diff --git a/package-lock.json b/package-lock.json
index a4b1c63..c5de1d0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,16 +1,18 @@
 {
   "name": "codesys-mcp-sp21-plus",
-  "version": "0.4.9",
+  "version": "0.5.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "codesys-mcp-sp21-plus",
-      "version": "0.4.9",
+      "version": "0.5.0",
       "license": "MIT",
       "dependencies": {
         "@modelcontextprotocol/sdk": "^1.26.0",
         "commander": "^11.1.0",
+        "ink": "^5.2.1",
+        "react": "^18.3.1",
         "ssh2": "^1.17.0",
         "uuid": "^9.0.0",
         "zod": "^3.24.3"
@@ -19,9 +21,13 @@
         "codesys-mcp-sp21-plus": "dist/bin.js"
       },
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+        "@types/react": "^18.3.28",
         "@types/ssh2": "^1.15.5",
         "@types/uuid": "^9.0.0",
+        "diff": "^5.2.2",
+        "ink-testing-library": "^4.0.0",
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         "typescript": "^5.5.3",
         "vitest": "^1.6.0"
@@ -30,6 +36,31 @@
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+      "resolved": "https://registry.npmjs.org/@alcalzone/ansi-tokenize/-/ansi-tokenize-0.1.3.tgz",
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+      "license": "MIT",
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+        "is-fullwidth-code-point": "^4.0.0"
+      },
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+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-6.2.3.tgz",
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+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
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@@ -958,6 +989,13 @@
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       "license": "MIT"
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+      "resolved": "https://registry.npmjs.org/@types/diff/-/diff-5.2.3.tgz",
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@@ -975,6 +1013,24 @@
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+      "resolved": "https://registry.npmjs.org/@types/prop-types/-/prop-types-15.7.15.tgz",
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+      "license": "MIT"
+    },
+    "node_modules/@types/react": {
+      "version": "18.3.28",
+      "resolved": "https://registry.npmjs.org/@types/react/-/react-18.3.28.tgz",
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+      "devOptional": true,
+      "license": "MIT",
+      "dependencies": {
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+        "csstype": "^3.2.2"
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       "resolved": "https://registry.npmjs.org/@types/ssh2/-/ssh2-1.15.5.tgz",
@@ -1155,6 +1211,33 @@
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+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-7.3.0.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "environment": "^1.0.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
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+    "node_modules/ansi-regex": {
+      "version": "6.2.2",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-6.2.2.tgz",
+      "integrity": "sha512-Bq3SmSpyFHaWjPk8If9yc6svM8c56dB5BAtW4Qbw5jHTwwXXcTLoRMkpDJp6VL0XzlWaCHTXrkFURMYmD0sLqg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-regex?sponsor=1"
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       "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-5.2.0.tgz",
@@ -1187,6 +1270,18 @@
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+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/auto-bind/-/auto-bind-5.0.1.tgz",
+      "integrity": "sha512-ooviqdwwgfIfNmDwo94wlshcdzfO64XV0Cg6oDsDYBJfITDz1EngD2z7DkbvCWn+XIMsIqW27sEVF6qcpJrRcg==",
+      "license": "MIT",
+      "engines": {
+        "node": "^12.20.0 || ^14.13.1 || >=16.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
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@@ -1296,6 +1391,18 @@
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+    "node_modules/chalk": {
+      "version": "5.6.2",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-5.6.2.tgz",
+      "integrity": "sha512-7NzBL0rN6fMUW+f7A6Io4h40qQlG+xGmtMxfbnH/K7TAtt8JQWVQK+6g0UXKMeVJoyV5EkkNsErQ8pVD3bLHbA==",
+      "license": "MIT",
+      "engines": {
+        "node": "^12.17.0 || ^14.13 || >=16.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/chalk?sponsor=1"
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       "resolved": "https://registry.npmjs.org/check-error/-/check-error-1.0.3.tgz",
@@ -1309,6 +1416,89 @@
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+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/cli-boxes/-/cli-boxes-3.0.0.tgz",
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+      "license": "MIT",
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
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+    "node_modules/cli-cursor": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-4.0.0.tgz",
