diff --git a/check-linuxcnc-switchkins-remap-source-map.sh b/check-linuxcnc-switchkins-remap-source-map.sh
new file mode 100755
index 0000000..624fddb
--- /dev/null
+++ b/check-linuxcnc-switchkins-remap-source-map.sh
@@ -0,0 +1,93 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+cd "$(dirname "$0")"
+
+# LinuxCNC source basis: this guard ties generated switchkins/remap aliases and
+# config cases to LinuxCNC configs/sim INI REMAP entries, remap_subs
+# #<kinstype> assignments, and halcmd loadusr parsing sources. It validates
+# generator/table policy only; it does not add CNC behavior or expand smoke.
+linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
+linuxcnc_root=$(cd "$linuxcnc_root" && pwd)
+
+grep -F 'LinuxCNC source basis: generated switchkins/remap tables are extracted from' \
+    generate-linuxcnc-switchkins-remap-table.sh >/dev/null
+grep -F 'src/hal/utils/halcmd_commands.cc do_loadusr_cmd()' \
+    generate-linuxcnc-switchkins-remap-table.sh >/dev/null
+grep -F 'getopt("+wWin:")' generate-linuxcnc-switchkins-remap-table.sh >/dev/null
+grep -F 'src/hal/utils/halcmd_completion.c lists the common -W/-Wn/-w/-iw forms' \
+    generate-linuxcnc-switchkins-remap-table.sh >/dev/null
+grep -F 'LinuxCNC TOOL_TABLE source is not listed as tooldata' \
+    generate-linuxcnc-switchkins-remap-table.sh >/dev/null
+
+grep -F 'LinuxCNC source basis: switchkins/remap table validation derives M428/M429/M430' \
+    check-linuxcnc-switchkins-remap-table.sh >/dev/null
+grep -F 'validate_tool_table_source_coverage_only' \
+    check-linuxcnc-switchkins-remap-table.sh >/dev/null
+grep -F 'exposes TOOL_TABLE through switchkins API/web bridge' \
+    check-linuxcnc-switchkins-remap-table.sh >/dev/null
+
+grep -F 'int do_loadusr_cmd(const char *args[])' "$linuxcnc_root/src/hal/utils/halcmd_commands.cc" >/dev/null
+grep -F 'getopt(argc,' "$linuxcnc_root/src/hal/utils/halcmd_commands.cc" >/dev/null
+grep -F '"+wWin:"' "$linuxcnc_root/src/hal/utils/halcmd_commands.cc" >/dev/null
+grep -F -- '-Wn' "$linuxcnc_root/src/hal/utils/halcmd_completion.c" >/dev/null
+
+python3 - "$linuxcnc_root" <<'PY'
+from pathlib import Path
+import json
+import re
+import sys
+
+linuxcnc_root = Path(sys.argv[1])
+source_map = Path("docs/linuxcnc-switchkins-remap-source-map.md").read_text(encoding="utf-8")
+table = Path("core/src/linuxcnc_switchkins_remap_table.inc").read_text(encoding="utf-8")
+cpp_cases = Path("core/tests/linuxcnc_switchkins_remap_config_cases.inc").read_text(encoding="utf-8")
+json_cases = json.loads(Path("web/public/linuxcnc_switchkins_remap_config_cases.json").read_text(encoding="utf-8"))
+
+counts = {
+    "core/src/linuxcnc_switchkins_remap_table.inc": len(re.findall(r'^\s*\{"', table, re.M)),
+    "core/tests/linuxcnc_switchkins_remap_config_cases.inc": len(re.findall(r'^\s*\{"', cpp_cases, re.M)),
+    "web/public/linuxcnc_switchkins_remap_config_cases.json": len(json_cases),
+}
+for path, count in counts.items():
+    if f"| `{path}` | {count} |" not in source_map:
+        raise SystemExit(f"docs/linuxcnc-switchkins-remap-source-map.md count mismatch for {path}")
+
+remap_sources = [
+    path
+    for path in (linuxcnc_root / "configs/sim").rglob("*remap.ngc")
+    if path.name in {"428remap.ngc", "429remap.ngc", "430remap.ngc"}
+]
+remap_ini_re = re.compile(r"REMAP\s*=\s*M(428|429|430)(?:\D|$)", re.I)
+remap_inis = [
+    path
+    for path in (linuxcnc_root / "configs/sim").rglob("*.ini")
+    if remap_ini_re.search(path.read_text(encoding="utf-8", errors="ignore"))
+]
+if f"| LinuxCNC M428/M429/M430 remap sources | {len(remap_sources)} |" not in source_map:
+    raise SystemExit("docs/linuxcnc-switchkins-remap-source-map.md remap source count mismatch")
+if f"| LinuxCNC switchkins REMAP INI sources | {len(remap_inis)} |" not in source_map:
+    raise SystemExit("docs/linuxcnc-switchkins-remap-source-map.md REMAP INI source count mismatch")
