diff --git a/client/llb/exec.go b/client/llb/exec.go
index 9dec170f0..c61b5cd32 100644
--- a/client/llb/exec.go
+++ b/client/llb/exec.go
@@ -142,6 +142,23 @@ func (e *ExecOp) Marshal(c *Constraints) (digest.Digest, []byte, *pb.OpMetadata,
 			FtpProxy:   p.FtpProxy,
 			NoProxy:    p.NoProxy,
 		}
+		addCap(&e.constraints, pb.CapExecMetaProxy)
+	}
+
+	addCap(&e.constraints, pb.CapExecMetaBase)
+
+	for _, m := range e.mounts {
+		if m.selector != "" {
+			addCap(&e.constraints, pb.CapExecMountSelector)
+		}
+		if m.cacheID != "" {
+			addCap(&e.constraints, pb.CapExecMountCache)
+			addCap(&e.constraints, pb.CapExecMountCacheSharing)
+		} else if m.tmpfs {
+			addCap(&e.constraints, pb.CapExecMountTmpfs)
+		} else if m.source != nil {
+			addCap(&e.constraints, pb.CapExecMountBind)
+		}
 	}
 
 	pop, md := MarshalConstraints(c, &e.constraints)
diff --git a/client/llb/llbbuild/llbbuild.go b/client/llb/llbbuild/llbbuild.go
index 24d71f8f7..f5cdf990f 100644
--- a/client/llb/llbbuild/llbbuild.go
+++ b/client/llb/llbbuild/llbbuild.go
@@ -3,6 +3,7 @@ package llbbuild
 import (
 	"github.com/moby/buildkit/client/llb"
 	"github.com/moby/buildkit/solver/pb"
+	"github.com/moby/buildkit/util/apicaps"
 	digest "github.com/opencontainers/go-digest"
 )
 
@@ -61,6 +62,11 @@ func (b *build) Marshal(c *llb.Constraints) (digest.Digest, []byte, *pb.OpMetada
 		pbo.Attrs[pb.AttrLLBDefinitionFilename] = b.info.DefinitionFilename
 	}
 
+	if b.constraints.Metadata.Caps == nil {
+		b.constraints.Metadata.Caps = make(map[apicaps.CapID]bool)
+	}
+	b.constraints.Metadata.Caps[pb.CapBuildOpLLBFileName] = true
+
 	pop, md := llb.MarshalConstraints(c, &b.constraints)
 	pop.Op = &pb.Op_Build{
 		Build: pbo,
diff --git a/client/llb/source.go b/client/llb/source.go
index 834e7ef25..f752a6b0d 100644
--- a/client/llb/source.go
+++ b/client/llb/source.go
@@ -10,6 +10,7 @@ import (
 
 	"github.com/docker/distribution/reference"
 	"github.com/moby/buildkit/solver/pb"
+	"github.com/moby/buildkit/util/apicaps"
 	digest "github.com/opencontainers/go-digest"
 	"github.com/pkg/errors"
 )
@@ -58,6 +59,7 @@ func (s *SourceOp) Marshal(constraints *Constraints) (digest.Digest, []byte, *pb
 				uid = constraints.LocalUniqueID
 			}
 			s.attrs[pb.AttrLocalUniqueID] = uid
+			addCap(&s.constraints, pb.CapSourceLocalUnique)
 		}
 	}
 	proto, md := MarshalConstraints(constraints, &s.constraints)
@@ -96,6 +98,9 @@ func Image(ref string, opts ...ImageOption) State {
 	for _, opt := range opts {
 		opt.SetImageOption(&info)
 	}
+
+	addCap(&info.Constraints, pb.CapSourceImage)
+
 	src := NewSource("docker-image://"+ref, nil, info.Constraints) // controversial
 	if err != nil {
 		src.err = err
@@ -174,10 +179,15 @@ func Git(remote, ref string, opts ...GitOption) State {
 	attrs := map[string]string{}
 	if gi.KeepGitDir {
 		attrs[pb.AttrKeepGitDir] = "true"
+		addCap(&gi.Constraints, pb.CapSourceGitKeepDir)
 	}
 	if url != "" {
 		attrs[pb.AttrFullRemoteURL] = url
+		addCap(&gi.Constraints, pb.CapSourceGitFullURL)
 	}
+
+	addCap(&gi.Constraints, pb.CapSourceGit)
+
 	source := NewSource("git://"+id, attrs, gi.Constraints)
 	return NewState(source.Output())
 }
@@ -215,20 +225,27 @@ func Local(name string, opts ...LocalOption) State {
 	attrs := map[string]string{}
 	if gi.SessionID != "" {
 		attrs[pb.AttrLocalSessionID] = gi.SessionID
+		addCap(&gi.Constraints, pb.CapSourceLocalSessionID)
 	}
 	if gi.IncludePatterns != "" {
 		attrs[pb.AttrIncludePatterns] = gi.IncludePatterns
+		addCap(&gi.Constraints, pb.CapSourceLocalIncludePatterns)
 	}
 	if gi.FollowPaths != "" {
 		attrs[pb.AttrFollowPaths] = gi.FollowPaths
+		addCap(&gi.Constraints, pb.CapSourceLocalFollowPaths)
 	}
 	if gi.ExcludePatterns != "" {
 		attrs[pb.AttrExcludePatterns] = gi.ExcludePatterns
+		addCap(&gi.Constraints, pb.CapSourceLocalExcludePatterns)
 	}
 	if gi.SharedKeyHint != "" {
 		attrs[pb.AttrSharedKeyHint] = gi.SharedKeyHint
+		addCap(&gi.Constraints, pb.CapSourceLocalSharedKeyHint)
 	}
 
