diff --git a/tests/skills/README.md b/tests/skills/README.md
index cf5f7be4..16923a35 100644
--- a/tests/skills/README.md
+++ b/tests/skills/README.md
@@ -233,6 +233,8 @@ ibcmd-проход автоматически `○ skipped`, если рядом
 | `noSnapshot` | нет | Непустая строка с причиной — кейс объявляет, что эталон не нужен (см. «Эталоны») |
 | `idempotent` | нет | `true` — повторный прогон с теми же аргументами должен дать байт-в-байт тот же `workDir` |
 | `runtimeOnly` | нет | `"powershell"` / `"python"` — кейс имеет смысл только на одном порте, на другом `○ skipped` |
+| `osOnly` | нет | `"win32"` / `"darwin"` / `"linux"` — кейс работает только на этой ОС (напр. фейк платформы написан как `.cmd`), на других `○ skipped` |
+| `cwd` | нет | `"workDir"` — запустить навык из рабочего каталога (нужно, если кейс кладёт туда `.v8-project.json`) |
 | `skipValidation` | нет | `true` — не запускать `postValidate` из `_skill.json` (только при `--with-validation`) |
 
 ### Ключи `expect`
diff --git a/tests/skills/cases/db-create/extra-args-from-project.json b/tests/skills/cases/db-create/extra-args-from-project.json
index 81eed912..607c97cb 100644
--- a/tests/skills/cases/db-create/extra-args-from-project.json
+++ b/tests/skills/cases/db-create/extra-args-from-project.json
@@ -25,5 +25,6 @@
   },
   "expectError": true,
   "noSnapshot": "проверяется командная строка в stdout, файлов на выходе нет",
-  "cwd": "workDir"
+  "cwd": "workDir",
+  "osOnly": "win32"
 }
diff --git a/tests/skills/cases/db-create/extra-args-ibcmd-passthrough.json b/tests/skills/cases/db-create/extra-args-ibcmd-passthrough.json
index 5e7275ae..57c5243d 100644
--- a/tests/skills/cases/db-create/extra-args-ibcmd-passthrough.json
+++ b/tests/skills/cases/db-create/extra-args-ibcmd-passthrough.json
@@ -1,13 +1,29 @@
 {
   "name": "Доп. аргументы ibcmd доходят до платформы, секрет замаскирован (fake platform)",
   "preRun": [
-    { "writeFile": { "path": "ibcmd.cmd", "content": "@echo off\r\necho ARGS: %*\r\nexit /b 0\r\n" } }
+    {
+      "writeFile": {
+        "path": "ibcmd.cmd",
+        "content": "@echo off\r\necho ARGS: %*\r\nexit /b 0\r\n"
+      }
+    }
+  ],
+  "args_extra": [
+    "-V8Path",
+    "{workDir}\\ibcmd.cmd",
+    "-InfoBasePath",
+    "{workDir}\\ib",
+    "-AdditionalIbcmdArguments",
+    "--verbose,--token=topsecret"
   ],
-  "args_extra": ["-V8Path", "{workDir}\\ibcmd.cmd", "-InfoBasePath", "{workDir}\\ib",
-                 "-AdditionalIbcmdArguments", "--verbose,--token=topsecret"],
   "expect": {
-    "stdoutContains": ["ARGS: infobase create", "--verbose --token=topsecret", "--token=***"]
+    "stdoutContains": [
+      "ARGS: infobase create",
+      "--verbose --token=topsecret",
+      "--token=***"
+    ]
   },
   "expectError": true,
-  "noSnapshot": "проверяется командная строка в stdout, файлов на выходе нет"
+  "noSnapshot": "проверяется командная строка в stdout, файлов на выходе нет",
+  "osOnly": "win32"
 }
diff --git a/tests/skills/cases/db-create/extra-args-passthrough-py.json b/tests/skills/cases/db-create/extra-args-passthrough-py.json
index 3d5cbb9e..34a148bc 100644
--- a/tests/skills/cases/db-create/extra-args-passthrough-py.json
+++ b/tests/skills/cases/db-create/extra-args-passthrough-py.json
@@ -2,11 +2,25 @@
   "name": "Доп. аргументы 1cv8 попадают в командную строку, py-порт (fake platform)",
