diff --git a/apps/desktop/src/app/right-sidebar/terminal/use-terminal-session.ts b/apps/desktop/src/app/right-sidebar/terminal/use-terminal-session.ts
index 1e0b5f93134..7c0f13da5c0 100644
--- a/apps/desktop/src/app/right-sidebar/terminal/use-terminal-session.ts
+++ b/apps/desktop/src/app/right-sidebar/terminal/use-terminal-session.ts
@@ -315,8 +315,11 @@ export function useTerminalSession({ cwd, onAddSelectionToChat }: UseTerminalSes
       allowTransparency: true,
       convertEol: true,
       cursorBlink: true,
-      fontFamily: "'SF Mono', 'Menlo', 'Cascadia Code', 'JetBrains Mono', monospace",
+      fontFamily: "'JetBrains Mono', 'Cascadia Code', 'SF Mono', Menlo, Consolas, monospace",
       fontSize: 11,
+      fontWeight: '400',
+      fontWeightBold: '700',
+      letterSpacing: 0,
       lineHeight: 1.12,
       // Full-screen TUIs (hermes --tui, vim) grab the mouse, so a plain drag
       // can't select — ⌥-drag (macOS) / Shift-drag (else) forces a native
@@ -598,13 +601,13 @@ export function useTerminalSession({ cwd, onAddSelectionToChat }: UseTerminalSes
       startSession()
     }
 
-    const fonts = typeof document !== 'undefined' ? document.fonts : undefined
+    // fonts.ready settles only already-requested faces; bold/italic aren't asked
+    // for until styled output paints (past atlas init), so warm them up front.
+    const warm = document.fonts?.load
+      ? Promise.allSettled(['400', '700', 'italic 400'].map(v => document.fonts.load(`${v} 11px 'JetBrains Mono'`)))
+      : Promise.resolve()
 
-    if (fonts?.ready) {
-      void fonts.ready.then(mount, mount)
-    } else {
-      mount()
-    }
+    void warm.then(mount, mount)
 
     return () => {
       disposed = true
diff --git a/apps/desktop/src/fonts/JetBrainsMono-Bold.woff2 b/apps/desktop/src/fonts/JetBrainsMono-Bold.woff2
new file mode 100644
index 00000000000..81c5a219dca
Binary files /dev/null and b/apps/desktop/src/fonts/JetBrainsMono-Bold.woff2 differ
diff --git a/apps/desktop/src/fonts/JetBrainsMono-Italic.woff2 b/apps/desktop/src/fonts/JetBrainsMono-Italic.woff2
new file mode 100644
index 00000000000..4103d391055
Binary files /dev/null and b/apps/desktop/src/fonts/JetBrainsMono-Italic.woff2 differ
diff --git a/apps/desktop/src/fonts/JetBrainsMono-Regular.woff2 b/apps/desktop/src/fonts/JetBrainsMono-Regular.woff2
new file mode 100644
index 00000000000..66c54672c78
Binary files /dev/null and b/apps/desktop/src/fonts/JetBrainsMono-Regular.woff2 differ
diff --git a/apps/desktop/src/styles.css b/apps/desktop/src/styles.css
index 76b31331680..a73631d3609 100644
--- a/apps/desktop/src/styles.css
+++ b/apps/desktop/src/styles.css
@@ -17,6 +17,30 @@
   src: url('../../../node_modules/@nous-research/ui/dist/fonts/Collapse-Bold.woff2') format('woff2');
 }
 
+/* JetBrains Mono — bundled terminal font (Apache-2.0) so bold/italic share the
+   regular face's metrics instead of squeezing against a system fallback. */
+@font-face {
+  font-family: 'JetBrains Mono';
+  font-style: normal;
+  font-weight: 400;
+  font-display: swap;
+  src: url('./fonts/JetBrainsMono-Regular.woff2') format('woff2');
+}
+@font-face {
+  font-family: 'JetBrains Mono';
+  font-style: normal;
+  font-weight: 700;
+  font-display: swap;
+  src: url('./fonts/JetBrainsMono-Bold.woff2') format('woff2');
+}
+@font-face {
+  font-family: 'JetBrains Mono';
+  font-style: italic;
+  font-weight: 400;
+  font-display: swap;
+  src: url('./fonts/JetBrainsMono-Italic.woff2') format('woff2');
+}
+
 @theme inline {
   --color-background: var(--dt-background);
   --color-foreground: var(--dt-foreground);