diff --git a/tests/skills/cases/db-create/extra-args-conflict.json b/tests/skills/cases/db-create/extra-args-conflict.json
index 0ced8ad1..5c897560 100644
--- a/tests/skills/cases/db-create/extra-args-conflict.json
+++ b/tests/skills/cases/db-create/extra-args-conflict.json
@@ -4,7 +4,7 @@
     { "writeFile": { "path": "fake.cmd", "content": "@echo off\r\nexit /b 0\r\n" } }
   ],
   "args_extra": ["-V8Path", "{workDir}\\fake.cmd", "-InfoBasePath", "{workDir}\\ib",
-                 "-AdditionalV8Arguments", "/F", "C:\\tmp"],
+                 "-AdditionalV8Arguments", "/F,C:\\tmp"],
   "expectError": true,
   "noSnapshot": "негативный кейс: платформа не запускается"
 }
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 5d68ccf1..81eed912 100644
--- a/tests/skills/cases/db-create/extra-args-from-project.json
+++ b/tests/skills/cases/db-create/extra-args-from-project.json
@@ -1,11 +1,29 @@
 {
   "name": "Доп. аргументы берутся из v8args в .v8-project.json (fake platform)",
   "preRun": [
-    { "writeFile": { "path": "fake.cmd", "content": "@echo off\r\necho ARGS: %*\r\nexit /b 0\r\n" } },
-    { "writeFile": { "path": ".v8-project.json", "content": "{\n  \"v8path\": \"fake\",\n  \"v8args\": [\"/UseHwLicenses+\"],\n  \"ibcmdargs\": [\"--verbose\"]\n}\n" } }
+    {
+      "writeFile": {
+        "path": "fake.cmd",
+        "content": "@echo off\r\necho ARGS: %*\r\nexit /b 0\r\n"
+      }
+    },
+    {
+      "writeFile": {
+        "path": ".v8-project.json",
+        "content": "{\n  \"v8path\": \"fake\",\n  \"v8args\": [\"/UseHwLicenses+\"],\n  \"ibcmdargs\": [\"--verbose\"]\n}\n"
+      }
+    }
   ],
-  "args_extra": ["-V8Path", "{workDir}\\fake.cmd", "-InfoBasePath", "{workDir}\\ib"],
-  "expect": { "stdoutContains": "/DisableStartupDialogs /UseHwLicenses+" },
+  "args_extra": [
+    "-V8Path",
+    "{workDir}\\fake.cmd",
+    "-InfoBasePath",
+    "{workDir}\\ib"
+  ],
+  "expect": {
+    "stdoutContains": "/DisableStartupDialogs /UseHwLicenses+"
+  },
   "expectError": true,
-  "noSnapshot": "проверяется командная строка в stdout, файлов на выходе нет"
+  "noSnapshot": "проверяется командная строка в stdout, файлов на выходе нет",
+  "cwd": "workDir"
 }
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 43f1c372..5e7275ae 100644
--- a/tests/skills/cases/db-create/extra-args-ibcmd-passthrough.json
+++ b/tests/skills/cases/db-create/extra-args-ibcmd-passthrough.json
@@ -4,7 +4,7 @@
     { "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"],
+                 "-AdditionalIbcmdArguments", "--verbose,--token=topsecret"],
   "expect": {
     "stdoutContains": ["ARGS: infobase create", "--verbose --token=topsecret", "--token=***"]
   },
diff --git a/tests/skills/cases/db-create/extra-args-passthrough-py.json b/tests/skills/cases/db-create/extra-args-passthrough-py.json
new file mode 100644
index 00000000..3d5cbb9e
--- /dev/null
+++ b/tests/skills/cases/db-create/extra-args-passthrough-py.json
@@ -0,0 +1,12 @@
+{
+  "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" } }
+  ],
+  "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"
+}
diff --git a/tests/skills/cases/db-create/extra-args-passthrough.json b/tests/skills/cases/db-create/extra-args-passthrough.json
index db186002..48d9e3fc 100644
--- a/tests/skills/cases/db-create/extra-args-passthrough.json
+++ b/tests/skills/cases/db-create/extra-args-passthrough.json
@@ -5,6 +5,7 @@
   ],
   "args_extra": ["-V8Path", "{workDir}\\fake.cmd", "-InfoBasePath", "{workDir}\\ib",
                  "-AdditionalV8Arguments", "/UseHwLicenses+"],
+  "runtimeOnly": "powershell",
   "expect": { "stdoutContains": ["ARGS: CREATEINFOBASE", "/DisableStartupDialogs /UseHwLicenses+"] },
   "expectError": true,
   "noSnapshot": "проверяется командная строка в stdout, файлов на выходе нет"
diff --git a/tests/skills/cases/db-run/extra-args-passthrough.json b/tests/skills/cases/db-run/extra-args-passthrough.json
index 8f402c79..e9318709 100644
--- a/tests/skills/cases/db-run/extra-args-passthrough.json
+++ b/tests/skills/cases/db-run/extra-args-passthrough.json
@@ -4,7 +4,7 @@
     { "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+"],
+                 "-AdditionalV8Arguments", "/ClearCache,/UseHwLicenses+"],
   "expect": { "stdoutContains": "/DisableStartupDialogs /ClearCache /UseHwLicenses+" },
   "expectError": true,
   "noSnapshot": "проверяется командная строка в stdout, файлов на выходе нет"
diff --git a/tests/skills/cases/xdto-validate/facet-conflicts.json b/tests/skills/cases/xdto-validate/facet-conflicts.json
index 95b15286..0e8628e7 100644
--- a/tests/skills/cases/xdto-validate/facet-conflicts.json
