docs: Declare support level for each crate in our Charter / docs

This is to bring us into conformance with the [Rust crate ownership
policy](https://forge.rust-lang.org/policies/crate-ownership.html).

Items of note
- `cargo-credential-1password` is declared as Experimental as it is
  intended for the community but I was unsure if we wanted to commit to
  full support for it.  In my mind, the ideal thing to do would be to
  expatriate this to 1password.
- `home` is declared as Internal despite its wide use within the
  ecosystem.
- `cargo-credential` is declared as Intentional as its an API intended
  for the wider ecosystem and I didn't see a reason to declare it
  experimental.
- `cargo-platform`, `cargo-util-schemas`, and `crates-io` are declared
  as Intentional as they are both used internally and intended for
  others to use for logic that integrates with cargo/registries.
  I wondered about these being Experimental or Internal instead.

README.md

@@ -9,17 +9,19 @@ Cargo downloads your Rust project’s dependencies and compiles your project.
 [The Cargo Book]: https://doc.rust-lang.org/cargo/
 [Cargo Contributor Guide]: https://rust-lang.github.io/cargo/contrib/
 
+> The Cargo binary distributed through with Rust is maintained by the Cargo
+> team for use by the wider ecosystem.
+> For all other uses of this crate (as a binary or library) this is maintained
+> by the Cargo team, primarily for use by Cargo and not intended for external
+> use (except as a transitive dependency). This crate may make major changes to
+> its APIs.
+
 ## Code Status
 
 [![CI](https://github.com/rust-lang/cargo/actions/workflows/main.yml/badge.svg?branch=auto-cargo)](https://github.com/rust-lang/cargo/actions/workflows/main.yml)
 
 Code documentation: <https://doc.rust-lang.org/nightly/nightly-rustc/cargo/>
 
-## Installing Cargo
-
-Cargo is distributed by default with Rust, so if you've got `rustc` installed
-locally you probably also have `cargo` installed locally.
-
 ## Compiling from Source
 
 ### Requirements

benches/benchsuite/README.md

@@ -0,0 +1,3 @@
+> This crate is maintained by the Cargo team, primarily for use by Cargo
+> and not intended for external use. This
+> crate may make major changes to its APIs or be deprecated without warning.

benches/benchsuite/src/lib.rs

@@ -1,3 +1,7 @@
+//! > This crate is maintained by the Cargo team, primarily for use by Cargo
+//! > and not intended for external use. This
+//! > crate may make major changes to its APIs or be deprecated without warning.
+
 #![allow(clippy::disallowed_methods)]
 
 use cargo::GlobalContext;

crates/cargo-platform/README.md

@@ -0,0 +1,2 @@
+> This crate is maintained by the Cargo team for use by the wider
+> ecosystem. This crate follows semver compatibility for its APIs.

crates/cargo-platform/src/lib.rs

@@ -6,6 +6,9 @@
 //!
 //! See `examples/matches.rs` for an example of how to match against a `Platform`.
 //!
+//! > This crate is maintained by the Cargo team for use by the wider
+//! > ecosystem. This crate follows semver compatibility for its APIs.
+//!
 //! [`Platform`]: enum.Platform.html
 
 use std::fmt;

crates/cargo-test-macro/README.md

@@ -1,5 +1,3 @@
-WARNING: You might not want to use this outside of Cargo.
-
-* This is designed for testing Cargo itself. Use at your own risk.
-* No guarantee on any stability across versions.
-* No feature request would be accepted unless proved useful for testing Cargo.
+> This crate is maintained by the Cargo team, primarily for use by Cargo
+> and not intended for external use. This
+> crate may make major changes to its APIs or be deprecated without warning.

crates/cargo-test-macro/src/lib.rs

@@ -3,11 +3,9 @@
 //! This is meant to be consumed alongside `cargo-test-support`. See
 //! <https://rust-lang.github.io/cargo/contrib/> for a guide on writing tests.
 //!
-//! WARNING: You might not want to use this outside of Cargo.
-//!
-//! * This is designed for testing Cargo itself. Use at your own risk.
-//! * No guarantee on any stability across versions.
-//! * No feature request would be accepted unless proved useful for testing Cargo.
+//! > This crate is maintained by the Cargo team, primarily for use by Cargo
+//! > and not intended for external use. This
+//! > crate may make major changes to its APIs or be deprecated without warning.
 
