Building Internal Agent Frameworks: Nine Hard Problems Engineers Are Actually Hitting

Will Larson published a nine-part series on the real engineering challenges of building internal agent frameworks — compaction, workflow orchestration, and more — offering a rare production-level view.

Will Larson (@Lethain) published a series of nine short posts documenting the interesting problems his team encountered while building an internal agent framework. The series drew 43,000 views and stands out for its specificity — this isn't agent hype, it's an engineering lead cataloguing the actual hard problems: context compaction, workflow reliability, tool orchestration, and the myriad failure modes that emerge when agents operate in production environments.

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