+++ b/tests/skills/cases/xdto-validate/facet-conflicts.json
@@ -8,7 +8,7 @@
   "expectError": true,
   "expect": {
     "stdoutContains": [
-      "length несовместим с minLength/maxLength",
+      "length задан вместе с minLength/maxLength",
       "minLength (3) больше maxLength (2)",
       "fractionDigits (9) больше totalDigits (5)"
     ]
diff --git a/tests/skills/runner.mjs b/tests/skills/runner.mjs
index 0a1cf73d..5666a92e 100644
--- a/tests/skills/runner.mjs
+++ b/tests/skills/runner.mjs
@@ -653,7 +653,7 @@ async function runCaseAsync(testCase, opts) {
     const { scriptPath, args } = buildArgs(skillConfig, caseData, workDir, inputFile, opts.runtime);
     let stdout = '', stderr = '', exitCode = 0;
     try {
-      const execCwd = skillConfig.cwd === 'workDir' ? workDir : undefined;
+      const execCwd = (caseData.cwd || skillConfig.cwd) === 'workDir' ? workDir : undefined;
       stdout = await execSkillAsync(opts.runtime, scriptPath, args, execCwd);
     } catch (e) {
       exitCode = e.status ?? 1;
@@ -679,6 +679,10 @@ async function runCaseAsync(testCase, opts) {
           if (!existsSync(join(workDir, f))) errors.push(`Expected file not found: ${f}`);
         }
       }
+    }
+    // stdout checks apply to negative cases too — a case that says what the failure must
+    // print was silently checking nothing when they lived in the positive branch only.
+    {
       if (caseData.expect?.stdoutContains) {
         const needles = Array.isArray(caseData.expect.stdoutContains)
           ? caseData.expect.stdoutContains : [caseData.expect.stdoutContains];
@@ -693,6 +697,8 @@ async function runCaseAsync(testCase, opts) {
           if (stdout.includes(needle)) errors.push(`stdout unexpectedly contains "${needle}"`);
         }
       }
+    }
+    if (!caseData.expectError) {
       if (caseData.expect?.preserves) {
         const specs = Array.isArray(caseData.expect.preserves)
           ? caseData.expect.preserves : [caseData.expect.preserves];
@@ -713,7 +719,7 @@ async function runCaseAsync(testCase, opts) {
       if (errors.length === 0 && caseData.idempotent && !workspace.readOnly) {
         const before = snapshotWorkDirBytes(workDir);
         try {
-          const execCwd = skillConfig.cwd === 'workDir' ? workDir : undefined;
+          const execCwd = (caseData.cwd || skillConfig.cwd) === 'workDir' ? workDir : undefined;
           await execSkillAsync(opts.runtime, scriptPath, args, execCwd);
         } catch (e) {
           errors.push(`Idempotency rerun failed: exitCode=${e.status}\nstderr: ${(e.stderr || '').substring(0, 300)}`);
@@ -835,7 +841,7 @@ function runCase(testCase, opts) {
     let stdout = '', stderr = '', exitCode = 0;
 
     try {
-      const execCwd = skillConfig.cwd === 'workDir' ? workDir : undefined;
+      const execCwd = (caseData.cwd || skillConfig.cwd) === 'workDir' ? workDir : undefined;
       stdout = execSkillRaw(opts.runtime, scriptPath, args, execCwd);
     } catch (e) {
       exitCode = e.status ?? 1;
@@ -871,8 +877,12 @@ function runCase(testCase, opts) {
           }
         }
       }
+    }
 
-      // expect.stdoutContains / stdoutNotContains (string or array)
+    // expect.stdoutContains / stdoutNotContains (string or array) — applies to negative
+    // cases too: a case that says what the failure must print was silently checking
+    // nothing while these lived in the positive branch only.
+    {
       if (caseData.expect?.stdoutContains) {
         const needles = Array.isArray(caseData.expect.stdoutContains)
           ? caseData.expect.stdoutContains : [caseData.expect.stdoutContains];
@@ -887,6 +897,9 @@ function runCase(testCase, opts) {
           if (stdout.includes(needle)) errors.push(`stdout unexpectedly contains "${needle}"`);
         }
       }
+    }
+
+    if (!caseData.expectError) {
       if (caseData.expect?.preserves) {
         const specs = Array.isArray(caseData.expect.preserves)
           ? caseData.expect.preserves : [caseData.expect.preserves];
@@ -908,7 +921,7 @@ function runCase(testCase, opts) {
       if (errors.length === 0 && caseData.idempotent && !workspace.readOnly) {
         const before = snapshotWorkDirBytes(workDir);
         try {
-          const execCwd = skillConfig.cwd === 'workDir' ? workDir : undefined;
+          const execCwd = (caseData.cwd || skillConfig.cwd) === 'workDir' ? workDir : undefined;
           execSkillRaw(opts.runtime, scriptPath, args, execCwd);
         } catch (e) {
           errors.push(`Idempotency rerun failed: exitCode=${e.status}\nstderr: ${(e.stderr || '').substring(0, 300)}`);