+
+required_phrases = [
+    "must not add new smoke parser behavior",
+    "`#<kinstype>` assignments",
+    "[EMCIO] TOOL_TABLE` entries are source coverage only",
+    "must not become generated switchkins aliases",
+    "./check-linuxcnc-switchkins-remap-table.sh linuxcnc-kinematics-source-files.txt",
+]
+for phrase in required_phrases:
+    if phrase not in source_map:
+        raise SystemExit(
+            f"docs/linuxcnc-switchkins-remap-source-map.md is missing boundary phrase: {phrase}"
+        )
+
+case_fields = {case["field"] for case in json_cases}
+bad_fields = [field for field in case_fields if "tool" in field.lower()]
+if bad_fields:
+    raise SystemExit(f"generated switchkins config cases expose TOOL_TABLE fields: {bad_fields}")
+if re.search(r'\btoolTable\b|\btooltable\b|\btool_table\b|\bTOOL_TABLE\b', Path("web/src/wasm-core.js").read_text(encoding="utf-8")):
+    raise SystemExit("web/src/wasm-core.js exposes TOOL_TABLE through switchkins API")
+if re.search(r'\btoolTable\b|\btooltable\b|\btool_table\b|\bTOOL_TABLE\b', Path("web/src/index.ts").read_text(encoding="utf-8")):
+    raise SystemExit("web/src/index.ts exposes TOOL_TABLE through switchkins API")
+PY
diff --git a/docs/linuxcnc-switchkins-remap-source-map.md b/docs/linuxcnc-switchkins-remap-source-map.md
new file mode 100644
index 0000000..81000fd
--- /dev/null
+++ b/docs/linuxcnc-switchkins-remap-source-map.md
@@ -0,0 +1,48 @@
+# LinuxCNC switchkins/remap source map
+
+This map records the source basis for generated M428/M429/M430 switchkins
+aliases and config cases. It is a generator/table map only; it must not add new smoke parser behavior or expose LinuxCNC source-only assets as browser API fields.
+
+## LinuxCNC Source Basis
+
+- `configs/sim/**.ini` files with `REMAP = M428`, `REMAP = M429`, or
+  `REMAP = M430` provide the switchkins configuration roots.
+- `remap_subs/{428,429,430}remap.ngc` files provide the adjacent
+  `#<kinstype>` assignments.
+- `src/hal/utils/halcmd_commands.cc` `do_loadusr_cmd()` and
+  `getopt("+wWin:")` define the `loadusr` option model used by the generator.
+- `src/hal/utils/halcmd_completion.c` documents common `loadusr`
+  `-W/-Wn/-w/-iw` forms preserved by the generator.
+
+## Generated Coverage
+
+| Output | Count | Source coverage role |
+| --- | ---: | --- |
+| `core/src/linuxcnc_switchkins_remap_table.inc` | 177 | Generated switchkins aliases from LinuxCNC INI/HAL/remap sources. |
+| `core/tests/linuxcnc_switchkins_remap_config_cases.inc` | 616 | Generated C++ config cases for accepted switchkins config fields. |
+| `web/public/linuxcnc_switchkins_remap_config_cases.json` | 616 | Generated browser-readable config cases mirroring the C++ cases. |
+| LinuxCNC M428/M429/M430 remap sources | 31 | LinuxCNC `#<kinstype>` source assignments. |
+| LinuxCNC switchkins REMAP INI sources | 16 | LinuxCNC configs that declare M428/M429/M430 remaps. |
+
+## Boundaries
+
+- `[EMCIO] TOOL_TABLE` entries are source coverage only. They must stay in the kinematics manifest as `tooldata` entries and must not become generated switchkins aliases, config fields, or browser option keys.
+- `asset`, `metadata`, and `tooldata` inputs referenced by switchkins configs
+  are source coverage, not browser API surface.
+- Generated tables must continue to derive M428/M429/M430 kinstypes from
+  LinuxCNC remap `#<kinstype>` assignments, not from hand-authored behavior.
+
+## Checks
+
+Run:
+
+```bash
+./check-linuxcnc-switchkins-remap-source-map.sh
+./check-linuxcnc-switchkins-remap-table.sh linuxcnc-kinematics-source-files.txt
+./test-native.sh
+./test-linuxcnc-source-link.sh
+```
+
+`check-linuxcnc-switchkins-remap-source-map.sh` keeps this document, generator
+source anchors, generated output counts, and source-only `TOOL_TABLE` boundary
+synchronized.
