8fa2c3dbcf
Phase 0 of epic #4636. ADR-4650 fixes the decisions Phases 1-4 inherit, so that four phases do not each invent them independently. The load-bearing decision is that the engine and the exported shape are separable. A resolver-based, symlink-safe containment predicate already exists as validatePath, and building the epic's literal assertWithinRoot() from scratch would create a sixth implementation of the very thing this epic consolidates -- while risking silent loss of behavior validatePath acquired as bug fixes (a closed dangling-symlink existence oracle, ancestor canonicalization for non-canonical roots, a separator-aware boundary test). But the epic's other clause is correct and lands on the current export: validatePath returns a boolean a caller can forget to check, and populates `resolved` with the escaping path precisely on the traversal branch. While that form stays exported, the Phase-4 ratchet could only assert that a helper was called -- validatePath(x, root).resolved would pass the rule. So: preserve the engine, narrow the export. assertWithinRoot becomes the only export and yields a branded ContainedPath. Also recorded, each found by measurement rather than from the epic text: - The rejection message text is a real contract. tests/quick-batch.test.cjs asserts a user-facing `reason` field matches /escapes allowed directory/, so the string reaches CLI consumers and Phase 3 must preserve it verbatim. - Two further unconfined boundaries the epic does not enumerate: resolvePath and gap-analysis.plan-post, both in check-command-router.cts. - --phase-dir also interpolates into ${PHASE_DIR} for command-exit-zero, so confining at the boundary covers both predicate kinds; the evaluator stays fs-free. - opts.allowAbsolute is a per-call-site liberality knob, which is an acceptance policy living exactly where this ADR says it must not. - planning-inspect's isWithinRoot is deliberately pure-string with no I/O; its contract differs, so Phase 3 decides rather than assumes. The acceptance policy is stated once: conservative about the resource, exact about the classification. #4580's guard was not too strict, it was wrong -- a category error comparing a whole suffix against a set of final extensions. ADR opens as Proposed; ratified at Phase 4 closeout per docs/adr/README.md. No changeset: the diff touches docs/adr/ only, which is outside USER_FACING_PREFIXES in scripts/changeset/lint.cjs. Co-authored-by: sim <sim@local> Co-authored-by: Claude Opus 5 <noreply@anthropic.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.