anthony taguest·sydney --:--
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Short notes I keep coming back to — mostly what I've learned building.
the counter that never countsSynced passkeys report signature counter 0 forever — design for the credential that lies.e2eeJul 14, 2026absent and error are different nothingsWhen absence triggers setup, a flaky read must never look like an empty store.engineeringJul 12, 2026safe by construction, not by runbookRules that live in an operator’s discipline get skipped; encode them in structure.e2eeJul 12, 2026a cron that writes secrets it can’t readA keyless server can append to a diary it can never open.e2eeJul 12, 2026one store, every doorA bulk write to one feature suspended the store holding every private surface — including the record that signs me in.e2eeJul 12, 2026prove the new door before closing the oldMigrations are two acts, not one: add and prove in parallel, then remove in a step small enough to skip.e2eeJul 12, 2026graceful degradation is an invariant, not a vibeA fallback only counts if the try starts at the first fallible line.engineeringJul 4, 2026the happy path hides the hardest inputA Japanese-input app shipped an Enter-to-send that broke for anyone typing Japanese.engineeringJul 4, 2026save the work, then mark it doneA blip on a cosmetic stats call threw away 38 paid AI judgments — a side-effect ordering bug.engineeringJun 25, 2026keep the model in its laneLet the model do the fuzzy part; compute everything that can be computed.agentsJun 21, 2026
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