diff --git a/AGENTS.md b/AGENTS.md
index b1f11bd3db1..c66bda6a28d 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -586,8 +586,8 @@ The mobile app lives in `mobile/` — a Flutter app using Riverpod + Hooks.
   over raw `Theme.of(context)` calls.
 - **Keep widgets small and composable.** One public widget per file; push
   private sub-widgets (`_Foo`) into sibling `part` files under a
-  `<page>/` folder rather than growing the page file. Hard ceiling:
-  **1000 lines/file**, enforced across Desktop, Web, and Mobile by the
+  `<page>/` folder rather than growing the page file. Mobile's hard ceiling is
+  **1200 lines/file**, enforced with the other surface-specific limits by the
   repository-level `just file-size-check` gate (`just check`, CI, and every
   pre-push). If the guard trips, **split the file — never bump the limit or add
   an override to slip under it.**
diff --git a/desktop/scripts/check-file-sizes.mjs b/desktop/scripts/check-file-sizes.mjs
index bfe4fcc8570..97dc4d125aa 100644
--- a/desktop/scripts/check-file-sizes.mjs
+++ b/desktop/scripts/check-file-sizes.mjs
@@ -5,52 +5,57 @@ import { runFileSizeCheck } from "../../scripts/check-file-sizes-core.mjs";
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 const projectRoot = path.resolve(__dirname, "..");
 
-const MAX_LINES = 1000;
+const DESKTOP_FRONTEND_MAX_LINES = 1200;
+const DESKTOP_RUST_MAX_LINES = 1500;
 
 const rules = [
-  { root: "src-tauri/src", extensions: new Set([".rs"]), maxLines: MAX_LINES },
+  {
+    root: "src-tauri/src",
+    extensions: new Set([".rs"]),
+    maxLines: DESKTOP_RUST_MAX_LINES,
+  },
   // Workspace member crates. Without this the ratchet's only Rust root is
   // `src-tauri/src`, and a crate under `src-tauri/crates/` is born outside the
   // repo's one size discipline -- silently, since the check still exits 0.
   {
     root: "src-tauri/crates",
     extensions: new Set([".rs"]),
-    maxLines: MAX_LINES,
+    maxLines: DESKTOP_RUST_MAX_LINES,
   },
   {
     root: "src/app",
     extensions: new Set([".ts", ".tsx"]),
-    maxLines: MAX_LINES,
+    maxLines: DESKTOP_FRONTEND_MAX_LINES,
   },
   {
     root: "src/features",
     extensions: new Set([".ts", ".tsx"]),
-    maxLines: MAX_LINES,
+    maxLines: DESKTOP_FRONTEND_MAX_LINES,
   },
   {
     root: "src/shared/api",
     extensions: new Set([".ts", ".tsx"]),
-    maxLines: MAX_LINES,
+    maxLines: DESKTOP_FRONTEND_MAX_LINES,
   },
   {
     root: "src/shared/context",
     extensions: new Set([".ts", ".tsx"]),
-    maxLines: MAX_LINES,
+    maxLines: DESKTOP_FRONTEND_MAX_LINES,
   },
   {
     root: "src/shared/lib",
     extensions: new Set([".ts", ".tsx"]),
-    maxLines: MAX_LINES,
+    maxLines: DESKTOP_FRONTEND_MAX_LINES,
   },
   {
     root: "src/shared/ui",
     extensions: new Set([".ts", ".tsx"]),
-    maxLines: MAX_LINES,
+    maxLines: DESKTOP_FRONTEND_MAX_LINES,
   },
   {
     root: "src/shared/styles",
     extensions: new Set([".css"]),
-    maxLines: MAX_LINES,
+    maxLines: DESKTOP_FRONTEND_MAX_LINES,
   },
 ];
 
diff --git a/mobile/scripts/check-file-sizes.mjs b/mobile/scripts/check-file-sizes.mjs
index 765cd8edcfb..4d3fb781ce7 100644
--- a/mobile/scripts/check-file-sizes.mjs
+++ b/mobile/scripts/check-file-sizes.mjs
@@ -5,7 +5,7 @@ import { runFileSizeCheck } from "../../scripts/check-file-sizes-core.mjs";
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 const projectRoot = path.resolve(__dirname, "..");
 
-const MAX_LINES = 1000;
+const MAX_LINES = 1200;
 
 const rules = [
   {
diff --git a/scripts/check-file-sizes-core.test.mjs b/scripts/check-file-sizes-core.test.mjs
index 9b4b910404d..846f0e71767 100644
--- a/scripts/check-file-sizes-core.test.mjs
+++ b/scripts/check-file-sizes-core.test.mjs
@@ -1,6 +1,6 @@
 import assert from "node:assert/strict";
 import { execFileSync } from "node:child_process";
-import { mkdtempSync } from "node:fs";
+import { mkdtempSync, readFileSync } from "node:fs";
 import { tmpdir } from "node:os";
 import path from "node:path";
 import test from "node:test";
@@ -53,6 +53,27 @@ test("counts empty, LF, and CRLF content with the existing semantics", () => {
   assert.equal(countLines("one\r\ntwo"), 2);
 });
 
+test("surface entrypoints keep the intended ceilings", () => {
+  const repoRoot = path.resolve(import.meta.dirname, "..");
+  const desktop = readFileSync(
+    path.join(repoRoot, "desktop/scripts/check-file-sizes.mjs"),
+    "utf8",
+  );
+  const mobile = readFileSync(
+    path.join(repoRoot, "mobile/scripts/check-file-sizes.mjs"),
+    "utf8",
+  );
+  const web = readFileSync(
+    path.join(repoRoot, "web/scripts/check-file-sizes.mjs"),
+    "utf8",
+  );
+
+  assert.match(desktop, /DESKTOP_FRONTEND_MAX_LINES = 1200/);
+  assert.match(desktop, /DESKTOP_RUST_MAX_LINES = 1500/);
+  assert.match(mobile, /MAX_LINES = 1200/);
+  assert.match(web, /MAX_LINES = 1000/);
+});
+
 test("new files use the configured ceiling", () => {
   assert.equal(allowedLineCount(null, 1000), 1000);
   assert.deepEqual(