diff --git a/wasm-port/docs/compatibility-validation.md b/wasm-port/docs/compatibility-validation.md
index 0b4b61d..fc8a922 100644
--- a/wasm-port/docs/compatibility-validation.md
+++ b/wasm-port/docs/compatibility-validation.md
@@ -301,7 +301,9 @@ load/save behavior through vendored `tooldata_common.cc`, including the
 non-random and random-toolchanger `tooldata_init()` branches, with the SDK
 only copying text into the Emscripten filesystem and calling the exported C
 ABI; the browser smoke checks the random-toolchanger `tooldata_save()` C ABI
-result before OPFS persistence writes the saved table text back. The same
+result before OPFS persistence writes the saved table text back, and verifies
+that an INI-derived custom tool-table OPFS path can be saved and read back
+after the table is loaded through vendored LinuxCNC. The same
 Node WASM and browser interpreter smokes now validate the exported
 `Interp::init()`/`Interp::synch()` probe for initialization canonical events,
 metric/inch `emcStatus` machine-unit conversion, and current/selected tool
diff --git a/wasm-port/tests/browser/interp_smoke.html b/wasm-port/tests/browser/interp_smoke.html
index d074792..f4ced92 100644
--- a/wasm-port/tests/browser/interp_smoke.html
+++ b/wasm-port/tests/browser/interp_smoke.html
@@ -599,6 +599,34 @@
           "tool_1.comment=browser custom tool",
         ].join("\n"),
       );
+      const savedIniNamedToolTable = await saveMachineToolTableToOpfs(
+        interp,
+        "browser-ini-file-session",
+        {
+          opfsPath: loadedIniFileSession.toolTable.opfsPath,
+          wasmPath: loadedIniFileSession.toolTable.wasmPath,
+        },
+      );
+      verifyExpectedOutput(
+        "opfs_save_ini_named_tool_table",
+        savedIniNamedToolTable.result,
+        [
+          "tooldata_save=0",
+          "tool_1.toolno=8",
+          "tool_1.pocketno=8",
+        ].join("\n"),
+      );
+      verifyExpectedOutput(
+        "opfs_saved_ini_named_tool_table_text",
+        await loadTextFile(loadedIniFileSession.toolTable.opfsPath),
+        [
+          "T8",
+          "P8",
+          "Z+4.500000",
+          "D+0.500000",
+          ";browser custom tool",
+        ].join("\n"),
+      );
 
       await saveMachineTextFiles("browser-ini-override-session", {
         ini: [