diff --git a/.spectral.yaml b/.spectral.yaml
index 2d5df7f..769a33d 100644
--- a/.spectral.yaml
+++ b/.spectral.yaml
@@ -107,4 +107,11 @@ rules:
     then:
       function: length
       functionOptions:
-        max: 95
\ No newline at end of file
+        max: 95
+
+  must-not-use-base-server-url:
+    description: "Must not use base server url in spec to be able to generate a single client compatible with multiple environments."
+    severity: warn
+    given: $.servers[*].url
+    then:
+      function: falsy
\ No newline at end of file
diff --git a/TestSpecs/must-not-use-base-server-url-invalid.yaml b/TestSpecs/must-not-use-base-server-url-invalid.yaml
new file mode 100644
index 0000000..e101d71
--- /dev/null
+++ b/TestSpecs/must-not-use-base-server-url-invalid.yaml
@@ -0,0 +1,16 @@
+openapi: 3.0.1
+info:
+  title: V1 API General
+  version: v1
+servers:
+  - url: https://api.example.com/v1
+paths:
+  /buy-item:
+    post:
+      tags:
+        - Shop
+      summary: Buy an item
+      operationId: BuyItem
+      responses:
+        '200':
+          description: Success
diff --git a/TestSpecs/must-not-use-base-server-url-valid.yaml b/TestSpecs/must-not-use-base-server-url-valid.yaml
new file mode 100644
index 0000000..1eec9b5
--- /dev/null
+++ b/TestSpecs/must-not-use-base-server-url-valid.yaml
@@ -0,0 +1,14 @@
+openapi: 3.0.1
+info:
+  title: V1 API General
+  version: v1
+paths:
+  /buy-item:
+    post:
+      tags:
+        - Shop
+      summary: Buy an item
+      operationId: BuyItem
+      responses:
+        '200':
+          description: Success
diff --git a/test.ps1 b/test.ps1
index 1805f81..c59bdfc 100644
--- a/test.ps1
+++ b/test.ps1
@@ -12,6 +12,8 @@ $tests = @(
     @{ rule = "items-must-have-a-type"; expectError = $true; filename = "items-must-have-a-type-invalid.yaml" },
     @{ rule = "must-accept-content-types"; expectError = $false; filename = "must-accept-content-types-valid.yaml" },
     @{ rule = "must-accept-content-types"; expectError = $true; filename = "must-accept-content-types-invalid.yaml" },
+    @{ rule = "must-not-use-base-server-url"; expectError = $false; filename = "must-not-use-base-server-url-valid.yaml" },
+    @{ rule = "must-not-use-base-server-url"; expectError = $true; filename = "must-not-use-base-server-url-invalid.yaml" },
     @{ rule = "must-return-content-types"; expectError = $false; filename = "must-return-content-types-valid.yaml" },
     @{ rule = "must-return-content-types"; expectError = $true; filename = "must-return-content-types-invalid.yaml" },
     @{ rule = "must-support-client-credentials-oauth2"; expectError = $false; filename = "must-support-client-credentials-oauth2-valid.yaml" },