09be501eb7
Phase 4 of epic #2121 (ADR-2121 Decision 7), closing the recurrence loop that produced #2111 / #2114 / #2104: no module outside src/phase-id.cts may re-implement phase-ID parsing without failing CI. - phase-id.cts: add PHASE_NUMBER_TOKEN_SOURCE — the canonical phase-number-token grammar (\d+[A-Z]?(?:\.\d+)*) for enumeration/scan call sites, the ANY-phase counterpart to phaseMarkdownRegexSource(n)'s known-number lookup. Extend-only (never touches normalizePhaseName; blast radius 79 fns / CRITICAL). - scripts/lint-phase-id-drift.cjs: pure findPhaseIdRegexDrift(text) + scanRepo(root), wired to `npm run check:phase-id-drift`. Flags a literal re-derivation of the canonical token (both /\d/ and new-RegExp `\\d` escaping, plus the [A-Za-z] and [.-] near-variants) anywhere in src/** outside phase-id.cts, unless sanctioned with `// phase-id-owner: <reason>`. Narrow by design: bare \d+, digits-only captures, \w ids, status-message text and pipe-tables are not flagged. - tests/phase-id-drift-guard.test.cjs: fail-first drift cases (AC1) + live scanRepo(ROOT) zero-drift (AC3) + identity guard — phase-id.cjs exports the complete locked surface and no consumer re-exports a divergent copy (AC2). 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
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.