   "runtimeOnly": "python",
   "preRun": [
-    { "writeFile": { "path": "fake.cmd", "content": "@echo off\r\necho ARGS: %*\r\nexit /b 0\r\n" } }
+    {
+      "writeFile": {
+        "path": "fake.cmd",
+        "content": "@echo off\r\necho ARGS: %*\r\nexit /b 0\r\n"
+      }
+    }
   ],
-  "args_extra": ["-V8Path", "{workDir}\\fake.cmd", "-InfoBasePath", "{workDir}\\ib",
-                 "-AdditionalV8Arguments", "/UseHwLicenses+"],
-  "expect": { "stdoutContains": "/DisableStartupDialogs /UseHwLicenses+" },
+  "args_extra": [
+    "-V8Path",
+    "{workDir}\\fake.cmd",
+    "-InfoBasePath",
+    "{workDir}\\ib",
+    "-AdditionalV8Arguments",
+    "/UseHwLicenses+"
+  ],
+  "expect": {
+    "stdoutContains": "/DisableStartupDialogs /UseHwLicenses+"
+  },
   "expectError": true,
-  "noSnapshot": "py-порт печатает лог /Out, а не stdout платформы — проверяется строка запуска"
+  "noSnapshot": "py-порт печатает лог /Out, а не stdout платформы — проверяется строка запуска",
+  "osOnly": "win32"
 }
diff --git a/tests/skills/cases/db-create/extra-args-passthrough.json b/tests/skills/cases/db-create/extra-args-passthrough.json
index 48d9e3fc..9e223270 100644
--- a/tests/skills/cases/db-create/extra-args-passthrough.json
+++ b/tests/skills/cases/db-create/extra-args-passthrough.json
@@ -1,12 +1,29 @@
 {
   "name": "Доп. аргументы 1cv8 доходят до платформы (fake platform)",
   "preRun": [
-    { "writeFile": { "path": "fake.cmd", "content": "@echo off\r\necho ARGS: %*\r\nexit /b 0\r\n" } }
+    {
+      "writeFile": {
+        "path": "fake.cmd",
+        "content": "@echo off\r\necho ARGS: %*\r\nexit /b 0\r\n"
+      }
+    }
+  ],
+  "args_extra": [
+    "-V8Path",
+    "{workDir}\\fake.cmd",
+    "-InfoBasePath",
+    "{workDir}\\ib",
+    "-AdditionalV8Arguments",
+    "/UseHwLicenses+"
   ],
-  "args_extra": ["-V8Path", "{workDir}\\fake.cmd", "-InfoBasePath", "{workDir}\\ib",
-                 "-AdditionalV8Arguments", "/UseHwLicenses+"],
   "runtimeOnly": "powershell",
-  "expect": { "stdoutContains": ["ARGS: CREATEINFOBASE", "/DisableStartupDialogs /UseHwLicenses+"] },
+  "expect": {
+    "stdoutContains": [
+      "ARGS: CREATEINFOBASE",
+      "/DisableStartupDialogs /UseHwLicenses+"
+    ]
+  },
   "expectError": true,
-  "noSnapshot": "проверяется командная строка в stdout, файлов на выходе нет"
+  "noSnapshot": "проверяется командная строка в stdout, файлов на выходе нет",
+  "osOnly": "win32"
 }
diff --git a/tests/skills/cases/db-run/extra-args-passthrough.json b/tests/skills/cases/db-run/extra-args-passthrough.json
index e9318709..3e2b896e 100644
--- a/tests/skills/cases/db-run/extra-args-passthrough.json
+++ b/tests/skills/cases/db-run/extra-args-passthrough.json
@@ -1,11 +1,25 @@
 {
   "name": "Доп. аргументы доходят до 1cv8 при строковой склейке (fake platform)",
   "preRun": [
-    { "writeFile": { "path": "fake.cmd", "content": "@echo off\r\necho ARGS: %*\r\nexit /b 1\r\n" } }
+    {
+      "writeFile": {
+        "path": "fake.cmd",
+        "content": "@echo off\r\necho ARGS: %*\r\nexit /b 1\r\n"
+      }
+    }
   ],
-  "args_extra": ["-V8Path", "{workDir}\\fake.cmd", "-InfoBasePath", "{workDir}\\ib",
-                 "-AdditionalV8Arguments", "/ClearCache,/UseHwLicenses+"],
