+			_, err = client.SyncWant(context.Background(), &proto.SyncWantRequest{
+				Unit:      "dependent-unit",
+				DependsOn: "test-unit",
+			})
+			require.NoError(t, err)
+
+			// Complete the dependency
+			_, err = client.SyncComplete(context.Background(), &proto.SyncCompleteRequest{
+				Unit: "test-unit",
+			})
+			require.NoError(t, err)
+
+			// Now dependent-unit should be ready
+			_, err = client.SyncReady(context.Background(), &proto.SyncReadyRequest{
+				Unit: "dependent-unit",
+			})
+			require.NoError(t, err)
+		})
+	})
+}

agent/agentsocket/socket_unix.go

@@ -0,0 +1,83 @@
+//go:build !windows
+
+package agentsocket
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+	"net"
+	"os"
+	"path/filepath"
+	"time"
+
+	"golang.org/x/xerrors"
+)
+
+// createSocket creates a Unix domain socket listener
+func createSocket(path string) (net.Listener, error) {
+	if !isSocketAvailable(path) {
+		return nil, xerrors.Errorf("socket path %s is not available", path)
+	}
+
+	if err := os.Remove(path); err != nil && !os.IsNotExist(err) {
+		return nil, xerrors.Errorf("remove existing socket: %w", err)
+	}
+
+	// Create parent directory if it doesn't exist
+	parentDir := filepath.Dir(path)
+	if err := os.MkdirAll(parentDir, 0o700); err != nil {
+		return nil, xerrors.Errorf("create socket directory: %w", err)
+	}
+
+	listener, err := net.Listen("unix", path)
+	if err != nil {
+		return nil, xerrors.Errorf("listen on unix socket: %w", err)
+	}
+
+	if err := os.Chmod(path, 0o600); err != nil {
+		_ = listener.Close()
+		return nil, xerrors.Errorf("set socket permissions: %w", err)
+	}
+	return listener, nil
+}
+
+// getDefaultSocketPath returns the default socket path for Unix-like systems
+func getDefaultSocketPath() (string, error) {
+	randomBytes := make([]byte, 4)
+	if _, err := rand.Read(randomBytes); err != nil {
+		return "", xerrors.Errorf("generate random socket name: %w", err)
+	}
+	randomSuffix := hex.EncodeToString(randomBytes)
+
+	// Try XDG_RUNTIME_DIR first
+	if runtimeDir := os.Getenv("XDG_RUNTIME_DIR"); runtimeDir != "" {
+		return filepath.Join(runtimeDir, "coder-agent-"+randomSuffix+".sock"), nil
+	}
+
+	return filepath.Join("/tmp", "coder-agent-"+randomSuffix+".sock"), nil
+}
+
+// CleanupSocket removes the socket file
+func cleanupSocket(path string) error {
+	return os.Remove(path)
+}
+
+// isSocketAvailable checks if a socket path is available for use
+func isSocketAvailable(path string) bool {
+	// Check if file exists
+	if _, err := os.Stat(path); os.IsNotExist(err) {
+		return true
+	}
+
+	// Try to connect to see if it's actually listening
+	dialer := net.Dialer{Timeout: 10 * time.Second}
+	conn, err := dialer.Dial("unix", path)
+	if err != nil {
+		// If we can't connect, the socket is not in use
+		// Socket is available for use
+		return true
+	}
+	_ = conn.Close()
+	// Socket is in use
+	return false
+}

agent/agentsocket/socket_windows.go

@@ -0,0 +1,27 @@
+//go:build windows
+
+package agentsocket
+
+import (
+	"net"
+
+	"golang.org/x/xerrors"
+)
+
+// createSocket returns an error indicating that agentsocket is not supported on Windows.
+// This feature is unix-only in its current experimental state.
+func createSocket(_ string) (net.Listener, error) {
+	return nil, xerrors.New("agentsocket is not supported on Windows")
+}
+
+// getDefaultSocketPath returns an error indicating that agentsocket is not supported on Windows.
+// This feature is unix-only in its current experimental state.
+func getDefaultSocketPath() (string, error) {
+	return "", xerrors.New("agentsocket is not supported on Windows")
+}
+
+// cleanupSocket is a no-op on Windows since agentsocket is not supported.
+func cleanupSocket(_ string) error {
+	// No-op since agentsocket is not supported on Windows
+	return nil
+}