+	addCap(&gi.Constraints, pb.CapSourceLocal)
+
 	source := NewSource("local://"+name, attrs, gi.Constraints)
 	return NewState(source.Output())
 }
@@ -305,20 +322,25 @@ func HTTP(url string, opts ...HTTPOption) State {
 	attrs := map[string]string{}
 	if hi.Checksum != "" {
 		attrs[pb.AttrHTTPChecksum] = hi.Checksum.String()
+		addCap(&hi.Constraints, pb.CapSourceHTTPChecksum)
 	}
 	if hi.Filename != "" {
 		attrs[pb.AttrHTTPFilename] = hi.Filename
 	}
 	if hi.Perm != 0 {
 		attrs[pb.AttrHTTPPerm] = "0" + strconv.FormatInt(int64(hi.Perm), 8)
+		addCap(&hi.Constraints, pb.CapSourceHTTPPerm)
 	}
 	if hi.UID != 0 {
 		attrs[pb.AttrHTTPUID] = strconv.Itoa(hi.UID)
+		addCap(&hi.Constraints, pb.CapSourceHTTPUIDGID)
 	}
-	if hi.UID != 0 {
+	if hi.GID != 0 {
 		attrs[pb.AttrHTTPGID] = strconv.Itoa(hi.GID)
+		addCap(&hi.Constraints, pb.CapSourceHTTPUIDGID)
 	}
 
+	addCap(&hi.Constraints, pb.CapSourceHTTP)
 	source := NewSource(url, attrs, hi.Constraints)
 	return NewState(source.Output())
 }
@@ -370,3 +392,10 @@ func Chown(uid, gid int) HTTPOption {
 func platformSpecificSource(id string) bool {
 	return strings.HasPrefix(id, "docker-image://")
 }
+
+func addCap(c *Constraints, id apicaps.CapID) {
+	if c.Metadata.Caps == nil {
+		c.Metadata.Caps = make(map[apicaps.CapID]bool)
+	}
+	c.Metadata.Caps[id] = true
+}
diff --git a/client/llb/state.go b/client/llb/state.go
index a0a985000..22cc72499 100644
--- a/client/llb/state.go
+++ b/client/llb/state.go
@@ -6,6 +6,7 @@ import (
 	"github.com/containerd/containerd/platforms"
 	"github.com/moby/buildkit/identity"
 	"github.com/moby/buildkit/solver/pb"
+	"github.com/moby/buildkit/util/apicaps"
 	"github.com/moby/buildkit/util/system"
 	digest "github.com/opencontainers/go-digest"
 	specs "github.com/opencontainers/image-spec/specs-go/v1"
@@ -100,6 +101,28 @@ func (s State) Marshal(co ...ConstraintsOpt) (*Definition, error) {
 		return def, err
 	}
 	def.Def = append(def.Def, dt)
+
+	dgst := digest.FromBytes(dt)
+	md := def.Metadata[dgst]
+	md.Caps = map[apicaps.CapID]bool{
+		pb.CapConstraints: true,
+		pb.CapPlatform:    true,
+	}
+
+	for _, m := range def.Metadata {
+		if m.IgnoreCache {
+			md.Caps[pb.CapMetaIgnoreCache] = true
+		}
+		if m.Description != nil {
+			md.Caps[pb.CapMetaDescription] = true
+		}
+		if m.ExportCache != nil {
+			md.Caps[pb.CapMetaExportCache] = true
+		}
+	}
+
+	def.Metadata[dgst] = md
+
 	return def, nil
 }
 
