fix: clear agent executor messages between tasks to prevent memory leak

[harihran-del]

Description: Currently, when an Agent is reused for multiple tasks within a Crew, the agent_executor.messages history is not cleared. This causes context leakage where instructions or data from Task 1 persist into Task 2, leading to potential hallucinations and unnecessary token usage.

Changes:

Modified src/crewai/agent/core.py in _update_executor_parameters to clear the agent_executor.messages list before a new task begins.

Testing:

Verified with a reproduction script that checks the length of agent_executor.messages after consecutive tasks.

Confirmed memory resets to 0 (or baseline) instead of accumulating.

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Note

Low Risk
Low risk because it is a small, localized change that only clears per-executor message state between task runs; the main risk is unintentionally removing any desired cross-task conversational continuity.

Overview
Prevents cross-task context leakage when reusing an Agent by clearing agent_executor.messages at the start of _update_executor_parameters before updating task/tool/prompt settings.

This keeps executor message history from accumulating across tasks, reducing unintended prompt carryover and excess token usage.

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