agent/unit/manager.go

@@ -10,6 +10,7 @@ import (
 )
 
 var (
+	ErrUnitIDRequired           = xerrors.New("unit name is required")
 	ErrUnitNotFound             = xerrors.New("unit not found")
 	ErrUnitAlreadyRegistered    = xerrors.New("unit already registered")
 	ErrCannotUpdateOtherUnit    = xerrors.New("cannot update other unit's status")
@@ -91,6 +92,10 @@ func (m *Manager) Register(id ID) error {
 	m.mu.Lock()
 	defer m.mu.Unlock()
 
+	if id == "" {
+		return xerrors.Errorf("registering unit %q: %w", id, ErrUnitIDRequired)
+	}
+
 	if m.registered(id) {
 		return xerrors.Errorf("registering unit %q: %w", id, ErrUnitAlreadyRegistered)
 	}
@@ -112,22 +117,30 @@ func (m *Manager) registered(id ID) bool {
 // Unit fetches a unit from the manager. If the unit does not exist,
 // it returns the Unit zero-value as a placeholder unit, because
 // units may depend on other units that have not yet been created.
-func (m *Manager) Unit(id ID) Unit {
+func (m *Manager) Unit(id ID) (Unit, error) {
+	if id == "" {
+		return Unit{}, xerrors.Errorf("unit ID cannot be empty: %w", ErrUnitIDRequired)
+	}
+
 	m.mu.RLock()
 	defer m.mu.RUnlock()
 
-	return m.units[id]
+	return m.units[id], nil
+}
+
+func (m *Manager) IsReady(id ID) (bool, error) {
+	if id == "" {
+		return false, xerrors.Errorf("unit ID cannot be empty: %w", ErrUnitIDRequired)
 	}
 
-func (m *Manager) IsReady(id ID) bool {
 	m.mu.RLock()
 	defer m.mu.RUnlock()
 
 	if !m.registered(id) {
-		return false
+		return false, nil
 	}
 
-	return m.units[id].ready
+	return m.units[id].ready, nil
 }
 
 // AddDependency adds a dependency relationship between units.
@@ -136,8 +149,13 @@ func (m *Manager) AddDependency(unit ID, dependsOn ID, requiredStatus Status) er
 	m.mu.Lock()
 	defer m.mu.Unlock()
 
-	if !m.registered(unit) {
-		return xerrors.Errorf("checking registration for unit %q: %w", unit, ErrUnitNotFound)
+	switch {
+	case unit == "":
+		return xerrors.Errorf("dependent name cannot be empty: %w", ErrUnitIDRequired)
+	case dependsOn == "":
+		return xerrors.Errorf("dependency name cannot be empty: %w", ErrUnitIDRequired)
+	case !m.registered(unit):
+		return xerrors.Errorf("dependent unit %q must be registered first: %w", unit, ErrUnitNotFound)
 	}
 
 	// Add the dependency edge to the graph
@@ -158,8 +176,11 @@ func (m *Manager) UpdateStatus(unit ID, newStatus Status) error {
 	m.mu.Lock()
 	defer m.mu.Unlock()
 
-	if !m.registered(unit) {
-		return xerrors.Errorf("checking registration for unit %q: %w", unit, ErrUnitNotFound)
+	switch {
+	case unit == "":
+		return xerrors.Errorf("updating status for unit %q: %w", unit, ErrUnitIDRequired)
+	case !m.registered(unit):
+		return xerrors.Errorf("unit %q must be registered first: %w", unit, ErrUnitNotFound)
 	}
 
 	u := m.units[unit]
@@ -212,6 +233,10 @@ func (m *Manager) GetAllDependencies(unit ID) ([]Dependency, error) {
 	m.mu.RLock()
 	defer m.mu.RUnlock()
 
