diff --git a/docs/GUIDE.md b/docs/GUIDE.md
index 27ed3fea17..98a408d9fd 100644
--- a/docs/GUIDE.md
+++ b/docs/GUIDE.md
@@ -144,7 +144,9 @@ allow = ["Bash(go test:*)"]                  # never prompted
 
 [peers]
 # enabled = false              # your sessions on this machine can message each other; every message waits for that session's user to approve it; also a switch in Settings, applied at the next turn (user config only)
-# dispatch = false             # the model may hand a task to a session in another of your projects, via dispatch_to_project; needs enabled (user config only)
+# dispatch = false             # the model may hand a task to a session in another of your projects, via dispatch_to_project; needs enabled; turning it on is your consent for those sessions' tasks and replies, no card (user config only)
+# max_dispatch_depth = 1       # how many sessions deep a dispatch may chain; 0 removes the ceiling (user config only)
+# max_dispatched_sessions = 8  # sessions one session may keep open from its dispatches; 0 removes the ceiling (user config only)
 # release_projects = []        # projects that take messages from your other sessions without the card; their own approvals and sandbox still apply (user config only)
 
 [serve]
diff --git a/docs/GUIDE.zh-CN.md b/docs/GUIDE.zh-CN.md
index 40378fd189..233f50a50d 100644
--- a/docs/GUIDE.zh-CN.md
+++ b/docs/GUIDE.zh-CN.md
@@ -153,7 +153,9 @@ allow = ["Bash(go test:*)"]                  # 从不询问
 
 [peers]
 # enabled = false              # 本机你的各个会话可以互发消息；每条消息都要对方会话的用户批准；设置里也有开关，下个回合起生效（只认用户级配置）
-# dispatch = false             # 模型可用 dispatch_to_project 把任务交给你另一个项目里的会话；需要 enabled（只认用户级配置）
+# dispatch = false             # 模型可用 dispatch_to_project 把任务交给你另一个项目里的会话；需要 enabled；打开就是你对这些会话的任务和回信的总同意，不再出审批卡（只认用户级配置）
+# max_dispatch_depth = 1       # 派发最多能连着开几层会话；0 表示不限（只认用户级配置）
+# max_dispatched_sessions = 8  # 一个会话通过派发最多同时开着几个会话；0 表示不限（只认用户级配置）
 # release_projects = []        # 这些项目收到你其它会话的消息时不弹批准卡；它们自己的审批与沙盒照旧（只认用户级配置）
 
 [serve]
diff --git a/internal/assembly/boot/effect_dispatch_consent_test.go b/internal/assembly/boot/effect_dispatch_consent_test.go
new file mode 100644
index 0000000000..bd484381f6
--- /dev/null
+++ b/internal/assembly/boot/effect_dispatch_consent_test.go
@@ -0,0 +1,80 @@
+package boot
+
+import (
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+
+	"reasonix/internal/state/peermail"
+)
+
+func (p *peerToolProvider) sawInMessages(needle string) bool {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+	for _, req := range p.reqs {
+		for _, m := range req.Messages {
+			if strings.Contains(m.Content, needle) {
+				return true
+			}
+		}
+	}
+	return false
+}
+
+// While the user's dispatch switch is on, a task from the session that opened
+// this one reaches the model with no card, framed as data from that session and
+// not as something the user read; the same words from a session the host never
+// paired it with, or signed with another secret, wait for the user as before.
+func TestEffectADispatchedTaskReachesTheModelWithoutACardAndAStrangersDoesNot(t *testing.T) {
+	const parent = "s-00000000000000bb"
+	secret := []byte("0123456789abcdef0123456789abcdef")
+	rec, ctrl, peersDir, seen := buildPeerToolSession(t, true, "nobody", "hello", "dispatch = true\n")
+	t.Setenv("REASONIX_HOME", filepath.Dir(peersDir))
+	receiver := ctrl.PeerKey()
+	if receiver == "" {
+		t.Fatal("the receiving session did not publish itself")
+	}
+	ctrl.MarkOpenedByDispatch(parent, secret, 1)
+	d, err := peermail.Open(peersDir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	send := func(id, body string, signWith []byte) {
+		t.Helper()
+		m := peermail.Message{ID: id, SentAt: time.Now().UTC(), Body: body,
+			From: peermail.Party{SessionID: parent, Title: "planner", Project: "alpha"}, To: peermail.Party{SessionID: receiver}}
+		m.Proof = peermail.Proof(signWith, m)
+		if err := d.Send(m); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	send("m-forged", "FORGED-TASK-WITH-ANOTHER-SECRET", []byte("another secret another secret!!!"))