@@ -310,6 +333,13 @@ func mergeMetadata(m1, m2 pb.OpMetadata) pb.OpMetadata {
 		m1.ExportCache = m2.ExportCache
 	}
 
+	for k := range m2.Caps {
+		if m1.Caps == nil {
+			m1.Caps = make(map[apicaps.CapID]bool, len(m2.Caps))
+		}
+		m1.Caps[k] = true
+	}
+
 	return m1
 }
 
diff --git a/frontend/gateway/gateway.go b/frontend/gateway/gateway.go
index 7f6e2c179..068d92e3c 100644
--- a/frontend/gateway/gateway.go
+++ b/frontend/gateway/gateway.go
@@ -453,7 +453,7 @@ func (lbf *llbBridgeForwarder) Ping(context.Context, *pb.PingRequest) (*pb.PongR
 	return &pb.PongResponse{
 		FrontendAPICaps: pb.Caps.All(),
 		Workers:         pbWorkers,
-		// TODO: add LLB info
+		LLBCaps:         opspb.Caps.All(),
 	}, nil
 }
 
diff --git a/solver/pb/caps.go b/solver/pb/caps.go
new file mode 100644
index 000000000..49e74676e
--- /dev/null
+++ b/solver/pb/caps.go
@@ -0,0 +1,224 @@
+package pb
+
+import "github.com/moby/buildkit/util/apicaps"
+
+var Caps apicaps.CapList
+
+// Every backwards or forwards non-compatible change needs to add a new capability row.
+// By default new capabilities should be experimental. After merge a capability is
+// considered immutable. After a capability is marked stable it should not be disabled.
+
+const (
+	CapSourceImage                apicaps.CapID = "source.image"
+	CapSourceLocal                apicaps.CapID = "source.local"
+	CapSourceLocalUnique          apicaps.CapID = "source.local.unique"
+	CapSourceLocalSessionID       apicaps.CapID = "source.local.sessionid"
+	CapSourceLocalIncludePatterns apicaps.CapID = "source.local.includepatterns"
+	CapSourceLocalFollowPaths     apicaps.CapID = "source.local.followpaths"
+	CapSourceLocalExcludePatterns apicaps.CapID = "source.local.excludepatterns"
+	CapSourceLocalSharedKeyHint   apicaps.CapID = "source.local.sharedkeyhint"
+
+	CapSourceGit        apicaps.CapID = "source.git"
+	CapSourceGitKeepDir apicaps.CapID = "source.git.keepgitdir"
+	CapSourceGitFullURL apicaps.CapID = "source.git.fullurl"
+
+	CapSourceHTTP         apicaps.CapID = "source.http"
+	CapSourceHTTPChecksum apicaps.CapID = "source.http.checksum"
+	CapSourceHTTPPerm     apicaps.CapID = "source.http.perm"
+	CapSourceHTTPUIDGID   apicaps.CapID = "soruce.http.uidgid"
+
+	CapBuildOpLLBFileName apicaps.CapID = "source.buildop.llbfilename"
+
+	CapExecMetaBase          apicaps.CapID = "exec.meta.base"
+	CapExecMetaProxy         apicaps.CapID = "exec.meta.proxyenv"
+	CapExecMountBind         apicaps.CapID = "exec.mount.bind"
+	CapExecMountCache        apicaps.CapID = "exec.mount.cache"
+	CapExecMountCacheSharing apicaps.CapID = "exec.mount.cache.sharing"
+	CapExecMountSelector     apicaps.CapID = "exec.mount.selector"
+	CapExecMountTmpfs        apicaps.CapID = "exec.mount.tmpfs"
+	CapMountSecret           apicaps.CapID = "exec.mount.secret"
+
+	CapConstraints apicaps.CapID = "constraints"
+	CapPlatform    apicaps.CapID = "platform"
+
+	CapMetaIgnoreCache apicaps.CapID = "meta.ignorecache"
+	CapMetaDescription apicaps.CapID = "meta.description"
+	CapMetaExportCache apicaps.CapID = "meta.exportcache"
+)
+
+func init() {
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapSourceImage,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapSourceLocal,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapSourceLocalUnique,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapSourceLocalSessionID,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapSourceLocalIncludePatterns,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapSourceLocalFollowPaths,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapSourceLocalExcludePatterns,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapSourceLocalSharedKeyHint,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+	Caps.Init(apicaps.Cap{
+		ID:      CapSourceGit,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapSourceGitKeepDir,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapSourceGitFullURL,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapSourceHTTP,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapSourceHTTPChecksum,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapSourceHTTPPerm,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapSourceHTTPUIDGID,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapBuildOpLLBFileName,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapExecMetaBase,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapExecMetaProxy,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapExecMountBind,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapExecMountCache,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapExecMountCacheSharing,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapExecMountSelector,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapExecMountTmpfs,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapMountSecret,
+		Enabled: false, // example for future
+		Status:  apicaps.CapStatusExperimental,
+	})
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapConstraints,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapPlatform,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapMetaIgnoreCache,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapMetaDescription,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapMetaExportCache,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
+}
diff --git a/solver/pb/ops.pb.go b/solver/pb/ops.pb.go
index 881e87c34..8cbb906ad 100644
--- a/solver/pb/ops.pb.go
+++ b/solver/pb/ops.pb.go
@@ -37,6 +37,7 @@ import math "math"
 import _ "github.com/gogo/protobuf/gogoproto"
 
