diff --git a/frontend/src/lib/components/FlowBuilder.svelte b/frontend/src/lib/components/FlowBuilder.svelte
index 7f3e96de0d..57cd8b2953 100644
--- a/frontend/src/lib/components/FlowBuilder.svelte
+++ b/frontend/src/lib/components/FlowBuilder.svelte
@@ -1582,7 +1582,13 @@
 						kind: 'flow',
 						path: pathSnapshot ?? $pathStore,
 						summaryContent: flowSummary,
-						pathTrigger: flowPathTrigger
+						// Gated like the summary's own editor: a host that allows neither field keeps the
+						// band's segment, which copies the path.
+						pathTrigger:
+							customUi?.topBar?.editablePath != false ||
+							customUi?.topBar?.editableSummary != false
+								? flowPathTrigger
+								: undefined
 					}}
 					actions={flowHeaderActions}
 					contexts={headerContexts}
diff --git a/frontend/src/lib/components/ScriptBuilder.svelte b/frontend/src/lib/components/ScriptBuilder.svelte
index ad57b192bb..ad869ed492 100644
--- a/frontend/src/lib/components/ScriptBuilder.svelte
+++ b/frontend/src/lib/components/ScriptBuilder.svelte
@@ -2299,7 +2299,12 @@
 					// invalidates the band before this component is torn down.
 					path: pathSnapshot ?? script?.path,
 					summaryContent: scriptSummary,
-					pathTrigger: scriptPathTrigger
+					// Gated like the summary's own editor: a host that allows neither field keeps the
+					// band's segment, which copies the path.
+					pathTrigger:
+						customUi?.topBar?.editablePath != false || customUi?.topBar?.editableSummary != false
+							? scriptPathTrigger
+							: undefined
 				}}
 				afterName={scriptMarks}
 				actions={scriptHeaderActions}
diff --git a/frontend/src/lib/components/flows/content/AgentEditorModal.svelte b/frontend/src/lib/components/flows/content/AgentEditorModal.svelte
index 08e1906708..0280455e77 100644
--- a/frontend/src/lib/components/flows/content/AgentEditorModal.svelte
+++ b/frontend/src/lib/components/flows/content/AgentEditorModal.svelte
@@ -319,7 +319,9 @@
 				item={{
 					path: pathSnapshot ?? shownPath,
 					summaryContent: agentSummary,
-					pathTrigger: agentPathTrigger
+					// Only where the rename behind it can be saved: a reader who cannot write this agent
+					// keeps the segment that copies the path, rather than an editor with nothing to edit.
+					pathTrigger: readOnly ? undefined : agentPathTrigger
 				}}
 				afterName={agentHint}
 				actions={settings}
diff --git a/frontend/src/lib/components/pageHeaderRegistry.svelte.ts b/frontend/src/lib/components/pageHeaderRegistry.svelte.ts
index e499c77025..a68cda5401 100644
--- a/frontend/src/lib/components/pageHeaderRegistry.svelte.ts
+++ b/frontend/src/lib/components/pageHeaderRegistry.svelte.ts
@@ -6,7 +6,8 @@ export type PageHeaderItem = {
 	/** Absent for an item the picker does not file under a kind — an agent's detail page. The
 	 *  breadcrumb then names the item without claiming it is one of the three. */
 	kind?: WorkspaceItemKind
-	/** Shown whole. Clicking it opens `onEditName` where a page offers one, and copies otherwise. */
+	/** Shown whole. Clicking it opens whatever the page hangs off it with `pathTrigger`, and copies
+	 *  the path where there is none. */
 	path: string | undefined
 	/** Wraps the band's own path segment in whatever the page wants behind it — its rename
 	 *  popover, anchored there rather than beside the summary, so the editor opens under the half
diff --git a/frontend/src/lib/utils/forkColor.ts b/frontend/src/lib/utils/forkColor.ts
index ca44541696..eb9af17b32 100644
--- a/frontend/src/lib/utils/forkColor.ts
+++ b/frontend/src/lib/utils/forkColor.ts
@@ -78,11 +78,14 @@ function contrast(a: number, b: number): number {
 	return (Math.max(a, b) + 0.05) / (Math.min(a, b) + 0.05)
 }
 
-/** Luminance of what `hslFloorL` paints, not of the exact numbers: a percent of lightness is
- *  worth more than the margin being solved for. */
+/** Luminance of what the browser paints, which is neither the exact numbers nor the `hsl()` string
+ *  alone: the string carries whole percents, and the channels it resolves to are 8-bit. Solving
+ *  against the unrounded channels leaves the chosen lightness up to 0.025 short of the target once
+ *  painted, which is enough to miss AA on a hue like #993388. */
 function paintedLuminance(h: number, s: number, l: number): number {
 	const [r, g, b] = hslToRgb(Math.round(h), Math.round(s * 100) / 100, Math.floor(l * 100) / 100)
-	return relativeLuminance(r, g, b)
+	const q = (x: number) => Math.round(x * 255) / 255
+	return relativeLuminance(q(r), q(g), q(b))
 }
 
 /**