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Error recovery determines whether your Claude Code subagents crash on transient failures or degrade gracefully. Learn retry logic, loop detection, and circuit breakers that prevent runaway costs.

Anthropic's usage field returns structured token counts, but no first-party dashboard aggregates them into actionable cost metrics. Build a TypeScript parser, set per-user caps, and instrument the gaps in the official API.

Five battle-tested patterns for satisfying strictPropertyInitialization without definite assignment assertions that mask bugs. Learn when optional properties, constructor methods, and dependency injection give you type safety that holds at runtime.