diff --git a/src/ansi.test.ts b/src/ansi.test.ts
index 55eb5ba..0fa1611 100644
--- a/src/ansi.test.ts
+++ b/src/ansi.test.ts
@@ -424,3 +424,61 @@ test("handles only ANSI codes with no text", () => {
   // Opens and closes span even with no text
   expect(result).toBe('<span style="color:#f85149"></span>');
 });
+
+// OSC sequences (Operating System Command)
+test("strips OSC terminal title with BEL", () => {
+  // ESC ] 0 ; title BEL
+  const result = ansiToHtml("\x1b]0;My Terminal Title\x07text after");
+  expect(result).toBe("text after");
+});
+
+test("strips OSC terminal title with ST", () => {
+  // ESC ] 0 ; title ESC \
+  const result = ansiToHtml("\x1b]0;My Terminal Title\x1b\\text after");
+  expect(result).toBe("text after");
+});
+
+test("strips OSC with emoji in title", () => {
+  const result = ansiToHtml("\x1b]0;★ Claude Code\x07hello");
+  expect(result).toBe("hello");
+});
+
+test("strips multiple OSC sequences", () => {
+  const result = ansiToHtml("\x1b]0;title1\x07text\x1b]0;title2\x07more");
+  expect(result).toBe("textmore");
+});
+
+// Private mode sequences (DEC)
+test("strips bracketed paste mode enable", () => {
+  // ESC [ ? 2004 h
+  const result = ansiToHtml("\x1b[?2004htext");
+  expect(result).toBe("text");
+});
+
+test("strips bracketed paste mode disable", () => {
+  // ESC [ ? 2004 l
+  const result = ansiToHtml("\x1b[?2004ltext");
+  expect(result).toBe("text");
+});
+
+test("strips mixed private mode and SGR", () => {
+  const result = ansiToHtml("\x1b[?2004h\x1b[31mred\x1b[0m\x1b[?2004l");
+  expect(result).toBe('<span style="color:#f85149">red</span>');
+});
+
+test("strips cursor visibility sequences", () => {
+  // ESC [ ? 25 h (show cursor) and ESC [ ? 25 l (hide cursor)
+  const result = ansiToHtml("\x1b[?25lhidden cursor\x1b[?25h");
+  expect(result).toBe("hidden cursor");
+});
+
+test("handles Claude Code typical output", () => {
+  // Simulated Claude Code startup with title, bracketed paste, and colors
+  const input =
+    "\x1b]0;★ Claude Code\x07\x1b[?2004h\x1b[1;33mClaude Code\x1b[0m v2.1.15\x1b[?2004l";
+  const result = ansiToHtml(input);
+  expect(result).toContain("Claude Code");
+  expect(result).toContain("v2.1.15");
+  expect(result).not.toContain("2004");
+  expect(result).not.toContain("]0;");
+});
diff --git a/src/ansi.ts b/src/ansi.ts
index 6ee2b3d..d787844 100644
--- a/src/ansi.ts
+++ b/src/ansi.ts
@@ -189,60 +189,88 @@ export function ansiToHtml(text: string): string {
 
