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Mastra·Feb 9, 2026·v1.1.0·open source

Observational Memory

Observational Memory is Mastra's innovative memory system designed for long-context agentic memory. It utilizes two background agents—an Observer and a Reflector—to monitor agent conversations and maintain a dense observation log, effectively replacing raw message history as it grows. This approach enhances performance by compressing context and ensuring a stable context window.

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overview

Observational Memory is Mastra's innovative memory system designed for long-context agentic memory. It utilizes two background agents—an Observer and a Reflector—to monitor agent conversations and maintain a dense observation log, effectively replacing raw message history as it grows. This approach enhances performance by compressing context and ensuring a stable context window.

key features
  • 01Log-based message format for observations
  • 02Three-date model for temporal reasoning
  • 03Emoji-based prioritization for event importance
  • 04Stable context window for prompt caching
  • 05Compression of raw message history into dense observations
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