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* fix(#2452): stop shallow-fetching the base ref in three-dot-diff CI gates `mutation.yml` re-fetched the base branch with `--depth=1` after checking out with `fetch-depth: 0`. The shallow re-fetch truncates the base ref's ancestry, so `git diff --name-only origin/<base>...HEAD` in scripts/mutation-matrix.cjs can no longer compute a merge base and aborts with `fatal: origin/next...HEAD: no merge base` (exit 2). The `detect` job then fails and the `mutate` shards never run — so the 80% mutation-score threshold went UNVERIFIED rather than enforced. The failure is branch-position dependent, which is why it went unnoticed: a branch already level with the base incidentally passes (its merge base IS the single fetched commit), while a branch that is BEHIND fails. Observed on PRs #2436 and #2005. `changeset-required.yml` and `docs-required.yml` shallow-fetched the base ref too (`--depth=50`), shrinking the same window further. All three now fetch the BASE REF unshallowed. Their shallow *checkout* depth is left at 50: that is a separate, deliberate cost control with fail-closed semantics, owned by tests/policy-lint-shallow-checkout.test.cjs. Only the base-ref fetch changes. The two `${{ }}` interpolations in mutation.yml's run: blocks now pass the base name through `env:`, matching the sibling workflows. Regression coverage in tests/mutation-workflow-base-ref.test.cjs: - a per-workflow contract guard asserting the base fetch carries no --depth (RED on origin/next for all three files, GREEN here). The YAML step parser handles block scalars and skips commented-out steps, so a future refactor to a multi-line `run:` cannot silently degrade the guard. - a real-git mechanism proof with boundary coverage at the shallow edge: with the base advanced 60 commits past the branch point, --depth=1 and --depth=60 both fail with `no merge base`, --depth=61 (merge base exactly at the boundary) succeeds, and an unbounded fetch succeeds. Each variant uses an independent clone, because a plain fetch does not un-shallow a repo that already carries a .git/shallow boundary. Also fixes a startup race in tests/run-with-timeout.test.cjs surfaced by this branch's gsd-test run (C1, linux-node24). The heartbeat file only appeared ~100ms after the grandchild's runtime was up, but the window is 1s spanning two cold node starts, so on a loaded runner the timeout fired before any heartbeat existed and the precondition failed for reasons unrelated to reaping. The child now writes its heartbeat once synchronously at startup; the frozen-vs-ticking comparison that actually proves reaping is unchanged. Closes #2452 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * docs(changeset): backfill PR number to 2485 --------- Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
GSD Core
Git. Ship. Done.
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A light-weight meta-prompting, context engineering, and spec-driven development system for Claude Code, OpenCode, Antigravity CLI, Kimi CLI, Kilo, Codex, Copilot, Cursor, Windsurf, and more.
What is GSD Core
GSD Core is a context-engineering and spec-driven development framework that drives AI coding agents (Claude Code, Codex, Antigravity CLI, Kimi CLI, Copilot, Cursor, and more) through a disciplined phase loop. It solves context rot — the quality degradation that accumulates as an AI fills its context window — by running all heavy research, planning, and execution work in fresh-context subagents while keeping your main session lean.
How it works
Each milestone repeats the same five-step loop, one phase at a time:
- Discuss — capture implementation decisions before anything is planned
- Plan — research, decompose, and verify the plan fits a fresh context window
- Execute — run plans in parallel waves; each executor starts with a clean 200k-token context
- Verify — walk through what was built; diagnose and fix before declaring done
- Ship — create the PR, archive the phase, repeat for the next one
Quickstart
npx @opengsd/gsd-core@latest
The installer prompts for your runtime (Claude Code, OpenCode, Antigravity CLI, Kimi CLI, Kilo, Codex, Copilot, Cursor, Windsurf, and more) and whether to install globally or locally. The installer is required for cross-runtime compatibility — do not copy files from agents/ or commands/ directly.
On another runtime or without Node.js? See Install on your runtime.
Once installed, start a new project or onboard an existing repo:
/gsd-new-project # greenfield project
/gsd-onboard # existing codebase
New here? Follow Your first project for a guided walkthrough from install to first shipped phase, or Onboarding an existing codebase for brownfield setup.
Documentation
What's new in 1.7.0 → docs/whats-new-1.7.0.md
Tutorials — learning by doing:
How-to guides — task-focused recipes:
Reference — authoritative facts:
Explanation — concepts and design decisions:
Full index: docs/README.md. Other languages: 日本語 · 한국어 · Português · 简体中文.
Why it works
Most AI-coding setups fail at scale because context bloat silently degrades output quality, there is no shared memory between sessions, and nothing verifies that code actually works. GSD Core solves all three: heavy work runs in fresh subagents, structured artifacts like STATE.md and CONTEXT.md survive session boundaries, and the verify step walks through what was built and generates fix plans before a phase is declared done. See docs/explanation/context-engineering.md for the full reasoning.
Troubleshooting? See docs/how-to/recover-and-troubleshoot.md.
Community
| Project | Platform |
|---|---|
| gsd-opencode | Original OpenCode port |
| Discord | Community support |
Star History
License
MIT License. See LICENSE for details.
Claude Code is powerful. GSD Core makes it reliable.