feat: Add synopisis core loop (#166)

Co-authored-by: Michael Neale <michael.neale@gmail.com>

packages/exchange/src/exchange/content.py

@@ -1,5 +1,6 @@
 from typing import Optional
 
+import json
 from attrs import define, asdict
 
 
@@ -21,6 +22,10 @@ class Content:
 class Text(Content):
     text: str
 
+    @property
+    def summary(self) -> str:
+        return "content:text\n" + self.text
+
 
 @define
 class ToolUse(Content):
@@ -30,9 +35,17 @@ class ToolUse(Content):
     is_error: bool = False
     error_message: Optional[str] = None
 
+    @property
+    def summary(self) -> str:
+        return f"content:tool_use:{self.name}\nparameters:{json.dumps(self.parameters)}"
+
 
 @define
 class ToolResult(Content):
     tool_use_id: str
     output: str
     is_error: bool = False
+
+    @property
+    def summary(self) -> str:
+        return f"content:tool_result:error={self.is_error}\noutput:{self.output}"

packages/exchange/src/exchange/message.py

@@ -119,3 +119,7 @@ class Message:
     @classmethod
     def assistant(cls: type["Message"], text: str) -> "Message":
         return cls(role="assistant", content=[Text(text)])
+
+    @property
+    def summary(self) -> str:
+        return f"message:{self.role}\n" + "\n".join(content.summary for content in self.content)