How to Stress-Test an AI Coding Agent's Memory With a Simple Migration Scenario
A structured evaluation method for AI coding agent memory involves feeding the agent conflicting project instructions across separate sessions to see how it handles updates. The test uses two fictional projects, Atlas and Beacon, with Atlas receiving a command change from 'npm test' to 'pnpm test' on a specific date, while Beacon's command stays the same. Evaluators then probe the agent across fresh sessions to check whether it returns the current command, recalls historical state, distinguishes between projects, and correctly flags missing information. When an agent fails a question, the recommended approach is to isolate the failure to one of three stages: the write path, the retrieval layer, or the final prompt context sent to the model. The exercise is designed to be storage-agnostic, applicable to memory files, relational tables, vector stores, or knowledge graphs.
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