+	ctrl.RefreshPeers()
+	if held := ctrl.HeldPeerMessages(); len(held) != 1 || held[0].Body != "FORGED-TASK-WITH-ANOTHER-SECRET" {
+		t.Fatalf("held = %+v, want the badly signed task waiting for a card", held)
+	}
+
+	send("m-real", "ROTATE-THE-KEY-TASK", secret)
+	ctrl.RefreshPeers()
+	waitFor(t, "the dispatched task to reach the provider", func() bool { return rec.sawInMessages("ROTATE-THE-KEY-TASK") })
+	if rec.sawInMessages("FORGED-TASK-WITH-ANOTHER-SECRET") {
+		t.Fatal("a task signed with another secret reached the model")
+	}
+	if !rec.sawInMessages("has not read this message") || !rec.sawInMessages("not an instruction from the user") {
+		t.Fatal("the dispatched task reached the model without saying the user did not read it and that it is data")
+	}
+	// The stub provider's own send_peer_message call is the only card there may be:
+	// nothing asked the user to let the dispatched task in.
+	seen.mu.Lock()
+	for _, card := range seen.approvals {
+		if card.Tool != "send_peer_message" {
+			t.Errorf("unexpected approval card: %+v", card)
+		}
+	}
+	seen.mu.Unlock()
+	if got := ctrl.HeldPeerMessages(); len(got) != 1 {
+		t.Fatalf("held = %+v, want only the badly signed one still waiting", got)
+	}
+}
diff --git a/internal/frontend/serve/dispatch.go b/internal/frontend/serve/dispatch.go
index 52290d4249..5c1647b32c 100644
--- a/internal/frontend/serve/dispatch.go
+++ b/internal/frontend/serve/dispatch.go
@@ -67,7 +67,7 @@ func (h *Hub) dispatchTo(ctx context.Context, from *Runtime, project, text strin
 	}
 	sender, ok := from.Server.Controller().(*control.Controller)
 	if !ok {
-		return control.DispatchResult{}, control.ErrDispatchUnavailable
+		return control.DispatchResult{}, control.ErrDispatchNotLocal
 	}
 	target := h.runtimeByID(h.dispatch.get(from.ID, root))
 	var secret []byte
@@ -84,7 +84,7 @@ func (h *Hub) dispatchTo(ctx context.Context, from *Runtime, project, text strin
 	}
 	targetCtrl, ok := target.Server.Controller().(*control.Controller)
 	if !ok {
-		return control.DispatchResult{}, control.ErrDispatchUnavailable
+		return control.DispatchResult{}, control.ErrDispatchNotLocal
 	}
 	key := targetCtrl.PeerKey()
 	if key == "" {
@@ -122,7 +122,7 @@ func (h *Hub) openDispatchSession(ctx context.Context, from *Runtime, sender *co
 	ctrl, ok := target.Server.Controller().(*control.Controller)
 	if !ok {
 		_ = h.Close(target.ID)
-		return nil, control.ErrDispatchUnavailable
+		return nil, control.ErrDispatchNotLocal
 	}
 	if ctrl.WorkspaceTrust() != config.WorkspaceTrusted {
 		_ = h.Close(target.ID)
diff --git a/internal/session/control/peer_dispatch.go b/internal/session/control/peer_dispatch.go
index 43c48595ea..48037d5285 100644
--- a/internal/session/control/peer_dispatch.go
+++ b/internal/session/control/peer_dispatch.go
@@ -14,10 +14,11 @@ import (
 // Each is an identity the dispatch tool reports; none is matched by its words.
