Claude Skills vs Agents
The practical boundary
The difference is easier to understand as knowledge versus delegated ownership.
A skill supplies a repeatable way to perform a task. It may contain instructions, examples, scripts, references, or templates. Claude loads the relevant material into the current workflow.
An agent owns a task as a worker. Depending on the platform, it may have separate instructions, context, tools, and a reasoning loop. You delegate a goal to it and receive a result.
That means “review code using our severity rubric” is skill-shaped. “Take this pull request, inspect the implementation independently, run relevant checks, and report findings back to the main conversation” is agent-shaped. The review agent can use the review skill.
Comparison table
| Question | Claude Skill | Agent |
|---|---|---|
| Primary job | Supply reusable knowledge and procedure | Own and execute a delegated task |
| Basic unit | Folder with SKILL.md and optional resources | Agent definition, prompt, tools, and execution context |
| Activation | Loaded when task and description match, or invoked explicitly | Called or delegated by a user, workflow, or another agent |
| Context | Adds relevant instructions to the current work | Often operates in an isolated or separate context |
| Planning | Can prescribe a procedure | Can decide how to pursue a goal within its instructions |
| Tools | Explains how to use available tools; may include scripts | Receives an allowed tool set and can call it during execution |
| Output | Improves how a task is done | Returns the result of delegated work |
| Best fit | Repeated method, format, checklist, or domain knowledge | Parallel work, specialist investigation, or bounded ownership |
Use a skill when
- The same method repeats across projects or conversations.
- The procedure has recognizable trigger conditions.
- The work should stay in the current conversation or task.
- Reference files, templates, or deterministic scripts improve consistency.
- You want to update one workflow without creating another worker.
A release checklist, spreadsheet-cleaning procedure, brand style system, or systematic debugging method is usually a skill first. The user still owns the task; the skill changes how Claude performs it.
Use an agent when
- A subtask needs an independent context so it does not flood the main thread.
- Several tasks should run in parallel.
- A specialist should investigate and report back without steering the whole project.
- The work needs a bounded tool set or dedicated instructions.
- Another workflow must delegate ownership and wait for a result.
Examples include a security reviewer inspecting one change, a research agent collecting evidence, or a test agent reproducing a failure while the main task continues elsewhere.
Use both when
The strongest design often combines them:
- The agent receives a narrow objective and permitted tools.
- A skill supplies the method or rubric.
- The agent gathers evidence and follows the skill’s ordered checks.
- The agent returns a structured result to the calling workflow.
For example, a code-review agent can load a review skill that defines severity levels, evidence requirements, and output format. The agent provides context isolation and delegated execution. The skill provides the reusable editorial method.
The Subagent-Driven Development, Dispatching Parallel Agents, and Requesting Code Review profiles show different parts of this composition. These are source-based profiles, not hands-on ratings.
Common design mistakes
Creating an agent for every checklist
A separate worker adds coordination, context transfer, and result-merging costs. If the procedure is narrow and should run in the current task, start with a skill.
Turning a skill into an autonomous system
A skill can contain a sophisticated workflow, but it does not become a separate actor merely because the instructions are long. If the work needs independent ownership, explicit delegation, or parallel execution, use an agent.
Giving a broad agent every skill
Overlapping skill descriptions can create noisy activation and unpredictable context. Give the agent the smallest relevant set and make every skill description distinct.
Assuming isolation guarantees safety
A separate agent context does not make untrusted instructions or tools safe. Review permissions, sources, scripts, and data boundaries in both the agent definition and any skills it can load.
Decision rule
Start with a skill when your sentence begins with “whenever we do this task, follow this method.” Start with an agent when it begins with “delegate this bounded outcome to a separate worker.” Combine them when the worker needs a repeatable method.
For adjacent architecture choices, compare Skills vs Plugins and Skills vs MCP. For the underlying format, read What Is a Claude Skill?.
Primary sources
FAQ
Are Claude Skills the same as agents?
No. A skill is reusable instructions and resources for a task. An agent is a delegated worker or system that plans and executes work in its own context.
Can a Claude agent use skills?
Yes. A skill can supply a method, checklist, or domain procedure that an agent follows while the agent owns planning, tools, and execution.
Should I create a skill or an agent?
Create a skill when the same procedure should be reusable without a separate worker. Create an agent when the task needs delegated ownership, context isolation, or an independent reasoning loop.
Can one agent use multiple skills?
Yes. An agent can combine narrow skills for research, analysis, writing, verification, or other stages, provided their activation rules do not conflict.
Do skills save context compared with agents?
Skills use progressive disclosure so detailed instructions load when relevant. Agents can isolate a subtask in a separate context. They manage context in different ways and can be combined.