   while (i < text.length) {
     // Check for ESC character (char code 27)
-    if (text.charCodeAt(i) === 27 && text[i + 1] === "[") {
-      // Parse CSI sequence: ESC [ params command
-      let j = i + 2;
-      let params = "";
-      while (j < text.length && /[0-9;]/.test(text[j] || "")) {
-        params += text[j];
-        j++;
-      }
-      const command = text[j] || "";
-      j++;
-
-      if (command === "m") {
-        // SGR - Select Graphic Rendition
-        const codes = params ? params.split(";").map(Number) : [0];
-        for (let k = 0; k < codes.length; k++) {
-          const code = codes[k];
-          if (code === 0) {
-            state = resetState();
-          } else if (code === 1) state.bold = true;
-          else if (code === 2) state.dim = true;
-          else if (code === 3) state.italic = true;
-          else if (code === 4) state.underline = true;
-          else if (code === 7) state.inverse = true;
-          else if (code === 22) {
-            state.bold = false;
-            state.dim = false;
-          } else if (code === 23) state.italic = false;
-          else if (code === 24) state.underline = false;
-          else if (code === 27) state.inverse = false;
-          else if (code === 39) state.fg = null;
-          else if (code === 49) state.bg = null;
-          else if (code === 38) {
-            const extColor = parseExtendedColor(codes, k);
-            if (extColor) {
-              state.fg = extColor.color;
-              k += extColor.skip;
-            }
-          } else if (code === 48) {
-            const extColor = parseExtendedColor(codes, k);
-            if (extColor) {
-              state.bg = extColor.color;
-              k += extColor.skip;
-            }
-          } else if (code !== undefined && colors[code]) {
-            state.fg = colors[code];
-          } else if (code !== undefined && bgColors[code]) {
-            state.bg = bgColors[code];
+    if (text.charCodeAt(i) === 27) {
+      // OSC sequence: ESC ] ... BEL or ESC ] ... ESC \
+      // Used for terminal title, hyperlinks, etc.
+      if (text[i + 1] === "]") {
+        let j = i + 2;
+        // Skip until BEL (0x07) or ST (ESC \)
+        while (j < text.length) {
+          if (text.charCodeAt(j) === 0x07) {
+            j++;
+            break;
           }
+          if (text.charCodeAt(j) === 27 && text[j + 1] === "\\") {
+            j += 2;
+            break;
+          }
+          j++;
         }
-
-        applyStyle();
+        i = j;
+        continue;
       }
-      // Skip other escape sequences (H, f, J, K, etc.) - they don't affect our line-based output
-      i = j;
+
+      // CSI sequence: ESC [ params command
+      if (text[i + 1] === "[") {
+        let j = i + 2;
+        let params = "";
+        // Include ? for private mode sequences like ESC[?2004h (bracketed paste)
+        while (j < text.length && /[0-9;?]/.test(text[j] || "")) {
+          params += text[j];
+          j++;
+        }
+        const command = text[j] || "";
+        j++;
+
+        // Only process SGR (m command) for styling, skip others (cursor, clear, etc.)
+        if (command === "m" && !params.includes("?")) {
+          // SGR - Select Graphic Rendition
+          const codes = params ? params.split(";").map(Number) : [0];
+          for (let k = 0; k < codes.length; k++) {
+            const code = codes[k];
+            if (code === 0) {
+              state = resetState();
+            } else if (code === 1) state.bold = true;
+            else if (code === 2) state.dim = true;
+            else if (code === 3) state.italic = true;
+            else if (code === 4) state.underline = true;
+            else if (code === 7) state.inverse = true;
+            else if (code === 22) {
+              state.bold = false;
+              state.dim = false;
+            } else if (code === 23) state.italic = false;
+            else if (code === 24) state.underline = false;
+            else if (code === 27) state.inverse = false;
+            else if (code === 39) state.fg = null;
+            else if (code === 49) state.bg = null;
+            else if (code === 38) {
+              const extColor = parseExtendedColor(codes, k);
+              if (extColor) {
+                state.fg = extColor.color;
+                k += extColor.skip;
+              }
+            } else if (code === 48) {
+              const extColor = parseExtendedColor(codes, k);
+              if (extColor) {
+                state.bg = extColor.color;
+                k += extColor.skip;
+              }
+            } else if (code !== undefined && colors[code]) {
+              state.fg = colors[code];
+            } else if (code !== undefined && bgColors[code]) {
+              state.bg = bgColors[code];
+            }
+          }
+
+          applyStyle();
+        }
+        // Skip all CSI sequences (SGR handled above, others like cursor/clear ignored)
+        i = j;
+        continue;
+      }
+
+      // Unknown ESC sequence - skip the ESC character
+      i++;
       continue;
     }
 
diff --git a/src/seed.ts b/src/seed.ts
index 6d3bd88..d9f31f0 100644
--- a/src/seed.ts
+++ b/src/seed.ts
@@ -12,9 +12,13 @@ initDb();
 
 const existing = getDeviceBySecret(secret);
 if (existing) {
-	console.log(`device already exists: id=${existing.id} secret=${existing.secret} name=${existing.name}`);
-	process.exit(0);
+  console.log(
+    `device already exists: id=${existing.id} secret=${existing.secret} name=${existing.name}`,
+  );
+  process.exit(0);
 }
 
 const device = createDevice(secret, name);
-console.log(`created device: id=${device.id} secret=${device.secret} name=${device.name}`);
+console.log(
+  `created device: id=${device.id} secret=${device.secret} name=${device.name}`,
+);