55604e9124
* fix(#1906): require node-test clean-fixture causation control The node-test fail-first proof accepted a deceptive content-independent negative test — one that reds merely because GSD_PROHIB_SUBJECT is set, ignoring the subject's content — whenever no cleanFixture was supplied, because #1346's causation control was opt-in. The proof's observed signal (RED) thus diverged from its target (RED caused by content) by default. Make the causation control mandatory for the node-test kind: a descriptor that omits cleanFixture is un-provable (fail-closed), never accepted under the weaker violation-only proof. When a clean fixture is present, fail-first is proven exactly as before (RED on violation AND non-vacuous GREEN on clean). The lint-rule kind is unchanged (its subject IS the linted file; no GSD_PROHIB_SUBJECT indirection). Breaking (Hyrum): a previously-green node-test prohibition with no clean fixture now hard-gates — blast radius is zero in-tree (no node-test prohibition ships today; only the lint-rule local/no-source-grep dogfood). Supersedes ADR-1606 Decision 4 / ADR-550 #1346 addendum's opt-in. Closes #1906 Claude-Session: https://claude.ai/code/session_017vYn26e3nkDNxcpty1ciPJ * docs(#1906): supersede the #1346 opt-in causation control (mandatory for node-test) Record the node-test mandatory-causation-control supersede across the governing surfaces: - ADR-1606 (the enforcement decision-of-record): addendum + Decision 4 annotated + the "Mandatory causation control — REJECTED" alternative flipped to accepted (premise no longer holds: zero in-tree node-test consumers). - ADR-550: the 2026-06-21 #1346 "Why opt-in, not required" paragraph marked SUPERSEDED, pointing at ADR-1606. - spec-phase.md: check_clean_fixture is now REQUIRED for node-test (was "optional"). - CONTEXT.md: PROHIB.enforce.causation predicate updated. Regenerated the shipped-artifact cascade from the spec-phase.md edit (+149 B, well under the 40960 cap): 16 golden-install-parity fixtures and the workflow size baseline. Refs #1906 Claude-Session: https://claude.ai/code/session_017vYn26e3nkDNxcpty1ciPJ
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, 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.