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Latest in Testing & Quality
I asked 63 models the same 76 questions, with and without web search
3+ min ago (869+ words) The 2026 standard deduction for a single filer is $16,100. I asked 63 models what it was. Asked from memory, 8 of 61 got it right. 24 invented a number, three of them landing on $8,300. 19 gave a figure from an earlier year. 9 refused to answer. Of…...
Catch skill regressions before they ship in 2026
8+ min ago (642+ words) Three weeks ago, on a Tuesday afternoon, I edited a single sentence in a skill that classifies incoming support tickets. The change looked harmless. I added "prioritize billing issues" to the instructions because a stakeholder asked. I ran the skill…...
Debugging a 41-second regex hang with a regex tester in 2026
8+ min ago (775+ words) Use a regex tester that shows capture groups live and warns about catastrophic backtracking, because the pattern that takes production down is rarely a wrong match. It's usually a pattern that works fine on 20 characters and hangs forever on 40. Paste…...
Zod vs Pydantic vs Ajv: I ran one broken schema in all 3
8+ min ago (687+ words) Ajv. It was the only one of the three that rejected my malformed tool schema, because it validates the schema document itself rather than validating data against it. Zod prevents the bug by construction if you author in TypeScript, and…...
3 LLM diff tools, 1 task: which one I actually use in 2026
8+ min ago (594+ words) I use the diff-based comparator for daily prompt work, and promptfoo when I need a repeatable eval in CI. Vercel's Playground is the quickest way to eyeball two models, but it stops there. If all you want is to see what…...
Exposing live SDK state without handing callers a mutable object
15+ min ago (525+ words) An SDK can own a mutable state object and still need to expose it to consumers. The difficult part is deciding what a consumer actually receives. A copy can become stale. Freezing the SDK's original state prevents the owner from…...
Finding Dead Code Across Multi-File Codebases with AST Call-Graph Reachability
23+ min ago (341+ words) Traditional linters like ESLint do a great job finding unused variables within a single file. But when a function is exported, file-scoped linters give up, assuming some other module might import it. To detect truly dead functions across an entire…...
An SBOM is a tool output, not a fact about your software
18+ min ago (609+ words) My position: an SBOM generated in CI is evidence about the tool you ran, at the version you ran it, under the flags you set. It is weak evidence about the software. That still leaves it useful, but the thing…...
A denylist let 46 of 75 prompt injections through. Capabilities let 3.
18+ min ago (864+ words) Most of GTIG's "From Prompting to Autonomy" is about attackers using agents. The part that belongs on an operations desk is the section on UNC6780, which has been compromising PyPI, npm and Docker Hub packages since March 2026, and its credential stealer…...
PowerShell Join-Path: Build File Paths Without Slash Bugs
30+ min ago (701+ words) Most broken PowerShell scripts I've debugged didn't fail on some clever logic. They failed on a path glued together with a string: "$dir\$file". One trailing backslash, one empty variable, or one run on Linux, and the script writes to…...