Add flow settings, pulse emitting nodes, and simplify node state

- One dot per node now carries the whole story: primary while running, sage
  after a good run, red when anything is wrong, with the explanation on hover.
  The corner badge is gone, along with the second way of saying the same thing.
- A node that publishes something flashes a ring, so a running flow is legible
  without reading the edge values. Nodes that consume but publish nothing stay
  quiet, which is why the event carries an output count.
- Flow settings open in the same panel its nodes use, from a pencil in the
  dock: the title, the name, and deleting the flow. NodePanel and FlowPanel
  share the panel chrome rather than each drawing their own.
- Renaming is a server operation, because a flow's name is the namespace of its
  messages: the directory moves and every other flow reading `old.message` is
  repointed, instead of being left pointing at a flow that no longer exists.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016WzrvW7rjQbynnhF6pxh6i

backend/app/api/routes/flows.py

@@ -21,6 +21,7 @@ from app.flow.events import event_bus
 from app.flow.messages import qualify
 from app.flow.pipeline import ValidationIssue
 from app.flow.schemas import (
+    NAME_PATTERN,
     FlowDef,
     FlowsPublic,
     FlowStatePublic,
@@ -30,7 +31,7 @@ from app.flow.schemas import (
     NodeStatusPublic,
     NodeTypeInfo,
 )
-from app.flow.store import FlowNotFound
+from app.flow.store import FlowExists, FlowNotFound
 from app.models import Message
 
 router = APIRouter(
@@ -53,6 +54,10 @@ class ValidationResult(BaseModel):
     issues: list[ValidationIssue] = []
 
 
+class RenameRequest(BaseModel):
+    new_name: str
+
+
 class RunRequest(BaseModel):
     inputs: dict[str, Any] = {}
 
@@ -154,6 +159,33 @@ async def delete_flow(name: str, controller: FlowControllerDep) -> Any:
     return Message(message=f"Deleted flow '{name}'")
 
 
+@router.post("/{name}/rename", response_model=FlowDetail)
+async def rename_flow(
+    name: str,
+    body: RenameRequest,
+    controller: FlowControllerDep,
+) -> Any:
+    """Rename a flow, along with every reference to its messages."""
+    if not NAME_PATTERN.match(body.new_name):
+        raise HTTPException(
+            status_code=400,
+            detail=(
+                "Use lowercase letters, digits and underscores, starting with a letter"
+            ),
+        )
+    try:
+        renamed = await run_in_threadpool(
+            controller.store.rename_flow, name, body.new_name
+        )
+    except FlowNotFound:
+        raise HTTPException(status_code=404, detail=f"No flow named '{name}'")
+    except FlowExists as exc:
+        raise HTTPException(status_code=409, detail=str(exc))
+
+    await controller.reload()
+    return _detail(controller, renamed)
+
+
 # -----------------------------------------------------------------------------
 # Node source
 # -----------------------------------------------------------------------------

backend/app/flow/pipeline.py

@@ -338,6 +338,9 @@ class Pipeline:
                     "type": "node_executed",
                     "flow": node.flow,
                     "node": node.id,
+                    # A node that returns nothing ran but published nothing,
+                    # which is a different thing to show than one that emitted.
+                    "outputs": len(result or {}),
                     "duration_ms": round((time.perf_counter() - started) * 1000, 2),
                     "ts": time.time(),
                 }
@@ -443,6 +446,18 @@ class Pipeline:
                         "ts": ts,
                     }
                 )
+            # An injecting node — an MQTT subscriber, a webhook — publishes
+            # without going through the executor, but it did emit.
+            self._publish(
+                {
+                    "type": "node_executed",
+                    "flow": node.flow,
+                    "node": node.id,
+                    "outputs": len(outputs),
+                    "duration_ms": 0,
+                    "ts": ts,
+                }
+            )
 
         downstream = set(self._get_downstream(node))
         if not downstream:

backend/app/flow/store.py

@@ -34,6 +34,15 @@ class FlowNotFound(KeyError):
         return f"No flow named '{self.name}'"
 
 
+class FlowExists(ValueError):
+    def __init__(self, name: str) -> None:
+        super().__init__(name)
+        self.name = name
+
+    def __str__(self) -> str:
+        return f"There is already a flow named '{self.name}'"
+
+
 class FlowStore:
     """Reads and writes flows, committing every change."""
 
@@ -129,6 +138,50 @@ class FlowStore:
         shutil.rmtree(directory)
         self._commit(f"Delete flow '{name}'")
 
+    def rename_flow(self, name: str, new_name: str) -> FlowDef:
+        """Rename a flow, carrying its nodes and any references to it.
+
+        A flow's name is the namespace of its messages, so other flows reading
+        ``old.temperature`` are rewritten to read ``new.temperature`` — leaving
+        them pointing at a flow that no longer exists would break them silently.
+        """
+        if not self.exists(name):
+            raise FlowNotFound(name)
+        if self.exists(new_name):
+            raise FlowExists(new_name)
+
+        flow = self.read_flow(name)
+        self._flow_dir(name).rename(self._flow_dir(new_name))
+
+        renamed = flow.model_copy(update={"name": new_name})
+        self._flow_file(new_name).write_text(renamed.model_dump_json(indent=2) + "\n")
+
+        for other in self.read_all():
+            if other.name == new_name:
+                continue
+            if self._retarget(other, f"{name}.", f"{new_name}."):
+                self._flow_file(other.name).write_text(
+                    other.model_dump_json(indent=2) + "\n"
+                )
+
+        self._commit(f"Rename flow '{name}' to '{new_name}'")
+        return renamed
+
+    @staticmethod
+    def _retarget(flow: FlowDef, old_prefix: str, new_prefix: str) -> bool:
+        """Point this flow's cross-flow message names at a renamed flow."""
+        changed = False
+        for node in flow.nodes:
+            for specs in (node.requires, node.provides):
+                for position, spec in enumerate(specs):
+                    if spec.name.startswith(old_prefix):
+                        tail = spec.name[len(old_prefix) :]
+                        specs[position] = spec.model_copy(
+                            update={"name": new_prefix + tail}
+                        )
+                        changed = True
+        return changed
+
     # -------------------------------------------------------------------------
     # Node source
     # -------------------------------------------------------------------------

