The First Decision: Is the Skill Working as a System?

A Claude Skill is ready for evaluation only when its parts form one coherent path from an intended outcome to a bounded action. The useful judgment here is not whether the package contains good instructions in isolation. It is whether the outcome, activation boundary, execution path, context strategy, and control points agree well enough that a test can tell us something meaningful. This integrated view turns a Skill from a collection of text and resources into a hypothesis about behavior.

That distinction matters because a failure can occur at several boundaries. A Skill may not load for the request. It may load but choose an incomplete sequence. It may follow the sequence while carrying too much irrelevant context. It may produce a plausible recommendation but lack permission to perform the action. Treating all of these as “the model failed” hides the decision that needs to change.

A coherent path from outcome to capability

Begin with the outcome. A concrete outcome identifies the state or artifact that should exist when the workflow is complete. It also limits what the Skill must own. If the goal is to prepare a sprint plan, the relevant result may include a prioritized set of proposed tasks and an explicit account of capacity. If the goal is to create the tasks in an external system, the boundary extends to authorized state changes and a check that those changes were actually recorded.

From the outcome, define the boundary. The Skill needs to know what it handles and what it leaves to another capability or to the user. A package that claims to manage every project question cannot provide a meaningful activation condition. A package that handles sprint planning but not general project status can write a more precise description and a more focused sequence. Scope is not a limitation added after design; it is what makes the workflow testable.

Activation is the next boundary. The frontmatter description connects a user's language to the package's intended work. It should state what the Skill does and when to use it, using concrete tasks or phrases. The same request can be expressed in different words, so a useful activation boundary must accommodate reasonable paraphrases while excluding nearby work that belongs elsewhere. This is a routing hypothesis, not a guarantee. It needs positive and negative cases.

Execution is the path between activation and outcome. The core instructions should tell the agent what information to gather, what decisions depend on earlier results, which tools to call, and what to validate. The path may consult a reference or invoke a script when the current request needs that detail. It should not rely on a resource that is never made reachable, and it should not imply that an external state changed merely because a tool call was attempted.

Context strategy determines what information is present at each point. Progressive disclosure keeps the trigger description available for relevance, the core instructions available for the active workflow, and deeper references available for conditional detail. That division is useful only when the current decision can find the information it needs. A context strategy that loads everything can bury the next action.