Data freshness and endpoint liveness verification for AI agents. Probes external APIs and endpoints before agents act on their data, returning deterministic FRESH/STALE/UNKNOWN verdicts with confidence scores. Analyzes HTTP cache headers, measures latency percentiles (P50/P95/P99), fingerprints content for change detection, checks TLS certificate health, and evaluates against configurable freshness policies. Exposes three MCP tools (freshprobe_check, freshprobe_batch, freshprobe_policy) and includes a built-in skill and agent for contextual triggering. NIST AI RMF aligned. Single Go binary, MIT licensed.