diff --git a/modules/mesh-delivery-builder/cmd/mesh-delivery-builder-tools/main.go b/modules/mesh-delivery-builder/cmd/mesh-delivery-builder-tools/main.go
index 1a1292d4..c40f7be1 100644
--- a/modules/mesh-delivery-builder/cmd/mesh-delivery-builder-tools/main.go
+++ b/modules/mesh-delivery-builder/cmd/mesh-delivery-builder-tools/main.go
@@ -27,9 +27,78 @@ type queueAsker func(key string, value []byte) (json.RawMessage, error)
 
 // Tools are the builder's tools: stuck reads, askAgain writes the reasks value, queue writes a queues value and waits for
 // the builder's read, buildAgain writes a reasks value of mode build and waits for the builder's answer.
-func Tools(r build.StuckReader, askAgain func(key string, value []byte) error, queue, buildAgain queueAsker, since build.LogSince, now func() time.Time, vs versions.Reader) []stdio.Tool {
+// tags writes a tag-asks value and waits for the builder's answer; ta reads tag-asks.
+func Tools(r build.StuckReader, askAgain func(key string, value []byte) error, queue, buildAgain queueAsker, since build.LogSince, now func() time.Time, vs versions.Reader,
+	tags queueAsker, ta versions.Reader) []stdio.Tool {
 	str := func(args map[string]any, k string) string { s, _ := args[k].(string); return strings.TrimSpace(s) }
+	// handAct writes a reasks value of a versions hand act and answers the builder's answer, or its refusal as an error.
+	handAct := func(key string, value []byte, err error) (any, error) {
+		if err != nil {
+			return nil, err
+		}
+		raw, err := buildAgain(key, value)
+		if err != nil {
+			return nil, err
+		}
+		a, err := build.DecodeReAsk(raw)
+		if err != nil {
+			return nil, err
+		}
+		if a.Refused {
+			return nil, errors.New(a.Answer)
+		}
+		return map[string]any{"key": key, "name": a.Name, "do": a.Do, "version": a.Version, "answer": a.Answer}, nil
+	}
+	tagAct := func(key string, value []byte, err error) (any, error) {
+		if err != nil {
+			return nil, err
+		}
+		raw, err := tags(key, value)
+		if err != nil {
+			return nil, err
+		}
+		return versions.DecodeTagAsk(raw)
+	}
+	nameFP := map[string]any{"type": "object", "required": []string{"name", "fp", "why"}, "properties": map[string]any{
+		"name": map[string]any{"type": "string", "description": "the numbered name, <module>/<artifact>, as builder_versions lists it"},
+		"fp":   map[string]any{"type": "string", "description": "the fingerprint, src2:<hex>"},
+		"why":  map[string]any{"type": "string", "description": "why, in plain words"}}}
+	branch := func(head bool) map[string]any {
+		req := []string{"repository", "branch", "why"}
+		props := map[string]any{
+			"repository": map[string]any{"type": "string", "description": "<owner>/<name>"},
+			"branch":     map[string]any{"type": "string", "description": "the branch; its cleaned name is the tag"},
+			"why":        map[string]any{"type": "string", "description": "why, in plain words"}}
+		if head {
+			req = append(req, "head")
+			props["head"] = map[string]any{"type": "string", "description": "the commit the tagged version is built from"}
+		}
+		return map[string]any{"type": "object", "required": req, "properties": props}
+	}
 	return []stdio.Tool{
+		{Name: versions.PublishAgainTool, Description: versions.PublishAgainDescription, Input: nameFP,
+			Run: func(args map[string]any) (any, error) {
+				return handAct(build.NewPublishAgain(str(args, "name"), str(args, "fp"), str(args, "why"), stdio.CallerOf(args), now()))
+			}},
+		{Name: versions.FloorAgainTool, Description: versions.FloorAgainDescription,
+			Input: map[string]any{"type": "object", "required": []string{"name", "why"}, "properties": map[string]any{
+				"name": map[string]any{"type": "string", "description": "the numbered name, <module>/<artifact>"},
+				"why":  map[string]any{"type": "string", "description": "why, in plain words"}}},
+			Run: func(args map[string]any) (any, error) {
+				return handAct(build.NewFloorAgain(str(args, "name"), str(args, "why"), stdio.CallerOf(args), now()))
+			}},
+		{Name: versions.TagTool, Description: versions.TagDescription, Input: branch(true),
+			Run: func(args map[string]any) (any, error) {
+				return tagAct(versions.NewTagAsk(str(args, "repository"), str(args, "branch"), str(args, "head"), str(args, "why"), stdio.CallerOf(args), now()))
+			}},
+		{Name: versions.UntagTool, Description: versions.UntagDescription, Input: branch(false),
+			Run: func(args map[string]any) (any, error) {
+				return tagAct(versions.NewUntag(str(args, "repository"), str(args, "branch"), str(args, "why"), stdio.CallerOf(args), now()))
+			}},
+		{Name: versions.TagAsksTool, Description: versions.TagAsksDescription,
+			Input: map[string]any{"type": "object", "properties": map[string]any{
+				"repository": map[string]any{"type": "string", "description": "only this repository's asks, <owner>/<name>"}}},
+			Run: func(args map[string]any) (any, error) { return versions.AnswerTagAsks(ta, str(args, "repository")) }},
 		{Name: versions.VersionsTool, Description: versions.VersionsDescription,
 			Input: map[string]any{"type": "object", "required": []string{"name"}, "properties": map[string]any{
 				"name":    map[string]any{"type": "string", "description": "the package, image, bundle or archive name"},
@@ -281,7 +350,19 @@ func main() {
 		}
 		return e.Value, true, nil
 	}}
-	if err := stdio.Serve("", Tools(r, put, askQueue(stdio.State(build.QueuesState), 25*time.Second), buildAgain, stdio.Log(delivery.BuilderLog).Since, time.Now, vr)); err != nil {
+	ts := stdio.State(versions.TagAsksState)
+	tags := askKept(ts, versions.TagAsksState, versions.TagAsksBucket, "the ask", 25*time.Second, func(v []byte) bool {
+		a, err := versions.DecodeTagAsk(v)
+		return err == nil && !a.Answered.IsZero()
+	})
+	tr := versions.Reader{Keys: ts.Keys, Get: func(key string) (json.RawMessage, bool, error) {
+		e, err := ts.Get(key)
+		if err != nil || e == nil {
+			return nil, false, err
+		}
+		return e.Value, true, nil
+	}}
+	if err := stdio.Serve("", Tools(r, put, askQueue(stdio.State(build.QueuesState), 25*time.Second), buildAgain, stdio.Log(delivery.BuilderLog).Since, time.Now, vr, tags, tr)); err != nil {
 		fmt.Fprintf(os.Stderr, "[mesh-delivery-builder-tools] %v\n", err)
 		os.Exit(1)
 	}
diff --git a/modules/mesh-delivery-builder/cmd/mesh-delivery-builder/main.go b/modules/mesh-delivery-builder/cmd/mesh-delivery-builder/main.go
index 7bcbe48e..439037ce 100644
--- a/modules/mesh-delivery-builder/cmd/mesh-delivery-builder/main.go
+++ b/modules/mesh-delivery-builder/cmd/mesh-delivery-builder/main.go
@@ -136,11 +136,23 @@ func run(ctx context.Context, getenv func(string) string, logOut io.Writer) erro
 	}
 	// A state bound later numbers the builds looked at without it.
 	versionsKV.Ready(func(jetstream.KeyValue) { b.Reconsider(ctx) })
+	// The versions' hand acts (builder_publish_again, builder_floor_again) come through reasks, as builder_build_again.
+	acts := versions.Acts{Numberer: numberer, Done: doneVia(b), Reconsider: b.Reconsider, Remove: removeVia(calls.Call),
+		BuildAgain: func(ctx context.Context, module, fp, why, by string) (string, bool) {
+			r := b.BuildAgain(ctx, module, fp, why, by, buildAgainBound)
+			if r.Refused != "" {
+				return r.Refused, true
+			}
+			if r.Failed != "" {
+				return "built again, and it failed before its asks were put: " + r.Failed, false
+			}
+			return fmt.Sprintf("built again as revision %d", r.Revision), false
+		}}
 	// A candidate's preview is merged onto the trunk head the indexer previewed it onto: source.main at the candidate's base
 	// revision (the gate's source state). The source's revisions are watched with their history (a direct get of one revision
 	// is not what a read grants): a revision heard after the candidate that names it builds that candidate then. Where it
 	// cannot be read the trunk's keys are built and the candidates wait (issue 1945).
