chore: release

[jdx]

https://entire.io/gh/jdx/mr-boxington/trails/13

🤖 New release

• mbx-cache-core: 0.17.1 -> 0.18.0 (⚠ API breaking changes)
• mbx-cache-cc: 0.17.1 -> 0.18.0
• mbx-cache-rustc: 0.17.1 -> 0.18.0
• mbx: 1.15.0 -> 1.16.0 (✓ API compatible changes)
• mbx-cache-cargo: 0.3.3 -> 0.3.4
• mbx-cache-store: 0.1.29 -> 0.1.30

⚠ mbx-cache-core breaking changes

--- failure constructible_struct_adds_field: struct exhaustively constructible through public API adds field ---

Description:
A pub struct that could be exhaustively constructed with a literal using only public API has a new pub field, breaking existing exhaustive literals.
        ref: https://doc.rust-lang.org/reference/expressions/struct-expr.html
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.50.0/src/lints/constructible_struct_adds_field.ron

Failed in:
  field RestoreStats.hardlinked_output_files in /tmp/.tmpOCwrfP/mr-boxington/crates/mbx-cache-core/src/agent/wire.rs:378
  field RestoreStats.hardlinked_output_bytes in /tmp/.tmpOCwrfP/mr-boxington/crates/mbx-cache-core/src/agent/wire.rs:380

Changelog

mbx-cache-core

0.18.0 - 2026-09-23

Added

• (cache-core) [breaking] account for hard-linked outputs in restore statistics (#514)

mbx-cache-cc

0.17.1 - 2026-09-20

Added

• (target) adopt existing target directories without deleting outputs (#499)

mbx-cache-rustc

0.17.1 - 2026-09-20

Added

• (target) adopt existing target directories without deleting outputs (#499)

mbx

1.16.0 - 2026-09-23

Added

• (scheduler) run cargo test binaries under the machine-wide permit pool (#513)

Fixed

• (cc) stop other mbx installations sharing a cache from breaking C builds (#516)
• (target) keep view collection's activity window on one clock (#512)
• (cache) allow private persistent compiler shim directories (#501)
• (cache) stop native archive timestamps from missing cached actions (#506)
• (gc) run automatic cleanup from cargo hardlink installations (#505)
• (cc) stop two mbx installations from picking each other's compiler shims (#504)
• (cargo) preserve target directories in nested builds (#502)

Other

• (cache) hard link cached outputs where the filesystem cannot clone them (#511)

mbx-cache-cargo

0.3.4 - 2026-09-23

Other

• updated the following local packages: mbx-cache-core

mbx-cache-store

0.1.30 - 2026-09-23

Other

• updated the following local packages: mbx-cache-core

---

This PR was generated with release-plz.

---

Note

Medium Risk
Release metadata only in the PR, but it ships a breaking mbx-cache-core API change and many cache/CC behavioral fixes that affect build correctness and multi-install setups.

Overview
This is a release-plz cut that bumps crate versions, refreshes Cargo.lock, and records 1.16.0 / 0.18.0 (and dependent crate) entries in changelogs and CLI docs—no application source changes in the diff itself.

mbx 1.15.0 → 1.16.0 documents scheduler behavior for cargo test under the machine-wide permit pool, cache restore improvements (hard links when clone/reflink isn’t available), and fixes for multi-install C/C++ shim isolation, nested Cargo targets, archive timestamp cache keys, GC from hardlink installs, and related cache/target edge cases.

mbx-cache-core 0.17.1 → 0.18.0 is a breaking embedder release: RestoreStats gains hardlinked_output_files and hardlinked_output_bytes so restore accounting separates hard-linked outputs from reflinks and copies. mbx-cache-cc, mbx-cache-rustc, mbx-cache-cargo, and mbx-cache-store are re-versioned to depend on 0.18.0 core.

^{Reviewed by Cursor Bugbot for commit 33cd2e0. Bugbot is set up for automated code reviews on this repo. Configure here.}

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📝 Walkthrough

Walkthrough

The mbx package version and CLI documentation were updated to 1.15.1. The changelog records five fixes for compiler-shim directories, native archive timestamps, Cargo hardlink cleanup, shim isolation, and nested-build target-directory preservation.

Changes

mbx release metadata

Layer / File(s)	Summary
Update release metadata crates/mbx/Cargo.toml, docs/cli/index.md, crates/mbx/CHANGELOG.md	The package version and CLI documentation were updated to 1.15.1. The changelog records five fixes.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to bc89f

This release updates version metadata, documentation, and the changelog; no merge-blocking production impact is evidenced.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Title check	❓ Inconclusive	The title identifies a release but does not specify the package or version. It is too generic for clear change tracking.	Use a specific title such as "chore: release mbx 1.15.1".

✅ Passed checks (4 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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[greptile-apps]

Confidence Score: 4/5

The PR is not yet safe to merge because stale-shim collection can delete a directory concurrently reactivated by another build session.

Summary

This release updates workspace package versions, local cache-crate dependency constraints, the lockfile, generated CLI version documentation, and changelogs for the 2026-09-23 release. Changes since the prior review also include per-installation native shims and CMake launcher migration behavior.

• Releases mbx 1.16.0 and mbx-cache-core 0.18.0.
• Updates dependent cache crates to compatible package versions.
• Documents the breaking RestoreStats field additions.
• Adds persistent per-installation native shims and stale-shim collection.

_{Reviews (13) · Last reviewed commit: "docs: update generated CLI reference"}

[github-actions]

Instruction counts

Nothing was compared, and so nothing was gated. No series appears on both sides: either the base has no measurements recorded, or the two were measured on different runner classes, which are deliberately not comparable — counts shift between machine types by more than a real regression does.

New, nothing to compare against: mbx_help on jdx-perf-v1-ubuntu24.04-x64-mr-boxington-rust1.97.1-img5263c143, startup_control on jdx-perf-v1-ubuntu24.04-x64-mr-boxington-rust1.97.1-img5263c143

_{Only instruction counts gate. Wall clock is shown for context — on identical hardware it moves 4-20% run to run.}

_{Measured by tak — instruction-counted CLI benchmarks, stored in this repository's git notes.}

_{33cd2e0fa0c0 vs 88c09606cdc0 · measured on jdx-perf-v1.}

Dismissed because a newer commit was pushed; Greptile will re-review the current head.

Dismissed because a newer commit was pushed; Greptile will re-review the current head.

Dismissed because a newer commit was pushed; Greptile will re-review the current head.

Dismissed because a newer commit was pushed; Greptile will re-review the current head.

Dismissed because a newer commit was pushed; Greptile will re-review the current head.

Dismissed because a newer commit was pushed; Greptile will re-review the current head.

Dismissed because a newer commit was pushed; Greptile will re-review the current head.

Dismissed because a newer commit was pushed; Greptile will re-review the current head.