diff --git a/server.py b/server.py
index 3e71f80..c812e7c 100644
--- a/server.py
+++ b/server.py
@@ -1135,7 +1135,7 @@ TOOLS = [
                 "references": {"type": "string"},
                 "signature_vars": {
                     "type": "object",
-                    "description": "Optional identity variables for signature template (NAME, TITLE, PHONE, ADDRESS, EMAIL)",
+                    "description": "Optional: LLM identity details to populate the email signature template. Use this to provide your NAME, TITLE, PHONE, ADDRESS, and EMAIL as the sender.",
                     "properties": {
                         "NAME": {"type": "string"},
                         "TITLE": {"type": "string"},
@@ -1164,7 +1164,7 @@ TOOLS = [
                 "bcc": {"type": "array", "items": {"type": "string"}},
                 "signature_vars": {
                     "type": "object",
-                    "description": "Optional identity variables for signature template (NAME, TITLE, PHONE, ADDRESS, EMAIL)",
+                    "description": "Optional: LLM identity details to populate the email signature template. Use this to provide your NAME, TITLE, PHONE, ADDRESS, and EMAIL as the sender.",
                     "properties": {
                         "NAME": {"type": "string"},
                         "TITLE": {"type": "string"},
@@ -1193,7 +1193,7 @@ TOOLS = [
                 "html": {"type": "boolean", "description": "Treat body as HTML (default: true)"},
                 "signature_vars": {
                     "type": "object",
-                    "description": "Optional identity variables for signature template (NAME, TITLE, PHONE, ADDRESS, EMAIL)",
+                    "description": "Optional: LLM identity details to populate the email signature template. Use this to provide your NAME, TITLE, PHONE, ADDRESS, and EMAIL as the sender.",
                     "properties": {
                         "NAME": {"type": "string"},
                         "TITLE": {"type": "string"},
@@ -1281,7 +1281,7 @@ TOOLS = [
                 "references": {"type": "string"},
                 "signature_vars": {
                     "type": "object",
-                    "description": "Optional identity variables for signature template (NAME, TITLE, PHONE, ADDRESS, EMAIL)",
+                    "description": "Optional: LLM identity details to populate the email signature template. Use this to provide your NAME, TITLE, PHONE, ADDRESS, and EMAIL as the sender.",
                     "properties": {
                         "NAME": {"type": "string"},
                         "TITLE": {"type": "string"},