-	errs := make(chan error, 6)
+	errs := make(chan error, 8)
 	trunks := &trunkSource{ctx: ctx, js: js, heads: &sourceHeads{}, moved: func(ctx context.Context) {
 		// A source revision heard is the forge's merge: it wakes a floor whose bridge_tags was silent (design 51 *The floor*).
 		(&floorWake{b: b, waits: floorWaits, logf: logger.Printf}).wake(ctx, versions.WakeForge, "", "")
@@ -263,13 +275,23 @@ func run(ctx context.Context, getenv func(string) string, logOut io.Writer) erro
 	// every other input. The builder asks again by itself without it.
 	// A state not on the bus yet at this start is watched once it appears (issue 1790).
 	process.AwaitBucket(ctx, js, conn, build.ReAsksBucket, "builder_ask_again is not heard; an ask that can no longer be answered is still asked again by itself", logger.Printf).Ready(func(kv jetstream.KeyValue) {
-		eachReAsk := func(e jetstream.KeyValueEntry) { reAsked(ctx, b, kv, e, logger.Printf) }
+		eachReAsk := func(e jetstream.KeyValueEntry) { reAsked(ctx, b, acts, kv, e, logger.Printf) }
 		if rw, err := settle(ctx, kv, eachReAsk); err != nil {
 			process.NotWatched(logger.Printf, build.ReAsksBucket, err, "builder_ask_again is not heard until the builder starts again")
 		} else {
 			go func() { errs <- follow(ctx, rw, eachReAsk) }()
 		}
 	})
+	// A tag ask or a branch's removal by hand (builder_tag, builder_untag) is written to tag-asks and answered there
+	// (design 51 *Tagged versions*); the checker's tag-wanted and the branch's end join it on their consumers (DLV-B6).
+	process.AwaitBucket(ctx, js, conn, versions.TagAsksBucket, "builder_tag and builder_untag are not answered", logger.Printf).Ready(func(kv jetstream.KeyValue) {
+		each := func(e jetstream.KeyValueEntry) { tagAsked(ctx, acts, kv, e, logger.Printf) }
+		if tw, err := settle(ctx, kv, each); err != nil {
+			process.NotWatched(logger.Printf, versions.TagAsksBucket, err, "builder_tag and builder_untag are not answered until the builder starts again")
+		} else {
+			go func() { errs <- follow(ctx, tw, each) }()
+		}
+	})
 	// A person reads a build seat's stream with builder_seat_queue, which writes the queues state (issue 1945 note 62): the
 	// builder alone may read the stream, so it answers there.
 	process.AwaitBucket(ctx, js, conn, build.QueuesBucket, "builder_seat_queue is not answered", logger.Printf).Ready(func(kv jetstream.KeyValue) {
diff --git a/modules/mesh-delivery-builder/cmd/mesh-delivery-builder/reasks.go b/modules/mesh-delivery-builder/cmd/mesh-delivery-builder/reasks.go
index 024528d1..61b1c6a5 100644
--- a/modules/mesh-delivery-builder/cmd/mesh-delivery-builder/reasks.go
+++ b/modules/mesh-delivery-builder/cmd/mesh-delivery-builder/reasks.go
@@ -15,6 +15,7 @@ import (
 	"github.com/nats-io/nats.go/jetstream"
 
 	"mesh-delivery-builder/internal/build"
+	"mesh-delivery-builder/internal/versions"
 )
 
 // askAgainer is the part of the builder a reasks value asks through.
@@ -31,7 +32,7 @@ const buildAgainBound = 15 * time.Second
 // reAsked answers one value of the reasks state (the tool builder_ask_again, issue 1945): a value not yet answered asks the
 // key's waiting lanes again and is written back, by compare-and-set at its revision, with what the builder did. A value
 // answered already (this builder's own write) or deleted is left.
-func reAsked(ctx context.Context, b askAgainer, kv jetstream.KeyValue, e jetstream.KeyValueEntry, logf func(string, ...any)) {
+func reAsked(ctx context.Context, b askAgainer, acts versions.Acts, kv jetstream.KeyValue, e jetstream.KeyValueEntry, logf func(string, ...any)) {
 	if e.Operation() != jetstream.KeyValuePut {
 		return
 	}
@@ -52,6 +53,11 @@ func reAsked(ctx context.Context, b askAgainer, kv jetstream.KeyValue, e jetstre
 		announcedAgain(ctx, b, kv, e, r, logf)
 		return
 	}
+	if r.Mode == build.ModePublishAgain || r.Mode == build.ModeFloorAgain {
+		// A version's hand act (design 51 *Tools of the builder*) may build again, so it is answered beside the watch.
+		go versionActed(ctx, acts, kv, e, r, logf)
+		return
+	}
 	asked := b.AskAgain(e.Key(), r.Why)
 	if len(asked) == 0 {
 		r.Answer = "no ask of this key waits in this builder now (it is not building, or its build has not reached its ask yet): nothing was asked; builder_stuck shows where it stands"
@@ -149,3 +155,27 @@ func appendLog(ctx context.Context, js jetstream.JetStream, cred process.Account
 	}
 	return nil
 }
+
+// versionActed answers a reasks value of builder_publish_again or builder_floor_again, a hand act said in the log.
+func versionActed(ctx context.Context, acts versions.Acts, kv jetstream.KeyValue, e jetstream.KeyValueEntry, r build.ReAsk, logf func(string, ...any)) {
+	var err error
+	if r.Mode == build.ModePublishAgain {
+		var ag versions.Again
+		ag, r.Answer, err = acts.PublishAgain(ctx, r.Name, r.FP, r.Why, r.By, r.At)
+		r.Do, r.Version = ag.Do, ag.Entry.Version
+	} else {
+		r.Answer, err = acts.FloorAgain(ctx, r.Name)
+	}
+	if err != nil {
+		r.Answer, r.Refused = err.Error(), true
+	}
+	r.Answered = time.Now().UTC()
+	logf("%s: %s of %s by %s (%s): %s", e.Key(), r.Mode, r.Name, r.By, r.Why, r.Answer)
+	data, err := json.Marshal(r)
+	if err != nil {
+		return
+	}
+	if _, err := kv.Update(ctx, e.Key(), data, e.Revision()); err != nil && !errors.Is(err, jetstream.ErrKeyExists) && !errors.Is(err, jetstream.ErrKeyRevisionMismatch) {
+		logf("%s.%s: the answer could not be written: %v", build.ReAsksState, e.Key(), err)
+	}
+}
diff --git a/modules/mesh-delivery-builder/cmd/mesh-delivery-builder/versions.go b/modules/mesh-delivery-builder/cmd/mesh-delivery-builder/versions.go
index 5d3b7706..1726c4e3 100644
--- a/modules/mesh-delivery-builder/cmd/mesh-delivery-builder/versions.go
+++ b/modules/mesh-delivery-builder/cmd/mesh-delivery-builder/versions.go
@@ -153,7 +153,11 @@ func floorVia(call toolCaller) versions.FloorSources {
 // emitNumbered says the builder's event version.numbered (design 51 *Events of the builder*), on its own family apart
 // from its builds' ends; the name and version are the bus's dedup id.
 func emitNumbered(ctx context.Context, js jetstream.JetStream, cred process.Account, b versions.NumberedBody) error {
-	if err := emitEvent(ctx, js, cred, versions.NumberedEvent, "numbered-"+versions.Key(b.Name, b.Version), b); err != nil {
+	id := "numbered-" + versions.Key(b.Name, b.Version)
+	if b.Again != "" {
+		id += "-again-" + b.Again
+	}
+	if err := emitEvent(ctx, js, cred, versions.NumberedEvent, id, b); err != nil {
 		return fmt.Errorf("saying %s for %s@%s: %w", versions.NumberedEvent, b.Name, b.Version, err)
 	}
 	return nil
@@ -236,3 +240,55 @@ func (f *floorWake) wake(ctx context.Context, kind, seat, module string) {
 func conditionModules(id string) []string {
 	return strings.FieldsFunc(id, func(r rune) bool { return r == '/' || r == '.' || r == ':' })
 }
+
+// doneVia says whether a build key is done, read from the builder's own builds state: the build's file is held.
