Readonly[A unique symbol to identify ADK base planner class.
Builds the system instruction to be appended to the LLM request for planning.
The planning system instruction, or undefined if no instruction is needed.
Processes the LLM response for planning.
The LLM response parts. Readonly.
The processed response parts, or undefined if no processing is needed.
Plan-Re-Act planner that constrains the LLM response to generate a plan before any action/observation.
Note: this planner does not require the model to support built-in thinking features or setting the thinking config.