+	if unit == "" {
+		return nil, xerrors.Errorf("unit ID cannot be empty: %w", ErrUnitIDRequired)
+	}
+
 	if !m.registered(unit) {
 		return nil, xerrors.Errorf("checking registration for unit %q: %w", unit, ErrUnitNotFound)
 	}
@@ -225,7 +250,7 @@ func (m *Manager) GetAllDependencies(unit ID) ([]Dependency, error) {
 		requiredStatus := dependency.Edge
 		allDependencies = append(allDependencies, Dependency{
 			Unit:           unit,
-			DependsOn:      dependsOnUnit.id,
+			DependsOn:      dependency.To,
 			RequiredStatus: requiredStatus,
 			CurrentStatus:  dependsOnUnit.status,
 			IsSatisfied:    dependsOnUnit.status == requiredStatus,

agent/unit/manager_test.go

@@ -16,6 +16,37 @@ const (
 	unitD unit.ID = "serviceD"
 )
 
+func TestManager_UnitValidation(t *testing.T) {
+	t.Parallel()
+
+	t.Run("Empty Unit Name", func(t *testing.T) {
+		t.Parallel()
+
+		manager := unit.NewManager()
+
+		err := manager.Register("")
+		require.ErrorIs(t, err, unit.ErrUnitIDRequired)
+		err = manager.AddDependency("", unitA, unit.StatusStarted)
+		require.ErrorIs(t, err, unit.ErrUnitIDRequired)
+		err = manager.AddDependency(unitA, "", unit.StatusStarted)
+		require.ErrorIs(t, err, unit.ErrUnitIDRequired)
+		dependencies, err := manager.GetAllDependencies("")
+		require.ErrorIs(t, err, unit.ErrUnitIDRequired)
+		require.Len(t, dependencies, 0)
+		unmetDependencies, err := manager.GetUnmetDependencies("")
+		require.ErrorIs(t, err, unit.ErrUnitIDRequired)
+		require.Len(t, unmetDependencies, 0)
+		err = manager.UpdateStatus("", unit.StatusStarted)
+		require.ErrorIs(t, err, unit.ErrUnitIDRequired)
+		isReady, err := manager.IsReady("")
+		require.ErrorIs(t, err, unit.ErrUnitIDRequired)
+		require.False(t, isReady)
+		u, err := manager.Unit("")
+		require.ErrorIs(t, err, unit.ErrUnitIDRequired)
+		assert.Equal(t, unit.Unit{}, u)
+	})
+}
+
 func TestManager_Register(t *testing.T) {
 	t.Parallel()
 
@@ -29,10 +60,13 @@ func TestManager_Register(t *testing.T) {
 		require.NoError(t, err)
 
 		// Then: the unit should be ready (no dependencies)
-		u := manager.Unit(unitA)
+		u, err := manager.Unit(unitA)
+		require.NoError(t, err)
 		assert.Equal(t, unitA, u.ID())
 		assert.Equal(t, unit.StatusPending, u.Status())
-		assert.True(t, manager.IsReady(unitA))
+		isReady, err := manager.IsReady(unitA)
+		require.NoError(t, err)
+		assert.True(t, isReady)
 	})
 
 	t.Run("RegisterDuplicateUnit", func(t *testing.T) {
@@ -56,9 +90,12 @@ func TestManager_Register(t *testing.T) {
 		require.ErrorIs(t, err, unit.ErrUnitAlreadyRegistered)
 