+func doneVia(b *build.Builder) func(ctx context.Context, module, fp string) (bool, error) {
+	return func(ctx context.Context, module, fp string) (bool, error) {
+		key, err := delivery.BuilderBuildKey(module, fp)
+		if err != nil {
+			return false, err
+		}
+		raw, _, found, err := b.Claimer.Store.Get(ctx, key)
+		if err != nil || !found {
+			return false, err
+		}
+		cur, err := delivery.DecodeBuilderBuild(raw)
+		if err != nil {
+			return false, err
+		}
+		return cur.State == delivery.BuildDone, nil
+	}
+}
+
+// removeVia calls a registry seat's remove for one tagged version, as the builder's own account (design 51 *Tagged
+// versions*): the reason tag-gone; the seat says removed on its events.
+func removeVia(call toolCaller) func(ctx context.Context, seat string, e versions.Entry) error {
+	return func(_ context.Context, seat string, e versions.Entry) error {
+		_, err := call("seat:"+seat+".remove", map[string]any{"name": e.Name, "version": e.Version, "tag": e.Tag, "reason": "tag-gone"})
+		return err
+	}
+}
+
+// tagAsked answers an unanswered value of tag-asks by compare-and-set at its revision, said in the log.
+func tagAsked(ctx context.Context, acts versions.Acts, kv jetstream.KeyValue, e jetstream.KeyValueEntry, logf func(string, ...any)) {
+	if e.Operation() != jetstream.KeyValuePut {
+		return
+	}
+	t, err := versions.DecodeTagAsk(e.Value())
+	if err != nil {
+		logf("%s.%s holds what is not a tag ask, left: %v", versions.TagAsksState, e.Key(), err)
+		return
+	}
+	if !t.Answered.IsZero() {
+		return
+	}
+	t = acts.TagAsked(ctx, t, time.Now())
+	logf("%s: %s of %s %s by %s (%s): %s", e.Key(), map[bool]string{true: "untag", false: "tag ask"}[t.Untag], t.Repository, t.Branch, t.By, t.Why, t.Answer)
+	data, err := json.Marshal(t)
+	if err != nil {
+		return
+	}
+	if _, err := kv.Update(ctx, e.Key(), data, e.Revision()); err != nil && !errors.Is(err, jetstream.ErrKeyExists) && !errors.Is(err, jetstream.ErrKeyRevisionMismatch) {
+		logf("%s.%s: the answer could not be written: %v", versions.TagAsksState, e.Key(), err)
+	}
+}
diff --git a/modules/mesh-delivery-builder/internal/build/stuck.go b/modules/mesh-delivery-builder/internal/build/stuck.go
index d6a713c0..167db4b6 100644
--- a/modules/mesh-delivery-builder/internal/build/stuck.go
+++ b/modules/mesh-delivery-builder/internal/build/stuck.go
@@ -1,6 +1,8 @@
 package build
 
 import (
+	"mesh-delivery-builder/internal/versions"
+
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -54,6 +56,49 @@ type ReAsk struct {
 	Failed   string            `json:"failed,omitempty"`
 	Revision uint64            `json:"revision,omitempty"`
 	Asks     map[string]string `json:"asks,omitempty"`
+	// Name is the numbered name (`<module>/<artifact>`) of a ModePublishAgain or ModeFloorAgain value; Do and Version the
+	// builder's answer: what it did (versions.Again*) and the version published.
+	Name    string `json:"name,omitempty"`
+	Do      string `json:"do,omitempty"`
+	Version string `json:"version,omitempty"`
+}
+
+// ModePublishAgain is the Mode of a reasks value of builder_publish_again (design 51 *Tools of the builder*).
+const ModePublishAgain = "publish-again"
+
+// ModeFloorAgain is the Mode of a reasks value of builder_floor_again (design 51 *The floor*).
+const ModeFloorAgain = "floor-again"
+
+// NewPublishAgain is the value builder_publish_again writes for a name's fingerprint: the key of the name's module and
+// fingerprint, and the value.
+func NewPublishAgain(name, fp, why, by string, at time.Time) (string, []byte, error) {
+	module, artifact, ok := strings.Cut(strings.TrimSpace(name), "/")
+	if !ok || module == "" || artifact == "" {
+		return "", nil, fmt.Errorf("name %q is not a numbered name, <module>/<artifact>, as builder_versions lists it", name)
+	}
+	key, err := delivery.BuilderBuildKey(module, fp)
+	if err != nil {
+		return "", nil, err
+	}
+	if strings.TrimSpace(why) == "" {
+		return "", nil, errors.New("say why it is published again (why)")
+	}
+	data, err := json.Marshal(ReAsk{V: 1, Why: strings.TrimSpace(why), By: by, At: at.UTC(), Mode: ModePublishAgain, Module: module, FP: fp, Name: strings.TrimSpace(name)})
+	return key, data, err
+}
+
+// NewFloorAgain is the value builder_floor_again writes for a name: the key `floor.<name escaped>`, never a build key,
+// and the value.
+func NewFloorAgain(name, why, by string, at time.Time) (string, []byte, error) {
+	name = strings.TrimSpace(name)
+	if module, artifact, ok := strings.Cut(name, "/"); !ok || module == "" || artifact == "" {
+		return "", nil, fmt.Errorf("name %q is not a numbered name, <module>/<artifact>, as builder_versions lists it", name)
+	}
+	if strings.TrimSpace(why) == "" {
+		return "", nil, errors.New("say why the floor is asked again (why)")
+	}
+	data, err := json.Marshal(ReAsk{V: 1, Why: strings.TrimSpace(why), By: by, At: at.UTC(), Mode: ModeFloorAgain, Name: name})
+	return "floor." + versions.EscapeToken(name), data, err
 }
 
 // ModeBuild is the Mode of a reasks value that asks the key to be built again, not its waiting asks to be asked again.
diff --git a/modules/mesh-delivery-builder/internal/versions/again.go b/modules/mesh-delivery-builder/internal/versions/again.go
new file mode 100644
index 00000000..9de9e48b
--- /dev/null
+++ b/modules/mesh-delivery-builder/internal/versions/again.go
@@ -0,0 +1,315 @@
+package versions
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"sort"
+	"strings"
+	"time"
+)
+
+// What builder_publish_again does with one fingerprint of a name (design 51 *Tools of the builder*), after a holder failed.
+const (
+	// AgainPublish says version.numbered again for the recorded version: the build module publishes the held digest.
+	AgainPublish = "publish"
+	// AgainBuild builds the fingerprint again under the same number: the build's file is gone and no published was said
+	// for the number, so the new digest replaces the recorded one (Numberer.Built).
+	AgainBuild = "build"
+	// AgainRenumber takes a new number: a published was said for the number, so other bytes never go under it.
+	AgainRenumber = "renumber"
+)
+
+// Again is what builder_publish_again does, with the entry it acts on and why.
+type Again struct {
+	Do    string `json:"do"`
+	Entry Entry  `json:"entry"`
+	Why   string `json:"why"`
+}
+
+// PublishAgain decides builder_publish_again for fingerprint among a name's entries; built says whether the builder still
+// holds the build's file (its done key). It refuses a fingerprint not numbered, and a version refused for other bytes
+// than the ones recorded under it.