 var (
 	ErrDispatchDisabled       = errors.New(`the user has not turned on "Let the model hand a task to another session" (Settings > Tools > Messages between sessions, which also needs "enabled"; [peers] dispatch in the user config)`)
-	ErrDispatchUnavailable    = errors.New("this session cannot open sessions in other projects")
+	ErrDispatchUnavailable    = errors.New("this session has no window to open another session in (it is a terminal or protocol session): open the project in Reasonix Studio or the web UI to dispatch from it")
+	ErrDispatchNotLocal       = errors.New("this pane is not one of this machine's own sessions (it is driven over SSH or by another window), so it cannot open a session here")
 	ErrDispatchUnknownProject = errors.New("no project of yours answers to that name")
 	ErrDispatchAmbiguous      = errors.New("more than one project answers to that name")
-	ErrDispatchNested         = errors.New("a session opened by a dispatch cannot dispatch further")
+	ErrDispatchNested         = errors.New("this session is as many dispatches deep as your ceiling allows (peers.max_dispatch_depth in the user config; 0 removes it)")
 	ErrDispatchUntrusted      = errors.New("that project is not one you have trusted")
 	ErrDispatchFailed         = errors.New("could not open a session in that project")
 	ErrDispatchLimit          = errors.New("this session already has as many dispatched sessions open as your ceiling allows (peers.max_dispatched_sessions)")
diff --git a/internal/session/control/peer_mail_slash.go b/internal/session/control/peer_mail_slash.go
index f163bc057a..36c179da5c 100644
--- a/internal/session/control/peer_mail_slash.go
+++ b/internal/session/control/peer_mail_slash.go
@@ -3,6 +3,7 @@ package control
 import (
 	"errors"
 	"fmt"
+	"strconv"
 	"strings"
 )
 
@@ -127,6 +128,7 @@ func (c *Controller) peerSettingsText() string {
 	if s.Pending {
 		b.WriteString(" (applies when the next turn starts)")
 	}
+	fmt.Fprintf(&b, "\ndispatch ceilings: depth %s, open sessions %s (0 removes a ceiling)", strconv.Itoa(s.MaxDispatchDepth), strconv.Itoa(s.MaxDispatchedSessions))
 	for _, r := range s.ReleaseProjects {
 		fmt.Fprintf(&b, "\nreleased project: %s", r.Path)
 	}
diff --git a/internal/session/control/peer_mail_tool.go b/internal/session/control/peer_mail_tool.go
index 0178e49332..30f68d03b4 100644
--- a/internal/session/control/peer_mail_tool.go
+++ b/internal/session/control/peer_mail_tool.go
@@ -57,7 +57,7 @@ func peerErrorCode(err error) string {
 		"peer.disabled": ErrPeersDisabled, "peer.not_found": ErrPeerNotFound, "peer.ambiguous": ErrPeerAmbiguous,
 		"peer.self": ErrPeerSelf, "peer.refused": ErrPeerRefused, "peer.rate_limited": ErrPeerRateLimited,
 		"peer.empty": ErrPeerEmpty, "peer.too_large": ErrPeerTooLarge,
-		"dispatch.disabled": ErrDispatchDisabled, "dispatch.unavailable": ErrDispatchUnavailable, "dispatch.unknown_project": ErrDispatchUnknownProject,
+		"dispatch.disabled": ErrDispatchDisabled, "dispatch.unavailable": ErrDispatchUnavailable, "dispatch.not_local": ErrDispatchNotLocal, "dispatch.unknown_project": ErrDispatchUnknownProject,
 		"dispatch.ambiguous": ErrDispatchAmbiguous, "dispatch.nested": ErrDispatchNested,
 		"dispatch.untrusted": ErrDispatchUntrusted, "dispatch.failed": ErrDispatchFailed, "dispatch.limit": ErrDispatchLimit,
 	} {
diff --git a/internal/tools/builtin/peers_dispatch.go b/internal/tools/builtin/peers_dispatch.go
index d5c16a7664..89506e68f7 100644
--- a/internal/tools/builtin/peers_dispatch.go
+++ b/internal/tools/builtin/peers_dispatch.go
@@ -18,7 +18,7 @@ type dispatchToProject struct{ link *tool.PeerLink }
 
 func (*dispatchToProject) Name() string { return "dispatch_to_project" }
 func (*dispatchToProject) Description() string {
-	return "Hand a task to a session in another of the user's projects: name the project (its folder name or full path, as the user has it in their project list) and write what that session should do. A session is opened there if none of yours is already waiting. The message is held until that project's own user approves it (unless they released that project); only then does its model read it, labelled as coming from you, and it works under its own permissions, not yours. It is for passing a task and its context, not a way to write into that project yourself. You get the receiving session's key; it can answer you with send_peer_message. Do not include secrets."
