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Changelog - Echo

Echo is our high-performance work-stealing task scheduler - the Rust crate Mountain pulls in for fan-out workloads where a single tokio runtime would either contend or under-saturate. This file records what we built in our voice, version by version. Format adapted from Keep a Changelog.

[v2.1] - Full Workbench Lift (April 2026)

We did a documentation and surface-polish pass on Echo while the rest of the workbench-lift cycle was happening around it.

Added

  • Comprehensive CHANGELOG history rebuilt from the commit record on 2026-04-16 / 2026-04-17 (bb47864, 6e05393).
  • Crate-level rustdoc rewritten benefit-first in Library.rs (416b0f7, 2026-04-04) so cargo doc lands a meaningful landing page for the scheduler.
  • README expansion with a comprehensive getting-started guide (7435fd3, 2026-04-05) and a problem-first opening pass (9b0b68b, 2026-04-04). Architecture overview links added under See Also (bfb451c).

Changed

  • build.rs cleanup: imports moved to the top, allow attribute added (89ce4ca, 2026-04-20) so a clean cargo build produces no warnings.
  • CHANGELOG formatting standardised (4c5f86f, 2026-04-21).

[v2.0] - Editor Launch (Q1 2026)

We carried the scheduler through the editor-launch cycle without breaking the Mountain integration. The workbench-fix commits in this window (aa2b4f9, 416e963, both labelled "fix(workbench)") were where Echo's call sites in Mountain stabilised against the new workbench boot order.

Changed

  • Workbench fixes (2026-02-13, 2026-02-14) - the consumer side in Mountain learned to schedule its fan-out work through Echo cleanly during the new bundled-electron boot path.

[v1.3] - Dependency Maintenance (Q4 2025)

@cloudflare/workers-types, wrangler, and miniflare rolled forward continuously. No source changes - the crate stayed stable through the back half of the year.

[v1.2] - Full-Stack Integration (Q3 2025)

tsconfig updated for declaration generation (2a22ebc, 2025-07-03). Documentation example formatting fixed (6ed8a51, 2025-07-06). Routine @cloudflare/workers-types and miniflare rolls.

[v1.1] - Architecture Buildout (Scheduler Pivot, June 2025)

The pivot cycle. Echo went from a hybrid scaffold to a real Rust work-stealing scheduler with a published API surface.

Added

  • Scheduler / Queue / Task module split (c92ea95, 2025-06-10). First substantive Rust source landed:
    • Source/Scheduler/{Scheduler,SchedulerBuilder,Worker}.rs
    • Source/Queue/StealingQueue.rs
    • Source/Task/{Task,Priority}.rs
    • Source/Library.rs as the crate root.
  • PascalCase module conversion in the same window - the initial lowercase scheduler/, queue/, task/ directories from 64fca95 were re-spelled to Scheduler/, Queue/, Task/ to match the project rule.
  • Deep Dive document outlining scheduler architecture (eab1531, 2025-06-08).
  • README rewrite aligned with Land architecture and technical details (9841b98, 2025-06-08).
  • Performance optimisation roadmap + contribution guide (0f25c85, d88c3e7, 2025-06-10).
  • Mountain/Scheduler core module documentation (b555aa6, 2025-06-10) - the consumer-side docs landed alongside the producer.

Changed

  • Scheduler decoupled from queue (6d265a0, 2025-06-10). Made the work-stealing path a first-class concern instead of an implementation detail buried in scheduler init.
  • Scheduler APIs exposed, worker task polling optimised (64fca95, 2025-06-10).
  • Code clarity, documentation, and API consistency sweep (a16d402, 2025-06-19).
  • Cargo.toml metadata reorganised, build artefact updated (fb9f4d1, 2025-06-20).
  • Unused dependencies and dev features removed (d8f7788, 2025-06-11).
  • Release-build configuration optimised, dependency-version conflict resolved (7158ac9, 2025-05-29).

[v1.0] - Integration Phase (May 2025)

We sorted out licensing and the build before the June scheduler buildout.

Changed

  • Re-licensed to CC0 1.0 Universal (f4b30ec, 2025-05-22).
  • Migrated from CC0 to Land Public License v1.0 (32589c4, 2025-05-10) - the licence we converged on across the fleet.
  • Documentation URLs normalised to lowercase (0dbaf96, 2025-05-20).
  • @playform/build bumped to 0.2.4 (0c8980f, 2025-05-07).

[v0.2] - Architecture Solidification (Q4 2024)

The crate sat in maintenance through the back half of 2024 while the fleet's Rust-side architecture firmed up around it. Routine @cloudflare/workers-types and tooling rolls; no substantive source changes in this window beyond initial type sketches like Source/Type/Sequence/Action/StartEnd.rs (0b0d7fa, 2024-08-06).

[v0.1] - Rapid Development (Q3 2024)

The Cloudflare Workers + Cargo.toml scaffold landed across July and August 2024 as a long sequence of squash! commits and Dependabot rolls. No published API yet - we were still feeling out whether the scheduler should live as a Workers-adjacent crate or as a pure-Rust sidecar.

[v0.0] - Project Inception (July 2024)

First scaffold (c978097, 2024-07-02): Cloudflare Workers project template, GitHub Actions workflows, Dependabot config, the empty Cargo.toml shell. Echo existed as a placeholder for the work- stealing scheduler we knew Mountain would need - the real implementation arrived in v1.1.