+func PublishAgain(entries []Entry, fingerprint string, built bool) (Again, error) {
+	fingerprint = strings.TrimSpace(fingerprint)
+	if fingerprint == "" {
+		return Again{}, errors.New("fp is required: the fingerprint whose version is published again")
+	}
+	for _, e := range latestFirst(entries) {
+		if e.Tag != "" || e.Fingerprint != fingerprint {
+			continue
+		}
+		switch {
+		case e.State == Refused && e.RefusedDigest != "" && e.Digest != "" && e.RefusedDigest != e.Digest:
+			return Again{}, fmt.Errorf("%s@%s was refused for other bytes (%s, recorded %s): it is not published again; a new build takes a new number",
+				e.Name, e.Version, e.RefusedDigest, e.Digest)
+		case e.State == Published || e.State == Removed:
+			return Again{Do: AgainRenumber, Entry: e, Why: fmt.Sprintf("%s@%s was %s, so the fingerprint takes a new number", e.Name, e.Version, e.State)}, nil
+		case !built:
+			return Again{Do: AgainBuild, Entry: e, Why: fmt.Sprintf("the build's file is gone and no published was said for %s@%s: built again under the same number", e.Name, e.Version)}, nil
+		}
+		return Again{Do: AgainPublish, Entry: e, Why: fmt.Sprintf("%s@%s (%s) is said numbered again, so its build module publishes the held digest", e.Name, e.Version, e.State)}, nil
+	}
+	return Again{}, fmt.Errorf("fingerprint %s is not numbered for this name: builder_versions lists what is", fingerprint)
+}
+
+// The builder's state of tag asks (design 51 *Tagged versions*): one key per repository and branch, removed when the
+// branch is merged or deleted or its pull request closed.
+const (
+	TagAsksState  = "tag-asks"
+	TagAsksBucket = "mesh-delivery-builder_tag-asks"
+)
+
+// The states of a tag ask.
+const (
+	TagAsked    = "asked"
+	TagNumbered = "numbered"
+	TagRemoving = "removing"
+	TagRemoved  = "removed"
+)
+
+// TagAsk is one value of tag-asks: an ask of a tagged version for a branch's head, from the checker's tag-wanted or by
+// hand (builder_tag), or by hand the removal of the branch's tagged versions (builder_untag, Untag).
+type TagAsk struct {
+	V          int       `json:"v"`
+	Repository string    `json:"repository"`
+	Branch     string    `json:"branch"`
+	Head       string    `json:"head,omitempty"`
+	Tag        string    `json:"tag"`
+	By         string    `json:"by,omitempty"`
+	Why        string    `json:"why,omitempty"`
+	At         time.Time `json:"at"`
+	Untag      bool      `json:"untag,omitempty"`
+	// State, Versions (name to version), Left (what a removal still waits on, name@version to its seat) and Answer are
+	// the builder's.
+	State    string            `json:"state,omitempty"`
+	Versions map[string]string `json:"versions,omitempty"`
+	Left     map[string]string `json:"left,omitempty"`
+	Answer   string            `json:"answer,omitempty"`
+	Answered time.Time         `json:"answered,omitzero"`
+}
+
+// TagAskKey is the key of a repository's branch in tag-asks.
+func TagAskKey(repository, branch string) string {
+	return EscapeToken(repository) + "." + EscapeToken(branch)
+}
+
+// NewTagAsk is the value builder_tag writes: its key and the value. The tag is the branch's, cleaned (CleanTag).
+func NewTagAsk(repository, branch, head, why, by string, at time.Time) (string, []byte, error) {
+	return newTagAsk(repository, branch, head, why, by, at, false)
+}
+
+// NewUntag is the value builder_untag writes: its key and the value.
+func NewUntag(repository, branch, why, by string, at time.Time) (string, []byte, error) {
+	return newTagAsk(repository, branch, "", why, by, at, true)
+}
+
+func newTagAsk(repository, branch, head, why, by string, at time.Time, untag bool) (string, []byte, error) {
+	repository, branch, head, why = strings.TrimSpace(repository), strings.TrimSpace(branch), strings.TrimSpace(head), strings.TrimSpace(why)
+	switch {
+	case repository == "" || !strings.Contains(repository, "/"):
+		return "", nil, errors.New("repository is required: <owner>/<name>")
+	case branch == "":
+		return "", nil, errors.New("branch is required")
+	case !untag && head == "":
+		return "", nil, errors.New("head is required: the commit the tagged version is built from")
+	case why == "":
+		return "", nil, errors.New("say why (why): a hand act is recorded")
+	}
+	data, err := json.Marshal(TagAsk{V: 1, Repository: repository, Branch: branch, Head: head, Tag: CleanTag(branch), By: by, Why: why,
+		At: at.UTC(), Untag: untag, State: TagAsked})
+	return TagAskKey(repository, branch), data, err
+}
+
+// DecodeTagAsk reads a tag-asks value.
+func DecodeTagAsk(data []byte) (TagAsk, error) {
+	var a TagAsk
+	if err := json.Unmarshal(data, &a); err != nil {
+		return a, err
+	}
+	if a.V != 1 {
+		return a, fmt.Errorf("a tag-asks value of version %d, not 1", a.V)
+	}
+	return a, nil
+}
+
+// TagAsksAnswer is what builder_tag_asks answers: the open asks, oldest first.
+type TagAsksAnswer struct {
+	Asks []TagAsk `json:"asks"`
+}
+
+// AnswerTagAsks is builder_tag_asks over the state read, only repository's when it is given.
+func AnswerTagAsks(r Reader, repository string) (TagAsksAnswer, error) {
+	keys, err := r.Keys()
+	if err != nil {
+		return TagAsksAnswer{}, fmt.Errorf("%s cannot be listed: %w", TagAsksState, err)
+	}
+	out := TagAsksAnswer{Asks: []TagAsk{}}
+	for _, k := range keys {
+		raw, ok, err := r.Get(k)
+		if err != nil {
+			return TagAsksAnswer{}, fmt.Errorf("%s.%s: %w", TagAsksState, k, err)
+		}
+		if !ok {
+			continue
+		}
+		a, err := DecodeTagAsk(raw)
+		if err != nil {
+			return TagAsksAnswer{}, fmt.Errorf("%s.%s holds what is not a tag ask: %w", TagAsksState, k, err)
+		}
+		if repository == "" || a.Repository == repository {
+			out.Asks = append(out.Asks, a)
+		}
+	}
+	sort.Slice(out.Asks, func(i, j int) bool { return out.Asks[i].At.Before(out.Asks[j].At) })
+	return out, nil
+}
+
+// Untagged are repository's tagged versions of tag that are not removed (a group's branch spans repositories, each
+// ending apart): what a branch's end, or builder_untag, removes through
+// each one's seat (design 51 *Tagged versions*). A version with no tag is never among them.
+func Untagged(entries []Entry, repository, tag string) []Entry {
+	tag = CleanTag(tag)
+	var out []Entry
+	for _, e := range entries {
+		if e.Tag != "" && e.Repository == repository && CleanTag(e.Tag) == tag && e.State != Removed {
+			out = append(out, e)
+		}
+	}
+	return InOrder(out)
+}
+
+// The tools' descriptions.
+const (
+	PublishAgainDescription = "Publish one fingerprint's version again after its holder failed (design 51): with the build's file held, the " +
+		"builder says version.numbered again and the build module publishes the held digest; with the file gone, it builds the fingerprint " +
+		"again under the same number, the new digest replacing the recorded one, since no published was said for it; after a published (or " +
+		"a removal) it takes a new number. It refuses a fingerprint not numbered and a version the holder refused for other bytes. A hand " +
+		"act, recorded with its caller and why in the builder's log."
+	FloorAgainDescription = "Ask the floor of one name again now, by hand (design 51 *The floor*): the seat's versions, the forge bridge's " +
+		"bridge_tags and the indexer's indexer_requirements, as the builder asks them by itself when a silent source says something. " +
+		"Answers which sources were silent and whether the floor is now known. A name the builder's versions already hold needs no floor: " +
+		"refused, saying so. A hand act."
+	TagDescription = "Ask a tagged version for a branch's head by hand, as the checker's tag-wanted asks it (design 51 *Tagged versions*): " +
+		"the builder keeps the ask in its state tag-asks until the branch is merged or deleted, or its pull request closed, and numbers " +
+		"each package the head builds below the next trunk version (0.1.15-<tag>.2). A hand act."
+	TagAsksDescription = "The open tag asks of the builder's state tag-asks, oldest first: repository, branch, head, tag, who asked and why, " +
+		"its state (asked, numbered, removing, removed), the versions numbered for it and, while its tagged versions are removed, the " +
+		"seats that have not yet said removed. With repository, that repository's only. Read-only."