 use proc_macro::*;
 use std::path::Path;

crates/cargo-test-support/README.md

@@ -1,5 +1,3 @@
-WARNING: You might not want to use this outside of Cargo.
-
-* This is designed for testing Cargo itself. Use at your own risk.
-* No guarantee on any stability across versions.
-* No feature request would be accepted unless proved useful for testing Cargo.
+> This crate is maintained by the Cargo team, primarily for use by Cargo
+> and not intended for external use. This
+> crate may make major changes to its APIs or be deprecated without warning.

crates/cargo-test-support/src/lib.rs

@@ -11,11 +11,9 @@
 //!   targeted at cargo contributors
 //!   - Updated on each update of the `cargo` submodule in `rust-lang/rust`
 //!
-//! **WARNING:** You might not want to use this outside of Cargo.
-//!
-//! * This is designed for testing Cargo itself. Use at your own risk.
-//! * No guarantee on any stability across versions.
-//! * No feature request would be accepted unless proved useful for testing Cargo.
+//! > This crate is maintained by the Cargo team, primarily for use by Cargo
+//! > and not intended for external use. This
+//! > crate may make major changes to its APIs or be deprecated without warning.
 //!
 //! # Example
 //!

crates/cargo-util-schemas/README.md

@@ -0,0 +1,2 @@
+> This crate is maintained by the Cargo team for use by the wider
+> ecosystem. This crate follows semver compatibility for its APIs.

crates/cargo-util-schemas/src/lib.rs

@@ -4,6 +4,9 @@
 //! parsing command-lines.
 //! Any logic for getting final semantics from these will likely need other tools to process, like
 //! `cargo metadata`.
+//!
+//! > This crate is maintained by the Cargo team for use by the wider
+//! > ecosystem. This crate follows semver compatibility for its APIs.
 
 pub mod core;
 pub mod manifest;

crates/cargo-util/README.md

@@ -0,0 +1,3 @@
+> This crate is maintained by the Cargo team, primarily for use by Cargo
+> and not intended for external use (except as a transitive dependency). This
+> crate may make major changes to its APIs or be deprecated without warning.

crates/cargo-util/src/lib.rs

@@ -1,4 +1,8 @@
 //! Miscellaneous support code used by Cargo.
+//!
+//! > This crate is maintained by the Cargo team, primarily for use by Cargo
+//! > and not intended for external use (except as a transitive dependency). This
+//! > crate may make major changes to its APIs or be deprecated without warning.
 
 #![allow(clippy::disallowed_methods)]
 

crates/crates-io/README.md

@@ -0,0 +1,2 @@
+> This crate is maintained by the Cargo team for use by the wider
+> ecosystem. This crate follows semver compatibility for its APIs.

crates/crates-io/lib.rs

@@ -1,3 +1,6 @@
+//! > This crate is maintained by the Cargo team for use by the wider
+//! > ecosystem. This crate follows semver compatibility for its APIs.
+
 use std::collections::BTreeMap;
 use std::fs::File;
 use std::io::prelude::*;

crates/home/README.md

@@ -20,6 +20,10 @@ that Cargo and rustup store their data.
 
 See [rust-lang/rust#43321].
 
+> This crate is maintained by the Cargo team, primarily for use by Cargo and Rustup
+> and not intended for external use. This
+> crate may make major changes to its APIs or be deprecated without warning.
+
 [rust-lang/rust#43321]: https://github.com/rust-lang/rust/issues/43321
 
 ## License

crates/home/src/lib.rs

@@ -16,6 +16,10 @@
 //!
 //! See also this [discussion].
 //!
+//! > This crate is maintained by the Cargo team, primarily for use by Cargo and Rustup
+//! > and not intended for external use. This
+//! > crate may make major changes to its APIs or be deprecated without warning.
+//!
 //! [discussion]: https://github.com/rust-lang/rust/pull/46799#issuecomment-361156935
 
 #![allow(clippy::disallowed_methods)]

crates/mdman/README.md

@@ -2,6 +2,10 @@
 
 mdman is a small utility for creating man pages from markdown text files.
 
+> This crate is maintained by the Cargo team, primarily for use by Cargo
+> and not intended for external use (except as a transitive dependency). This
+> crate may make major changes to its APIs or be deprecated without warning.
+
 ## Usage
 
 See the [man page](doc/out/mdman.md) generated by this tool.

crates/mdman/src/lib.rs

@@ -1,4 +1,8 @@
 //! mdman markdown to man converter.
+//!
+//! > This crate is maintained by the Cargo team, primarily for use by Cargo
+//! > and not intended for external use (except as a transitive dependency). This
+//! > crate may make major changes to its APIs or be deprecated without warning.
 
 use anyhow::{bail, Context, Error};
 use pulldown_cmark::{CowStr, Event, LinkType, Options, Parser, Tag, TagEnd};

crates/resolver-tests/README.md

@@ -5,6 +5,10 @@
 This crate aims to test the resolution of Cargo's resolver. It implements a [SAT solver](https://en.wikipedia.org/wiki/SAT_solver) to compare with resolution of Cargo's resolver.    
 This ensures that Cargo's dependency resolution is proven valid by lowering to [SAT problem](https://en.wikipedia.org/wiki/Boolean_satisfiability_problem). 
 