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+      "dependencies": {
+        "restore-cursor": "^4.0.0"
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+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
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+    "node_modules/cli-truncate": {
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+      "resolved": "https://registry.npmjs.org/cli-truncate/-/cli-truncate-4.0.0.tgz",
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+        "string-width": "^7.0.0"
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+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
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+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-6.2.3.tgz",
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+      "license": "MIT",
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+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
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+      "resolved": "https://registry.npmjs.org/slice-ansi/-/slice-ansi-5.0.0.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "ansi-styles": "^6.0.0",
+        "is-fullwidth-code-point": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/slice-ansi?sponsor=1"
+      }
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+    "node_modules/code-excerpt": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/code-excerpt/-/code-excerpt-4.0.0.tgz",
+      "integrity": "sha512-xxodCmBen3iy2i0WtAK8FlFNrRzjUqjRsMfho58xT/wvZU1YTM3fCnRjcy1gJPMepaRlgm/0e6w8SpWHpn3/cA==",
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+      "dependencies": {
+        "convert-to-spaces": "^2.0.1"
+      },
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       "resolved": "https://registry.npmjs.org/commander/-/commander-11.1.0.tgz",
@@ -1347,6 +1537,15 @@
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+    "node_modules/convert-to-spaces": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/convert-to-spaces/-/convert-to-spaces-2.0.1.tgz",
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+      "license": "MIT",
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@@ -1410,6 +1609,13 @@
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+      "resolved": "https://registry.npmjs.org/csstype/-/csstype-3.2.3.tgz",
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@@ -1449,6 +1655,16 @@
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+      "resolved": "https://registry.npmjs.org/diff/-/diff-5.2.2.tgz",
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+      "license": "BSD-3-Clause",
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       "license": "MIT"
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+    "node_modules/emoji-regex": {
+      "version": "10.6.0",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-10.6.0.tgz",
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@@ -1488,6 +1710,18 @@
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+      "resolved": "https://registry.npmjs.org/environment/-/environment-1.1.0.tgz",
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+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
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@@ -1518,6 +1752,16 @@
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+      "resolved": "https://registry.npmjs.org/es-toolkit/-/es-toolkit-1.46.0.tgz",
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+      "license": "MIT",
+      "workspaces": [
+        "docs",
+        "benchmarks"
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       "license": "MIT"
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+      "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-2.0.0.tgz",
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+      "license": "MIT",
+      "engines": {
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@@ -1773,6 +2026,18 @@
         "url": "https://github.com/sponsors/ljharb"
       }
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+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
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@@ -1937,12 +2202,108 @@
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@@ -2299,6 +2705,15 @@
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+      "license": "MIT",
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@@ -2466,6 +2881,18 @@
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@@ -2473,6 +2900,22 @@
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@@ -2492,6 +2935,52 @@
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+      "license": "MIT",
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+        "signal-exit": "^3.0.2"
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+      "license": "MIT",
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+      "funding": {
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+    },
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@@ -2559,6 +3048,15 @@