+	UntagDescription = "Remove a branch's tagged versions by hand, as its merge, its pull request's close or its deletion does (design 51 " +
+		"*Tagged versions*): the builder calls each seat's remove with the reason tag-gone and marks each version removed once its seat says " +
+		"removed. Answers the versions it removes and the seats still waited on. A version with no tag is never removed. A hand act."
+)
+
+// Acts are the builder's hand acts on its versions, answered by its program (the tools bundle writes them to reasks).
+type Acts struct {
+	Numberer *Numberer
+	// Done says whether the build key of module and fingerprint is done: the build's file is held.
+	Done func(ctx context.Context, module, fp string) (bool, error)
+	// BuildAgain builds a failed key again (builder_build_again's path): its answer, or why it refused.
+	BuildAgain func(ctx context.Context, module, fp, why, by string) (answer string, refused bool)
+	// Reconsider looks at every module again, so a claim asks a name's floor.
+	Reconsider func(ctx context.Context)
+	// Remove calls a seat's verb remove for one tagged version, reason tag-gone.
+	Remove func(ctx context.Context, seat string, e Entry) error
+}
+
+// TagAsked answers one unanswered value of tag-asks. An untag calls remove on each of the branch's tagged versions'
+// seats and leaves each in Left until its seat says removed (Heard, on the seat's events); a call that fails stays in
+// Left with its error, asked again by the branch's end. A tag ask is kept: its versions are numbered when the head's
+// packages are claimed for the group's check.
+func (a Acts) TagAsked(ctx context.Context, t TagAsk, now time.Time) TagAsk {
+	t.Answered = now.UTC()
+	if !t.Untag {
+		t.State = TagAsked
+		t.Answer = "kept: each package the head builds is numbered " + "<next>-" + t.Tag + ".<n> when its build is claimed for the check"
+		return t
+	}
+	all, err := a.Numberer.Versions.All(ctx)
+	if err != nil {
+		t.Answer = "nothing removed: " + err.Error()
+		return t
+	}
+	t.Left, t.Versions = map[string]string{}, map[string]string{}
+	for _, e := range Untagged(all, t.Repository, t.Tag) {
+		t.Versions[e.Name] = e.Version
+		at := e.Name + "@" + e.Version
+		t.Left[at] = e.Seat
+		if err := a.Remove(ctx, e.Seat, e); err != nil {
+			t.Left[at] = e.Seat + ": " + err.Error()
+		}
+	}
+	if len(t.Left) == 0 {
+		t.State, t.Left, t.Answer = TagRemoved, nil, "the branch holds no tagged version: nothing to remove"
+		return t
+	}
+	t.State = TagRemoving
+	t.Answer = fmt.Sprintf("remove asked of %d tagged versions; each is marked removed when its seat says removed", len(t.Left))
+	return t
+}
+
+// PublishAgain is builder_publish_again of name's fingerprint: what it did, the version, and its answer; an error refuses.
+func (a Acts) PublishAgain(ctx context.Context, name, fp, why, by string, at time.Time) (Again, string, error) {
+	module, _, _ := strings.Cut(name, "/")
+	entries, err := a.Numberer.Versions.Of(ctx, name)
+	if err != nil {
+		return Again{}, "", err
+	}
+	done, err := a.Done(ctx, module, fp)
+	if err != nil {
+		return Again{}, "", fmt.Errorf("the build key of %s at %s cannot be read: %w", module, fp, err)
+	}
+	ag, err := PublishAgain(entries, fp, done)
+	if err != nil {
+		return Again{}, "", err
+	}
+	e := ag.Entry
+	if ag.Do == AgainRenumber {
+		_, ne, err := a.Numberer.Versions.Number(ctx, Claim{Name: e.Name, Kind: e.Kind, Series: e.Series, Module: e.Module, Fingerprint: e.Fingerprint,
+			Commit: e.Commit, Revision: e.Revision, Seat: e.Seat, Merge: e.Merge, Fresh: true})
+		if err != nil {
+			return Again{}, "", err
+		}
+		ag.Entry = ne
+	}
+	answer := ag.Why
+	if ag.Do == AgainBuild || (ag.Do == AgainRenumber && !done) {
+		said, refused := a.BuildAgain(ctx, module, fp, why, by)
+		if refused {
+			return Again{}, "", fmt.Errorf("%s; and the build again was refused: %s", ag.Why, said)
+		}
+		answer += "; " + said
+	}
+	if ag.Do == AgainPublish || (ag.Do == AgainRenumber && done) {
+		if a.Numberer.Said != nil {
+			b := NumberedOf(ag.Entry, "")
+			b.Again = at.UTC().Format(time.RFC3339Nano)
+			a.Numberer.Said(b)
+		}
+		answer += "; " + NumberedEvent + " said for " + ag.Entry.Version
+	}
+	return ag, answer, nil
+}
+
+// FloorAgain is builder_floor_again of name: the floor counts only for a name the versions hold nothing of.
+func (a Acts) FloorAgain(ctx context.Context, name string) (string, error) {
+	entries, err := a.Numberer.Versions.Of(ctx, name)
+	if err != nil {
+		return "", err
+	}
+	if len(entries) > 0 {
+		return "", fmt.Errorf("%s holds %d versions: its floor counts only for its first number, so nothing is asked", name, len(entries))
+	}
+	answer := name + " waits on no floor in this builder: the floor is asked at its next claim"
+	if a.Numberer.Waits != nil {
+		for _, w := range a.Numberer.Waits.Waiting() {
+			if w.Name == name {
+				answer = fmt.Sprintf("the floor of %s is asked again (%s were silent)", name, strings.Join(w.Silent, ", "))
+			}
+		}
+		a.Numberer.Waits.Wake(WakeByHand, "", "", name)
+	}
+	a.Reconsider(ctx)
+	return answer + "; builder_versions shows its version once numbered", nil
+}
diff --git a/modules/mesh-delivery-builder/internal/versions/claim.go b/modules/mesh-delivery-builder/internal/versions/claim.go
index f16ac6d0..04b3bb27 100644
--- a/modules/mesh-delivery-builder/internal/versions/claim.go
+++ b/modules/mesh-delivery-builder/internal/versions/claim.go
@@ -156,7 +156,7 @@ func (n *Numberer) wait(name, seat string, f Floor, why map[string]string) {
 	n.Waits.Wait(name, seat, holder, f, why, now)
 }
 
-// Built records the digest each numbered artifact was built with, on an entry that holds none yet: what the holder's
+// Built records the digest each numbered artifact was built with, on an entry that holds none yet or was never published: what the holder's
 // builder_versions question compares (ADR 0605 §4).
 func (n *Numberer) Built(ctx context.Context, c BuildClaim, got Numbering, digests map[string]string) error {
 	var errs []string
@@ -166,7 +166,9 @@ func (n *Numberer) Built(ctx context.Context, c BuildClaim, got Numbering, diges
 			continue
 		}
 		if _, err := n.Versions.Mark(ctx, NameOf(c.Module, artifact), version, func(e *Entry) {
-			if e.Digest == "" {
+			// The new digest replaces the recorded one only while no published was said for the number (design 51
+			// *Tools of the builder*): a rebuild of a gone file under the same number.
+			if e.Digest == "" || e.State == Numbered || e.State == Refused {
 				e.Digest = d
 			}
 		}); err != nil {
diff --git a/modules/mesh-delivery-builder/internal/versions/heard.go b/modules/mesh-delivery-builder/internal/versions/heard.go
index e4cb830b..d5223107 100644
--- a/modules/mesh-delivery-builder/internal/versions/heard.go
+++ b/modules/mesh-delivery-builder/internal/versions/heard.go
@@ -48,7 +48,7 @@ func (n *Numberer) Heard(ctx context.Context, seat, event, id string, o Outcome)
 	case HeardRefused:
 		change = func(e *Entry) {
 			if e.State != Published {
-				e.State, e.Reason = Refused, o.Reason
+				e.State, e.Reason, e.RefusedDigest = Refused, o.Reason, o.Digest
 			}
 		}
 	case HeardRemoved:
diff --git a/modules/mesh-delivery-builder/internal/versions/store.go b/modules/mesh-delivery-builder/internal/versions/store.go
index 4101d9b9..b29eff1a 100644
--- a/modules/mesh-delivery-builder/internal/versions/store.go
+++ b/modules/mesh-delivery-builder/internal/versions/store.go
@@ -7,6 +7,9 @@ import (
 	"time"
 )
 
+// AllFilter is the key filter of every version of every name: two tokens.
