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The Agent Converted the If/Else Chain to a Lookup Map and Dropped the Side Effect

The Agent Converted the If/Else Chain to a Lookup Map and Dropped the Side Effect

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3 min read
The Agent Added an Await to a Synchronous Function. The Caller Didn't Notice.

The Agent Added an Await to a Synchronous Function. The Caller Didn't Notice.

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3 min read
The Agent Deleted the Comment That Explained Why the Code Looks Weird

The Agent Deleted the Comment That Explained Why the Code Looks Weird

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3 min read
The agent refactored that tiny function for clarity. It doubled the runtime.

The agent refactored that tiny function for clarity. It doubled the runtime.

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2 min read
The Agent Flattened Your Custom Error Type Into a Generic Error

The Agent Flattened Your Custom Error Type Into a Generic Error

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3 min read
Twenty Identical Runs or No Refactor: A Determinism Gate for Characterization Tests

Twenty Identical Runs or No Refactor: A Determinism Gate for Characterization Tests

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4 min read
The agent created a new file instead of editing the existing one. Now there are two.

The agent created a new file instead of editing the existing one. Now there are two.

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3 min read
Test the Safety Net First: Mutation-Check Characterization Pins Before a Refactor

Test the Safety Net First: Mutation-Check Characterization Pins Before a Refactor

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5 min read
Freeze the Clock First: A Nondeterminism Gate for Messy Refactors

Freeze the Clock First: A Nondeterminism Gate for Messy Refactors

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5 min read
Find the Seam Before You Cut: A Read/Write Census for Messy Modules

Find the Seam Before You Cut: A Read/Write Census for Messy Modules

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7 min read
The Bug Is in the Files: Characterize Filesystem Side Effects Before a Messy Refactor

The Bug Is in the Files: Characterize Filesystem Side Effects Before a Messy Refactor

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5 min read
The Shape Census: Triage a Messy Module Before You Refactor It

The Shape Census: Triage a Messy Module Before You Refactor It

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6 min read
Cap Snapshot Churn: A Failure-First Characterization Harness for Messy Repos

Cap Snapshot Churn: A Failure-First Characterization Harness for Messy Repos

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5 min read
Pin the Call Log, Not the Return Value: Choosing the Smallest Safe Refactor Move

Pin the Call Log, Not the Return Value: Choosing the Smallest Safe Refactor Move

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6 min read
Characterization Tests Are Not Enough: Add a Diff-Budget Guard

Characterization Tests Are Not Enough: Add a Diff-Budget Guard

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6 min read
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