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+    "node_modules/scheduler": {
+      "version": "0.23.2",
+      "resolved": "https://registry.npmjs.org/scheduler/-/scheduler-0.23.2.tgz",
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+      "license": "MIT",
+      "dependencies": {
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+      }
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@@ -2723,6 +3221,49 @@
         "url": "https://github.com/sponsors/isaacs"
       }
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+    "node_modules/slice-ansi": {
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+      "resolved": "https://registry.npmjs.org/slice-ansi/-/slice-ansi-7.1.2.tgz",
+      "integrity": "sha512-iOBWFgUX7caIZiuutICxVgX1SdxwAVFFKwt1EvMYYec/NWO5meOJ6K5uQxhrYBdQJne4KxiqZc+KptFOWFSI9w==",
+      "license": "MIT",
+      "dependencies": {
+        "ansi-styles": "^6.2.1",
+        "is-fullwidth-code-point": "^5.0.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/slice-ansi?sponsor=1"
+      }
+    },
+    "node_modules/slice-ansi/node_modules/ansi-styles": {
+      "version": "6.2.3",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-6.2.3.tgz",
+      "integrity": "sha512-4Dj6M28JB+oAH8kFkTLUo+a2jwOFkuqb3yucU0CANcRRUbxS0cP0nZYCGjcc3BNXwRIsUVmDGgzawme7zvJHvg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
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+    "node_modules/slice-ansi/node_modules/is-fullwidth-code-point": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-5.1.0.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "get-east-asian-width": "^1.3.1"
+      },
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+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
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       "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.2.1.tgz",
@@ -2750,6 +3291,18 @@
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+      "resolved": "https://registry.npmjs.org/stack-utils/-/stack-utils-2.0.6.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "escape-string-regexp": "^2.0.0"
+      },
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       "version": "0.0.2",
       "resolved": "https://registry.npmjs.org/stackback/-/stackback-0.0.2.tgz",
@@ -2773,6 +3326,38 @@
       "dev": true,
       "license": "MIT"
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+    "node_modules/string-width": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-7.2.0.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "emoji-regex": "^10.3.0",
+        "get-east-asian-width": "^1.0.0",
+        "strip-ansi": "^7.1.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
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+    "node_modules/strip-ansi": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-7.2.0.tgz",
+      "integrity": "sha512-yDPMNjp4WyfYBkHnjIRLfca1i6KMyGCtsVgoKe/z1+6vukgaENdgGBZt+ZmKPc4gavvEZ5OgHfHdrazhgNyG7w==",
+      "license": "MIT",
+      "dependencies": {
+        "ansi-regex": "^6.2.2"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/strip-ansi?sponsor=1"
+      }
+    },
     "node_modules/strip-final-newline": {
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       "resolved": "https://registry.npmjs.org/strip-final-newline/-/strip-final-newline-3.0.0.tgz",
@@ -3304,6 +3889,18 @@
         "node": ">=4"
       }
     },
+    "node_modules/type-fest": {
+      "version": "4.41.0",
+      "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-4.41.0.tgz",
+      "integrity": "sha512-TeTSQ6H5YHvpqVwBRcnLDCBnDOHWYu7IvGbHT6N8AOymcr9PJGjc1GTtiWZTYg0NCgYwvnYWEkVChQAr9bjfwA==",
+      "license": "(MIT OR CC0-1.0)",
+      "engines": {
+        "node": ">=16"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
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+    },
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       "resolved": "https://registry.npmjs.org/type-is/-/type-is-2.0.1.tgz",
@@ -3558,12 +4155,77 @@
         "node": ">=8"
       }
     },
+    "node_modules/widest-line": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/widest-line/-/widest-line-5.0.0.tgz",
+      "integrity": "sha512-c9bZp7b5YtRj2wOe6dlj32MK+Bx/M/d+9VB2SHM1OtsUHR0aV0tdP6DWh/iMt0kWi1t5g1Iudu6hQRNd1A4PVA==",
+      "license": "MIT",
+      "dependencies": {
+        "string-width": "^7.0.0"
+      },
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+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/wrap-ansi": {
+      "version": "9.0.2",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-9.0.2.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "ansi-styles": "^6.2.1",
+        "string-width": "^7.0.0",
+        "strip-ansi": "^7.1.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
+      }
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+    "node_modules/wrap-ansi/node_modules/ansi-styles": {
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+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-6.2.3.tgz",