+const AllFilter = "*.*"
+
 // ErrConflict is what a Store answers when a Create finds the key or an Update finds another revision.
 var ErrConflict = errors.New("the key exists or changed")
 
@@ -15,7 +18,7 @@ type Store interface {
 	Get(ctx context.Context, key string) (value []byte, revision uint64, found bool, err error)
 	Create(ctx context.Context, key string, value []byte) (uint64, error)
 	Update(ctx context.Context, key string, value []byte, revision uint64) (uint64, error)
-	// KeysOf are the keys under a filter (NameFilter).
+	// KeysOf are the keys under a filter (NameFilter, or AllFilter for every key).
 	KeysOf(ctx context.Context, filter string) ([]string, error)
 }
 
@@ -52,10 +55,15 @@ func (v Versions) Of(ctx context.Context, name string) ([]Entry, error) {
 // Claim is one numbering asked of the builder.
 type Claim struct {
 	Name, Kind, Series, Module, Fingerprint, Commit, Revision, Digest, Seat string
+	// Repository is the module's repository, kept on a tagged version for its branch's end.
+	Repository string
 	// Tag asks a tagged version for this cleaned tag; empty for a trunk version.
 	Tag   string
 	Merge uint64
 	Floor Floor
+	// Fresh numbers anew a fingerprint or revision already numbered: builder_publish_again after a published (design 51
+	// *Tools of the builder*).
+	Fresh bool
 }
 
 // Number numbers a claim under compare-and-set: two claims of one name never get one number, the second reading the
@@ -78,7 +86,7 @@ func (v Versions) Number(ctx context.Context, c Claim) (Decision, Entry, error)
 			ver := Tagged(entries, c.Series, c.Tag, c.Floor)
 			d = Decision{Version: ver, Publish: true, Why: "tagged " + ver}
 		} else {
-			d = Decide(entries, c.Kind, c.Series, c.Fingerprint, c.Revision, c.Floor)
+			d = Decide(fresh(entries, c), c.Kind, c.Series, c.Fingerprint, c.Revision, c.Floor)
 		}
 		if d.Version == "" {
 			return d, Entry{}, nil
@@ -93,6 +101,9 @@ func (v Versions) Number(ctx context.Context, c Claim) (Decision, Entry, error)
 		e := Entry{Name: c.Name, Kind: c.Kind, Series: c.Series, Version: d.Version, Tag: c.Tag, Module: c.Module,
 			Fingerprint: c.Fingerprint, Commit: c.Commit, Revision: c.Revision, Digest: c.Digest, Seat: c.Seat,
 			State: Numbered, At: v.now(), Merge: c.Merge}
+		if c.Tag != "" {
+			e.Repository = c.Repository
+		}
 		raw, err := Encode(e)
 		if err != nil {
 			return Decision{}, Entry{}, err
@@ -170,3 +181,43 @@ func (v Versions) now() time.Time {
 	}
 	return time.Now().UTC()
 }
+
+// fresh is entries as Decide reads them for c: with Fresh, the entries of c's fingerprint and revision still count for the
+// next number but keep none.
+func fresh(entries []Entry, c Claim) []Entry {
+	if !c.Fresh {
+		return entries
+	}
+	out := make([]Entry, len(entries))
+	for i, e := range entries {
+		if e.Tag == "" && (e.Fingerprint == c.Fingerprint || (c.Revision != "" && e.Revision == c.Revision)) {
+			e.Fingerprint, e.Revision = "", ""
+		}
+		out[i] = e
+	}
+	return out
+}
+
+// All is every entry of every name, by name in order: what builder_untag and the tag asks read.
+func (v Versions) All(ctx context.Context) ([]Entry, error) {
+	keys, err := v.Store.KeysOf(ctx, AllFilter)
+	if err != nil {
+		return nil, fmt.Errorf("the versions cannot be listed: %w", err)
+	}
+	var out []Entry
+	for _, k := range keys {
+		raw, _, found, err := v.Store.Get(ctx, k)
+		if err != nil {
+			return nil, fmt.Errorf("%s: %w", k, err)
+		}
+		if !found {
+			continue
+		}
+		e, err := Decode(raw)
+		if err != nil {
+			return nil, fmt.Errorf("%s holds what is not a version: %w", k, err)
+		}
+		out = append(out, e)
+	}
+	return out, nil
+}
diff --git a/modules/mesh-delivery-builder/internal/versions/tools.go b/modules/mesh-delivery-builder/internal/versions/tools.go
index ece1d14b..bfe00f39 100644
--- a/modules/mesh-delivery-builder/internal/versions/tools.go
+++ b/modules/mesh-delivery-builder/internal/versions/tools.go
@@ -37,6 +37,8 @@ type NumberedBody struct {
 	Seat        string `json:"seat,omitempty"`
 	// Head is the head the version answers, when it answers a tag ask.
 	Head string `json:"head,omitempty"`
+	// Again is when builder_publish_again said it once more, so the bus's dedup does not drop it.
+	Again string `json:"again,omitempty"`
 }
 
 // NumberedOf is the event of an entry.
@@ -69,6 +71,9 @@ func (s readStore) KeysOf(_ context.Context, filter string) ([]string, error) {
 	if err != nil {
 		return nil, err
 	}
+	if filter == AllFilter {
+		return all, nil
+	}
 	prefix := strings.TrimSuffix(filter, "*")
 	var out []string
 	for _, k := range all {
diff --git a/modules/mesh-delivery-builder/internal/versions/versions.go b/modules/mesh-delivery-builder/internal/versions/versions.go
index 4fd501a9..42c07212 100644
--- a/modules/mesh-delivery-builder/internal/versions/versions.go
+++ b/modules/mesh-delivery-builder/internal/versions/versions.go
@@ -67,8 +67,13 @@ type Entry struct {
 	At    time.Time `json:"at"`
 	// Reason is why it was refused or removed: the holder's reason, a branch's end, retention, the sweep.
 	Reason string `json:"reason,omitempty"`
+	// Repository is a tagged version's repository: its branch's end removes it (Untagged).
+	Repository string `json:"repository,omitempty"`
 	// RemovedBy is the id of the event that removed it.
 	RemovedBy string `json:"removed_by,omitempty"`
+	// RefusedDigest is the digest the holder refused: one other than Digest means the seat was offered other bytes under
+	// this number, which builder_publish_again refuses to publish again (design 51 *Tools of the builder*).
+	RefusedDigest string `json:"refused_digest,omitempty"`
 	// Merge is the forge bridge's sequence of the merge that numbered it, for merge order.
 	Merge uint64 `json:"merge,omitempty"`
 }
diff --git a/modules/mesh-delivery-builder/internal/versions/versions_test.go b/modules/mesh-delivery-builder/internal/versions/versions_test.go
index 42fe6254..a2eef4bd 100644
--- a/modules/mesh-delivery-builder/internal/versions/versions_test.go
+++ b/modules/mesh-delivery-builder/internal/versions/versions_test.go
@@ -61,6 +61,10 @@ func (m *mem) KeysOf(_ context.Context, filter string) ([]string, error) {
 	prefix := strings.TrimSuffix(filter, "*")
 	var out []string
 	for k := range m.vals {
+		if filter == AllFilter {
+			out = append(out, k)
+			continue
+		}
 		if strings.HasPrefix(k, prefix) && !strings.Contains(k[len(prefix):], ".") {
 			out = append(out, k)
 		}
@@ -394,4 +398,161 @@ func TestTheBuildersVersions(t *testing.T) {
 			t.Error("80 % is not full")
 		}
 	})
+	t.Run("publish again", func(t *testing.T) {
+		num := Entry{Name: "m/p", Kind: KindBundle, Version: "0.1.3", Fingerprint: "f1", Digest: "sha256:aa", State: Numbered}
+		ref := num
+		ref.State, ref.RefusedDigest = Refused, "sha256:aa"
+		other := ref
+		other.RefusedDigest = "sha256:bb"
+		pub := num
+		pub.State = Published
+		gone := pub
+		gone.State = Removed
+		tagged := num
+		tagged.Tag, tagged.Version = "feat-x", "0.1.3-feat-x.1"
+		for _, c := range []struct {
+			name    string
+			entries []Entry
+			fp      string
+			built   bool
+			do      string
+		}{
+			{"a held build is said numbered again", []Entry{num}, "f1", true, AgainPublish},
+			{"refused for its own bytes is published again", []Entry{ref}, "f1", true, AgainPublish},
+			{"a gone file is built again under the same number", []Entry{ref}, "f1", false, AgainBuild},
+			{"after a published it takes a new number", []Entry{pub}, "f1", true, AgainRenumber},
+			{"after a removal it takes a new number", []Entry{gone}, "f1", false, AgainRenumber},
+			{"refused for other bytes is refused", []Entry{other}, "f1", true, ""},
+			{"a fingerprint not numbered is refused", []Entry{num}, "f2", true, ""},
+			{"a tagged version is not a trunk fingerprint's", []Entry{tagged}, "f1", true, ""},
+		} {
+			a, err := PublishAgain(c.entries, c.fp, c.built)
+			if (err != nil) != (c.do == "") || a.Do != c.do {
+				t.Errorf("%s: PublishAgain = %+v, %v; want %q", c.name, a, err, c.do)
+			}
+		}
+		ctx := context.Background()
+		// A fresh claim of a published fingerprint takes the next number; the old one stays.
