spyscope

Uses reader tags like #spy/p, #spy/d, #spy/t to instrument code with just six characters, reducing keystrokes and optimizing developer efficiency.

Provides stack traces, timestamps, markers, and configurable filtering (e.g., :nses regex) to give detailed insights into execution, especially useful for complex flows.

Prints on a dedicated tracing thread to prevent interleaved output from multiple threads, making it ideal for debugging multi-threaded applications.

Stores traces in generations with functions like trace-query and trace-next, allowing post-hoc comparison across runs to understand code changes over time.