diff --git a/mcp_student.go b/mcp_student.go
index 3deac57..d5e32b1 100644
--- a/mcp_student.go
+++ b/mcp_student.go
@@ -199,7 +199,7 @@ func studentTools() []pact.MCPTool {
 		{
 			Name:        "pin_material",
 			Title:       "Pin a material",
-			Description: "Pins a material the signed-in student may see, for this student only (nobody else sees the pin): bm_materials without q then lists it first, newest pin first, and the material answers carry pinned true. Pinning again keeps the first pin time. Answers with no content; a material the student cannot see is not found." + needsScopeWrite,
+			Description: "Pins a material the signed-in student may see, for this student only (nobody else sees the pin): bm_materials without q then lists it first, newest pin first, and the material answers carry pinned true. Pinning again keeps the first pin time. Answers with no content; a material the student cannot see is not found. " + MCPMaterialPrivacy + needsScopeWrite,
 			Guard:       "user",
 			Method:      http.MethodPut,
 			Path:        TokenPrefix + "/materials/{id}/pin",
@@ -208,7 +208,7 @@ func studentTools() []pact.MCPTool {
 		{
 			Name:        "unpin_material",
 			Title:       "Unpin a material",
-			Description: "Removes the signed-in student's own pin from a material (it can be pinned again); unpinning a material that is not pinned is not an error. Answers with no content." + needsScopeWrite,
+			Description: "Removes the signed-in student's own pin from a material (it can be pinned again); unpinning a material that is not pinned is not an error. Answers with no content. " + MCPMaterialPrivacy + needsScopeWrite,
 			Guard:       "user",
 			Method:      http.MethodDelete,
 			Path:        TokenPrefix + "/materials/{id}/pin",