Add bluesky_reply tool for Letta agent responses

- Created new reply.py tool module with bluesky_reply function
- Added 300 character validation to match Bluesky's limit
- Registered the tool in register_tools.py
- This simple tool allows the Letta agent to indicate when it wants to send a reply

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[e-mail]>

register_tools.py

···
 from tools.post import create_new_bluesky_post, PostArgs
 from tools.feed import get_bluesky_feed, FeedArgs
 from tools.blocks import attach_user_blocks, detach_user_blocks, AttachUserBlocksArgs, DetachUserBlocksArgs
+from tools.reply import bluesky_reply, ReplyArgs
 
 load_dotenv()
 logging.basicConfig(level=logging.INFO)
···
         "args_schema": DetachUserBlocksArgs,
         "description": "Detach user-specific memory blocks from the agent. Blocks are preserved for later use.",
         "tags": ["memory", "blocks", "user"]
+    },
+    {
+        "func": bluesky_reply,
+        "args_schema": ReplyArgs,
+        "description": "Simple reply indicator for the Letta agent (max 300 chars)",
+        "tags": ["bluesky", "reply", "response"]
     },
 ]
 

tools/reply.py

···
+"""Reply tool for Bluesky - a simple tool for the Letta agent to indicate a reply."""
+from pydantic import BaseModel, Field, validator
+
+
+class ReplyArgs(BaseModel):
+    message: str = Field(
+        ..., 
+        description="The reply message text (max 300 characters)"
+    )
+    
+    @validator('message')
+    def validate_message_length(cls, v):
+        if len(v) > 300:
+            raise ValueError(f"Message cannot be longer than 300 characters (current: {len(v)} characters)")
+        return v
+
+
+def bluesky_reply(message: str) -> str:
+    """
+    This is a simple function that returns a string. MUST be less than 300 characters.
+    
+    Args:
+        message: The reply text (max 300 characters)
+        
+    Returns:
+        Confirmation message
+        
+    Raises:
+        Exception: If message exceeds 300 characters
+    """
+    if len(message) > 300:
+        raise Exception(f"Message cannot be longer than 300 characters (current: {len(message)} characters)")
+    
+    return 'Reply sent'