Practical Guides
Choose AI Tools with a Task Checklist
A useful tool shortlist starts with a job, not a popularity chart. This guide is a selection method, not a product ranking or a claim that every listed tool has been tested.
2026/08/25
What Are Agent Skills? How They Differ from Prompts
Understand when a reusable Agent Skill is worth building, what belongs in SKILL.md, and when a normal prompt is enough.
An ordinary prompt tells a model what to do in the current conversation. An Agent Skill packages a repeatable way of working so an Agent can recognize the task, load the right guidance, use the right tools, and verify the result.
The practical difference
A prompt is usually enough when the task is one-off, the context is already in the conversation, and failure is cheap. A Skill becomes useful when the same job returns, quality depends on a specific sequence, or supporting scripts and references should be loaded only when needed.
What a reliable Skill contains
- A narrow job and clear non-goals.
- Trigger conditions that avoid accidental activation.
- Required inputs and an explicit output contract.
- A short workflow with decision points.
- Safety boundaries and failure behavior.
- Tests or examples that distinguish good results from plausible-looking ones.
What should stay outside SKILL.md
Large examples, reference tables, templates, and scripts should live in supporting files. This keeps the default context small and lets the Agent load detail only when the task requires it.
When not to build a Skill
Do not create a Skill for a personal wording preference, an untested workflow, or a task that changes every time. Validate the process manually first.
A useful decision rule
Start with a prompt. When you can name the trigger, repeat the workflow, and test the output, promote it to a Skill.
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Field notes
Get new Agent Skills, prompt patterns, and honest implementation notes. No fabricated metrics, no daily noise.