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News
Diff the Behavior, Not the Code: A Differential Gate for Agent Patches
44+ min ago (807+ words) A test suite that passes after an agent patch proves one thing: the patch satisfies the tests you wrote. It says nothing about the behavior users already depend on. The cheapest reliable oracle is differential — run the old code and…...
CI/CD: From Green Checks to Real Confidence
2+ hour, 14+ min ago (376+ words) Your CI/CD pipeline is green. That doesn't guarantee any reliability. Most engineers write their first pipeline to make a status check pass, — not to buy confidence. It works, right up until you actually depend on it. Then the gaps…...
Part 3: Automated Testing Setup
2+ hour, 24+ min ago (464+ words) Now I am building the CRUD API endpoints for the system, there is no WebSockets and no event-driven architecture and there is not any advanced concepts. I wanted to start setting up the testing environment and workflow from the beginning....
Why "the API returned 200" isn't proof your post is live
6+ hour, 18+ min ago (309+ words) I build LazyRelay, a social scheduling tool. Something that became obvious once we started looking closely: a successful API response from a social platform does not mean your content is actually visible to anyone. Every platform's "create post" endpoint can…...
Your agent's logs are testimony, not evidence
6+ hour, 2+ min ago (694+ words) On August 26, METR and Redwood Research published their independent investigation into the OpenAI / Hugging Face incident. Most coverage led with the spectacle: roughly 1,200 agents in separate sandboxes found a shared message board, exchanged over 70,000 messages and files, and about 700 of…...
Have you ever experienced an API integration where the production environment is different from the test environment?
6+ hour, 37+ min ago (238+ words) As a Software Engineer, i have integrated a lot of third party APIs. Some were great some are okay and some were frustrating We were tasked to integrate a large, well established company API and the documentation is fine, we…...
An Agent Patch Is a Hypothesis. Test It Like One.
6+ hour, 48+ min ago (755+ words) An agent patch is a hypothesis about your codebase. It makes three claims: the invariants still hold, the output changes are intended, and the new failures are not flukes. CI should test all three claims before a human opens the…...
CLI Snapshot Testing: Stop Your Internal Tools From Breaking Everyone Else's Pipeline
6+ hour, 54+ min ago (100+ words) The idea behind cliguard is the same one behind Jest's snapshot tests, applied to a CLI's public surface instead of a rendered component: Install it as a dev dependency: Capture the baseline and commit it: Wire the check into CI: Now,…...
How I Mapped an Undocumented Vendor API in 2 Days With Claude Code
6+ hour, 57+ min ago (1024+ words) A vendor handed us a sandbox key, a 6-page PDF, and no OpenAPI spec. I used Claude Code to turn ~40 exploratory requests into an inferred schema, a typed client, and a contract test suite in two days. The trick was…...
Feature Flag Patterns
7+ hour, 30+ min ago (1568+ words) A practical taxonomy of feature flag patterns for safer releases, experiments, resilience, access, migration, and runtime control. Feature flags are widely used in modern software delivery to control how and when functionality is exposed to users. They allow teams to…...