-  "expect": { "stdoutContains": "/DisableStartupDialogs /ClearCache /UseHwLicenses+" },
+  "args_extra": [
+    "-V8Path",
+    "{workDir}\\fake.cmd",
+    "-InfoBasePath",
+    "{workDir}\\ib",
+    "-AdditionalV8Arguments",
+    "/ClearCache,/UseHwLicenses+"
+  ],
+  "expect": {
+    "stdoutContains": "/DisableStartupDialogs /ClearCache /UseHwLicenses+"
+  },
   "expectError": true,
-  "noSnapshot": "проверяется командная строка в stdout, файлов на выходе нет"
+  "noSnapshot": "проверяется командная строка в stdout, файлов на выходе нет",
+  "osOnly": "win32"
 }
diff --git a/tests/skills/cases/epf-build/extra-args-stub-chain.json b/tests/skills/cases/epf-build/extra-args-stub-chain.json
index 842785bb..ea24c621 100644
--- a/tests/skills/cases/epf-build/extra-args-stub-chain.json
+++ b/tests/skills/cases/epf-build/extra-args-stub-chain.json
@@ -1,13 +1,29 @@
 {
   "name": "Доп. аргументы уходят и во временную базу, и в сборку (fake platform)",
   "preRun": [
-    { "writeFile": { "path": "fake.cmd", "content": "@echo off\r\necho ARGS: %*\r\nexit /b 0\r\n" } },
-    { "writeFile": { "path": "src/Обработка.xml", "content": "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<MetaDataObject xmlns=\"http://v8.1c.ru/8.3/MDClasses\"/>\n" } }
+    {
+      "writeFile": {
+        "path": "fake.cmd",
+        "content": "@echo off\r\necho ARGS: %*\r\nexit /b 0\r\n"
+      }
+    },
+    {
+      "writeFile": {
+        "path": "src/Обработка.xml",
+        "content": "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<MetaDataObject xmlns=\"http://v8.1c.ru/8.3/MDClasses\"/>\n"
+      }
+    }
+  ],
+  "args_extra": [
+    "-V8Path",
+    "{workDir}\\fake.cmd",
+    "-SourceFile",
+    "{workDir}\\src\\Обработка.xml",
+    "-OutputFile",
+    "{workDir}\\build\\Обработка.epf",
+    "-AdditionalV8Arguments",
+    "/UseHwLicenses+"
   ],
-  "args_extra": ["-V8Path", "{workDir}\\fake.cmd",
-                 "-SourceFile", "{workDir}\\src\\Обработка.xml",
-                 "-OutputFile", "{workDir}\\build\\Обработка.epf",
-                 "-AdditionalV8Arguments", "/UseHwLicenses+"],
   "runtimeOnly": "powershell",
   "expect": {
     "stdoutContains": [
@@ -18,5 +34,6 @@
     ]
   },
   "expectError": true,
-  "noSnapshot": "проверяются командные строки в stdout, платформа фейковая — EPF не создаётся"
+  "noSnapshot": "проверяются командные строки в stdout, платформа фейковая — EPF не создаётся",
+  "osOnly": "win32"
 }
diff --git a/tests/skills/runner.mjs b/tests/skills/runner.mjs
index 5666a92e..b1994f47 100644
--- a/tests/skills/runner.mjs
+++ b/tests/skills/runner.mjs
@@ -588,6 +588,12 @@ async function runCaseAsync(testCase, opts) {
   let workDir = null;
   let inputFile = null;
 
+  // osOnly: gate a case to one OS (e.g. a fake platform written as a .cmd cannot run on
+  // macOS/Linux at all, whatever the port). Values are process.platform strings.
+  if (caseData.osOnly && caseData.osOnly !== process.platform) {
+    return { id: testCase.id, skill: testCase.skillDir, name: testCase.name, passed: true, skipped: true, errors: [], elapsed: '0.0s' };
+  }
+
   // runtimeOnly: gate a case to a single port (e.g. a .cmd fake platform only runs via
   // PowerShell's Start-Process; python's list-exec can't launch it). Skipped elsewhere.
   if (caseData.runtimeOnly && caseData.runtimeOnly !== opts.runtime) {