diff --git a/wasm-port/docs/compatibility-validation.md b/wasm-port/docs/compatibility-validation.md
index c3e0a82..ff3319d 100644
--- a/wasm-port/docs/compatibility-validation.md
+++ b/wasm-port/docs/compatibility-validation.md
@@ -141,6 +141,8 @@ through vendored `Interp::restore_parameters()` and `Interp::save_parameters()`,
 and directly checks missing-file success plus out-of-order parameter-file
 rejection through the same LinuxCNC `restore_parameters()` C ABI,
 to load/save LinuxCNC tool tables through vendored `tooldata_common.cc`, and
+to check the random-toolchanger `tooldata_save()` result before OPFS text
+writeback,
 to reject invalid INI-derived parameter/tool-table file names through the OPFS
 path model after the names are parsed by the LinuxCNC-backed INI WASM SDK. It
 also verifies that explicit session parameter/tool-table file-name options
@@ -202,7 +204,7 @@ The validation fails if:
 | `tests/wasm/node/verify_interp_wasm.sh` | Validates the initial interpreter-core WASM module can be built from vendored LinuxCNC interpreter source, loaded through the interpreter JS SDK, run the first fixture group through `Interp::execute()` and selected file fixtures through `Interp::open()`/`read()`/`execute()`, match the native canonical event plus required state readback fixtures, and run parameter-file restore/save through vendored LinuxCNC `Interp::restore_parameters()` and `Interp::save_parameters()`. |
 | `tests/opfs/node/verify_file_service.sh` | Validates the host-owned OPFS text-file adapter, path model, session snapshot store including custom filenames and envelope/path rejection paths, machine file store, G-code text store including filename rejection paths, OPFS-to-WASM parameter/tool-table bridges, and grouped machine-session loading without moving file persistence, parameter semantics, or tool-table semantics into the WASM core. |
 | `tests/browser/verify_ini_panel_browser.sh` | Validates the INI SDK, INI/interpreter WASM module loading, LinuxCNC-backed INI machine-session file-name string lookup, OPFS text-file round trip, generic session snapshot round trip plus custom filename and envelope/path rejection paths, machine file text round trip, G-code text round trip plus filename rejection paths, and the INI panel UI's machine-session load with default OPFS parameter/tool-table file mapping, G-code run, and canonical-event display paths in a real browser runtime. |
-| `tests/browser/verify_interp_browser.sh` | Validates the interpreter-core WASM module loads through the interpreter JS SDK in a real browser runtime and runs selected positive and negative canonical fixtures through vendored LinuxCNC `Interp::execute()` plus `Interp::open()`/`read()`/`execute()` via the exported C ABI, including OPFS-backed parameter-file restore/save and tool-table load/save through vendored LinuxCNC source. |
+| `tests/browser/verify_interp_browser.sh` | Validates the interpreter-core WASM module loads through the interpreter JS SDK in a real browser runtime and runs selected positive and negative canonical fixtures through vendored LinuxCNC `Interp::execute()` plus `Interp::open()`/`read()`/`execute()` via the exported C ABI, including OPFS-backed parameter-file restore/save and non-random/random tool-table load/save through vendored LinuxCNC source. |
 | `tests/host/verify_host_smokes.sh` | Runs the current host-side Node, WASM interpreter-core, OPFS, and browser smoke validation with shared WASM builds. |
 
 ## Fixture Coverage
@@ -277,7 +279,8 @@ by vendored `save_parameters()`. It also covers LinuxCNC tool-table
 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.
+ABI; the browser smoke checks the random-toolchanger `tooldata_save()` C ABI
+result before OPFS persistence writes the saved table text back.
 OPFS validation covers the JavaScript host-boundary adapter, the INI browser
 smoke harness, the INI panel UI's machine-session load and G-code run buttons,
 the raw canonical-event display fed directly by LinuxCNC interpreter WASM
diff --git a/wasm-port/tests/browser/interp_smoke.html b/wasm-port/tests/browser/interp_smoke.html
index 3e65b19..55118e8 100644
--- a/wasm-port/tests/browser/interp_smoke.html
+++ b/wasm-port/tests/browser/interp_smoke.html
@@ -396,11 +396,20 @@
           "tool_index_for_tool_2=7",
         ].join("\n"),
       );
-      await saveMachineToolTableToOpfs(
+      const savedRandomToolTable = await saveMachineToolTableToOpfs(
         interp,
         "browser-random-toolchanger",
         { wasmPath: "/work/browser-random-tool.tbl" },
       );
+      verifyExpectedOutput(
+        "opfs_save_random_tool_table",
+        savedRandomToolTable.result,
+        [
+          "tooldata_save=0",
+          "tool_pocket_7.toolno=2",
+          "tool_pocket_9.toolno=5",
+        ].join("\n"),
+      );
       const savedRandomMachineFiles = await loadMachineTextFiles(
         "browser-random-toolchanger",
       );