How are you regression-testing agent workflows before users find the failures?

Reddit r/AI_Agents News

Summary

The author asks how developers are regression-testing AI agent workflows, noting common failure modes and sharing their work on adding eval support to Runme for recording tasks, scoring trajectories, and comparing against baselines.

Curious how people here are testing AI agent workflows (Claude [Code], Codex, Cursor, etc) once they become more than a prompt. I mean the layer around the model: repo instructions, skills, MCP/tool setup, memory, hooks, guardrails, and the expected sequence of steps the agent should follow. The failure mode I keep seeing: one great transcript makes a workflow look “done,” then a later run fails because the skill didn’t activate, the wrong tool got used, a source got skipped, or the final artifact looked right for the wrong reasons. Are you testing only the final output, or the agent trajectory too? For example: - did the intended skill/rule activate? - did the agent call the right tools? - did it follow the expected workflow? - can you compare against a known-good baseline? Disclosure: I work on Runme (Open Source), and I’ve been thinking about this while building eval support there. The pattern I’m exploring is basically repo-local regression tests for deploying workflows into AI agent harnesses: record the task, run the agent, score artifact + trajectory, compare against baseline. Would love to hear how others are handling this. Heads up, this is not for BYO agents via SDKs or LLM model loops.
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