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* fix(frontmatter): quote decimal-shaped scalars so a spec YAML reader preserves them A decimal phase identifier written to STATE.md frontmatter (e.g. `current_phase: 22.10`) was emitted BARE, because `scalarNeedsDoubleQuoting` only asks whether a value can OPEN a plain scalar — which `22.10` can. A YAML-spec reader (js-yaml, the statusline, any external tool) then reloads bare `22.10` as the float 22.1, colliding with `22.1` and dropping the trailing zero. gsd's own tolerant line-scanner (`extractFrontmatter`) round-trips the raw text and so hid the defect; a spec reader does not. Fix: `reconstructFrontmatter`'s general scalar path now also quotes numeric- looking strings that are not plain all-digit integers (decimals, exponents, sexagesimal, hex/oct/bin) via `generalScalarNeedsNumericQuoting`, reusing the existing `YAML_NUMERIC_RE`. Every all-digit string — integer counts, phase numbers, and leading-zero fixtures like `02` — stays bare, so the state-rebuild idempotency baseline and the rest of the state corpus are unchanged. This also quotes `gsd_state_version: 1.0` on write, which matches the authoritative STATE.md template (`src/state.cts` already emits it quoted). Regression test drives the real write path and asserts, via js-yaml, that `22.1` and `22.10` no longer collide and read back string-typed; guards that integers and free-text stay unquoted. Fixes #4053 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01YBicDMJyh3AH56ZFbUsyxC * chore(changeset): add Fixed fragment for #4053 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01YBicDMJyh3AH56ZFbUsyxC * docs(frontmatter): trim the generalScalarNeedsNumericQuoting comment Cut the over-long doc block down to the essential why and drop the inline comment that repeated it. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_011ZKeSj55VakqQajtoBgCTC * docs(test): drop the #4053 explanatory comments from the touched tests The assertions speak for themselves; remove the added narrative comments. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_011ZKeSj55VakqQajtoBgCTC * fix(#4053): correct the trade-off comment, changeset PR number, and cover every claimed numeric form Review follow-ups (trek-e): - The doc comment claimed a plain integer round-trips harmlessly. That is false for leading-zero values (`02` -> 2, `017` -> 17 under js-yaml). Rewrite it to state the real, deliberate trade-off: all-digit strings stay bare because zero-padded ids (`plan: 01`, `phase: 02`) are the pervasive GSD convention and quoting them all is the blanket quoting #4053 asked to avoid; the loss is padding not identity (`02` and `2` normalize to the same phase, `22.1` and `22.10` do not). - Changeset carried the auto-closed draft's number (4151); correct to 4165. - Test exponent, hex, octal, binary and sexagesimal forms through js-yaml, and pin the leading-zero trade-off so the documented behaviour is asserted. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Qc7VN4zTpTSDTS9JXM2cFB --------- Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com> Co-authored-by: Tom Boucher <trekkie@nomorestars.com>
GSD Core
Git. Ship. Done.
English · Português · 简体中文 · 日本語 · 한국어
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.