By name: rust-std-docs description: Search and browse the Rust standard library documentation at doc.rust-lang.org. Use this skill when you need to look up types, traits, functions, macros, or modules from the Rust std library.
What I do
Look up Rust standard library documentation by fetching pages from https://doc.rust-lang.org/stable/std/.
When to use me
Use this skill when you need to:
- Look up the API of a standard library type, trait, function, or macro
- Check method signatures or available trait implementations
- Find which module a type lives in
- Read documentation examples for standard library items
- Verify behavior of std functions before using them in code
How to search
The Rust standard library docs follow a predictable URL structure. Use the webfetch tool to fetch the relevant page.
URL patterns
All URLs are rooted at https://doc.rust-lang.org/stable/std/.
| What you're looking for | URL pattern | Example |
|---|---|---|
| Module overview | std/{module}/index.html |
std/collections/index.html |
| Struct | std/{module}/struct.{Name}.html |
std/collections/struct.HashMap.html |
| Enum | std/{module}/enum.{Name}.html |
std/option/enum.Option.html |
| Trait | std/{module}/trait.{Name}.html |
std/iter/trait.Iterator.html |
| Function | std/{module}/fn.{name}.html |
std/mem/fn.replace.html |
| Macro | std/macro.{name}.html |
std/macro.vec.html |
| Primitive type | std/primitive.{name}.html |
std/primitive.str.html |
| Constant | std/{module}/constant.{NAME}.html |
std/f64/constant.PI.html |
| Type alias | std/{module}/type.{Name}.html |
std/io/type.Result.html |
Nested modules
For items in nested modules, add the module path:
std/sync/atomic/struct.AtomicBool.htmlstd/collections/hash_map/struct.HashMap.htmlstd/io/struct.BufReader.html
Common lookups
Here are the most frequently needed pages:
- Collections:
std/collections/index.html— HashMap, BTreeMap, HashSet, VecDeque, etc. - String:
std/string/struct.String.html - Vec:
std/vec/struct.Vec.html - Option:
std/option/enum.Option.html - Result:
std/result/enum.Result.html - Iterator:
std/iter/trait.Iterator.html - Error trait:
std/error/trait.Error.html - fmt::Display:
std/fmt/trait.Display.html - Read/Write:
std/io/trait.Read.html,std/io/trait.Write.html - Path/PathBuf:
std/path/struct.PathBuf.html,std/path/struct.Path.html - File:
std/fs/struct.File.html - fs module:
std/fs/index.html - HashMap:
std/collections/struct.HashMap.html - Arc:
std/sync/struct.Arc.html - Mutex:
std/sync/struct.Mutex.html
Search strategy
- If you know the exact type/trait/function name, construct the URL directly using the patterns above.
- If you're unsure which module it's in, start with the std index:
std/index.html. - If looking for a specific module's contents, fetch
std/{module}/index.html. - Fetch the page using
webfetchand read the relevant sections.
Example
To look up how HashMap::entry works:
webfetch("https://doc.rust-lang.org/stable/std/collections/struct.HashMap.html")
Then search the returned content for the entry method.