+		st := newMem()
+		v := Versions{Store: st}
+		raw, _ := Encode(Entry{Name: "m/p", Kind: KindBundle, Series: "0.1", Version: "0.1.3", Fingerprint: "f1", State: Published, At: time.Unix(1, 0)})
+		_, _ = st.Create(ctx, Key("m/p", "0.1.3"), raw)
+		if d, _, err := v.Number(ctx, Claim{Name: "m/p", Kind: KindBundle, Fingerprint: "f1"}); err != nil || d.Version != "0.1.3" || !d.Keep {
+			t.Fatalf("a published fingerprint keeps its number: %+v %v", d, err)
+		}
+		if d, e, err := v.Number(ctx, Claim{Name: "m/p", Kind: KindBundle, Fingerprint: "f1", Fresh: true}); err != nil || d.Version != "0.1.4" || d.Keep || e.Fingerprint != "f1" {
+			t.Fatalf("a fresh claim takes the next number: %+v %+v %v", d, e, err)
+		}
+		// A refusal records the digest refused; Built replaces a digest no published was said for, never a published one.
+		n := &Numberer{Versions: v}
+		_, _ = n.Heard(ctx, SeatArtifacts, HeardRefused, "r1", Outcome{Name: "m/p", Version: "0.1.4", Digest: "sha256:old", Reason: "x"})
+		if es, _ := v.Of(ctx, "m/p"); es[1].RefusedDigest != "sha256:old" {
+			t.Errorf("refused records no digest: %+v", es[1])
+		}
+		_, _ = v.Mark(ctx, "m/p", "0.1.4", func(e *Entry) { e.Digest = "sha256:old" })
+		bc := BuildClaim{Module: "m"}
+		_ = n.Built(ctx, bc, Numbering{Versions: map[string]string{"p": "0.1.4"}}, map[string]string{"p": "sha256:new"})
+		_, _ = v.Mark(ctx, "m/p", "0.1.3", func(e *Entry) { e.Digest = "sha256:held" })
+		_ = n.Built(ctx, bc, Numbering{Versions: map[string]string{"p": "0.1.3"}}, map[string]string{"p": "sha256:other"})
+		es, _ := v.Of(ctx, "m/p")
+		if es[0].Digest != "sha256:held" || es[1].Digest != "sha256:new" {
+			t.Errorf("Built: published %s (want sha256:held), refused %s (want sha256:new)", es[0].Digest, es[1].Digest)
+		}
+		if all, err := v.All(ctx); err != nil || len(all) != 2 {
+			t.Errorf("All = %d entries, %v", len(all), err)
+		}
+		// The hand acts: a held build is said numbered once more under a fresh dedup id; a gone one is built again; a
+		// published one takes a new number; a name with versions asks no floor.
+		if _, _, err := (Acts{Numberer: &Numberer{Versions: v}, Done: func(context.Context, string, string) (bool, error) { return true, nil }}).PublishAgain(ctx, "m/p", "f1", "w", "", time.Unix(4, 0)); err == nil {
+			t.Error("a version refused for other bytes is published again")
+		}
+		_, _ = v.Mark(ctx, "m/p", "0.1.4", func(e *Entry) { e.State = Published })
+		var said []NumberedBody
+		var rebuilt []string
+		done := true
+		acts := Acts{Numberer: &Numberer{Versions: v, Said: func(b NumberedBody) { said = append(said, b) }, Waits: &FloorWaits{}},
+			Done: func(context.Context, string, string) (bool, error) { return done, nil },
+			BuildAgain: func(_ context.Context, m, fp, _, _ string) (string, bool) {
+				rebuilt = append(rebuilt, m+" "+fp)
+				return "built again", false
+			},
+			Reconsider: func(context.Context) {}}
+		if ag, _, err := acts.PublishAgain(ctx, "m/p", "f1", "w", "me", time.Unix(5, 0)); err != nil || ag.Do != AgainRenumber || ag.Entry.Version != "0.1.5" ||
+			len(said) != 1 || said[0].Version != "0.1.5" || said[0].Again == "" || len(rebuilt) != 0 {
+			t.Errorf("publish again of a published, held build: %+v %v said %+v rebuilt %v", ag, err, said, rebuilt)
+		}
+		done = false
+		if ag, _, err := acts.PublishAgain(ctx, "m/p", "f1", "w", "me", time.Unix(6, 0)); err != nil || ag.Do != AgainBuild || ag.Entry.Version != "0.1.5" || len(rebuilt) != 1 || len(said) != 1 {
+			t.Errorf("publish again of a gone build: %+v %v said %d rebuilt %v", ag, err, len(said), rebuilt)
+		}
+		if _, err := acts.FloorAgain(ctx, "m/p"); err == nil {
+			t.Error("a name with versions asks its floor again")
+		}
+		if ans, err := acts.FloorAgain(ctx, "m/new"); err != nil || ans == "" {
+			t.Errorf("floor again of a new name: %q %v", ans, err)
+		}
+	})
+	t.Run("tag asks", func(t *testing.T) {
+		at := time.Unix(100, 0)
+		k, raw, err := NewTagAsk("novox/mesh-sdk", "feat/X y", "abc", "a check", "me@shanks", at)
+		if err != nil || k != TagAskKey("novox/mesh-sdk", "feat/X y") || strings.Count(k, ".") != 1 {
+			t.Fatalf("NewTagAsk = %q, %v", k, err)
+		}
+		a, err := DecodeTagAsk(raw)
+		if err != nil || a.Tag != "feat-x-y" || a.State != TagAsked || a.Untag {
+			t.Fatalf("DecodeTagAsk = %+v, %v", a, err)
+		}
+		for _, bad := range [][4]string{{"mesh-sdk", "b", "h", "w"}, {"o/r", "", "h", "w"}, {"o/r", "b", "", "w"}, {"o/r", "b", "h", ""}} {
+			if _, _, err := NewTagAsk(bad[0], bad[1], bad[2], bad[3], "", at); err == nil {
+				t.Errorf("NewTagAsk%v is not refused", bad)
+			}
+		}
+		_, uraw, err := NewUntag("o/r", "feat/x", "branch gone by hand", "", at.Add(time.Second))
+		if u, _ := DecodeTagAsk(uraw); err != nil || !u.Untag {
+			t.Fatalf("NewUntag = %+v, %v", u, err)
+		}
+		vals := map[string][]byte{"a": uraw, "b": raw}
+		r := Reader{Keys: func() ([]string, error) { return []string{"a", "b"}, nil },
+			Get: func(k string) (json.RawMessage, bool, error) { return vals[k], true, nil }}
+		if got, err := AnswerTagAsks(r, ""); err != nil || len(got.Asks) != 2 || got.Asks[0].Repository != "novox/mesh-sdk" {
+			t.Errorf("AnswerTagAsks = %+v, %v", got, err)
+		}
+		if got, _ := AnswerTagAsks(r, "o/r"); len(got.Asks) != 1 || !got.Asks[0].Untag {
+			t.Errorf("AnswerTagAsks(o/r) = %+v", got)
+		}
+		es := []Entry{{Name: "n", Version: "0.1.2-feat-x.1", Tag: "feat-x", Series: "0.1", Repository: "o/r"}, {Name: "n", Version: "0.1.2-feat-x.2", Tag: "feat-x", Series: "0.1", State: Removed, Repository: "o/r"},
+			{Name: "n2", Version: "0.1.2-feat-x.1", Tag: "feat-x", Series: "0.1", Repository: "o/other"},
+			{Name: "n", Version: "0.1.1", Series: "0.1"}, {Name: "n", Version: "0.1.2-feat-y.1", Tag: "feat-y", Series: "0.1"}}
+		if got := Untagged(es, "o/r", "feat/x"); len(got) != 1 || got[0].Version != "0.1.2-feat-x.1" {
+			t.Errorf("Untagged = %+v", got)
+		}
+		st := newMem()
+		for _, e := range append(es, Entry{Name: "n3", Version: "0.1.0-feat-x.1", Tag: "feat-x", Series: "0.1", Repository: "o/r", Seat: SeatNPM}) {