backend/tests/api/routes/test_flows.py

@@ -144,3 +144,65 @@ def test_node_types_are_listed(
     by_type = {entry["type"]: entry for entry in types}
     assert by_type["python"]["has_source"] is True
     assert "properties" in by_type["mqtt"]["params_schema"]
+
+
+def test_rename_flow(
+    client: TestClient, superuser_token_headers: dict[str, str]
+) -> None:
+    client.put(f"{PREFIX}/demo", headers=superuser_token_headers, json=a_flow())
+
+    response = client.post(
+        f"{PREFIX}/demo/rename",
+        headers=superuser_token_headers,
+        json={"new_name": "demo_renamed"},
+    )
+    assert response.status_code == 200
+    assert response.json()["definition"]["name"] == "demo_renamed"
+
+    assert (
+        client.get(f"{PREFIX}/demo", headers=superuser_token_headers).status_code == 404
+    )
+    assert (
+        client.get(
+            f"{PREFIX}/demo_renamed", headers=superuser_token_headers
+        ).status_code
+        == 200
+    )
+
+    # Put it back so the tests that follow find the flow they expect.
+    client.post(
+        f"{PREFIX}/demo_renamed/rename",
+        headers=superuser_token_headers,
+        json={"new_name": "demo"},
+    )
+
+
+def test_rename_onto_a_taken_name_is_refused(
+    client: TestClient, superuser_token_headers: dict[str, str]
+) -> None:
+    client.put(f"{PREFIX}/demo", headers=superuser_token_headers, json=a_flow())
+    client.put(
+        f"{PREFIX}/occupied", headers=superuser_token_headers, json=a_flow("occupied")
+    )
+
+    response = client.post(
+        f"{PREFIX}/demo/rename",
+        headers=superuser_token_headers,
+        json={"new_name": "occupied"},
+    )
+    assert response.status_code == 409
+
+    client.delete(f"{PREFIX}/occupied", headers=superuser_token_headers)
+
+
+def test_rename_rejects_an_invalid_name(
+    client: TestClient, superuser_token_headers: dict[str, str]
+) -> None:
+    client.put(f"{PREFIX}/demo", headers=superuser_token_headers, json=a_flow())
+
+    response = client.post(
+        f"{PREFIX}/demo/rename",
+        headers=superuser_token_headers,
+        json={"new_name": "Not A Flow Name"},
+    )
+    assert response.status_code == 400

backend/tests/flow/test_store.py

@@ -5,7 +5,7 @@ import pytest
 
 from app.flow.messages import MessageSpec
 from app.flow.schemas import FlowDef, NodeDef
-from app.flow.store import FlowNotFound, FlowStore
+from app.flow.store import FlowExists, FlowNotFound, FlowStore
 
 
 @pytest.fixture
@@ -73,3 +73,47 @@ def test_deleting_removes_flow_and_its_nodes(store: FlowStore):
 
     assert store.list_flows() == []
     assert not (store.root / "heating").exists()
+
+
+def test_renaming_a_flow_carries_its_nodes(store: FlowStore):
+    store.write_flow(a_flow())
+    store.write_node_source(
+        "heating", "sensor", "def process(params):\n    return {}\n"
+    )
+
+    renamed = store.rename_flow("heating", "warmth")
+
+    assert renamed.name == "warmth"
+    assert store.list_flows() == ["warmth"]
+    assert "def process" in store.read_node_source("warmth", "sensor")
+
+
+def test_renaming_a_flow_repoints_the_flows_reading_it(store: FlowStore):
+    store.write_flow(a_flow())
+    store.write_flow(
+        FlowDef(
+            name="display",
+            nodes=[
+                NodeDef(
+                    id="gauge",
+                    # Reads across the flow boundary, so the name must follow.
+                    requires=[MessageSpec(name="heating.temp")],
+                )
+            ],
+        )
+    )
+
+    store.rename_flow("heating", "warmth")
+
+    display = store.read_flow("display")
+    assert display.nodes[0].requires[0].name == "warmth.temp"
+
+
+def test_renaming_onto_an_existing_name_is_refused(store: FlowStore):
+    store.write_flow(a_flow())
+    store.write_flow(FlowDef(name="warmth"))
+
+    with pytest.raises(FlowExists):
+        store.rename_flow("heating", "warmth")
+
+    assert store.list_flows() == ["heating", "warmth"]

frontend/src/client/schemas.gen.ts

@@ -586,6 +586,18 @@ export const PrivateUserCreateSchema = {
     title: 'PrivateUserCreate'
 } as const;
 
+export const RenameRequestSchema = {
+    properties: {
+        new_name: {
+            type: 'string',
+            title: 'New Name'
+        }
+    },
+    type: 'object',
+    required: ['new_name'],
+    title: 'RenameRequest'
+} as const;
+
 export const RunRequestSchema = {
     properties: {
         inputs: {

frontend/src/client/sdk.gen.ts

@@ -3,7 +3,7 @@
 import type { CancelablePromise } from './core/CancelablePromise';
 import { OpenAPI } from './core/OpenAPI';
 import { request as __request } from './core/request';
-import type { FlowsReadFlowsResponse, FlowsReadNodeTypesResponse, FlowsReadFlowData, FlowsReadFlowResponse, FlowsSaveFlowData, FlowsSaveFlowResponse, FlowsDeleteFlowData, FlowsDeleteFlowResponse, FlowsReadNodeSourceData, FlowsReadNodeSourceResponse, FlowsSaveNodeSourceData, FlowsSaveNodeSourceResponse, FlowsValidateFlowData, FlowsValidateFlowResponse, FlowsRunFlowData, FlowsRunFlowResponse, FlowsTriggerNodeData, FlowsTriggerNodeResponse, FlowsReadFlowStateData, FlowsReadFlowStateResponse, LoginLoginAccessTokenData, LoginLoginAccessTokenResponse, LoginTestTokenResponse, LoginRecoverPasswordData, LoginRecoverPasswordResponse, LoginResetPasswordData, LoginResetPasswordResponse, LoginRecoverPasswordHtmlContentData, LoginRecoverPasswordHtmlContentResponse, PrivateCreateUserData, PrivateCreateUserResponse, SecretsReadSecretsResponse, SecretsSaveSecretData, SecretsSaveSecretResponse, SecretsDeleteSecretData, SecretsDeleteSecretResponse, UsersReadUsersData, UsersReadUsersResponse, UsersCreateUserData, UsersCreateUserResponse, UsersReadUserMeResponse, UsersDeleteUserMeResponse, UsersUpdateUserMeData, UsersUpdateUserMeResponse, UsersUpdatePasswordMeData, UsersUpdatePasswordMeResponse, UsersRegisterUserData, UsersRegisterUserResponse, UsersReadUserByIdData, UsersReadUserByIdResponse, UsersUpdateUserData, UsersUpdateUserResponse, UsersDeleteUserData, UsersDeleteUserResponse, UtilsTestEmailData, UtilsTestEmailResponse, UtilsHealthCheckResponse } from './types.gen';
+import type { FlowsReadFlowsResponse, FlowsReadNodeTypesResponse, FlowsReadFlowData, FlowsReadFlowResponse, FlowsSaveFlowData, FlowsSaveFlowResponse, FlowsDeleteFlowData, FlowsDeleteFlowResponse, FlowsRenameFlowData, FlowsRenameFlowResponse, FlowsReadNodeSourceData, FlowsReadNodeSourceResponse, FlowsSaveNodeSourceData, FlowsSaveNodeSourceResponse, FlowsValidateFlowData, FlowsValidateFlowResponse, FlowsRunFlowData, FlowsRunFlowResponse, FlowsTriggerNodeData, FlowsTriggerNodeResponse, FlowsReadFlowStateData, FlowsReadFlowStateResponse, LoginLoginAccessTokenData, LoginLoginAccessTokenResponse, LoginTestTokenResponse, LoginRecoverPasswordData, LoginRecoverPasswordResponse, LoginResetPasswordData, LoginResetPasswordResponse, LoginRecoverPasswordHtmlContentData, LoginRecoverPasswordHtmlContentResponse, PrivateCreateUserData, PrivateCreateUserResponse, SecretsReadSecretsResponse, SecretsSaveSecretData, SecretsSaveSecretResponse, SecretsDeleteSecretData, SecretsDeleteSecretResponse, UsersReadUsersData, UsersReadUsersResponse, UsersCreateUserData, UsersCreateUserResponse, UsersReadUserMeResponse, UsersDeleteUserMeResponse, UsersUpdateUserMeData, UsersUpdateUserMeResponse, UsersUpdatePasswordMeData, UsersUpdatePasswordMeResponse, UsersRegisterUserData, UsersRegisterUserResponse, UsersReadUserByIdData, UsersReadUserByIdResponse, UsersUpdateUserData, UsersUpdateUserResponse, UsersDeleteUserData, UsersDeleteUserResponse, UtilsTestEmailData, UtilsTestEmailResponse, UtilsHealthCheckResponse } from './types.gen';
 
 export class FlowsService {
     /**
@@ -98,6 +98,30 @@ export class FlowsService {
         });
     }
     
+    /**
+     * Rename Flow
+     * Rename a flow, along with every reference to its messages.
+     * @param data The data for the request.
+     * @param data.name
+     * @param data.requestBody
+     * @returns FlowDetail Successful Response
+     * @throws ApiError
+     */
+    public static renameFlow(data: FlowsRenameFlowData): CancelablePromise<FlowsRenameFlowResponse> {
+        return __request(OpenAPI, {
+            method: 'POST',
+            url: '/api/v1/flows/{name}/rename',
+            path: {
+                name: data.name
+            },
+            body: data.requestBody,
+            mediaType: 'application/json',
+            errors: {
+                422: 'Validation Error'
+            }
+        });
+    }
+    
     /**
      * Read Node Source
      * Read a node's Python source.

frontend/src/client/types.gen.ts

@@ -193,6 +193,10 @@ export type PrivateUserCreate = {
     is_verified?: boolean;
 };
 
+export type RenameRequest = {
+    new_name: string;
+};
+
 export type RunRequest = {
     inputs?: {
         [key: string]: unknown;
@@ -313,6 +317,13 @@ export type FlowsDeleteFlowData = {
 
 export type FlowsDeleteFlowResponse = (Message);
 
+export type FlowsRenameFlowData = {
+    name: string;
+    requestBody: RenameRequest;
+};
+
+export type FlowsRenameFlowResponse = (FlowDetail);
+
 export type FlowsReadNodeSourceData = {
     name: string;
     nodeId: string;

frontend/src/components/Flow/FlowDock.tsx

@@ -3,6 +3,7 @@ import {
   AlertCircle,
   Loader2,
   Maximize2,
+  Pencil,
   Play,
   Plus,
   ZoomIn,
@@ -33,12 +34,14 @@ export function FlowDock({
   issues,
   running,
   onAddNode,
+  onEditFlow,
   onRun,
   onFocusNode,
 }: {
   issues: ValidationIssue[]
   running: boolean
   onAddNode: () => void
+  onEditFlow: () => void
   onRun: () => void
   onFocusNode: (nodeId: string) => void
 }) {
@@ -68,6 +71,22 @@ export function FlowDock({
         <TooltipContent>Add a node (⌘K)</TooltipContent>
       </Tooltip>
 
+      <Tooltip>
+        <TooltipTrigger asChild>
+          <Button
+            variant="ghost"
+            size="icon"
+            className="size-11 text-muted-foreground md:size-8"
+            onClick={onEditFlow}
+            aria-label="Flow settings"
+            data-testid="edit-flow"
+          >
+            <Pencil />
+          </Button>
+        </TooltipTrigger>
+        <TooltipContent>Flow settings</TooltipContent>
+      </Tooltip>
+
       <Separator orientation="vertical" className="mx-0.5 !h-5" />
 
       <Button

frontend/src/components/Flow/FlowEditor.tsx

@@ -41,12 +41,14 @@ import { bindingsKey, deriveEdges, portOf, qualify } from "./deriveEdges"
 import { EdgeInspector, type InspectedEdge } from "./EdgeInspector"
 import { FlowDock } from "./FlowDock"
 import { FlowNode, type FlowNodeData } from "./FlowNode"
+import { FlowPanel } from "./FlowPanel"
 import { FlowTabs } from "./FlowTabs"
 import { LiveEdge } from "./LiveEdge"
 import { NodePanel } from "./NodePanel"
 import "./flow.css"
 import { liveStore } from "./liveStore"
 import {
+  flowKeys,
   flowQueryOptions,
   flowsQueryOptions,
   nodeTypesQueryOptions,
@@ -96,6 +98,7 @@ function uniqueNodeId(existing: NodeDef_Input[], type: string): string {
 }
 
 function FlowEditorInner({ flowName }: { flowName: string }) {
+  const navigate = useNavigate()
   const queryClient = useQueryClient()
   const { showErrorToast } = useCustomToast()
   const { screenToFlowPosition, fitView } = useReactFlow()
@@ -117,6 +120,7 @@ function FlowEditorInner({ flowName }: { flowName: string }) {
   const [paletteOpen, setPaletteOpen] = useState(false)
   const [inspected, setInspected] = useState<InspectedEdge | null>(null)
   const [rebind, setRebind] = useState<Rebind | null>(null)
+  const [flowPanelOpen, setFlowPanelOpen] = useState(false)
 
   const issues = detail.issues ?? []
 
@@ -228,6 +232,32 @@ function FlowEditorInner({ flowName }: { flowName: string }) {
       showErrorToast("The flow could not run. Check the node errors."),
   })
 
+  const renameMutation = useMutation({
+    mutationFn: (newName: string) =>
+      FlowsService.renameFlow({ name: flowName, requestBody: { new_name: newName } }),
+    onSuccess: (detail) => {
+      queryClient.invalidateQueries({ queryKey: flowKeys.all })
+      setFlowPanelOpen(false)
+      navigate({
+        to: "/flows/$flowName",
+        params: { flowName: detail.definition.name },
+        replace: true,
+      })
+    },
+    onError: () =>
+      showErrorToast("That name is taken, or is not a valid flow name."),
+  })
+
+  const deleteMutation = useMutation({
+    mutationFn: () => FlowsService.deleteFlow({ name: flowName }),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: flowKeys.all })
+      setFlowPanelOpen(false)
+      navigate({ to: "/flows", replace: true })
+    },
+    onError: () => showErrorToast("The flow could not be deleted."),
+  })
+
   const sourceMutation = useMutation({
     mutationFn: ({ nodeId, code }: { nodeId: string; code: string }) =>
       FlowsService.saveNodeSource({
@@ -406,7 +436,10 @@ function FlowEditorInner({ flowName }: { flowName: string }) {
           commit(definitions, mergeDragged(canvasNodes, dragged))
         }
         onNodesDelete={(deleted) => deleteNodes(deleted.map((node) => node.id))}
-        onNodeClick={(_event, node) => setSelectedId(node.id)}
+        onNodeClick={(_event, node) => {
+          setFlowPanelOpen(false)
+          setSelectedId(node.id)
+        }}
         onPaneClick={() => {
           setSelectedId(null)
           setInspected(null)
@@ -453,6 +486,10 @@ function FlowEditorInner({ flowName }: { flowName: string }) {
         issues={issues}
         running={runMutation.isPending}
         onAddNode={() => setPaletteOpen(true)}
+        onEditFlow={() => {
+          setSelectedId(null)
+          setFlowPanelOpen(true)
+        }}
         onRun={() => {
           flush()
           runMutation.mutate()
@@ -475,6 +512,23 @@ function FlowEditorInner({ flowName }: { flowName: string }) {
         </div>
       ) : null}
 
+      <FlowPanel
+        open={flowPanelOpen && !selected}
+        definition={{ ...detail.definition, nodes: definitions }}
+        nodeCount={definitions.length}
+        renaming={renameMutation.isPending}
+        onChange={(next) => {
+          flush()
+          save({ ...next, nodes: definitions })
+        }}
+        onRename={(newName) => {
+          flush()
+          renameMutation.mutate(newName)
+        }}
+        onDelete={() => deleteMutation.mutate()}
+        onClose={() => setFlowPanelOpen(false)}
+      />
+
       <NodePanel
         node={selected}
         flow={flowName}

frontend/src/components/Flow/FlowNode.tsx

@@ -1,13 +1,5 @@
 import { Handle, type NodeProps, Position } from "@xyflow/react"
-import {
-  AlertCircle,
-  Braces,
-  Clock,
-  Code2,
-  Database,
-  Globe,
-  Radio,
-} from "lucide-react"
+import { Braces, Clock, Code2, Database, Globe, Radio } from "lucide-react"
 import { memo } from "react"
 
 import type { MessageSpec, NodeDef_Input } from "@/client"
@@ -18,7 +10,7 @@ import {
 } from "@/components/ui/tooltip"
 import { cn } from "@/lib/utils"
 import { portOf } from "./deriveEdges"
-import { useNodeStatus } from "./liveStore"
+import { useNodeEmits, useNodeStatus } from "./liveStore"
 
 const NODE_ICONS = {
   python: Code2,
@@ -29,11 +21,12 @@ const NODE_ICONS = {
   mlp: Braces,
 } as const
 
-// Only the states worth a quiet marker. Anything wrong goes to the badge
-// instead, so a problem is never reported twice on the same node.
+// One dot says everything about a node's state. Idle nodes carry no dot at all,
+// so the canvas stays quiet until something happens.
 const STATUS_STYLES = {
   running: { dot: "bg-primary animate-pulse", label: "Running" },
   success: { dot: "bg-status-success", label: "Last run succeeded" },
+  error: { dot: "bg-destructive", label: "Something went wrong" },
 } as const
 
 export type FlowNodeData = {
@@ -85,16 +78,16 @@ function PortHandles({
 function FlowNodeComponent({ data, selected }: NodeProps) {
   const { definition, flow, typeLabel, issueText } = data as FlowNodeData
   const live = useNodeStatus(`${flow}.${definition.id}`)
+  const emits = useNodeEmits(`${flow}.${definition.id}`)
   const Icon = NODE_ICONS[definition.type as keyof typeof NODE_ICONS] ?? Code2
 
   // Whatever is wrong — it failed to load, it failed to run, or the graph
-  // around it does not add up — is one badge with one explanation.
+  // around it does not add up — is the same red dot with the same explanation.
   const problem = [live?.status === "error" ? live.error : null, issueText]
     .filter(Boolean)
     .join("\n")
-  const style = problem
-    ? undefined
-    : STATUS_STYLES[live?.status as keyof typeof STATUS_STYLES]
+  const status = problem ? "error" : live?.status
+  const style = STATUS_STYLES[status as keyof typeof STATUS_STYLES]
 
   return (
     <div
@@ -103,6 +96,9 @@ function FlowNodeComponent({ data, selected }: NodeProps) {
         selected && "border-primary shadow-e2",
       )}
     >
+      {/* Remounting on each emit is what restarts the animation. */}
+      {emits > 0 ? <span key={emits} className="node-pulse" /> : null}
+
       <PortHandles
         specs={definition.requires ?? []}
         type="target"
@@ -130,28 +126,13 @@ function FlowNodeComponent({ data, selected }: NodeProps) {
                 aria-label={style.label}
               />
             </TooltipTrigger>
-            <TooltipContent>{live?.error ?? style.label}</TooltipContent>
+            <TooltipContent className="max-w-xs whitespace-pre-line">
+              {problem || style.label}
+            </TooltipContent>
           </Tooltip>
         ) : null}
       </div>
 
-      {problem ? (
-        <Tooltip>
-          <TooltipTrigger asChild>
-            <span
-              role="img"
-              aria-label="This node has a problem"
-              className="absolute -right-1.5 -top-1.5 flex size-4 items-center justify-center rounded-full bg-destructive text-primary-foreground"
-            >
-              <AlertCircle className="size-3" />
-            </span>
-          </TooltipTrigger>
-          <TooltipContent className="max-w-xs whitespace-pre-line">
-            {problem}
-          </TooltipContent>
-        </Tooltip>
-      ) : null}
-
       <PortHandles
         specs={definition.provides ?? []}
         type="source"

frontend/src/components/Flow/FlowPanel.tsx

@@ -0,0 +1,154 @@
+import { useState } from "react"
+
+import type { FlowDef_Input } from "@/client"
+import { Button } from "@/components/ui/button"
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+} from "@/components/ui/dialog"
+import { Input } from "@/components/ui/input"
+import { PANEL_SECTION, SidePanel } from "./SidePanel"
+
+const NAME_PATTERN = /^[a-z][a-z0-9_]*$/
+
+/**
+ * The flow's own settings, in the same panel its nodes use.
+ *
+ * The name is also the namespace of every message in the flow, which is why
+ * renaming goes through the server rather than being another autosaved field.
+ */
+export function FlowPanel({
+  open,
+  definition,
+  nodeCount,
+  renaming,
+  onChange,
+  onRename,
+  onDelete,
+  onClose,
+}: {
+  open: boolean
+  definition: FlowDef_Input
+  nodeCount: number
+  renaming: boolean
+  onChange: (next: FlowDef_Input) => void
+  onRename: (newName: string) => void
+  onDelete: () => void
+  onClose: () => void
+}) {
+  const [name, setName] = useState(definition.name)
+  const [confirmOpen, setConfirmOpen] = useState(false)
+
+  const valid = NAME_PATTERN.test(name)
+  const changed = name !== definition.name
+
+  return (
+    <>
+      <SidePanel
+        open={open}
+        label="Flow settings"
+        testId="flow-panel"
+        bodyKey={definition.name}
+        onClose={onClose}
+        header={
+          <Input
+            value={definition.title ?? ""}
+            placeholder={definition.name}
+            aria-label="Flow title"
+            className="h-8 flex-1 text-sm font-medium"
+            onChange={(event) =>
+              onChange({ ...definition, title: event.target.value })
+            }
+          />
+        }
+        footer={
+          <Button
+            variant="ghost"
+            size="sm"
+            className="text-destructive hover:text-destructive"
+            onClick={() => setConfirmOpen(true)}
+            data-testid="delete-flow"
+          >
+            Delete flow
+          </Button>
+        }
+      >
+        <div className="grid gap-5 p-4">
+          <div className="grid gap-2">
+            <span className={PANEL_SECTION}>Name</span>
+            <div className="flex items-center gap-1.5">
+              <Input
+                value={name}
+                aria-label="Flow name"
+                autoComplete="off"
+                className="h-8 flex-1 font-mono text-sm"
+                onChange={(event) => setName(event.target.value)}
+                onKeyDown={(event) => {
+                  if (event.key === "Enter" && valid && changed) {
+                    onRename(name)
+                  }
+                }}
+              />
+              <Button
+                size="sm"
+                className="h-8"
+                disabled={!valid || !changed || renaming}
+                onClick={() => onRename(name)}
+              >
+                {renaming ? "Renaming…" : "Rename"}
+              </Button>
+            </div>
+            <p className="text-sm text-muted-foreground">
+              {valid || !name
+                ? "Messages in this flow are named after it, so other flows reading them follow the rename."
+                : "Lowercase letters, digits and underscores, starting with a letter."}
+            </p>
+          </div>
+
+          <div className="grid gap-2">
+            <span className={PANEL_SECTION}>Contents</span>
+            <p className="text-sm text-muted-foreground">
+              {nodeCount === 0
+                ? "No nodes yet."
+                : `${nodeCount} node${nodeCount === 1 ? "" : "s"}.`}
+            </p>
+          </div>
+        </div>
+      </SidePanel>
+
+      <Dialog open={confirmOpen} onOpenChange={setConfirmOpen}>
+        <DialogContent>
+          <DialogHeader>
+            <DialogTitle>
+              Delete {definition.title || definition.name}?
+            </DialogTitle>
+            <DialogDescription>
+              This removes the flow and the code of its{" "}
+              {nodeCount === 1 ? "node" : `${nodeCount} nodes`}. Its history
+              stays in the flow store's git repository.
+            </DialogDescription>
+          </DialogHeader>
+          <DialogFooter>
+            <Button variant="outline" onClick={() => setConfirmOpen(false)}>
+              Keep it
+            </Button>
+            <Button
+              variant="destructive"
+              onClick={() => {
+                setConfirmOpen(false)
+                onDelete()
+              }}
+              data-testid="confirm-delete-flow"
+            >
+              Delete flow
+            </Button>
+          </DialogFooter>
+        </DialogContent>
+      </Dialog>
+    </>
+  )
+}

frontend/src/components/Flow/NodePanel.tsx

@@ -1,6 +1,5 @@
 import { useQuery } from "@tanstack/react-query"
 import { X } from "lucide-react"
-import { AnimatePresence, motion } from "motion/react"
 import { lazy, Suspense, useEffect, useRef, useState } from "react"
 
 import type { DType, MessageSpec, NodeDef_Input, NodeTypeInfo } from "@/client"
@@ -22,33 +21,15 @@ import {
   SelectTrigger,
   SelectValue,
 } from "@/components/ui/select"
-import { Sheet, SheetContent, SheetTitle } from "@/components/ui/sheet"
 import { Switch } from "@/components/ui/switch"
-import { useIsMobile } from "@/hooks/useMobile"
-import { duration, easeEmphasized, easeStandard } from "@/lib/motion"
 import { nodeSourceQueryOptions } from "./queries"
+import { PANEL_SECTION, SidePanel } from "./SidePanel"
 
 const NodeEditor = lazy(() => import("./NodeEditor"))
 
 const DTYPES: DType[] = ["float", "int", "str", "bool", "json"]
 
-const SECTION =
-  "text-xs font-medium uppercase tracking-[0.5px] text-muted-foreground"
-
-/** Same grammar as the shared `slideUp`, on the axis this panel travels. */
-const panelSlide = {
-  hidden: { opacity: 0, x: 16 },
-  visible: {
-    opacity: 1,
-    x: 0,
-    transition: { duration: duration.base, ease: easeEmphasized },
-  },
-  exit: {
-    opacity: 0,
-    x: 16,
-    transition: { duration: duration.fast, ease: easeStandard },
-  },
-}
+const SECTION = PANEL_SECTION
 
 /**
  * A message name, typed freely or picked from the names already in play.
@@ -297,8 +278,6 @@ function PanelBody({
   suggestions,
   onChange,
   onSaveSource,
-  onClose,
-  onDelete,
 }: {
   node: NodeDef_Input
   flow: string
@@ -306,8 +285,6 @@ function PanelBody({
   suggestions: PortSuggestions
   onChange: (next: NodeDef_Input) => void
   onSaveSource: (code: string) => void
-  onClose: () => void
-  onDelete: () => void
 }) {
   const hasSource = nodeType?.has_source ?? node.type === "python"
   const { data: source } = useQuery({
@@ -343,78 +320,47 @@ function PanelBody({
 
   return (
     <>
-      <div className="flex shrink-0 items-center gap-2 border-b border-border px-4 py-3">
-        <Input
-          value={node.title || node.id}
-          aria-label="Node name"
-          className="h-8 flex-1 text-sm font-medium"
-          onChange={(event) => onChange({ ...node, title: event.target.value })}
+      <div className="grid gap-5 p-4">
+        <PortList
+          title="Consumes"
+          specs={node.requires ?? []}
+          flow={flow}
+          emptyHint="Nothing yet. Add a message this node reads."
+          suggestions={suggestions.consumes}
+          onChange={(requires) => onChange({ ...node, requires })}
+        />
+        <PortList
+          title="Provides"
+          specs={node.provides ?? []}
+          flow={flow}
+          emptyHint="Nothing yet. Add a message this node publishes."
+          suggestions={suggestions.provides}
+          onChange={(provides) => onChange({ ...node, provides })}
+        />
+        <ParamsForm
+          schema={nodeType?.params_schema}
+          params={node.params ?? {}}
+          onChange={(params) => onChange({ ...node, params })}
         />
-        <Button
-          variant="ghost"
-          size="icon-sm"
-          className="text-muted-foreground"
-          onClick={onClose}
-          aria-label="Close"
-        >
-          <X />
-        </Button>
       </div>
 
-      <div className="flex min-h-0 flex-1 flex-col overflow-y-auto">
-        <div className="grid gap-5 p-4">
-          <PortList
-            title="Consumes"
-            specs={node.requires ?? []}
-            flow={flow}
-            emptyHint="Nothing yet. Add a message this node reads."
-            suggestions={suggestions.consumes}
-            onChange={(requires) => onChange({ ...node, requires })}
-          />
-          <PortList
-            title="Provides"
-            specs={node.provides ?? []}
-            flow={flow}
-            emptyHint="Nothing yet. Add a message this node publishes."
-            suggestions={suggestions.provides}
-            onChange={(provides) => onChange({ ...node, provides })}
-          />
-          <ParamsForm
-            schema={nodeType?.params_schema}
-            params={node.params ?? {}}
-            onChange={(params) => onChange({ ...node, params })}
-          />
-        </div>
-
-        {hasSource ? (
-          <div className="flex min-h-[280px] flex-1 flex-col gap-2 px-4 pb-4">
-            <span className={SECTION}>Code</span>
-            <div className="min-h-0 flex-1 overflow-hidden rounded-md border border-border">
-              <Suspense
-                fallback={
-                  <div className="h-full w-full animate-pulse bg-muted" />
-                }
-              >
-                <NodeEditor
-                  value={code ?? source?.code ?? ""}
-                  onChange={editCode}
-                />
-              </Suspense>
-            </div>
+      {hasSource ? (
+        <div className="flex min-h-[280px] flex-1 flex-col gap-2 px-4 pb-4">
+          <span className={SECTION}>Code</span>
+          <div className="min-h-0 flex-1 overflow-hidden rounded-md border border-border">
+            <Suspense
+              fallback={
+                <div className="h-full w-full animate-pulse bg-muted" />
+              }
+            >
+              <NodeEditor
+                value={code ?? source?.code ?? ""}
+                onChange={editCode}
+              />
+            </Suspense>
           </div>
-        ) : null}
-      </div>
-
-      <div className="shrink-0 border-t border-border px-4 py-3">
-        <Button
-          variant="ghost"
-          size="sm"
-          className="text-destructive hover:text-destructive"
-          onClick={onDelete}
-        >
-          Delete node
-        </Button>
-      </div>
+        </div>
+      ) : null}
     </>
   )
 }
@@ -445,73 +391,48 @@ export function NodePanel({
   onClose: () => void
   onDelete: () => void
 }) {
-  const isMobile = useIsMobile()
   const nodeType = nodeTypes.find((entry) => entry.type === node?.type)
 
-  useEffect(() => {
-    if (!node) return
-    const onKey = (event: KeyboardEvent) => {
-      if (event.key === "Escape") onClose()
-    }
-    window.addEventListener("keydown", onKey)
-    return () => window.removeEventListener("keydown", onKey)
-  }, [node, onClose])
-
-  if (isMobile) {
-    return (
-      <Sheet open={Boolean(node)} onOpenChange={(open) => !open && onClose()}>
-        <SheetContent
-          side="right"
-          // The panel header carries its own close button, and opening should
-          // not drop the caret into the node's name.
-          className="flex h-dvh w-full max-w-none flex-col gap-0 rounded-none p-0 [&>button:last-of-type]:hidden"
-          onOpenAutoFocus={(event) => event.preventDefault()}
-        >
-          <SheetTitle className="sr-only">Node settings</SheetTitle>
-          {node ? (
-            <PanelBody
-              key={node.id}
-              node={node}
-              flow={flow}
-              nodeType={nodeType}
-              suggestions={suggestions}
-              onChange={onChange}
-              onSaveSource={onSaveSource}
-              onClose={onClose}
-              onDelete={onDelete}
-            />
-          ) : null}
-        </SheetContent>
-      </Sheet>
-    )
-  }
-
   return (
-    <AnimatePresence>
-      {node ? (
-        <motion.aside
-          key={node.id}
-          variants={panelSlide}
-          initial="hidden"
-          animate="visible"
-          exit="exit"
-          role="complementary"
-          aria-label="Node settings"
-          data-testid="node-panel"
-          className="pointer-events-auto absolute inset-y-4 right-4 z-10 flex w-[400px] flex-col overflow-hidden rounded-lg border border-border bg-card/80 shadow-e2 backdrop-blur-md"
-        >
-          <PanelBody
-            node={node}
-            flow={flow}
-            nodeType={nodeType}
-            suggestions={suggestions}
-            onChange={onChange}
-            onSaveSource={onSaveSource}
-            onClose={onClose}
-            onDelete={onDelete}
+    <SidePanel
+      open={Boolean(node)}
+      label="Node settings"
+      testId="node-panel"
+      bodyKey={node?.id ?? "none"}
+      onClose={onClose}
+      header={
+        node ? (
+          <Input
+            value={node.title || node.id}
+            aria-label="Node name"
+            className="h-8 flex-1 text-sm font-medium"
+            onChange={(event) =>
+              onChange({ ...node, title: event.target.value })
+            }
           />
-        </motion.aside>
+        ) : null
+      }
+      footer={
+        <Button
+          variant="ghost"
+          size="sm"
+          className="text-destructive hover:text-destructive"
+          onClick={onDelete}
+        >
+          Delete node
+        </Button>
+      }
+    >
+      {node ? (
+        <PanelBody
+          node={node}
+          flow={flow}
+          nodeType={nodeType}
+          suggestions={suggestions}
+          onChange={onChange}
+          onSaveSource={onSaveSource}
+        />
       ) : null}
-    </AnimatePresence>
+    </SidePanel>
   )
 }

frontend/src/components/Flow/SidePanel.tsx

@@ -0,0 +1,135 @@
+import { X } from "lucide-react"
+import { AnimatePresence, motion } from "motion/react"
+import type { ReactNode } from "react"
+import { useEffect } from "react"
+
+import { Button } from "@/components/ui/button"
+import { Sheet, SheetContent, SheetTitle } from "@/components/ui/sheet"
+import { useIsMobile } from "@/hooks/useMobile"
+import { duration, easeEmphasized, easeStandard } from "@/lib/motion"
+
+/** Same grammar as the shared `slideUp`, on the axis this panel travels. */
+const panelSlide = {
+  hidden: { opacity: 0, x: 16 },
+  visible: {
+    opacity: 1,
+    x: 0,
+    transition: { duration: duration.base, ease: easeEmphasized },
+  },
+  exit: {
+    opacity: 0,
+    x: 16,
+    transition: { duration: duration.fast, ease: easeStandard },
+  },
+}
+
+export const PANEL_SECTION =
+  "text-xs font-medium uppercase tracking-[0.5px] text-muted-foreground"
+
+/**
+ * The editor's settings panel: floating over the canvas so the graph stays
+ * visible and running behind it, a full-screen sheet where there is no room
+ * for that.
+ *
+ * Node settings and flow settings share it, so the two read as one surface.
+ */
+export function SidePanel({
+  open,
+  label,
+  testId,
+  bodyKey,
+  header,
+  footer,
+  children,
+  onClose,
+}: {
+  open: boolean
+  /** Names the panel for screen readers. */
+  label: string
+  testId: string
+  /** Remounts the contents when the thing being edited changes. */
+  bodyKey: string
+  header: ReactNode
+  footer?: ReactNode
+  children: ReactNode
+  onClose: () => void
+}) {
+  const isMobile = useIsMobile()
+
+  useEffect(() => {
+    if (!open) return
+    const onKey = (event: KeyboardEvent) => {
+      if (event.key === "Escape") onClose()
+    }
+    window.addEventListener("keydown", onKey)
+    return () => window.removeEventListener("keydown", onKey)
+  }, [open, onClose])
+
+  const contents = (
+    <>
+      <div className="flex shrink-0 items-center gap-2 border-b border-border px-4 py-3">
+        {header}
+        <Button
+          variant="ghost"
+          size="icon-sm"
+          className="shrink-0 text-muted-foreground"
+          onClick={onClose}
+          aria-label="Close"
+        >
+          <X />
+        </Button>
+      </div>
+
+      <div className="flex min-h-0 flex-1 flex-col overflow-y-auto">
+        {children}
+      </div>
+
+      {footer ? (
+        <div className="shrink-0 border-t border-border px-4 py-3">
+          {footer}
+        </div>
+      ) : null}
+    </>
+  )
+
+  if (isMobile) {
+    return (
+      <Sheet open={open} onOpenChange={(next) => !next && onClose()}>
+        <SheetContent
+          side="right"
+          // The panel header carries its own close button, and opening should
+          // not drop the caret into the first field.
+          className="flex h-dvh w-full max-w-none flex-col gap-0 rounded-none p-0 [&>button:last-of-type]:hidden"
+          onOpenAutoFocus={(event) => event.preventDefault()}
+        >
+          <SheetTitle className="sr-only">{label}</SheetTitle>
+          {open ? (
+            <div key={bodyKey} className="contents">
+              {contents}
+            </div>
+          ) : null}
+        </SheetContent>
+      </Sheet>
+    )
+  }
+
+  return (
+    <AnimatePresence>
+      {open ? (
+        <motion.aside
+          key={bodyKey}
+          variants={panelSlide}
+          initial="hidden"
+          animate="visible"
+          exit="exit"
+          role="complementary"
+          aria-label={label}
+          data-testid={testId}
+          className="pointer-events-auto absolute inset-y-4 right-4 z-10 flex w-[400px] flex-col overflow-hidden rounded-lg border border-border bg-card/80 shadow-e2 backdrop-blur-md"
+        >
+          {contents}
+        </motion.aside>
+      ) : null}
+    </AnimatePresence>
+  )
+}

frontend/src/components/Flow/flow.css

@@ -49,6 +49,30 @@
   }
 }
 
+/* A node that just published something says so, once, and settles. */
+@media (prefers-reduced-motion: no-preference) {
+  .node-pulse {
+    position: absolute;
+    inset: -3px;
+    border-radius: inherit;
+    border: 2px solid var(--primary);
+    box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 18%, transparent);
+    pointer-events: none;
+    animation: node-pulse var(--duration-slow) var(--ease-emphasized) forwards;
+  }
+
+  @keyframes node-pulse {
+    from {
+      opacity: 1;
+      transform: scale(1);
+    }
+    to {
+      opacity: 0;
+      transform: scale(1.09);
+    }
+  }
+}
+
 /* Handles are neutral: the one brand-secondary affordance here is Run. */
 .react-flow__handle {
   width: 12px;

frontend/src/components/Flow/liveStore.ts

@@ -18,6 +18,9 @@ type Listener = () => void
 
 const values = new Map<string, LiveValue>()
 const statuses = new Map<string, LiveStatus>()
+// How many times a node has emitted. The number itself means nothing; a change
+// is what restarts the pulse.
+const emits = new Map<string, number>()
 const listeners = new Map<string, Set<Listener>>()
 
 let connected = false
@@ -72,6 +75,10 @@ export const liveStore = {
   getStatus(nodeId: string) {
     return statuses.get(nodeId)
   },
+  recordEmit(nodeId: string) {
+    emits.set(nodeId, (emits.get(nodeId) ?? 0) + 1)
+    notify(`emit:${nodeId}`)
+  },
   setConnected(next: boolean) {
     if (connected === next) return
     connected = next
@@ -85,6 +92,8 @@ export const liveStore = {
     values.clear()
     for (const key of statuses.keys()) notify(`status:${key}`)
     statuses.clear()
+    for (const key of emits.keys()) notify(`emit:${key}`)
+    emits.clear()
   },
 }
 
@@ -102,6 +111,14 @@ export function useNodeStatus(nodeId: string): LiveStatus | undefined {
   )
 }
 
+/** Increments each time the node publishes something. */
+export function useNodeEmits(nodeId: string): number {
+  return useSyncExternalStore(
+    (listener) => subscribeKey(`emit:${nodeId}`, listener),
+    () => emits.get(nodeId) ?? 0,
+  )
+}
+
 export function useLiveConnection(): boolean {
   return useSyncExternalStore(
     (listener) => {

frontend/src/components/Flow/useFlowSocket.ts

@@ -13,7 +13,7 @@ type FlowEvent =
       nodes: { id: string; status: string; error?: string | null }[]
     }
   | { type: "message_value"; name: string; value: unknown; ts: number }
-  | { type: "node_executed"; node: string }
+  | { type: "node_executed"; node: string; outputs: number }
   | { type: "node_error"; node: string; error: string }
   | { type: "node_status"; node: string; status: string; error?: string | null }
   | {
@@ -71,6 +71,7 @@ export function useFlowSocket(onAuthFailure?: () => void): void {
             break
           case "node_executed":
             liveStore.setStatus(message.node, { status: "success" })
+            if (message.outputs > 0) liveStore.recordEmit(message.node)
             break
           case "node_error":
             liveStore.setStatus(message.node, {

frontend/src/index.css

@@ -35,8 +35,8 @@
   --ease-emphasized: cubic-bezier(0.2, 0, 0, 1);
   --ease-standard: cubic-bezier(0.4, 0, 0.2, 1);
   --duration-fast: 150ms;
-  --duration-base: 200ms;
-  --duration-slow: 300ms;
+  --duration-base: 250ms;
+  --duration-slow: 500ms;
   --color-background: var(--background);
   --color-foreground: var(--foreground);
   --color-card: var(--card);