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feat: discourage the use of the --all-features flag (#12429)

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## Why

Developers are frequently running low on disk space, and routine use of
`--all-features` contributes to larger Cargo build caches in `target/`
by compiling additional feature combinations.

This change updates local workflow guidance to avoid `--all-features` by
default and reserve it for cases where full feature coverage is
specifically needed.

## What Changed

- Updated `AGENTS.md` guidance for `codex-rs` to recommend `cargo test`
/ `just test` for full-suite local runs, and to call out the disk-usage
cost of routine `--all-features` usage.
- Updated the root `justfile` so `just fix` and `just clippy` no longer
pass `--all-features` by default.
- Updated `docs/install.md` to explicitly describe `cargo test
--all-features` as an optional heavier-weight run (more build time and
`target/` disk usage).

## Verification

- Confirmed the `justfile` parses and the recipes list successfully with
`just --list`.
This commit is contained in:
Michael Bolin
2026-02-20 23:02:24 -08:00
committed by GitHub
parent a8b4b569fb
commit 264fc444b6
3 changed files with 8 additions and 4 deletions
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AGENTS.md
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@@ -24,7 +24,7 @@ In the codex-rs folder where the rust code lives:
Run `just fmt` (in `codex-rs` directory) automatically after you have finished making Rust code changes; do not ask for approval to run it. Additionally, run the tests:
1. Run the test for the specific project that was changed. For example, if changes were made in `codex-rs/tui`, run `cargo test -p codex-tui`.
2. Once those pass, if any changes were made in common, core, or protocol, run the complete test suite with `cargo test --all-features`. project-specific or individual tests can be run without asking the user, but do ask the user before running the complete test suite.
2. Once those pass, if any changes were made in common, core, or protocol, run the complete test suite with `cargo test` (or `just test` if `cargo-nextest` is installed). Avoid `--all-features` for routine local runs because it expands the build matrix and can significantly increase `target/` disk usage; use it only when you specifically need full feature coverage. project-specific or individual tests can be run without asking the user, but do ask the user before running the complete test suite.
Before finalizing a large change to `codex-rs`, run `just fix -p <project>` (in `codex-rs` directory) to fix any linter issues in the code. Prefer scoping with `-p` to avoid slow workspace‑wide Clippy builds; only run `just fix` without `-p` if you changed shared crates. Do not re-run tests after running `fix` or `fmt`.