+> This crate is maintained by the Cargo team, primarily for use by Cargo
+> and not intended for external use (except as a transitive dependency). This
+> crate may make major changes to its APIs or be deprecated without warning.
+
 ## About the test
 
 The Cargo's resolver is very sensitive to what order it tries to evaluate constraints. This makes it incredibly difficult     

crates/resolver-tests/src/lib.rs

@@ -1,3 +1,7 @@
+//! > This crate is maintained by the Cargo team, primarily for use by Cargo
+//! > and not intended for external use (except as a transitive dependency). This
+//! > crate may make major changes to its APIs or be deprecated without warning.
+
 #![allow(clippy::print_stderr)]
 
 use std::cmp::{max, min};

crates/rustfix/README.md

@@ -9,6 +9,10 @@ This is a low-level library. You pass it the JSON output from `rustc`, and you c
 
 If you are looking for the [`cargo fix`] implementation, the core of it is located in [`cargo::ops::fix`].
 
+> This crate is maintained by the Cargo team, primarily for use by Cargo and Rust compiler test suite
+> and not intended for external use (except as a transitive dependency). This
+> crate may make major changes to its APIs or be deprecated without warning.
+
 [`cargo fix`]: https://doc.rust-lang.org/cargo/commands/cargo-fix.html
 [`cargo::ops::fix`]: https://github.com/rust-lang/cargo/blob/master/src/cargo/ops/fix.rs
 

crates/rustfix/src/lib.rs

@@ -18,6 +18,10 @@
 //! 3. Create a [`CodeFix`] with the source of a file to modify.
 //! 4. Call [`CodeFix::apply`] to apply a change.
 //! 5. Call [`CodeFix::finish`] to get the result and write it back to disk.
+//!
+//! > This crate is maintained by the Cargo team, primarily for use by Cargo and Rust compiler test suite
+//! > and not intended for external use (except as a transitive dependency). This
+//! > crate may make major changes to its APIs or be deprecated without warning.
 
 use std::collections::HashSet;
 use std::ops::Range;

credential/cargo-credential-1password/README.md

@@ -2,6 +2,11 @@
 
 A Cargo [credential provider] for [1password].
 
+> This crate is maintained by the Cargo team as a part of an experiment around
+> 1password integration. We encourage people to try to use this crate in their projects and
+> provide feedback through [issues](https://github.com/rust-lang/cargo/issues/), but do not
+> guarantee long term maintenance.
+
 ## Usage
 
 `cargo-credential-1password` uses the 1password `op` CLI to store the token. You

credential/cargo-credential-1password/src/main.rs

@@ -1,4 +1,9 @@
 //! Cargo registry 1password credential process.
+//!
+//! > This crate is maintained by the Cargo team as a part of an experiment around
+//! > 1password integration. We encourage people to try to use this crate in their projects and
+//! > provide feedback through [issues](https://github.com/rust-lang/cargo/issues/), but do not
+//! > guarantee long term maintenance.
 
 #![allow(clippy::disallowed_methods)]
 #![allow(clippy::print_stderr)]

credential/cargo-credential-libsecret/README.md

@@ -5,5 +5,9 @@ See the [credential-provider] documentation for how to use this.
 
 This credential provider is built-in to cargo as `cargo:libsecret`.
 
+> This crate is maintained by the Cargo team, primarily for use by Cargo
+> and not intended for external use (except as a transitive dependency). This
+> crate may make major changes to its APIs or be deprecated without warning.
+
 [GNOME libsecret]: https://wiki.gnome.org/Projects/Libsecret
 [credential-provider]: https://doc.rust-lang.org/nightly/cargo/reference/registry-authentication.html

credential/cargo-credential-libsecret/src/lib.rs

@@ -1,3 +1,7 @@
+//! > This crate is maintained by the Cargo team, primarily for use by Cargo
+//! > and not intended for external use (except as a transitive dependency). This
+//! > crate may make major changes to its APIs or be deprecated without warning.
+
 #[cfg(target_os = "linux")]
 mod linux {
     //! Implementation of the libsecret credential helper.

credential/cargo-credential-macos-keychain/README.md

@@ -5,6 +5,10 @@ See the [credential-provider] documentation for how to use this.
 