 		// Then: the unit status should not be overwritten
-		u := manager.Unit(unitA)
+		u, err := manager.Unit(unitA)
+		require.NoError(t, err)
 		assert.Equal(t, unit.StatusStarted, u.Status())
-		assert.True(t, manager.IsReady(unitA))
+		isReady, err := manager.IsReady(unitA)
+		require.NoError(t, err)
+		assert.True(t, isReady)
 	})
 
 	t.Run("RegisterMultipleUnits", func(t *testing.T) {
@@ -75,9 +112,12 @@ func TestManager_Register(t *testing.T) {
 
 		// Then: all units should be ready initially
 		for _, unitID := range unitIDs {
-			u := manager.Unit(unitID)
+			u, err := manager.Unit(unitID)
+			require.NoError(t, err)
 			assert.Equal(t, unit.StatusPending, u.Status())
-			assert.True(t, manager.IsReady(unitID))
+			isReady, err := manager.IsReady(unitID)
+			require.NoError(t, err)
+			assert.True(t, isReady)
 		}
 	})
 }
@@ -101,28 +141,38 @@ func TestManager_AddDependency(t *testing.T) {
 		require.NoError(t, err)
 
 		// Then: Unit A should not be ready (depends on B)
-		u := manager.Unit(unitA)
+		u, err := manager.Unit(unitA)
+		require.NoError(t, err)
 		assert.Equal(t, unit.StatusPending, u.Status())
-		assert.False(t, manager.IsReady(unitA))
+		isReady, err := manager.IsReady(unitA)
+		require.NoError(t, err)
+		assert.False(t, isReady)
 
 		// Then: Unit B should still be ready (no dependencies)
-		u = manager.Unit(unitB)
+		u, err = manager.Unit(unitB)
+		require.NoError(t, err)
 		assert.Equal(t, unit.StatusPending, u.Status())
-		assert.True(t, manager.IsReady(unitB))
+		isReady, err = manager.IsReady(unitB)
+		require.NoError(t, err)
+		assert.True(t, isReady)
 
 		// When: Unit B is started
 		err = manager.UpdateStatus(unitB, unit.StatusStarted)
 		require.NoError(t, err)
 
 		// Then: Unit A should be ready, because its dependency is now in the desired state.
-		assert.True(t, manager.IsReady(unitA))
+		isReady, err = manager.IsReady(unitA)
+		require.NoError(t, err)
+		assert.True(t, isReady)
 
 		// When: Unit B is stopped
 		err = manager.UpdateStatus(unitB, unit.StatusPending)
 		require.NoError(t, err)
 
 		// Then: Unit A should no longer be ready, because its dependency is not in the desired state.
-		assert.False(t, manager.IsReady(unitA))
+		isReady, err = manager.IsReady(unitA)
+		require.NoError(t, err)
+		assert.False(t, isReady)
 	})
 
 	t.Run("AddDependencyByAnUnregisteredDependentUnit", func(t *testing.T) {
@@ -156,11 +206,22 @@ func TestManager_AddDependency(t *testing.T) {
 		err = manager.AddDependency(unitA, unitB, unit.StatusStarted)
 		require.NoError(t, err)
 
-		u := manager.Unit(unitB)
+		// Then: The dependency should be visible in Unit A's status
+		dependencies, err := manager.GetAllDependencies(unitA)
+		require.NoError(t, err)
+		require.Len(t, dependencies, 1)
+		assert.Equal(t, unitB, dependencies[0].DependsOn)
+		assert.Equal(t, unit.StatusStarted, dependencies[0].RequiredStatus)
+		assert.False(t, dependencies[0].IsSatisfied)
+
+		u, err := manager.Unit(unitB)
+		require.NoError(t, err)
 		assert.Equal(t, unit.StatusNotRegistered, u.Status())
 
 		// Then: Unit A should not be ready, because it depends on Unit B
-		assert.False(t, manager.IsReady(unitA))
+		isReady, err := manager.IsReady(unitA)
+		require.NoError(t, err)
+		assert.False(t, isReady)
 