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+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
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     "node_modules/wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
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       "license": "ISC"
     },
+    "node_modules/ws": {
+      "version": "8.20.0",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.20.0.tgz",
+      "integrity": "sha512-sAt8BhgNbzCtgGbt2OxmpuryO63ZoDk/sqaB/znQm94T4fCEsy/yV+7CdC1kJhOU9lboAEU7R3kquuycDoibVA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=10.0.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": ">=5.0.2"
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+        "bufferutil": {
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+        },
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     "node_modules/yocto-queue": {
       "version": "1.2.2",
       "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-1.2.2.tgz",
@@ -3577,6 +4239,12 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/yoga-layout": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/yoga-layout/-/yoga-layout-3.2.1.tgz",
+      "integrity": "sha512-0LPOt3AxKqMdFBZA3HBAt/t/8vIKq7VaQYbuA8WxCgung+p9TVyKRYdpvCb80HcdTN2NkbIKbhNwKUfm3tQywQ==",
+      "license": "MIT"
+    },
     "node_modules/zod": {
       "version": "3.25.76",
       "resolved": "https://registry.npmjs.org/zod/-/zod-3.25.76.tgz",
diff --git a/package.json b/package.json
index c0a5718..e5654a3 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,8 @@
   "description": "Codesys-MCP-SP21+ -- fork of luke-harriman/Codesys-MCP carrying CODESYS V3.5 SP22 Patch 1 fixes (and forward-compat with later SPs): script-engine API drift, online/runtime tool auto-login, dual-SHA release classifier, set_pou_code omitted-decl wipe fix, add_library managed-overload, etc. MCP server for CODESYS with persistent UI instance and file-based IPC.",
   "main": "dist/server.js",
   "bin": {
-    "codesys-mcp-sp21-plus": "dist/bin.js"
+    "codesys-mcp-sp21-plus": "dist/bin.js",
+    "phobiCS-tui": "dist/tui/index.js"
   },
   "files": [
     "dist/",
@@ -12,10 +13,11 @@
     "LICENSE"
   ],
   "scripts": {
-    "build": "tsc && node -e \"require('fs').cpSync('src/scripts','dist/scripts',{recursive:true})\"",
+    "build": "tsc && tsc -p tsconfig.tui.json && node -e \"require('fs').cpSync('src/scripts','dist/scripts',{recursive:true})\" && node -e \"const fs=require('fs');fs.writeFileSync('dist/tui/package.json','{\\\"type\\\":\\\"module\\\"}');const p='dist/tui/index.js';fs.writeFileSync(p,'#!/usr/bin/env node\\n'+fs.readFileSync(p,'utf8'));\"",
+    "build:tui": "tsc -p tsconfig.tui.json",
     "test": "vitest --run",
     "test:watch": "vitest",
-    "typecheck": "tsc --noEmit",
+    "typecheck": "tsc --noEmit && tsc -p tsconfig.tui.json --noEmit",
     "prepublishOnly": "npm run build && npm test"
   },
   "keywords": [
@@ -39,14 +41,20 @@
   "dependencies": {
     "@modelcontextprotocol/sdk": "^1.26.0",
     "commander": "^11.1.0",
+    "ink": "^5.2.1",
+    "react": "^18.3.1",
     "ssh2": "^1.17.0",
     "uuid": "^9.0.0",
     "zod": "^3.24.3"
   },
   "devDependencies": {
+    "@types/diff": "^5.2.3",
     "@types/node": "^20.14.1",
+    "@types/react": "^18.3.28",
     "@types/ssh2": "^1.15.5",
     "@types/uuid": "^9.0.0",
+    "diff": "^5.2.2",
+    "ink-testing-library": "^4.0.0",
     "tsx": "^4.21.0",
     "typescript": "^5.5.3",
     "vitest": "^1.6.0"
diff --git a/src/tui/index.tsx b/src/tui/index.tsx
new file mode 100644
index 0000000..7b99d3b
--- /dev/null
+++ b/src/tui/index.tsx
@@ -0,0 +1,12 @@
+import React from 'react';
+import { render } from 'ink';
+import { Text } from 'ink';
+
+const argv = process.argv.slice(2);
+
+if (argv[0] === '--version' || argv[0] === '-v') {
+  process.stdout.write('phobiCS-tui v0.1.0\n');
+  process.exit(0);
+}
+
+render(<Text>phobiCS-tui — coming soon</Text>);
diff --git a/src/tui/package.json b/src/tui/package.json
new file mode 100644
index 0000000..3dbc1ca
--- /dev/null
+++ b/src/tui/package.json
@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}
diff --git a/tsconfig.json b/tsconfig.json
index 434c423..765dfbb 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -14,5 +14,5 @@
     "sourceMap": true
   },
   "include": ["src/**/*"],
-  "exclude": ["node_modules", "dist", "tests"]
+  "exclude": ["node_modules", "dist", "tests", "src/tui"]
 }
diff --git a/tsconfig.tui.json b/tsconfig.tui.json
new file mode 100644
index 0000000..395ddd0
--- /dev/null
+++ b/tsconfig.tui.json
@@ -0,0 +1,19 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ES2022",
+    "moduleResolution": "bundler",
+    "outDir": "dist/tui",
+    "rootDir": "src/tui",
+    "jsx": "react",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "resolveJsonModule": true,
+    "declaration": false,
+    "sourceMap": true
+  },
+  "include": ["src/tui/**/*"],
+  "exclude": ["node_modules", "dist", "tests"]
+}