diff --git a/src/summary.ts b/src/summary.ts
index 67bcea1..d278814 100644
--- a/src/summary.ts
+++ b/src/summary.ts
@@ -52,9 +52,11 @@ export function readCall(
   args: { path?: string; offset?: number; limit?: number },
   max: number = DEFAULT_CLIP,
 ): string {
+  const offset = args.offset ? Number(args.offset) : undefined;
+  const limit = args.limit ? Number(args.limit) : undefined;
   const range =
-    args.offset || args.limit
-      ? theme.fg("dim", ` · lines ${args.offset ?? 1}${args.limit ? `–${(args.offset ?? 1) + args.limit - 1}` : "+"}`)
+    offset || limit
+      ? theme.fg("dim", ` · lines ${offset ?? 1}${limit ? `–${(offset ?? 1) + limit - 1}` : "+"}`)
       : "";
   return title(theme, "Read") + theme.fg("accent", compactPath(args.path ?? "", max)) + range;
 }
diff --git a/test/pretty.test.ts b/test/pretty.test.ts
index 0375cff..32e9f16 100644
--- a/test/pretty.test.ts
+++ b/test/pretty.test.ts
@@ -29,6 +29,19 @@ test("readCall shows path and range", () => {
   assert.equal(readCall(theme, { path: "src/a.ts" }), "Read src/a.ts");
   assert.ok(readCall(theme, { path: "a", offset: 10, limit: 5 }).includes("lines 10–14"));
   assert.ok(readCall(theme, { path: "a", offset: 3 }).includes("lines 3+"));
+  // LLMs may pass numeric arguments as strings at runtime
+  assert.ok(
+    readCall(theme, { path: "a", offset: "1" as unknown as number, limit: "2000" as unknown as number }).includes(
+      "lines 1–2000",
+    ),
+  );
+  assert.ok(
+    readCall(theme, { path: "a", offset: "1046" as unknown as number, limit: "400" as unknown as number }).includes(
+      "lines 1046–1445",
+    ),
+  );
+  assert.ok(readCall(theme, { path: "a", offset: "5" as unknown as number }).includes("lines 5+"));
+  assert.ok(readCall(theme, { path: "a", limit: "20" as unknown as number }).includes("lines 1–20"));
 });
 
 test("readSummary counts lines, flags truncation and failure", () => {