 		// When: Unit B is registered
 		err = manager.Register(unitB)
@@ -168,14 +229,18 @@ func TestManager_AddDependency(t *testing.T) {
 
 		// Then: Unit A should still not be ready.
 		// Unit B is not registered, but it has not been started as required by the dependency.
-		assert.False(t, manager.IsReady(unitA))
+		isReady, err = manager.IsReady(unitA)
+		require.NoError(t, err)
+		assert.False(t, isReady)
 
 		// When: Unit B is started
 		err = manager.UpdateStatus(unitB, unit.StatusStarted)
 		require.NoError(t, err)
 
 		// Then: Unit A should be ready, because its dependency is now in the desired state.
-		assert.True(t, manager.IsReady(unitA))
+		isReady, err = manager.IsReady(unitA)
+		require.NoError(t, err)
+		assert.True(t, isReady)
 	})
 
 	t.Run("AddDependencyCreatesACyclicDependency", func(t *testing.T) {
@@ -208,6 +273,32 @@ func TestManager_AddDependency(t *testing.T) {
 		err = manager.AddDependency(unitD, unitA, unit.StatusStarted)
 		require.ErrorIs(t, err, unit.ErrCycleDetected)
 	})
+
+	t.Run("UpdatingADependency", func(t *testing.T) {
+		t.Parallel()
+
+		manager := unit.NewManager()
+
+		// Given units A and B are registered
+		err := manager.Register(unitA)
+		require.NoError(t, err)
+		err = manager.Register(unitB)
+		require.NoError(t, err)
+
+		// Given Unit A depends on Unit B being unit.StatusStarted
+		err = manager.AddDependency(unitA, unitB, unit.StatusStarted)
+		require.NoError(t, err)
+
+		// When: The dependency is updated to unit.StatusComplete
+		err = manager.AddDependency(unitA, unitB, unit.StatusComplete)
+		require.NoError(t, err)
+
+		// Then: Unit A should only have one dependency, and it should be unit.StatusComplete
+		dependencies, err := manager.GetAllDependencies(unitA)
+		require.NoError(t, err)
+		require.Len(t, dependencies, 1)
+		assert.Equal(t, unit.StatusComplete, dependencies[0].RequiredStatus)
+	})
 }
 
 func TestManager_UpdateStatus(t *testing.T) {
@@ -229,18 +320,24 @@ func TestManager_UpdateStatus(t *testing.T) {
 		require.NoError(t, err)
 
 		// Then: Unit A should not be ready (depends on B)
-		u := manager.Unit(unitA)
+		u, err := manager.Unit(unitA)
+		require.NoError(t, err)
 		assert.Equal(t, unit.StatusPending, u.Status())
-		assert.False(t, manager.IsReady(unitA))
+		isReady, err := manager.IsReady(unitA)
+		require.NoError(t, err)
+		assert.False(t, isReady)
 
 		// When: Unit B is started
 		err = manager.UpdateStatus(unitB, unit.StatusStarted)
 		require.NoError(t, err)
 
 		// Then: Unit A should be ready, because its dependency is now in the desired state.
-		u = manager.Unit(unitA)
+		u, err = manager.Unit(unitA)
+		require.NoError(t, err)
 		assert.Equal(t, unit.StatusPending, u.Status())
-		assert.True(t, manager.IsReady(unitA))
+		isReady, err = manager.IsReady(unitA)
+		require.NoError(t, err)
+		assert.True(t, isReady)
 	})
 
 	t.Run("UpdateStatusWithUnregisteredUnit", func(t *testing.T) {
@@ -276,43 +373,64 @@ func TestManager_UpdateStatus(t *testing.T) {
 		require.NoError(t, err)
 
 		// Then: only Unit C should be ready (no dependencies)
-		u := manager.Unit(unitC)
+		u, err := manager.Unit(unitC)
+		require.NoError(t, err)
 		assert.Equal(t, unit.StatusPending, u.Status())
-		assert.True(t, manager.IsReady(unitC))
+		isReady, err := manager.IsReady(unitC)
+		require.NoError(t, err)
+		assert.True(t, isReady)
 
