doc: remove unnecessary string formatting

Signed-off-by: Sienna Chien <siennac@Siennas-MacBook-Air.local>

Author: Sienna Chien

README.md

@@ -1,4 +1,4 @@
 # agent-examples
 
 This repo collects several examples of community agents and MCP tools written in different
-frameworks and exposed with agent-to-agent protocols and tools protocols such as A2A and MCP.  
+frameworks and exposed with agent-to-agent protocols and tools protocols such as A2A and MCP. 

mcp/slack_tool/slack_tool.py

@@ -31,11 +31,11 @@ def slack_client_from_bot_token(bot_token):
 
 def get_slack_client(access_token=None):
     if ADMIN_SLACK_BOT_TOKEN is None:
-        logger.debug(f"No ADMIN_SLACK_BOT_TOKEN configured - automatically configuring based on SLACK_BOT_TOKEN. ")
+        logger.debug("No ADMIN_SLACK_BOT_TOKEN configured - automatically configuring based on SLACK_BOT_TOKEN. ")
         return slack_client_from_bot_token(SLACK_BOT_TOKEN)
     # we do fine-grained authz
     if access_token is None:
-        logger.error(f"ADMIN_SLACK_BOT_TOKEN configured, but no access token passed. ")
+        logger.error("ADMIN_SLACK_BOT_TOKEN configured, but no access token passed. ")
         return None
 
     # Access token is now claims dict from FastMCP AccessToken