A useful skill is more than a long prompt. It should define the task, expected inputs, allowed tools, output shape, quality checks, and what the agent should do when information is missing.
Last reviewed: 2026-09-18
Use these as a shortlist, then verify current limits, permissions, and pricing on the provider site.
Package the repeatable parts of a task so the agent does not need to rediscover your preferred process every time.
A small reliable skill such as 'review a pull request for migration risk' is easier to test than a broad 'be my senior engineer' prompt. Compose several narrow skills into a larger workflow after each one is dependable.
Store the instructions, examples, and acceptance criteria in version control or another reviewable system. When an output regresses, you need to know what changed.
A prompt can be part of a skill, but a reusable skill usually also defines inputs, tools, ordered steps, output format, validation, and fallback behavior.
Small enough to test with repeatable examples. Narrow skills are easier to debug, review, reuse, and combine into larger workflows.
Run it against representative tasks, define acceptance checks, review failures, and version changes so regressions are visible.
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