Summary
MemGuard (Apr 6 2026) found that 33% of stored facts become incorrect within 90 days. Their key technique: source-linked re-fetching — for facts that originated from external sources, periodically re-fetch the source and compare. Catches 80% of staleness without LLM costs.
How this applies to aletheia
Facts with causal provenance edges pointing to external sources (URLs, documents, API responses) can be validated by re-checking the source. This is cheaper than LLM-based re-evaluation and catches a common failure mode.
Proposed approach
- For facts with external source provenance, store the source URI
- During prosoche self-audit, re-fetch a sample of source-linked facts
- Compare current source content against the stored fact
- Flag divergences for review or automatic confidence reduction
Source
MemGuard: "Your AI Agent is Confidently Lying" (earezki.com, Apr 6 2026). 33% staleness within 90 days validates aletheia's temporal decay approach.
Summary
MemGuard (Apr 6 2026) found that 33% of stored facts become incorrect within 90 days. Their key technique: source-linked re-fetching — for facts that originated from external sources, periodically re-fetch the source and compare. Catches 80% of staleness without LLM costs.
How this applies to aletheia
Facts with causal provenance edges pointing to external sources (URLs, documents, API responses) can be validated by re-checking the source. This is cheaper than LLM-based re-evaluation and catches a common failure mode.
Proposed approach
Source
MemGuard: "Your AI Agent is Confidently Lying" (earezki.com, Apr 6 2026). 33% staleness within 90 days validates aletheia's temporal decay approach.