+			e.Kind, e.Module, e.Fingerprint, e.At = KindPackage, "m", "f", at
+			if e.State == "" {
+				e.State = Numbered
+			}
+			raw, err := Encode(e)
+			if err != nil {
+				t.Fatal(err)
+			}
+			_, _ = st.Create(context.Background(), Key(e.Name, e.Version), raw)
+		}
+		var removed []string
+		acts := Acts{Numberer: &Numberer{Versions: Versions{Store: st}}, Remove: func(_ context.Context, seat string, e Entry) error {
+			removed = append(removed, e.Name+"@"+e.Version)
+			if seat == SeatNPM {
+				return errors.New("down")
+			}
+			return nil
+		}}
+		u, _ := DecodeTagAsk(uraw)
+		got := acts.TagAsked(context.Background(), u, at)
+		if got.State != TagRemoving || len(removed) != 2 || len(got.Left) != 2 || !strings.Contains(got.Left["n3@0.1.0-feat-x.1"], "down") || got.Answered.IsZero() {
+			t.Errorf("untag: %+v removed %v", got, removed)
+		}
+		if k := acts.TagAsked(context.Background(), a, at); k.State != TagAsked || k.Answer == "" {
+			t.Errorf("a tag ask is not kept: %+v", k)
+		}
+	})
 }
diff --git a/modules/mesh-delivery-builder/manifest_test.go b/modules/mesh-delivery-builder/manifest_test.go
index 99e63787..cc78f53c 100644
--- a/modules/mesh-delivery-builder/manifest_test.go
+++ b/modules/mesh-delivery-builder/manifest_test.go
@@ -93,7 +93,7 @@ func TestManifestDeclarations(t *testing.T) { // 1607/AC1
 	if m.Module != "mesh-delivery-builder" {
 		t.Errorf("module = %q", m.Module)
 	}
-	if want := []state{{Name: "builds", History: 5}, {Name: "hearing", History: 1}, {Name: "instances", History: 1}, {Name: "queues", History: 1}, {Name: "reasks", History: 1}, {Name: "versions", History: 1}}; !reflect.DeepEqual(m.State, want) { // delivery.BuilderBuildsHistory
+	if want := []state{{Name: "builds", History: 5}, {Name: "hearing", History: 1}, {Name: "instances", History: 1}, {Name: "queues", History: 1}, {Name: "reasks", History: 1}, {Name: "tag-asks", History: 1}, {Name: "versions", History: 1}}; !reflect.DeepEqual(m.State, want) { // delivery.BuilderBuildsHistory
 		t.Errorf("state = %+v, want %+v", m.State, want)
 	}
 	// 1887/A4c: the builder chooses no node, so it reads neither presence nor have, invokes no build module's tool and
@@ -109,8 +109,9 @@ func TestManifestDeclarations(t *testing.T) { // 1607/AC1
 	// other tool; it holds no capacity.
 	// 1955/L7 (ADR 0571 §2): the seat mesh-artifact-sweep's held, the controller's `held` is no longer asked (issue 1955).
 	// Design 51 *The floor*: the floor's three sources, the registry seats' versions, bridge_tags and indexer_requirements.
-	if want := []string{"mesh-delivery-forge-bridge.bridge_tags", "mesh-delivery-indexer.indexer_requirements", "seat:container-image-registry.versions",
-		"seat:go-package-registry.versions", "seat:mesh-artifact-sweep.held", "seat:npm-package-registry.versions", "seat:oci-artifact-registry.versions"}; !reflect.DeepEqual(sorted(m.Invokes), want) || len(m.Config) != 0 {
+	if want := []string{"mesh-delivery-forge-bridge.bridge_tags", "mesh-delivery-indexer.indexer_requirements", "seat:container-image-registry.remove", "seat:container-image-registry.versions",
+		"seat:go-package-registry.remove", "seat:go-package-registry.versions", "seat:mesh-artifact-sweep.held", "seat:npm-package-registry.remove",
+		"seat:npm-package-registry.versions", "seat:oci-artifact-registry.remove", "seat:oci-artifact-registry.versions"}; !reflect.DeepEqual(sorted(m.Invokes), want) || len(m.Config) != 0 {
 		t.Errorf("invokes = %v, config = %v, want %v and no config", m.Invokes, m.Config, want)
 	}
 	// The builder is woken by a build module's report of a toolchain, as the indexer is: the bucket may not exist when it
@@ -128,7 +129,8 @@ func TestManifestDeclarations(t *testing.T) { // 1607/AC1
 		t.Errorf("secrets-owner = %q", m.SecretsOwner)
 	}
 	// 1945: the builder's tools (builder_seat_queue: note 62), served by its tools bundle, and the event it says when it asks an ask again.
-	if want := []string{"builder_announce_again", "builder_ask_again", "builder_build_again", "builder_builds_since", "builder_seat_queue", "builder_stuck", "builder_versions"}; !reflect.DeepEqual(sorted(m.Tools), want) {
+	if want := []string{"builder_announce_again", "builder_ask_again", "builder_build_again", "builder_builds_since", "builder_floor_again",
+		"builder_publish_again", "builder_seat_queue", "builder_stuck", "builder_tag", "builder_tag_asks", "builder_untag", "builder_versions"}; !reflect.DeepEqual(sorted(m.Tools), want) {
 		t.Errorf("tools = %v, want %v", m.Tools, want)
 	}
 	// Design 51 *Events of the builder*: numbered and old-form-closed on the family version, apart from the builds' ends.
diff --git a/modules/mesh-delivery-builder/module.json b/modules/mesh-delivery-builder/module.json
index 0c960725..87c4b61a 100644
--- a/modules/mesh-delivery-builder/module.json
+++ b/modules/mesh-delivery-builder/module.json
@@ -7,8 +7,13 @@
     "builder_ask_again",
     "builder_build_again",
     "builder_builds_since",
+    "builder_floor_again",
+    "builder_publish_again",
     "builder_seat_queue",
     "builder_stuck",
+    "builder_tag",
+    "builder_tag_asks",
+    "builder_untag",
     "builder_versions"
   ],
   "emits": [
@@ -26,10 +31,14 @@
   "invokes": [
     "mesh-delivery-forge-bridge.bridge_tags",
     "mesh-delivery-indexer.indexer_requirements",
+    "seat:container-image-registry.remove",
     "seat:container-image-registry.versions",
+    "seat:go-package-registry.remove",
     "seat:go-package-registry.versions",
     "seat:mesh-artifact-sweep.held",
+    "seat:npm-package-registry.remove",
     "seat:npm-package-registry.versions",
+    "seat:oci-artifact-registry.remove",
     "seat:oci-artifact-registry.versions"
   ],
   "state": [
@@ -38,6 +47,7 @@
     { "name": "instances", "history": 1 },
     { "name": "queues", "history": 1 },
     { "name": "reasks", "history": 1 },
+    { "name": "tag-asks", "history": 1 },
     { "name": "versions", "history": 1 }
   ],
   "logs": [