EPISODE · May 25, 2026 · 16 MIN
Build a Regression Gate: Test Sets and Pass-Fail Thresholds for LLM Changes
from Headcount Zero · host Jordan
When a two-word prompt change can approve fourteen spam submissions in one weekend, you need more than eyeballing outputs. This episode builds a regression gate—a frozen test set, three types of automated checkers, and a pass-fail threshold that blocks deploys when something breaks. The whole system runs inside Promptfoo, triggered from Make or n8n, and takes about forty-five minutes to set up from scratch. You'll get the exact CLI commands, environment variables, and exit code logic to catch prompt regressions before your clients do.
What this episode covers
When a two-word prompt change can approve fourteen spam submissions in one weekend, you need more than eyeballing outputs. This episode builds a regression gate—a frozen test set, three types of automated checkers, and a pass-fail threshold that blocks deploys when something breaks. The whole system runs inside Promptfoo, triggered from Make or n8n, and takes about forty-five minutes to set up from scratch. You'll get the exact CLI commands, environment variables, and exit code logic to catch prompt regressions before your clients do.
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Build a Regression Gate: Test Sets and Pass-Fail Thresholds for LLM Changes
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