Time-Based Cache Invalidation Policy

Data artifactTools & IntegrationOrchestration & Toolsarc:TimeBasedCacheInvalidationPolicy

A cache invalidation policy that expires cached tool results after a fixed time-to-live or periodic refresh interval matched to the source's update cadence.

Responsibility. Expires cached results after a configured TTL.

Also known as: TTL invalidation

Variant of Cache Invalidation Policy abstract

When to choose. Choose when the source updates on a known schedule and no change notifications are available.

Direct neighbourhood (hover for relationship types)

Relationships

configures structural

Tool Result Cache Ch8.1

alternative to variability

Event-Based Cache Invalidation Policy Ch7.3

Design guidance

SHOULD set the TTL to the source update cadence (e.g., 24h for a daily-updated paper index, 1h for weather forecasts).

Quantitative guidance

As stated by the sources; verify before use.

ArXiv cache refreshed every 24 hours; weather forecasts cached with 1-hour TTL (Ch7.3).
5-minute entry validity for cached inventory results (Ch8.1).

Classification

Patterns: Time-to-live expiry
Quality attributes: Maintainability (ISO/IEC 25010)Functional suitability: correctness and validity (ISO/IEC 25010 | NIST AI RMF: valid)
Risks mitigated: Unbounded staleness of cached results

Sources

Ch7.3: T. Nguyen, "NeMo Agent Toolkit Profiling," in Mastering Agentic AI Systems: Guide for the NVIDIA NCP-AAI Exam, 1st ed. 2026, ch. 7.3. ISBN: 9798244538229.
Ch8.1: T. Nguyen, "Latency Metrics," in Mastering Agentic AI Systems: Guide for the NVIDIA NCP-AAI Exam, 1st ed. 2026, ch. 8.1. ISBN: 9798244538229.