fc019b2688
trek-e's review found the M1 PID-liveness backport dropped two pieces of capability-lock.cts's steal-safety machinery, reopening the #500/#905/#1230 lost-update family: - Empty-body window (state.cts): acquireStateLock creates the lock with O_EXCL and writes the pid in a separate writeSync; a lock observed in that gap has an empty body, reads as not-verified-live, and was stolen at age ~0 — robbing a holder mid-creation. Add a fresh-create floor scoped to the unverifiable-body case: an empty/unparseable body that is fresh is treated as mid-creation and is NOT stolen, while a COMPLETE dead-pid body is still stolen promptly (preserves the prompt-dead-steal contract). planning-workspace writes its body atomically (flag:'wx') so it has no empty-body window. - Double-steal (both locks): the steal was a bare fs.unlinkSync with no identity re-confirm, so two waiters could both reclaim a dead holder and end up holding concurrently. Replace with an atomic renameSync (only one racer wins the inode) guarded by a (dev,ino,body) identity re-confirm immediately before the steal; body content is part of the identity to defeat inode reuse. Tests (seam-driven, no wall-clock, each proven RED-before-GREEN): - clock-seam: fresh empty-body lock is not stolen at age ~0; a racer-recreated live lock is not double-stolen (identity re-confirm). Adds a beforeSteal seam. - planning-workspace: racer-recreated live lock is not double-stolen. - Updated the two #1217 unlinkSync-failure tests to the renameSync steal path (the bounded-backoff/no-busy-spin guarantee is preserved and re-asserted). Uncontended acquire path is byte-for-byte unchanged. Claude-Session: https://claude.ai/code/session_01R88n7Q54bAaVHFkDbbH1yz
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, Gemini 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, Gemini 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, Gemini 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 your first project:
/gsd-new-project
New here? Follow Your first project for a guided walkthrough from install to first shipped phase.
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.