Debug from a stack trace without guessing
Forces the model to separate what the trace proves from what it's inferring, rank hypotheses by testability, and give you the cheapest experiment that discriminates between them.
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Forces the model to separate what the trace proves from what it's inferring, rank hypotheses by testability, and give you the cheapest experiment that discriminates between them.
Reads a function and enumerates the boundaries, empty states, and concurrency cases you didn't think of — then writes only the tests that could actually fail.
Reviews a diff at three altitudes — design, correctness, style — and explains the reasoning behind each note so the author learns something instead of just applying a patch.
Produces the orientation doc a new engineer actually needs: the three things that will confuse them, the load-bearing files, and the conventions nobody wrote down.

Most agent failures aren't model failures — they're context failures. A coding agent spends a weekend modernizing dead code, and we unpack the skill that decides whether an agent ships: context engineering.