 import github_com_opencontainers_go_digest "github.com/opencontainers/go-digest"
+import github_com_moby_buildkit_util_apicaps "github.com/moby/buildkit/util/apicaps"
 
 import io "io"
 
@@ -661,7 +662,8 @@ type OpMetadata struct {
 	Description map[string]string `protobuf:"bytes,2,rep,name=description" json:"description,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 	// index 3 reserved for WorkerConstraint in previous versions
 	// WorkerConstraint worker_constraint = 3;
-	ExportCache *ExportCache `protobuf:"bytes,4,opt,name=export_cache,json=exportCache" json:"export_cache,omitempty"`
+	ExportCache *ExportCache                                         `protobuf:"bytes,4,opt,name=export_cache,json=exportCache" json:"export_cache,omitempty"`
+	Caps        map[github_com_moby_buildkit_util_apicaps.CapID]bool `protobuf:"bytes,5,rep,name=caps,castkey=github.com/moby/buildkit/util/apicaps.CapID" json:"caps" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"varint,2,opt,name=value,proto3"`
 }
 
 func (m *OpMetadata) Reset()                    { *m = OpMetadata{} }
@@ -690,6 +692,13 @@ func (m *OpMetadata) GetExportCache() *ExportCache {
 	return nil
 }
 
+func (m *OpMetadata) GetCaps() map[github_com_moby_buildkit_util_apicaps.CapID]bool {
+	if m != nil {
+		return m.Caps
+	}
+	return nil
+}
+
 type ExportCache struct {
 	Value bool `protobuf:"varint,1,opt,name=Value,proto3" json:"Value,omitempty"`
 }
@@ -1476,6 +1485,27 @@ func (m *OpMetadata) MarshalTo(dAtA []byte) (int, error) {
 		}
 		i += n13
 	}
+	if len(m.Caps) > 0 {
+		for k, _ := range m.Caps {
+			dAtA[i] = 0x2a
+			i++
+			v := m.Caps[k]
+			mapSize := 1 + len(k) + sovOps(uint64(len(k))) + 1 + 1
+			i = encodeVarintOps(dAtA, i, uint64(mapSize))
+			dAtA[i] = 0xa
+			i++
+			i = encodeVarintOps(dAtA, i, uint64(len(k)))
+			i += copy(dAtA[i:], k)
+			dAtA[i] = 0x10
+			i++
+			if v {
+				dAtA[i] = 1
+			} else {
+				dAtA[i] = 0
+			}
+			i++
+		}
+	}
 	return i, nil
 }
 