diff --git a/test-all-native.sh b/test-all-native.sh
index 2d61bab..14b3413 100755
--- a/test-all-native.sh
+++ b/test-all-native.sh
@@ -147,6 +147,9 @@ grep -F 'LinuxCNC source basis: this guard keeps the kinematics source map align
 grep -F './check-linuxcnc-kinematics-source-map.sh' test-native.sh >/dev/null
 grep -F 'LinuxCNC source basis: this guard ties browser OPFS parameter persistence' check-linuxcnc-opfs-source-map.sh >/dev/null
 grep -F './check-linuxcnc-opfs-source-map.sh' test-native.sh >/dev/null
+grep -F 'LinuxCNC source basis: this guard ties generated switchkins/remap aliases' check-linuxcnc-switchkins-remap-source-map.sh >/dev/null
+grep -F './check-linuxcnc-switchkins-remap-source-map.sh' test-native.sh >/dev/null
+grep -F './check-linuxcnc-switchkins-remap-source-map.sh' test-linuxcnc-source-link.sh >/dev/null
 grep -F 'LinuxCNC source basis: the cached input checker keys check-linuxcnc-inputs.sh' check-linuxcnc-inputs-cached.sh >/dev/null
 grep -F 'LinuxCNC source basis: switchkins/remap table validation derives M428/M429/M430' check-linuxcnc-switchkins-remap-table.sh >/dev/null
 grep -F 'LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh "$manifest" --require-kinematics-complete' check-linuxcnc-switchkins-remap-table.sh >/dev/null
@@ -215,6 +218,10 @@ grep -F 'Browser-side file persistence remains OPFS-only' docs/linuxcnc-kinemati
 grep -F 'LinuxCNC OPFS source map' docs/linuxcnc-opfs-source-map.md >/dev/null
 grep -F '`Interp::save_parameters()` for `filename + ".new"`' docs/linuxcnc-opfs-source-map.md >/dev/null
 grep -F 'Browser contexts with OPFS support must not disable OPFS.' docs/linuxcnc-opfs-source-map.md >/dev/null
+grep -F 'LinuxCNC switchkins/remap source map' docs/linuxcnc-switchkins-remap-source-map.md >/dev/null
+grep -F '| `core/src/linuxcnc_switchkins_remap_table.inc` | 177 | Generated switchkins aliases from LinuxCNC INI/HAL/remap sources. |' docs/linuxcnc-switchkins-remap-source-map.md >/dev/null
+grep -F '[EMCIO] TOOL_TABLE` entries are source coverage only' docs/linuxcnc-switchkins-remap-source-map.md >/dev/null
+grep -F './check-linuxcnc-switchkins-remap-source-map.sh' test-linuxcnc-source-link.sh >/dev/null
 grep -F 'check-linuxcnc-switchkins-remap-table-cached.sh --cache-dir "$preflight_cache_dir" linuxcnc-kinematics-source-files.txt' test-native.sh >/dev/null
 grep -F 'check-linuxcnc-switchkins-remap-table-cached.sh --cache-dir "$preflight_cache_dir" linuxcnc-kinematics-source-files.txt' test-linuxcnc-source-link.sh >/dev/null
 grep -F 'check-linuxcnc-switchkins-remap-table-cached.sh --cache-dir "$preflight_cache_dir" linuxcnc-kinematics-source-files.txt' build-wasm.sh >/dev/null
diff --git a/test-linuxcnc-source-link.sh b/test-linuxcnc-source-link.sh
index 7cf55a0..108c54e 100755
--- a/test-linuxcnc-source-link.sh
+++ b/test-linuxcnc-source-link.sh
@@ -36,6 +36,7 @@ fi
 preflight_cache_dir="$build_dir/preflight-cache"
 LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-inputs-cached.sh --cache-dir "$preflight_cache_dir" "$manifest"
 
+./check-linuxcnc-switchkins-remap-source-map.sh
 LINUXCNC_ROOT="$linuxcnc_root" ./check-linuxcnc-switchkins-remap-table-cached.sh --cache-dir "$preflight_cache_dir" linuxcnc-kinematics-source-files.txt
 # The LinuxCNC source-linked dump path is not concurrency-safe under parallel execution.
 exec 9>"${TMPDIR:-/tmp}/cnc_sim_rs274_source_link.lock"
diff --git a/test-native.sh b/test-native.sh
index 585430c..fa97c20 100755
--- a/test-native.sh
+++ b/test-native.sh
@@ -37,6 +37,7 @@ preflight_cache_dir="$build_dir/preflight-cache"
 ./check-linuxcnc-rs274-source-map.sh
 ./check-linuxcnc-kinematics-source-map.sh
 ./check-linuxcnc-opfs-source-map.sh
+./check-linuxcnc-switchkins-remap-source-map.sh
 ./check-linuxcnc-switchkins-remap-table-cached.sh --cache-dir "$preflight_cache_dir" linuxcnc-kinematics-source-files.txt
 grep -F 'tooldata:src/emc/tooldata/tooldata_nml.cc:NML tool table backend selected by LinuxCNC TOOL_NML_FLAG' linuxcnc-rs274-source-files.txt >/dev/null
 grep -F 'tooldata:src/emc/tooldata/tool_mmap_read.cc:LinuxCNC tooldata mmap reader utility source from tooldata Submakefile' linuxcnc-rs274-source-files.txt >/dev/null