diff --git a/pkg/capabilities/pb/capabilities.pb.go b/pkg/capabilities/pb/capabilities.pb.go
index bdea7ef5cc..9542030328 100644
--- a/pkg/capabilities/pb/capabilities.pb.go
+++ b/pkg/capabilities/pb/capabilities.pb.go
@@ -1247,6 +1247,7 @@ type InitialiseRequest struct {
 	OrgResolverId       uint32                 `protobuf:"varint,11,opt,name=org_resolver_id,json=orgResolverId,proto3" json:"org_resolver_id,omitempty"`
 	CreSettingsId       uint32                 `protobuf:"varint,12,opt,name=cre_settings_id,json=creSettingsId,proto3" json:"cre_settings_id,omitempty"`
 	TriggerEventStoreId uint32                 `protobuf:"varint,13,opt,name=trigger_event_store_id,json=triggerEventStoreId,proto3" json:"trigger_event_store_id,omitempty"`
+	CapabilityDonId     uint32                 `protobuf:"varint,14,opt,name=capability_don_id,json=capabilityDonId,proto3" json:"capability_don_id,omitempty"`
 	unknownFields       protoimpl.UnknownFields
 	sizeCache           protoimpl.SizeCache
 }
@@ -1372,6 +1373,13 @@ func (x *InitialiseRequest) GetTriggerEventStoreId() uint32 {
 	return 0
 }
 
+func (x *InitialiseRequest) GetCapabilityDonId() uint32 {
+	if x != nil {
+		return x.CapabilityDonId
+	}
+	return 0
+}
+
 type CapabilityInfosReply struct {
 	state         protoimpl.MessageState `protogen:"open.v1"`
 	Infos         []*CapabilityInfoReply `protobuf:"bytes,1,rep,name=infos,proto3" json:"infos,omitempty"`
@@ -1564,7 +1572,7 @@ const file_capabilities_proto_rawDesc = "" +
 	"\x06config\x18\x02 \x01(\v2\x0e.values.v1.MapR\x06config\"\x87\x01\n" +
 	"\x1dUnregisterFromWorkflowRequest\x12>\n" +
 	"\bmetadata\x18\x01 \x01(\v2\".capabilities.RegistrationMetadataR\bmetadata\x12&\n" +
-	"\x06config\x18\x02 \x01(\v2\x0e.values.v1.MapR\x06config\"\x9a\x04\n" +
+	"\x06config\x18\x02 \x01(\v2\x0e.values.v1.MapR\x06config\"\xc6\x04\n" +
 	"\x11InitialiseRequest\x12\x16\n" +
 	"\x06config\x18\x01 \x01(\tR\x06config\x12 \n" +
 	"\ferror_log_id\x18\x02 \x01(\rR\n" +
@@ -1581,7 +1589,8 @@ const file_capabilities_proto_rawDesc = "" +
 	"keystoreId\x12&\n" +
 	"\x0forg_resolver_id\x18\v \x01(\rR\rorgResolverId\x12&\n" +
 	"\x0fcre_settings_id\x18\f \x01(\rR\rcreSettingsId\x123\n" +
-	"\x16trigger_event_store_id\x18\r \x01(\rR\x13triggerEventStoreId\"O\n" +
+	"\x16trigger_event_store_id\x18\r \x01(\rR\x13triggerEventStoreId\x12*\n" +
+	"\x11capability_don_id\x18\x0e \x01(\rR\x0fcapabilityDonId\"O\n" +
 	"\x14CapabilityInfosReply\x127\n" +
 	"\x05infos\x18\x01 \x03(\v2!.capabilities.CapabilityInfoReplyR\x05infos\"@\n" +
 	"\x0eSettingsUpdate\x12\x1a\n" +
diff --git a/pkg/capabilities/pb/capabilities.proto b/pkg/capabilities/pb/capabilities.proto
index b14897247e..cc0ccf5fc9 100644
--- a/pkg/capabilities/pb/capabilities.proto
+++ b/pkg/capabilities/pb/capabilities.proto
@@ -198,6 +198,7 @@ message InitialiseRequest {
   uint32 org_resolver_id = 11;
   uint32 cre_settings_id = 12;
   uint32 trigger_event_store_id = 13;
+  uint32 capability_don_id = 14;
 }
 
 message CapabilityInfosReply {
diff --git a/pkg/loop/internal/core/services/capability/standard/standard_capabilities.go b/pkg/loop/internal/core/services/capability/standard/standard_capabilities.go
index 51f4b54a81..62b8add105 100644
--- a/pkg/loop/internal/core/services/capability/standard/standard_capabilities.go
+++ b/pkg/loop/internal/core/services/capability/standard/standard_capabilities.go
@@ -225,6 +225,7 @@ func (c *StandardCapabilitiesClient) Initialise(ctx context.Context, dependencie
 		OrgResolverId:       orgResolverID,
 		CreSettingsId:       creSettingsID,
 		TriggerEventStoreId: triggerEventStoreID,
+		CapabilityDonId:     dependencies.CapabilityDonID,
 	})
 
 	if err != nil {
@@ -416,6 +417,7 @@ func (s *standardCapabilitiesServer) Initialise(ctx context.Context, request *ca
 		OrgResolver:        orgResolver,
 		CRESettings:        creSettings,
 		TriggerEventStore:  triggerEventStoreClient,
+		CapabilityDonID:    request.CapabilityDonId,
 	}
 
 	if err = s.impl.Initialise(ctx, dependencies); err != nil {
diff --git a/pkg/types/core/standard_capabilities_dependencies.go b/pkg/types/core/standard_capabilities_dependencies.go
index 3cf7ac2898..25add8e6f9 100644
--- a/pkg/types/core/standard_capabilities_dependencies.go
+++ b/pkg/types/core/standard_capabilities_dependencies.go
@@ -22,4 +22,16 @@ type StandardCapabilitiesDependencies struct {
 	OrgResolver        orgresolver.OrgResolver
 	CRESettings        SettingsBroadcaster
 	TriggerEventStore  capabilities.EventStore
+	// CapabilityDonID is the on-chain DON ID of the capability DON this plugin
+	// process was spawned for, resolved authoritatively by the host before
+	// Initialise is called. Plugins should use this as the source of truth for
+	// their own DON identity (e.g. when emitting events that need to carry the
+	// *sending* DON ID, distinct from the consumer workflow's DON ID).
+	//
+	// Zero means the host did not provide one — either a legacy core node that
+	// pre-dates this field, or a boot path that has not yet been updated to
+	// populate it. Plugins SHOULD fall back to resolving via the capability
+	// registry in that case, but the fallback path cannot disambiguate when
+	// the local node belongs to multiple DONs running the same capability.
+	CapabilityDonID uint32
 }