 This credential provider is built-in to cargo as `cargo:macos-keychain`.
 
+> This crate is maintained by the Cargo team, primarily for use by Cargo
+> and not intended for external use (except as a transitive dependency). This
+> crate may make major changes to its APIs or be deprecated without warning.
+
 [macOS Keychain]: https://support.apple.com/guide/keychain-access/welcome/mac
 [credential-provider]: https://doc.rust-lang.org/nightly/cargo/reference/registry-authentication.html
 

credential/cargo-credential-macos-keychain/src/lib.rs

@@ -1,4 +1,8 @@
 //! Cargo registry macos keychain credential process.
+//!
+//! > This crate is maintained by the Cargo team, primarily for use by Cargo
+//! > and not intended for external use (except as a transitive dependency). This
+//! > crate may make major changes to its APIs or be deprecated without warning.
 
 #![allow(clippy::print_stderr)]
 

credential/cargo-credential-wincred/README.md

@@ -5,5 +5,9 @@ See the [credential-provider] documentation for how to use this.
 
 This credential provider is built-in to cargo as `cargo:wincred`.
 
+> This crate is maintained by the Cargo team, primarily for use by Cargo
+> and not intended for external use (except as a transitive dependency). This
+> crate may make major changes to its APIs or be deprecated without warning.
+
 [Windows Credential Manager]: https://support.microsoft.com/en-us/windows/accessing-credential-manager-1b5c916a-6a16-889f-8581-fc16e8165ac0
 [credential-provider]: https://doc.rust-lang.org/nightly/cargo/reference/registry-authentication.html

credential/cargo-credential-wincred/src/lib.rs

@@ -1,4 +1,8 @@
 //! Cargo registry windows credential process.
+//!
+//! > This crate is maintained by the Cargo team, primarily for use by Cargo
+//! > and not intended for external use (except as a transitive dependency). This
+//! > crate may make major changes to its APIs or be deprecated without warning.
 
 #[cfg(windows)]
 mod win {

credential/cargo-credential/README.md

@@ -10,6 +10,9 @@ https://doc.rust-lang.org/nightly/cargo/reference/credential-provider-protocol.h
 Example implementations may be found at
 https://github.com/rust-lang/cargo/tree/master/credential
 
+> This crate is maintained by the Cargo team for use by the wider
+> ecosystem. This crate follows semver compatibility for its APIs.
+
 ## Usage
 
 Create a Cargo project with this as a dependency:

credential/cargo-credential/src/lib.rs

@@ -12,6 +12,9 @@
 //! While in the `perform` function, stdin and stdout will be re-attached to the
 //! active console. This allows credential providers to be interactive if necessary.
 //!
+//! > This crate is maintained by the Cargo team for use by the wider
+//! > ecosystem. This crate follows semver compatibility for its APIs.
+//!
 //! ## Error handling
 //! ### [`Error::UrlNotSupported`]
 //! A credential provider may only support some registry URLs. If this is the case

src/cargo/lib.rs

@@ -7,9 +7,10 @@
 //! - <https://doc.rust-lang.org/nightly/nightly-rustc/cargo>: targeted at cargo contributors
 //!   - Updated on each update of the `cargo` submodule in `rust-lang/rust`
 //!
-//! **WARNING:** Using Cargo as a library has drawbacks, particularly the API is unstable,
-//! and there is no clear path to stabilize it soon at the time of writing.  See [The Cargo Book:
-//! External tools] for more on this topic.
+//! > This library is maintained by the Cargo team, primarily for use by Cargo
+//! > and not intended for external use (except as a transitive dependency). This
+//! > crate may make major changes to its APIs. See [The Cargo Book:
+//! > External tools] for more on this topic.
 //!
 //! ## Overview
 //!

src/doc/contrib/src/team.md

@@ -166,6 +166,15 @@ The degree of process is correlated with the degree of change being proposed:
 [Stable backports]: process/release.md#stable-backports
 [SemVer chapter]: https://doc.rust-lang.org/cargo/reference/semver.html
 
+## Intentional Artifacts
+
+Per the [Rust crate ownership policy](https://forge.rust-lang.org/policies/crate-ownership.html), the Cargo team's "Intentional Artifacts" include:
+
+- [cargo-credential](https://crates.io/crates/cargo-credential)
+- [cargo-platform](https://crates.io/crates/cargo-platform)
+- [cargo-util-schemas](https://crates.io/crates/cargo-util-schemas)
+- [crates-io](https://crates.io/crates/crates-io)
+
 ## Contacting the team
 
 The team may be contacted through several channels: