fix: keep runnables out of the agents view and anchor a new agent once saved

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

frontend/src/lib/components/flows/agentDraft.svelte.ts

@@ -277,6 +277,11 @@ export function useAgentDraft(opts: AgentDraftOptions): AgentDraftHandle {
 					async ([r, user]) => {
 						// A slower response for a path we have left must not overwrite the current one.
 						if (loadedFor !== key) return
+						// The path was minted as free, so something already there is someone else's work.
+						if (opts.isNew?.()) {
+							refuse(`${path} already exists. Close this and create the agent again.`)
+							return
+						}
 						// A step's `agent` is caller-authored, so it can name a resource of any type, and a
 						// deploy from here would replace that resource's whole value while keeping its type.
 						const refused = agentEditorRefusal(path, r.resource_type)

frontend/src/lib/components/flows/content/AgentEditorModal.svelte

@@ -218,7 +218,9 @@
 		const at = deployingFor ?? currentWriteTarget()
 		// Before the rename is announced: it finds the steps to refresh under the old path.
 		const reconciled = reconcile(at, savedPath)
-		if (at && savedPath !== at.path) {
+		// A new agent's first deploy is announced like a rename even at the same path: the surface
+		// has anchored nothing for it yet, and reopening drops `isNew` now that it exists.
+		if (at && (savedPath !== at.path || target?.isNew)) {
 			onRenamed?.(at.path, savedPath)
 			// The dialog is keyed on the path, so this reloads it on the renamed agent. Only while it
 			// still shows the one deployed: it can be closed or pointed elsewhere mid-request.

frontend/src/lib/components/home/ItemsList.svelte

@@ -445,6 +445,8 @@
 		// nothing to append for agents.
 		if (reset) void loadAgents()
 		if (!showsRunnables) {
+			// Supersedes a page still in flight, which would otherwise land in the agent view.
+			++loadGen
 			scripts = []
 			flows = []
 			apps = []
@@ -628,6 +630,13 @@
 		// Track the prefix as open first — even a no-op call (re-expanding a cached node)
 		// means it's on screen, so later reloads must refresh it.
 		openOwners.add(owner)
+		// The agent view has no runnables to page in: its rows are the loaded agents, which
+		// `treeSource` adds itself. Rows an owner held from another kind go with the switch.
+		if (!showsRunnables) {
+			treeOwnerItems = treeOwnerItems.filter((x) => !effectivePath(x).startsWith(`${owner}/`))
+			ownerLoad[owner] = { hasMore: false, loading: false, loaded: true, gen: treeGen }
+			return
+		}
 		const st = ownerLoad[owner]
 		// Only a load for the CURRENT generation blocks a new one. A load left in flight
 		// by a superseded generation (treeGen bumped on a sort/filter reload) has already