diff --git a/package.json b/package.json
index 1d824d7..5856e9e 100644
--- a/package.json
+++ b/package.json
@@ -146,6 +146,14 @@
             "Pkl 0.25 - 0.29",
             "Pkl 0.30+"
           ]
+        },
+        "pkl.projects.excludedDirectories": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          },
+          "default": [],
+          "description": "List of directories to exclude when discovering Pkl projects. Supports glob patterns (* and **)."
         }
       }
     },
diff --git a/src/ts/consts.ts b/src/ts/consts.ts
index 9359f7a..70ef0a1 100644
--- a/src/ts/consts.ts
+++ b/src/ts/consts.ts
@@ -1,5 +1,5 @@
 /*
- * Copyright © 2024-2025 Apple Inc. and the Pkl project authors. All rights reserved.
+ * Copyright © 2024-2026 Apple Inc. and the Pkl project authors. All rights reserved.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -30,6 +30,9 @@ export const CONFIG_LSP_DEBUG_PORT = "pkl.lsp.debug.port";
 // only used by the LSP server
 export const CONFIG_CLI_PATH = "pkl.cli.path";
 
+// only used by the LSP server
+export const CONFIG_PROJECTS_EXCLUDED_DIRECTORIES = "pkl.projects.excludedDirectories";
+
 export const COMMAND_DOWNLOAD_PACKAGE = "pkl.downloadPackage";
 
 export const COMMAND_PKL_OPEN_FILE = "pkl.open.file";