@@ -1940,6 +1970,14 @@ func (m *OpMetadata) Size() (n int) {
 		l = m.ExportCache.Size()
 		n += 1 + l + sovOps(uint64(l))
 	}
+	if len(m.Caps) > 0 {
+		for k, v := range m.Caps {
+			_ = k
+			_ = v
+			mapEntrySize := 1 + len(k) + sovOps(uint64(len(k))) + 1 + 1
+			n += mapEntrySize + 1 + sovOps(uint64(mapEntrySize))
+		}
+	}
 	return n
 }
 
@@ -4234,6 +4272,115 @@ func (m *OpMetadata) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 5:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Caps", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowOps
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthOps
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.Caps == nil {
+				m.Caps = make(map[github_com_moby_buildkit_util_apicaps.CapID]bool)
+			}
+			var mapkey github_com_moby_buildkit_util_apicaps.CapID
+			var mapvalue bool
+			for iNdEx < postIndex {
+				entryPreIndex := iNdEx
+				var wire uint64
+				for shift := uint(0); ; shift += 7 {
+					if shift >= 64 {
+						return ErrIntOverflowOps
+					}
+					if iNdEx >= l {
+						return io.ErrUnexpectedEOF
+					}
+					b := dAtA[iNdEx]
+					iNdEx++
+					wire |= (uint64(b) & 0x7F) << shift
+					if b < 0x80 {
+						break
+					}
+				}
+				fieldNum := int32(wire >> 3)
+				if fieldNum == 1 {
+					var stringLenmapkey uint64
+					for shift := uint(0); ; shift += 7 {
+						if shift >= 64 {
+							return ErrIntOverflowOps
+						}
+						if iNdEx >= l {
+							return io.ErrUnexpectedEOF
+						}
+						b := dAtA[iNdEx]
+						iNdEx++
+						stringLenmapkey |= (uint64(b) & 0x7F) << shift
+						if b < 0x80 {
+							break
+						}
+					}
+					intStringLenmapkey := int(stringLenmapkey)
+					if intStringLenmapkey < 0 {
+						return ErrInvalidLengthOps
+					}
+					postStringIndexmapkey := iNdEx + intStringLenmapkey
+					if postStringIndexmapkey > l {
+						return io.ErrUnexpectedEOF
+					}
+					mapkey = github_com_moby_buildkit_util_apicaps.CapID(dAtA[iNdEx:postStringIndexmapkey])
+					iNdEx = postStringIndexmapkey
+				} else if fieldNum == 2 {
+					var mapvaluetemp int
+					for shift := uint(0); ; shift += 7 {
+						if shift >= 64 {
+							return ErrIntOverflowOps
+						}
+						if iNdEx >= l {
+							return io.ErrUnexpectedEOF
+						}
+						b := dAtA[iNdEx]
+						iNdEx++
+						mapvaluetemp |= (int(b) & 0x7F) << shift
+						if b < 0x80 {
+							break
+						}
+					}
+					mapvalue = bool(mapvaluetemp != 0)
+				} else {
+					iNdEx = entryPreIndex
+					skippy, err := skipOps(dAtA[iNdEx:])
+					if err != nil {
+						return err
+					}
+					if skippy < 0 {
+						return ErrInvalidLengthOps
+					}
+					if (iNdEx + skippy) > postIndex {
+						return io.ErrUnexpectedEOF
+					}
+					iNdEx += skippy
+				}
+			}
+			m.Caps[github_com_moby_buildkit_util_apicaps.CapID(mapkey)] = mapvalue
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipOps(dAtA[iNdEx:])
@@ -4880,81 +5027,84 @@ var (
 func init() { proto.RegisterFile("ops.proto", fileDescriptorOps) }
 
 var fileDescriptorOps = []byte{
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 }
diff --git a/solver/pb/ops.proto b/solver/pb/ops.proto
index db44c5a4e..fc51646ca 100644
--- a/solver/pb/ops.proto
+++ b/solver/pb/ops.proto
@@ -137,6 +137,8 @@ message OpMetadata {
 	// index 3 reserved for WorkerConstraint in previous versions
 	// WorkerConstraint worker_constraint = 3;
 	ExportCache export_cache = 4;
+	
+	map<string, bool> caps = 5 [(gogoproto.castkey) = "github.com/moby/buildkit/util/apicaps.CapID", (gogoproto.nullable) = false];
 }
 
 message ExportCache {