diff --git a/frontend/src/app/pages/AgentChat/parsing/toolResultParsing.ts b/frontend/src/app/pages/AgentChat/parsing/toolResultParsing.ts
index a49bf603..865ee047 100644
--- a/frontend/src/app/pages/AgentChat/parsing/toolResultParsing.ts
+++ b/frontend/src/app/pages/AgentChat/parsing/toolResultParsing.ts
@@ -163,6 +163,8 @@ const PLATFORM_NOTE_PREAMBLE =
   'This block is authored by the OpenSwarm platform, not tool output and not a prior message. It is trusted context.';
 
 export function extractPlatformNote(rawText: string): { body: string; note: string | null } {
+  // The web tools' trailing "[presentation] ..." paragraph is model-facing rendering guidance, never for humans.
+  rawText = rawText.replace(/\n*\[presentation\] When you answer the user[\s\S]*$/, '').trimEnd();
   if (!rawText.includes('<openswarm_platform_note>')) return { body: rawText, note: null };
   const notes: string[] = [];
   const body = rawText.replace(PLATFORM_NOTE_RE, (matched: string, inner: string) => {
diff --git a/frontend/src/app/pages/AgentChat/tool-bubbles/CompactMcpBubble.tsx b/frontend/src/app/pages/AgentChat/tool-bubbles/CompactMcpBubble.tsx
index 6a66afd3..fc7e447c 100644
--- a/frontend/src/app/pages/AgentChat/tool-bubbles/CompactMcpBubble.tsx
+++ b/frontend/src/app/pages/AgentChat/tool-bubbles/CompactMcpBubble.tsx
@@ -183,7 +183,7 @@ export const CompactMcpBubble: React.FC<CompactMcpBubbleProps> = ({
           sx={{
             bgcolor: tc.TERM_BG,
             borderRadius: 1.5,
-            maxHeight: '60vh',
+            maxHeight: 'min(40vh, 320px)',
             overflowY: 'auto',
             overflowX: 'hidden',
             '&::-webkit-scrollbar': { width: 5 },
diff --git a/frontend/src/app/pages/AgentChat/tool-bubbles/DefaultToolBubble.tsx b/frontend/src/app/pages/AgentChat/tool-bubbles/DefaultToolBubble.tsx
index 7c5df586..0d726df5 100644
--- a/frontend/src/app/pages/AgentChat/tool-bubbles/DefaultToolBubble.tsx
+++ b/frontend/src/app/pages/AgentChat/tool-bubbles/DefaultToolBubble.tsx
@@ -223,7 +223,7 @@ export const DefaultToolBubble: React.FC<DefaultToolBubbleProps> = ({
             sx={{
               bgcolor: tc.TERM_BG,
               borderRadius: 1.5,
-              maxHeight: 500,
+              maxHeight: 'min(40vh, 320px)',
               overflow: 'auto',
               '&::-webkit-scrollbar': { width: 5 },
               '&::-webkit-scrollbar-track': { background: 'transparent' },