Bookworm

A collection of tools to work with docs.rs documentation.

Crates

wrm_dl

Download the documentation for a crate from docs.rs and store it in a local directory.

It comes both as a library and a binary, you can run it locally using:

cargo run --bin wrm-dl --features cli -- regex
Documentation downloaded successfully to /tmp/...

wrm_index

Index locally stored crate documentation into a SQLite database.

It comes both as a library and a binary, you can run it locally using:

cargo run --bin wrm-index --features cli -- /tmp/...
Documentation indexed successfully to ./index.sqlite

wrm_query

Query the documentation for a crate, using a locally stored version of the crate documentation, and the index database.

wrm_docs

Fetch details from locally cached docs.rs documentation.

wrm_mcp

A model context protocol server to serve the documentation for a crate.

Run it locally using:

cargo run --bin wrm-mcp

Adding the server to your MCP client depends on the client, but the following example works for Claude.ai:

{
  "mcpServers": {
    "bookworm": {
      "command": "/path/to/wrm-mcp"
    }
  }
}

Tools

The following tools are available to an LLM with MCP client capabilities:

crates_search

Get a list of crates matching the given query.

The returned list contains a list of URIs for each crate to fetch additional crate information.

crate_search_items

Get a list of items matching the given query.

Each item type contains the following information:

• Item Path (e.g. serde_json::value::Value)
• Item Type (e.g. enum)
• Type Signature
• Documentation
• Related Resource URIs

crate_search_src (TODO)

Search all the crate's source code for a given query.

Each item contains the URI of the source code file, the line number, and the contents of the matched line, including any optional context surrounding the match.

crate_resource

Once you find a crate (or know the crate name), you can fetch relevant resources through the crate_resource tool. This tool takes a URI to the resource.

The following URIs are supported:

• crate://{crate_name} - list crate versions
• crate://{crate_name}/{crate_version} - get metadata
• crate://{crate_name}/{crate_version}/readme - get readme content
• crate://{crate_name}/{crate_version}/items - list item resources
• crate://{crate_name}/{crate_version}/src - list source code resources
• crate://{crate_name}/{crate_version}/{path} - get item/src resource

crate://{crate_name} - list crate versions

Returns a list of crate versions for the given crate name.

Each item in the list contains the following information:

• Version
• Release Date
• MSRV
• Downloads
• Publisher

crate://{crate_name}/{crate_version} - get crate metadata

The following metadata is returned:

• Name
• Version
• Release Date
• Description
• Homepage
• Repository
• License
• URIs:
  • Readme (e.g. crate://serde_json/1.0.85/readme)
  • Crate Item (e.g. crate://serde_json/1.0.85/items)
  • Source code (e.g. crate://serde_json/1.0.85/src)

crate://{crate_name}/{crate_version}/readme - get crate readme

Returns the crate README as a string, formatted as Markdown.

crate://{crate_name}/{crate_version}/items - list crate items

Returns a list of items for the given crate version.

An item is a component of a crate. There are several kinds of items:

• Modules
• Function definitions
• Type definitions
• Struct definitions
• Enumeration definitions
• Trait definitions
• Implementations

Use search_crate_items to search for specific items.

crate://{crate_name}/{crate_version}/src - list crate source code resources

Returns a list of source code resources for the given crate version.

For Example:

<Resources>
  <Resource uri="crate://serde_json/1.0.85/src/serde_json/lib.rs" />
  <Resource uri="crate://serde_json/1.0.85/src/serde_json/value.rs" />
  <Resource uri="crate://serde_json/1.0.85/src/serde_json/map.rs" />
  <Resource uri="crate://serde_json/1.0.85/src/serde_json/value/mod.rs" />
  ...
</Resources>

Use search_crate_src to search all the crate's source code.

crate://{crate_name}/{crate_version}/{crate_resource_path} - get crate resource

Returns the content of the resource at the given path.

Url Templating

• {crate_name} is the exact name of the crate.
• {crate_version} is either a (partial) semver compatible version number, or latest for the latest published crate version.