Synth builds, runs and grades AI agents across chat, voice and email, with every decision traced and every answer yours to change.https://synth.xocoweb.workers.dev/enhttps://synth.xocoweb.workers.dev/blog/refunds-never-ask-the-model/https://synth.xocoweb.workers.dev/blog/refunds-never-ask-the-model/Language models are good at conversation and bad at policy. Here is how we split the two, and what it did to our error rate.Wed, 16 Sep 2026 00:00:00 GMTEngineeringflowsreliabilityrefundshello@example.com (Tomasz Wrona)https://synth.xocoweb.workers.dev/blog/grading-every-conversation/https://synth.xocoweb.workers.dev/blog/grading-every-conversation/Reviewing fifty tickets a week felt rigorous. Scoring all of them showed us how much the sample was hiding.Wed, 09 Sep 2026 00:00:00 GMTResearchevaluationqualityhello@example.com (Ines Moreau & Tomasz Wrona)https://synth.xocoweb.workers.dev/blog/where-800-milliseconds-go/https://synth.xocoweb.workers.dev/blog/where-800-milliseconds-go/People notice a pause on the phone at around a second. This is the latency budget we work to, stage by stage.Fri, 28 Aug 2026 00:00:00 GMTEngineeringvoicelatencyperformancehello@example.com (Tomasz Wrona)https://synth.xocoweb.workers.dev/blog/five-week-launch-plan/https://synth.xocoweb.workers.dev/blog/five-week-launch-plan/The plan we run with every new customer, week by week, including what we check before real traffic arrives.Wed, 19 Aug 2026 00:00:00 GMTGuideslaunchplaybookhello@example.com (Daniel Reyes & Amara Okafor)https://synth.xocoweb.workers.dev/blog/rubrics-a-reviewer-can-apply/https://synth.xocoweb.workers.dev/blog/rubrics-a-reviewer-can-apply/Most quality rubrics are written for people who already know what good looks like. Here is how to write one for a model.Fri, 07 Aug 2026 00:00:00 GMTResearchevaluationrubricshello@example.com (Ines Moreau)https://synth.xocoweb.workers.dev/blog/routing-each-step-to-a-model/https://synth.xocoweb.workers.dev/blog/routing-each-step-to-a-model/One model per agent is simple and expensive. One model per step is cheaper, faster and easier to change. Here is how routing works.Wed, 29 Jul 2026 00:00:00 GMTProductmodelsroutingcosthello@example.com (Amara Okafor)https://synth.xocoweb.workers.dev/blog/hand-offs-are-a-feature/https://synth.xocoweb.workers.dev/blog/hand-offs-are-a-feature/An agent that never hands over is either doing very easy work or doing hard work badly. How we design the moment it passes to a person.Wed, 15 Jul 2026 00:00:00 GMTProducthand-offhelpdeskdesignhello@example.com (Amara Okafor)https://synth.xocoweb.workers.dev/blog/regression-suite-from-transcripts/https://synth.xocoweb.workers.dev/blog/regression-suite-from-transcripts/Synthetic test cases miss the strange things customers actually say. A step-by-step guide to turning your history into tests.Thu, 02 Jul 2026 00:00:00 GMTGuidestestingevaluationplaybookhello@example.com (Daniel Reyes)https://synth.xocoweb.workers.dev/blog/nine-thousand-rebookings/https://synth.xocoweb.workers.dev/blog/nine-thousand-rebookings/When a winter storm grounded two hundred flights, an airline's agent handled the morning. What we saw from the inside.Thu, 18 Jun 2026 00:00:00 GMTCompanytravelscalecustomershello@example.com (Daniel Reyes)https://synth.xocoweb.workers.dev/blog/redact-before-the-prompt/https://synth.xocoweb.workers.dev/blog/redact-before-the-prompt/If personal data reaches a model, no amount of filtering afterwards takes it back. Where we redact, and why it has to be first.Thu, 04 Jun 2026 00:00:00 GMTEngineeringprivacysecuritycompliancehello@example.com (Tomasz Wrona)