-		u = manager.Unit(unitB)
+		u, err = manager.Unit(unitB)
+		require.NoError(t, err)
 		assert.Equal(t, unit.StatusPending, u.Status())
-		assert.False(t, manager.IsReady(unitB))
+		isReady, err = manager.IsReady(unitB)
+		require.NoError(t, err)
+		assert.False(t, isReady)
 
-		u = manager.Unit(unitA)
+		u, err = manager.Unit(unitA)
+		require.NoError(t, err)
 		assert.Equal(t, unit.StatusPending, u.Status())
-		assert.False(t, manager.IsReady(unitA))
+		isReady, err = manager.IsReady(unitA)
+		require.NoError(t, err)
+		assert.False(t, isReady)
 
 		// When: Unit C is completed
 		err = manager.UpdateStatus(unitC, unit.StatusComplete)
 		require.NoError(t, err)
 
 		// Then: Unit B should be ready, because its dependency is now in the desired state.
-		u = manager.Unit(unitB)
+		u, err = manager.Unit(unitB)
+		require.NoError(t, err)
 		assert.Equal(t, unit.StatusPending, u.Status())
-		assert.True(t, manager.IsReady(unitB))
+		isReady, err = manager.IsReady(unitB)
+		require.NoError(t, err)
+		assert.True(t, isReady)
 
-		u = manager.Unit(unitA)
+		u, err = manager.Unit(unitA)
+		require.NoError(t, err)
 		assert.Equal(t, unit.StatusPending, u.Status())
-		assert.False(t, manager.IsReady(unitA))
+		isReady, err = manager.IsReady(unitA)
+		require.NoError(t, err)
+		assert.False(t, isReady)
 
-		u = manager.Unit(unitB)
+		u, err = manager.Unit(unitB)
+		require.NoError(t, err)
 		assert.Equal(t, unit.StatusPending, u.Status())
-		assert.True(t, manager.IsReady(unitB))
+		isReady, err = manager.IsReady(unitB)
+		require.NoError(t, err)
+		assert.True(t, isReady)
 
 		// When: Unit B is started
 		err = manager.UpdateStatus(unitB, unit.StatusStarted)
 		require.NoError(t, err)
 
 		// Then: Unit A should be ready, because its dependency is now in the desired state.
-		u = manager.Unit(unitA)
+		u, err = manager.Unit(unitA)
+		require.NoError(t, err)
 		assert.Equal(t, unit.StatusPending, u.Status())
-		assert.True(t, manager.IsReady(unitA))
+		isReady, err = manager.IsReady(unitA)
+		require.NoError(t, err)
+		assert.True(t, isReady)
 	})
 }
 
@@ -419,19 +537,25 @@ func TestManager_MultipleDependencies(t *testing.T) {
 		require.NoError(t, err)
 
 		// A should not be ready (depends on both B and C)
-		assert.False(t, manager.IsReady(unitA))
+		isReady, err := manager.IsReady(unitA)
+		require.NoError(t, err)
+		assert.False(t, isReady)
 
 		// Update B to unit.StatusStarted - A should still not be ready (needs C too)
 		err = manager.UpdateStatus(unitB, unit.StatusStarted)
 		require.NoError(t, err)
 
-		assert.False(t, manager.IsReady(unitA))
+		isReady, err = manager.IsReady(unitA)
+		require.NoError(t, err)
+		assert.False(t, isReady)
 
 		// Update C to "started" - A should now be ready
 		err = manager.UpdateStatus(unitC, unit.StatusStarted)
 		require.NoError(t, err)
 
