The original title is: "Before Adopting jcode, Run a 15-Minute Agent-Harness Exit Test"

Short summary

jcode is a new MIT-licensed Rust coding-agent harness. Rather than testing it on your hardest problem, the post proposes a 15-minute exit test: create a tiny repo with one bug, ask the harness to fix it, then verify another developer can clone and validate the result with plain Git and npm. A second test uses a deliberately failing exit code to check whether the harness correctly reports failure instead of claiming success.

• •Create a minimal repo with one bug; task passes only if another dev can verify with plain Git and npm
• •Replace the test command with one that exits 17; harness must preserve patch, report failure, and stop retrying
• •Keep the fixture as a reusable acceptance test for future harnesses

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