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A check that cannot fail has never passed

A check that cannot fail has never passed

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4 min read
Why AWS Built an Emulator to Give Coding Agents a Local Feedback Loop

Why AWS Built an Emulator to Give Coding Agents a Local Feedback Loop

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4 min read
Selecting Tests for Agent Patch Queues: A Precision Budget With a Hard Floor

Selecting Tests for Agent Patch Queues: A Precision Budget With a Hard Floor

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6 min read
Review-Driven Development: a method for the bugs a 95% mutation score can't see

Review-Driven Development: a method for the bugs a 95% mutation score can't see

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13 min read
Synthetic User Journey Monitoring with Playwright to Catch Broken Checkout Flows

Synthetic User Journey Monitoring with Playwright to Catch Broken Checkout Flows

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2 min read
The Patch Edited the Fixture, Not the Code: Catching Fixture Laundering in Agent Patches

The Patch Edited the Fixture, Not the Code: Catching Fixture Laundering in Agent Patches

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7 min read
One Revertible Slice at a Time: A Diff Budget for Messy Repos

One Revertible Slice at a Time: A Diff Budget for Messy Repos

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5 min read
48-Hour Field Notes: My JSON Schema Passed While My Enum Quietly Drifted

48-Hour Field Notes: My JSON Schema Passed While My Enum Quietly Drifted

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6 min read
Every Frozen Test Casts a Shadow: Auditing What Your Patch Gate Stops Seeing

Every Frozen Test Casts a Shadow: Auditing What Your Patch Gate Stops Seeing

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6 min read
What an offline evidence finder guarantees about a quote

What an offline evidence finder guarantees about a quote

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4 min read
your canary tested three fields. the leak was in the fourth.

your canary tested three fields. the leak was in the fourth.

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3 min read
Verify XLSX metadata cleanup with Python

Verify XLSX metadata cleanup with Python

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4 min read
The Patch Window: Let a Model Refactor Only Lines Your Tests Already Cover

The Patch Window: Let a Model Refactor Only Lines Your Tests Already Cover

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5 min read
Reading a test result out of a coding agent's transcript is harder than checking the exit code

Reading a test result out of a coding agent's transcript is harder than checking the exit code

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4 min read
My link checker said six of our citations were dead. All six were my HTTP client.

My link checker said six of our citations were dead. All six were my HTTP client.

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4 min read
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