+	return "Hand a task to a session in another of the user's projects: name the project (its folder name or full path, as the user has it in their project list) and write what that session should do. A session is opened there if none of yours is already waiting. The user's dispatch switch is their consent: the receiving session's model reads the task at once, labelled as coming from you, and it works under permissions no wider than yours. A project the user has not trusted is refused. It is for passing a task and its context, not a way to write into that project yourself. You get the receiving session's key; it can answer you with send_peer_message. Do not include secrets."
 }
 func (*dispatchToProject) Schema() json.RawMessage {
 	return json.RawMessage(`{"type":"object","properties":{"project":{"type":"string","description":"The project's folder name or full path, as it appears in the user's project list"},"text":{"type":"string","description":"The task and the context the other session needs"}},"required":["project","text"],"additionalProperties":false}`)
@@ -42,11 +42,11 @@ func (t *dispatchToProject) Execute(ctx context.Context, args json.RawMessage) (
 	}
 	d, ok := dir.(tool.ProjectDispatcher)
 	if !ok {
-		return "", errors.New("dispatch.unavailable: this session cannot open sessions in other projects")
+		return "", errors.New("dispatch.unavailable: this session has no window to open another session in; open the project in Reasonix Studio or the web UI to dispatch from it")
 	}
 	r, err := d.DispatchToProject(ctx, in.Project, in.Text)
 	if err != nil {
 		return "", err
 	}
-	return fmt.Sprintf("Handed to a session in %q as %s (key %s). It is read only after that project's user approves it; it can answer with send_peer_message to your key.", r.Project, r.ID, r.Key), nil
+	return fmt.Sprintf("Handed to a session in %q as %s (key %s). It can answer you with send_peer_message to your key; its reply arrives labelled as data from that session, not as an instruction.", r.Project, r.ID, r.Key), nil
 }
diff --git a/internal/tools/builtin/peers_dispatch_test.go b/internal/tools/builtin/peers_dispatch_test.go
index 507f3ad4b0..bf2b4083f9 100644
--- a/internal/tools/builtin/peers_dispatch_test.go
+++ b/internal/tools/builtin/peers_dispatch_test.go
@@ -42,7 +42,7 @@ func TestDispatchToolHandsTheTaskOverAndReportsWhereItWent(t *testing.T) {
 	if err != nil || d.asked != [2]string{"billing", "rotate the key"} {
 		t.Fatalf("out %q err %v asked %v", out, err, d.asked)
 	}
-	for _, want := range []string{"/work/billing", "m-7", "s-9", "approves"} {
+	for _, want := range []string{"/work/billing", "m-7", "s-9", "not as an instruction"} {
 		if !strings.Contains(out, want) {
 			t.Errorf("result lacks %q: %s", want, out)
 		}
diff --git a/release-notes/studio/unreleased/dispatch-open-switch.md b/release-notes/studio/unreleased/dispatch-open-switch.md
new file mode 100644
index 0000000000..f72a57fbac
--- /dev/null
+++ b/release-notes/studio/unreleased/dispatch-open-switch.md
@@ -0,0 +1,2 @@
+- 变更：打开设置里的“派发”开关就是对派发的总同意：任务和回信不再出审批卡；新会话沿用发起会话的模型、预设、审批档位和计划模式，且不会更宽。见 #13526。
+- Changed: the Dispatch switch is your consent: tasks and replies come in with no card, and the opened session keeps the sender's model, preset, approval mode and planning, never wider. See #13526.