Türker Yıldırım

Uncategorized

  • Reusable skills and agent definitions, and what they are actually for

    Deep dive18 min read

    turkerdev/ai-skills and turkerdev/ai-agents, and eighteen months of retyping the same instructions. Context is per-session and knowledge is not.

  • Two years in, and the measurement problem is unchanged

    Note2 min read

    Eighteen months of trying to say something specific about assisted coding, and the same conclusion as the first attempt. Two years and the honest position is that the…

  • Node 24, and a permission model I still did not enable

    Note1 min read

    A runtime permission model re-evaluated a year after the first look, with the same conclusion for the same reason. Re-running an evaluation and reaching the same conclusion is…

  • Equality on a type where identity was ambiguous

    Note2 min read

    A value object where two instances with the same fields might or might not be the same thing, and five years of nobody deciding. The ambiguity is in…

  • Eleven indexes that existed only for reporting

    Note1 min read

    Indexes on production tables serving queries that no user request ever makes. An index that serves only reporting is paying a write cost on every insert to make…

  • Write latency after dropping an index

    Note2 min read

    Eleven indexes removed from production tables, and the write path measured before and after. The median saving is trivial and the tail is not, which is the usual…

  • Deleting a module

    Deep dive10 min read

    A module built in 2022 for a product line discontinued in 2024. Eight thousand lines, a database schema and two scheduled jobs, all still running.

  • The exception I stopped catching

    Note1 min read

    A catch block added in 2021 for an error that has not occurred since, swallowing a different one. A catch of Throwable is a decision that every possible…

  • Three conventions a linter could not express

    Note2 min read

    Stylelint enforcing what it can, and three rules that stayed as prose. The first one is the interesting failure: a rule exists, it works, and its false positive…

  • A pipeline described in one file, after four years of five

    Deep dive10 min read

    Five workflow files, two composite actions, and nobody able to say what runs when. A change that needed editing three files, one of them wrong.