Yes. Claude Code can select a custom Skill automatically when it judges the Skill’s description to be relevant to your request. That is relevance-based selection, not a guarantee that every related prompt will trigger it. You can also invoke a Skill explicitly when you want to remove that ambiguity.
How Claude Code decides whether to use a Skill
Anthropic describes a staged process: Claude receives Skill metadata at startup, then matches a request against each Skill’s description. The description should explain both what the Skill does and when it should be used. When Claude selects a Skill, it reads the instructions in SKILL.md and can access referenced resources as needed. This keeps the full instructions from every Skill from being loaded at startup. Anthropic’s Agent Skills overview explains this process.
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Anthropic also describes Claude scanning available Skills for relevant matches and accessing a Skill when it is relevant to the task. The documentation does not describe a fixed keyword list or a threshold that guarantees a match. Anthropic’s Skills announcement provides that broader explanation.
Automatic selection versus explicit invocation
| Invocation mode | What happens | When it is useful |
|---|---|---|
| Automatic selection | Claude compares your request with available Skill descriptions and may select a relevant Skill. | When the task fits a Skill and you are comfortable letting Claude decide whether it applies. |
| Explicit invocation | You directly ask Claude to use a particular Skill, reducing uncertainty about whether that Skill is intended. | When you specifically want that Skill used for the task. |
The distinction is not that automatic selection is unavailable: Claude Code supports it. Rather, automatic selection is conditional, while an explicit request makes your intent clearer. Anthropic’s general prompting guidance recommends direct instructions and explicitly asking for tool use when you intend an action; it does not establish a guaranteed Skill trigger. Anthropic’s prompting guidance
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How to write a Skill description
Make the description concrete enough to connect the Skill to an actual request. State the work it performs and the circumstances in which it applies, rather than relying on a broad topic label or assuming that one keyword will trigger it. This follows Anthropic’s guidance for Skill descriptions, but does not guarantee selection: Claude still judges relevance.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the “38 runs” title does—and does not—establish
The available documentation supports the claim that Claude Code can discover and select Skills automatically. It does not substantiate a 38-run experiment, identify seven description variants, or report a success rate or test conditions. Without the underlying run records, those figures cannot be treated as verified results, and no conclusion about which wording performs best follows from the title alone.
A related Anthropic explanation about MCP says Claude calls an available tool when a request corresponds to its described function, including implicit requests, while a general question about a connected service does not itself prompt a tool call. That is an analogy about matching requests to capabilities, not direct evidence about how Claude selects Skills. Anthropic’s MCP guidance
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