f8b16d1874
* test(#1960): add failing-first RCA-branching contract + schema-invariant tests Epic #1957 Phase 2A. Source-text-is-the-product contract tests (fishbone >=2 categories, AND-gate, multi-cause root_cause, backward compat, reasoning checkpoint candidate_causes+and_gate fields, debugger-philosophy single-cause note, DEBUG template) plus behavioral schema-invariant checks on two fixtures: two contributing causes (AND-gate yes) -> both recorded; single-cause (AND-gate no) -> one root_cause, identical to today. Failing-first: reference, agent edits, and template note do not yet exist. * feat(#1960): add RCA branching (fishbone + AND-gate) to gsd-debugger Epic #1957 Phase 2A. Guards against 5-Whys single-cause bias: before committing root_cause, the debugger enumerates candidate causes across >=2 Ishikawa categories (code/config/environment/data) and explicitly answers an AND-gate question. When the AND-gate fires, every contributing cause is recorded, so a multi-cause fix no longer recurs via the unaddressed second cause. Resolution.root_cause may hold one OR a small set (additive; single-cause sessions are byte-identical to today). The Structured Reasoning Checkpoint gains candidate_causes + and_gate fields; debugger-philosophy.md adds the single-cause-bias trap. Full rules extracted to gsd-core/references/debugger-rca-branching.md (slim Phase 2 routing + 2 checkpoint fields kept in the agent). INVENTORY + manifest + agent-size baseline + install-parity goldens + AGENTS.md + DEBUG template updated. * fix(#1960): address orthogonal review (AND-gate self-consistency, parity guard, narrowed claim, ripples) - Reference: the collapse rule now enforces AND-gate self-consistency — and_gate=yes with a single confirmed cause is flagged as incomplete (return to Phase 3); a race/timing note clarifies such bugs bridge categories; the 'byte-identical' backward-compat claim narrowed to 'root_cause shape unchanged; reasoning_checkpoint gains 2 fields in every session'. - DEBUG.md: stale 'five-field' mirror prose -> seven-field (parallel-surface drift the reviewer flagged); new debug-session-management parity test pins the field-count claim to the gsd-debugger.md YAML keys (CRLF-safe). - Scalar-assuming consumers of set-valued root_cause updated: session-manager compact summaries (319/332), diagnose-only return (1062), archive entry (1216), ROOT CAUSE FOUND return (1322). - Test: added the AND-gate-yes/single-cause invariant + fixture; rephrased the fixture describe block honestly as a schema-invariant specification. - Phase 2 bullet phrasing clarified ('at hypothesis formation, before the Phase 4 commit'). * test(#1960): parity regex accepts word-form count ('seven-field' or '7-field') * test(#1960): parity regex counts array-valued YAML keys (no inline value) * chore(#1960): backfill changeset pr number (PR #2405)
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.