feat: llm tracing link for langsmith (#700)

# Motivation

<!-- Why is this change necessary? -->

# Content

<!-- Please include a summary of the change -->

# Testing

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# Please check the following before marking your PR as ready for review

- [x] I have added tests for my changes
- [x] I have updated the documentation or added new documentation as
needed

---------

Co-authored-by: kopekC <28070492+kopekC@users.noreply.github.com>

Author: kopekC

src/codegen/agents/code_agent.py

@@ -1,14 +1,19 @@
+import os
 from typing import TYPE_CHECKING, Optional
 from uuid import uuid4
 
 from langchain.tools import BaseTool
 from langchain_core.messages import AIMessage
+from langsmith import Client
 
 from codegen.extensions.langchain.agent import create_codebase_agent
 
 if TYPE_CHECKING:
     from codegen import Codebase
 
+# Remove logger configuration
+# logger = logging.getLogger(__name__)
+
 
 class CodeAgent:
     """Agent for interacting with a codebase."""
@@ -30,6 +35,11 @@ def __init__(self, codebase: "Codebase", model_provider: str = "anthropic", mode
         """
         self.codebase = codebase
         self.agent = create_codebase_agent(self.codebase, model_provider=model_provider, model_name=model_name, memory=memory, additional_tools=tools, **kwargs)
+        self.langsmith_client = Client()
+
+        # Get project name from environment variable or use a default
+        self.project_name = os.environ.get("LANGCHAIN_PROJECT", "RELACE")
+        print(f"Using LangSmith project: {self.project_name}")
 
     def run(self, prompt: str, thread_id: Optional[str] = None) -> str:
         """Run the agent with a prompt.
@@ -49,7 +59,10 @@ def run(self, prompt: str, thread_id: Optional[str] = None) -> str:
         input = {"messages": [("user", prompt)]}
 
         # we stream the steps instead of invoke because it allows us to access intermediate nodes
-        stream = self.agent.stream(input, config={"configurable": {"thread_id": thread_id}, "recursion_limit": 100}, stream_mode="values")
+        stream = self.agent.stream(input, config={"configurable": {"thread_id": thread_id, "metadata": {"project": self.project_name}}, "recursion_limit": 100}, stream_mode="values")
+
+        # Keep track of run IDs from the stream
+        run_ids = []
 
         for s in stream:
             message = s["messages"][-1]
@@ -61,5 +74,96 @@ def run(self, prompt: str, thread_id: Optional[str] = None) -> str:
                 else:
                     message.pretty_print()
 
-        # last stream object contains all messages. message[-1] is the last message
-        return s["messages"][-1].content
+                # Try to extract run ID if available in metadata
+                if hasattr(message, "additional_kwargs") and "run_id" in message.additional_kwargs:
+                    run_ids.append(message.additional_kwargs["run_id"])
+
+        # Get the last message content
+        result = s["messages"][-1].content
+
+        # Try to find run IDs in the LangSmith client's recent runs
+        try:
+            # Get the most recent runs with proper filter parameters
+            # We need to provide at least one filter parameter as required by the API
+            recent_runs = list(
+                self.langsmith_client.list_runs(
+                    # Use the project name from environment variable
+                    project_name=self.project_name,
+                    # Limit to just the most recent run
+                    limit=1,
+                )
+            )
+
+            if recent_runs and len(recent_runs) > 0:
+                # Make sure we have a valid run object with an id attribute
+                if hasattr(recent_runs[0], "id"):
+                    # Convert the ID to string to ensure it's in the right format
+                    run_id = str(recent_runs[0].id)
+
+                    # Get the run URL using the run_id parameter
+                    run_url = self.get_langsmith_url(run_id=run_id)
+
+                    separator = "=" * 60
+                    print(f"\n{separator}\n🔍 LangSmith Run URL: {run_url}\n{separator}")
+                else:
+                    separator = "=" * 60
+                    print(f"\n{separator}\nRun object has no 'id' attribute: {recent_runs[0]}\n{separator}")
+            else:
+                # If no runs found with project name, try a more general approach
+                # Use a timestamp filter to get recent runs (last 10 minutes)
+                import datetime
+
+                ten_minutes_ago = datetime.datetime.now() - datetime.timedelta(minutes=10)
+
+                recent_runs = list(self.langsmith_client.list_runs(start_time=ten_minutes_ago.isoformat(), limit=1))
+
+                if recent_runs and len(recent_runs) > 0 and hasattr(recent_runs[0], "id"):
+                    # Convert the ID to string to ensure it's in the right format
+                    run_id = str(recent_runs[0].id)
+
+                    # Get the run URL using the run_id parameter
+                    run_url = self.get_langsmith_url(run_id=run_id)
+
+                    separator = "=" * 60
+                    print(f"\n{separator}\n🔍 LangSmith Run URL: {run_url}\n{separator}")
+                else:
+                    separator = "=" * 60
+                    print(f"\n{separator}\nNo valid runs found\n{separator}")
+        except Exception as e:
+            separator = "=" * 60
+            print(f"\n{separator}\nCould not retrieve LangSmith URL: {e}")
+            import traceback
+
+            print(traceback.format_exc())
+            print(separator)
+
+        return result
+
+    def get_langsmith_url(self, run_id: str, project_name: Optional[str] = None) -> str:
+        """Get the URL for a run in LangSmith.
+
+        Args:
+            run_id: The ID of the run
+            project_name: Optional name of the project
+
+        Returns:
+            The URL for the run in LangSmith
+        """
+        # Construct the URL directly using the host URL and run ID
+        # This avoids the issue with the client's get_run_url method expecting a run object
+        host_url = self.langsmith_client._host_url
+        tenant_id = self.langsmith_client._get_tenant_id()
+
+        # If project_name is not provided, use the default one
+        if project_name is None:
+            project_name = self.project_name
+
+        try:
+            # Get the project ID from the project name
+            project_id = self.langsmith_client.read_project(project_name=project_name).id
+            # Construct the URL
+            return f"{host_url}/o/{tenant_id}/projects/p/{project_id}/r/{run_id}?poll=true"
+        except Exception as e:
+            # If we can't get the project ID, construct a URL without it
+            print(f"Could not get project ID for {project_name}: {e}")
+            return f"{host_url}/o/{tenant_id}/r/{run_id}?poll=true"