fix: keep enabled_tools reachable on a linked nested agent tool

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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

@@ -115,6 +115,9 @@
 		/** A linked agent's memory, once its config has loaded: whether it keeps managed memory decides
 		 *  which history inputs the step offers. */
 		linkedMemory?: { memory: unknown } | undefined
+		/** Set when this agent's config lives in a resource, so `tools` arrives with it rather than
+		 *  with the step. */
+		agentLinked?: boolean
 	}
 
 	let {
@@ -145,7 +148,8 @@
 		onAddTool = undefined,
 		onDeleteTool = undefined,
 		toolPickerPortal = undefined,
-		linkedMemory = undefined
+		linkedMemory = undefined,
+		agentLinked = false
 	}: Props = $props()
 
 	let ws = $derived(workspace ?? $workspaceStore)
@@ -226,9 +230,10 @@
 		})
 	})
 
-	// No editor adds tools to an agent used as a tool, so its Tools section only shows the ones
-	// written into the flow by hand, read-only.
-	let toolsHidden = $derived(isAgentTool && tools.length === 0)
+	// No editor adds tools to an agent used as a tool, so an empty roster is all an inline one will
+	// ever have. Not a linked one: its tools arrive with the resource, so empty here means "not
+	// loaded" as often as "none", and `enabled_tools` is the step's to set either way.
+	let toolsHidden = $derived(isAgentTool && !agentLinked && tools.length === 0)
 	let scopedFields = $derived(
 		AGENT_FIELDS.filter(
 			(spec) =>

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

@@ -199,6 +199,14 @@
 	let visibleSelected = $derived(selected === 'chat' && !canShowChatTab ? 'inputs' : selected)
 	let runSettings: FlowRunSettings | undefined = $state()
 	let agentLinked = $derived(flowModule.value.type === 'aiagent' && Boolean(flowModule.value.agent))
+	// A tool row drills in by selecting that tool's graph node, and the graph draws tool nodes only
+	// for a step's own agent (`computeAIToolNodes`). An agent used as a tool has none, so its rows
+	// would offer a click that lands nowhere.
+	let onSelectToolInGraph = $derived(
+		isAgentTool
+			? undefined
+			: (toolId: string) => selectionManager.selectId(toolId, { openPanel: true })
+	)
 	let validCode = $state(true)
 	let width = $state(1200)
 	let testJob: Job | undefined = $state(undefined)
@@ -1235,15 +1243,14 @@
 														workspace={opWs}
 														visibilityKey={agentFieldsKey}
 														linkedMemory={agentLinked ? linkedAgentMemory : undefined}
+														{agentLinked}
 														tools={agentLinked
 															? getLinkedAgentTools(
 																	linkedToolsScope(opWs, $pathStore),
 																	linkedToolsModuleId
 																)
 															: (flowModule.value.tools ?? [])}
-														onSelectTool={isAgentTool
-															? undefined
-															: (toolId) => selectionManager.selectId(toolId, { openPanel: true })}
+														onSelectTool={onSelectToolInGraph}
 														onAddTool={flowModuleSchemaMap
 															? (detail) =>
 																	flowModuleSchemaMap?.addToolToAgent(flowModule.id, detail)