Agent harness — what the agent is told, and how to audit what someone else told theirs

agent-orchestrator wires the loop. agent-evals proves it behaves. agent-interop gets it talking to other processes. This skill is the layer between them and the model: the prompt, the tools, and the shape of the work.

It runs in both directions. Building one and auditing one are the same checklist read forwards and backwards, which is why they live together here.

Rule zero — most agent bugs are prompt bugs wearing a stack trace

The instinct when an agent misbehaves is to change the code. The measured reality, in every source this skill was built from, is that the largest behavioural changes come from the text: "the biggest performance improvements often come from clearly explaining tool usage in the system prompt", and "even small refinements to tool descriptions can yield dramatic improvements."