Parallel Agent Worktree Review: test results

Verdicts

Date

2026-10-19

Strong · claude-sonnet-5-5 (Claude Code alias "sonnet")

Right on all 3 cases, read by hand. On the script with a forced add it named the second worktree as the branch problem and the missing removal at the end, and left out the read-only fixtures folder and the separate branch cut from the same commit. On the three-bugfix plan it gave exactly the shared port and the shared database file and left out the copied env file and the proper cleanup. On the tidy plan it answered exactly No findings.

Weak · claude-haiku-5-5 (Claude Code alias "haiku")

Right on all 3 cases, read by hand. It gave the same two lines as the strong model on each planted plan, with sound fixes, and answered exactly No findings on the tidy plan. It spent far more output tokens than needed on the clean plan, but the final answer was one sentence.

Note

Light test: three cases (two planted, one clean), one run per model; no comparison without the skill. The three inputs were written by us; each planted one carries a safe look-alike and neither planted case has a comment pointing at the defect. Facts come from public documentation, read on 19 October 2026; there are no owner-measured facts.

What was not measured

• Models other than the two named above were not run.
• Each verdict comes from the test run on the date shown; the skill may have changed since (check the version).
• Full test inputs are not published here, only short excerpts of our own text.
• Results on your own texts, languages and domains can differ.