case studies
How a Bug Report Can Arrive as a Runnable CodeInstances File
You maintain a command-line tool that talks to an online service. An issue comes in: “sync breaks against our account”. You don’t have their account. …
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Case Studies
case studies
How CodeInstances Keeps the Failing Run of a Flaky CI Test
Here’s a situation most teams know. An integration test fails about one run in twenty. It calls an API that usually answers one way and occasionally answers another …
case studies
How to Develop Against a Metered or Rate Limited API With CodeInstances
Some APIs you can’t call as often as you’d like. A payments sandbox that throttles you after a burst. A maps or weather API billed per request. A …
case studies
How to Replay the AI Agent Run That Did Something Odd Last Night
An agent ran overnight on a batch of tasks. In the morning one result is wrong. It filed a ticket under the wrong customer, or summarised a document it never fetched, or …
case studies
How to Upgrade a Dependency With CodeInstances Replaying Real Runs
You need to bump something underneath your program. A new major version of the HTTP client library, a vendor’s SDK, or the Go toolchain itself. The changelog is …