> For the complete documentation index, see [llms.txt](https://docs.urbit.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.urbit.org/hoon/limbs.md). # Limbs and wings Introduction to limbs and wings in Hoon, which provide the primary mechanism for accessing data from the subject without traditional scope or environment concepts. One feature Hoon lacks: a context that isn't a first-class value. Hoon has no concept of scope, environment, etc. An expression has exactly one data source, the subject, a noun like any other. * [Limbs](/hoon/limbs/limb.md) - A limb is used to resolve to a piece of data in the subject. A wing is thus a resolution path into the subject. * [Wings](/hoon/limbs/wing.md) - In Hoon we use 'wings' to extract information from the subject. A wing is a list of limbs (including a trivial list of one limb). --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation by asking a question. Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters: ``` GET https://docs.urbit.org/hoon/limbs.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.