Tool *_metrics returns per-tool snapshot:
| Field | Meaning |
|---|---|
calls |
Total invocations |
errors |
Total error outcomes |
windowCount |
Count in current 60s window |
avgLatencyMs |
Mean latency (rolling) |
p95LatencyMs |
95th percentile latency |
p99LatencyMs |
99th percentile latency |
errorRatePct |
Window error percentage |
currentSuccessStreak |
Consecutive successes |
currentFailureStreak |
Consecutive failures |
Rolling latencies capped (200 samples) for percentile efficiency.
Use metrics to tune retry, rate limit, streaming thresholds.
Next: Security.