Pitstop

Instructions

Implementation Reference

• tools/session/track_evolution.py:29-119 (handler)

  Main handler function that loads F1 session data using FastF1, filters valid laps, finds the fastest lap time for each lap number across drivers, computes improvement from the first lap's best time, and structures the output using defined Pydantic models.

  def get_track_evolution(
      year: int,
      gp: Union[str, int],
      session: str,
      max_laps: Optional[int] = None
  ) -> TrackEvolutionResponse:
      """
      Track how lap times improved during session as track evolution occurred.
  
      Shows fastest lap per lap number to see track rubbering in and improvement.
  
      Args:
          year: Season year (2018+)
          gp: Grand Prix name or round
          session: 'FP1', 'FP2', 'FP3', 'Q', 'S', 'R'
          max_laps: Optional limit to first N laps
  
      Returns:
          TrackEvolutionResponse with lap-by-lap improvement data
  
      Example:
          get_track_evolution(2024, "Monaco", "FP1") → Practice track evolution
          get_track_evolution(2024, "Monaco", "Q", 20) → First 20 laps of qualifying
      """
      session_obj = fastf1_client.get_session(year, gp, session)
      session_obj.load(laps=True, telemetry=False, weather=False, messages=False)
  
      event = session_obj.event
      laps = session_obj.laps
  
      # Filter for valid laps only (not deleted, not pit laps)
      valid_laps = laps[
          (laps['IsAccurate'] == True) &
          (laps['Deleted'] == False) &
          (pd.notna(laps['LapTime']))
      ].copy()
  
      if len(valid_laps) == 0:
          return TrackEvolutionResponse(
              session_name=session_obj.name,
              event_name=event['EventName'],
              evolution=[],
              total_laps=0,
              total_improvement=None
          )
  
      # Convert LapTime to seconds for comparison
      valid_laps['LapTimeSeconds'] = valid_laps['LapTime'].dt.total_seconds()
  
      # Group by lap number and find fastest for each lap
      evolution_data = []
      lap_numbers = sorted(valid_laps['LapNumber'].unique())
  
      if max_laps:
          lap_numbers = [ln for ln in lap_numbers if ln <= max_laps]
  
      first_lap_best = None
  
      for lap_num in lap_numbers:
          lap_data = valid_laps[valid_laps['LapNumber'] == lap_num]
          fastest_idx = lap_data['LapTimeSeconds'].idxmin()
          fastest_lap = lap_data.loc[fastest_idx]
  
          if first_lap_best is None:
              first_lap_best = fastest_lap['LapTimeSeconds']
              improvement = None
          else:
              improvement = first_lap_best - fastest_lap['LapTimeSeconds']
  
          evolution_data.append(
              LapEvolution(
                  lap_number=int(lap_num),
                  best_time=str(fastest_lap['LapTime']),
                  driver=str(fastest_lap['Driver']),
                  driver_number=str(fastest_lap['DriverNumber']),
                  improvement_from_lap_1=improvement
              )
          )
  
      # Calculate total improvement
      total_improvement = None
      if len(evolution_data) >= 2 and evolution_data[-1].improvement_from_lap_1 is not None:
          total_improvement = evolution_data[-1].improvement_from_lap_1
  
      return TrackEvolutionResponse(
          session_name=session_obj.name,
          event_name=event['EventName'],
          evolution=evolution_data,
          total_laps=len(evolution_data),
          total_improvement=total_improvement
      )

• tools/session/track_evolution.py:11-27 (schema)

  Pydantic models defining the structure of lap evolution data points and the overall response for the tool.

  class LapEvolution(BaseModel):
      """Lap time evolution data point."""
      lap_number: int = Field(..., description="Lap number")
      best_time: str = Field(..., description="Best lap time for this lap number across all drivers")
      driver: str = Field(..., description="Driver who set this time")
      driver_number: str = Field(..., description="Driver number")
      improvement_from_lap_1: Optional[float] = Field(None, description="Seconds faster than lap 1 best")
  
  
  class TrackEvolutionResponse(BaseModel):
      """Response for track evolution data."""
      session_name: str = Field(..., description="Session name")
      event_name: str = Field(..., description="Event name")
      evolution: list[LapEvolution] = Field(..., description="Lap time evolution throughout session")
      total_laps: int = Field(..., description="Total number of laps analyzed")
      total_improvement: Optional[float] = Field(None, description="Total improvement in seconds from start to end")

• server.py:155-155 (registration)

  Registers the get_track_evolution function as an MCP tool using the FastMCP tool decorator.

  mcp.tool()(get_track_evolution)