diff --git a/wasm-port/docs/compatibility-validation.md b/wasm-port/docs/compatibility-validation.md
index 1dad572..06b0b85 100644
--- a/wasm-port/docs/compatibility-validation.md
+++ b/wasm-port/docs/compatibility-validation.md
@@ -110,7 +110,7 @@ machine-session validation remain future work.
 The current fixture expectations validate standalone behavior against both the
 vendored LinuxCNC source path and an upstream `rs274` side-by-side baseline for
 parser/conversion, offsets, feed-control, comment/logging, numbered-parameter,
-spindle-orient, file-open reset, file-finish, tool-reload, and O-word
+probing, spindle-orient, file-open reset, file-finish, tool-reload, and O-word
 subroutine fixtures, plus threading/rigid tap, NURBS dispatch boundaries, and
 the comparable canonical runtime edge and program-end cleanup calls. Fixtures
 that depend on standalone-only runtime adapters, HAL/INI/tool table setup,
diff --git a/wasm-port/docs/drift-report.md b/wasm-port/docs/drift-report.md
index 757c652..f1933cf 100644
--- a/wasm-port/docs/drift-report.md
+++ b/wasm-port/docs/drift-report.md
@@ -67,13 +67,13 @@ semantic rewrites:
   source.
 - Fixture expectations are checked against the standalone vendored source
   path. The upstream `rs274` side-by-side baseline now covers simple motion,
-  offsets, feed-control, comment/logging, numbered-parameter, spindle-orient,
-  file-open reset, file-finish, tool-reload, and O-word subroutine fixtures;
-  it also covers threading/rigid tap, NURBS dispatch boundaries, and comparable
-  canonical runtime edge and program-end cleanup calls. Adapter-heavy fixtures,
-  standalone modal-state assertions, and upstream `rs274` output gaps such as
-  `WAIT` or hidden NURBS control-point detail still need dedicated native
-  LinuxCNC baselines.
+  offsets, feed-control, comment/logging, numbered-parameter, probing,
+  spindle-orient, file-open reset, file-finish, tool-reload, and O-word
+  subroutine fixtures; it also covers threading/rigid tap, NURBS dispatch
+  boundaries, and comparable canonical runtime edge and program-end cleanup
+  calls. Adapter-heavy fixtures, standalone modal-state assertions, and
+  upstream `rs274` output gaps such as `WAIT` or hidden NURBS control-point
+  detail still need dedicated native LinuxCNC baselines.
 
 ## Current Drift Conclusion
 
diff --git a/wasm-port/tools/verify_native_linuxcnc_fixture_baseline.sh b/wasm-port/tools/verify_native_linuxcnc_fixture_baseline.sh
index bac3c67..99ec0b9 100755
--- a/wasm-port/tools/verify_native_linuxcnc_fixture_baseline.sh
+++ b/wasm-port/tools/verify_native_linuxcnc_fixture_baseline.sh
@@ -24,6 +24,7 @@ FIXTURES=(
   oword_subroutine
   percent_file_finish
   position_params
+  probe_semantics
   program_end_modal_reset
   spindle_orient
   threading_sync
@@ -328,6 +329,16 @@ normalize_standalone_events() {
         next
       }
 
+      if (line == "TURN_PROBE_ON" || line == "TURN_PROBE_OFF") {
+        print line
+        next
+      }
+
+      if (line ~ /^STRAIGHT_PROBE /) {
+        print "STRAIGHT_PROBE"
+        next
+      }
+
       if (line ~ /^STRAIGHT_(TRAVERSE|FEED) /) {
         split(line, fields, /[[:space:]]+/)
         for (i in fields) {
@@ -598,6 +609,18 @@ normalize_upstream_rs274_output() {
         next
       }
 
+      if (line == "TURN_PROBE_ON()" || line == "TURN_PROBE_OFF()") {
+        value = line
+        sub(/\(\)$/, "", value)
+        print value
+        next
+      }
+
+      if (line ~ /^STRAIGHT_PROBE\(/) {
+        print "STRAIGHT_PROBE"
+        next
+      }
+
       if (line ~ /^STRAIGHT_(TRAVERSE|FEED)\(/) {
         op = line
         sub(/\(.*/, "", op)