refactor(server): canonicalize service API (#31049)

packages/tui/src/util/collapse-tool-output.ts

@@ -0,0 +1,19 @@
+export function collapseToolOutput(output: string, maxLines: number, maxChars: number) {
+  const lines = output.split("\n")
+  if (lines.length <= maxLines && Array.from(output).length <= maxChars) {
+    return { output, overflow: false }
+  }
+
+  const preview = lines.slice(0, maxLines).join("\n")
+  if (Array.from(preview).length > maxChars) {
+    return {
+      output:
+        Array.from(preview)
+          .slice(0, Math.max(0, maxChars - 1))
+          .join("") + "…",
+      overflow: true,
+    }
+  }
+
+  return { output: [...lines.slice(0, maxLines), "…"].join("\n"), overflow: true }
+}