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Product2 min read

Six metrics worth tracking on a voice agent, and three that mislead

Containment rate looks like the number that matters. It is the one most likely to make a failing deployment look healthy.

LP

Lucy Product

May 28, 2026

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A dashboard showing voice agent performance metrics

On this page

  • The six to track
  • The three that mislead
  • Containment rate
  • Average handle time
  • Raw transcription accuracy

Key takeaways

  • Track resolution, not containment. A contained call that solves nothing is a failure.
  • Repeat-call rate within 48 hours is the single best quality signal.
  • Average handle time on an agent is close to meaningless on its own.

Once an agent is live, the reporting question arrives quickly, usually from someone who has to justify the deployment. The metrics that are easiest to produce are not the ones that tell you whether it is working.

The six to track

  1. Resolution rate. Share of calls where the caller's request was completed, verified against the transcript, not inferred from the call ending.
  2. Repeat-call rate within 48 hours. The clearest signal of a bad answer. A caller who calls back did not get what they needed.
  3. Escalation rate with reason. Escalation is fine. Escalation you cannot categorise is not.
  4. Unmatched intent rate. How often callers ask for something the knowledge base has nothing on. This is your content backlog.
  5. Time to first useful moment. Not time to answer, which is always instant. Time until the caller has said what they need and been understood.
  6. Abandonment against calls offered. The denominator matters more than the metric.

The one to watch weekly

Unmatched intent rate. It is the only metric here that tells you what to do next rather than how you did.

The three that mislead

Containment rate

Containment counts calls that did not reach a human. A caller who hung up in frustration is contained. A caller who got a confidently wrong answer is contained. Optimising for it directly pushes an agent toward refusing to escalate, which is the opposite of what you want.

Average handle time

On a human queue, handle time is a proxy for efficiency. On an agent it is a proxy for almost nothing. Short calls can mean crisp resolution or premature endings. Long ones can mean thorough handling or a loop. Read it split by outcome or do not read it.

Raw transcription accuracy

Word error rate is useful to engineers and misleading to everyone else. An agent can misrecognise several unimportant words and still act correctly, or get one account number wrong in an otherwise perfect transcript and fail the call. Judge on outcomes.

MetricWhat it actually measuresRead weekly?
Resolution rateWhether the agent worksYes
Repeat calls, 48hWhether the answers were rightYes
Unmatched intentsWhat to build nextYes
ContainmentWhether calls avoided humansNo
Average handle timeVery little on its ownNo

If you track one thing, track repeat calls. It is hard to game, easy to compute, and it moves when quality moves.

See the reporting

We will walk you through what the dashboard shows on a live deployment.

Book a demo
TagsMetricsOperationsQuality
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LP

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Lucy Product

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