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* test(#2893): add regression for append destroying prose below JSON ledger writeLedgerAtomic overwrites the entire file with renderLedger(ledger), dropping any prose below the JSON closing fence. The test creates a WINDOWS.md with prose sections below the ledger, appends an entry, and asserts the prose survives. * fix(#2893): preserve prose below the JSON ledger on append/waive/fixed writeLedgerAtomic was overwriting the entire WINDOWS.md with renderLedger(ledger), which reconstructs only the frontmatter + header + table + JSON block — silently destroying any prose a user wrote below the JSON closing fence. Now the writer reads the existing file before overwriting, extracts content after the closing fence, and appends it to the rendered ledger. First-write (no existing file) proceeds normally with no prose to preserve. * fix(#2893): address review — correct fence search + idempotency test BLOCKER from isolated adversarial review: indexOf(JSON_FENCE_CLOSE) matched the OPENING fence ('json' starts with ''), duplicating the entire JSON body as prose on every write. Now searches for the closing fence starting AFTER the opening fence, mirroring parseJsonBlock. Test hardened: non-empty initial ledger, second append (idempotency — prose appears exactly once, exactly one JSON fence open), parseLedger round-trip. * chore(#2893): add changeset fragment * chore(#2893): backfill changeset PR number 2975 --------- Co-authored-by: sim <sim@local>
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.