-		assert.True(t, manager.IsReady(unitA))
+		isReady, err = manager.IsReady(unitA)
+		require.NoError(t, err)
+		assert.True(t, isReady)
 	})
 
 	t.Run("ComplexDependencyChain", func(t *testing.T) {
@@ -460,30 +584,48 @@ func TestManager_MultipleDependencies(t *testing.T) {
 		require.NoError(t, err)
 
 		// Initially only D is ready
-		assert.True(t, manager.IsReady(unitD))
-		assert.False(t, manager.IsReady(unitB))
-		assert.False(t, manager.IsReady(unitC))
-		assert.False(t, manager.IsReady(unitA))
+		isReady, err := manager.IsReady(unitD)
+		require.NoError(t, err)
+		assert.True(t, isReady)
+		isReady, err = manager.IsReady(unitB)
+		require.NoError(t, err)
+		assert.False(t, isReady)
+		isReady, err = manager.IsReady(unitC)
+		require.NoError(t, err)
+		assert.False(t, isReady)
+		isReady, err = manager.IsReady(unitA)
+		require.NoError(t, err)
+		assert.False(t, isReady)
 
 		// Update D to "completed" - B and C should become ready
 		err = manager.UpdateStatus(unitD, unit.StatusComplete)
 		require.NoError(t, err)
 
-		assert.True(t, manager.IsReady(unitB))
-		assert.True(t, manager.IsReady(unitC))
-		assert.False(t, manager.IsReady(unitA))
+		isReady, err = manager.IsReady(unitB)
+		require.NoError(t, err)
+		assert.True(t, isReady)
+		isReady, err = manager.IsReady(unitC)
+		require.NoError(t, err)
+		assert.True(t, isReady)
+		isReady, err = manager.IsReady(unitA)
+		require.NoError(t, err)
+		assert.False(t, isReady)
 
 		// Update B to unit.StatusStarted - A should still not be ready (needs C)
 		err = manager.UpdateStatus(unitB, unit.StatusStarted)
 		require.NoError(t, err)
 
-		assert.False(t, manager.IsReady(unitA))
+		isReady, err = manager.IsReady(unitA)
+		require.NoError(t, err)
+		assert.False(t, isReady)
 
 		// Update C to "started" - A should now be ready
 		err = manager.UpdateStatus(unitC, unit.StatusStarted)
 		require.NoError(t, err)
 
-		assert.True(t, manager.IsReady(unitA))
+		isReady, err = manager.IsReady(unitA)
+		require.NoError(t, err)
+		assert.True(t, isReady)
 	})
 
 	t.Run("DifferentStatusTypes", func(t *testing.T) {
@@ -512,14 +654,18 @@ func TestManager_MultipleDependencies(t *testing.T) {
 
 		// Then: Unit A should not be ready, because only one of its dependencies is in the desired state.
 		// It still requires Unit C to be completed.
-		assert.False(t, manager.IsReady(unitA))
+		isReady, err := manager.IsReady(unitA)
+		require.NoError(t, err)
+		assert.False(t, isReady)
 
 		// When: Unit C is completed
 		err = manager.UpdateStatus(unitC, unit.StatusComplete)
 		require.NoError(t, err)
 
 		// Then: Unit A should be ready, because both of its dependencies are in the desired state.
-		assert.True(t, manager.IsReady(unitA))
+		isReady, err = manager.IsReady(unitA)
+		require.NoError(t, err)
+		assert.True(t, isReady)
 	})
 }
 
@@ -532,10 +678,13 @@ func TestManager_IsReady(t *testing.T) {
 		manager := unit.NewManager()
 
 		// Given: a unit is not registered
-		u := manager.Unit(unitA)
+		u, err := manager.Unit(unitA)
+		require.NoError(t, err)
 		assert.Equal(t, unit.StatusNotRegistered, u.Status())
 		// Then: the unit is not ready
-		assert.False(t, manager.IsReady(unitA))
+		isReady, err := manager.IsReady(unitA)
+		require.NoError(t, err)
+		assert.False(t, isReady)
 	})
 }