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The ADK plugin selects a session backend at initialization time based on whether a database connection is available. Sessions map to the A2A context_id and hold conversation history and agent state between turns.

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In-Memory Backend

  • Default when no database connection is configured.
  • Best for local development and stateless testing.
  • Session data is lost on process restart.

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Database Backend

  • Used when a database connection is available.
  • Best for persistent sessions and multi-instance environments where conversation continuity across restarts is required.
  • Requires POSTGRES_URL to be configured.

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Operational Guidance

  • Use in-memory session storage for local development.
  • Use PostgreSQL-backed session storage for production session continuity.