374300da17
Phase 2 of epic #4636, absorbing #4327 and #4354. Implements ADR-4650 decision 3: containment is a boundary concern — the predicate runs where external input enters, not at whichever interior call site remembered. Four boundaries now validate against their managed root and reject with a USAGE-shaped error before touching the filesystem: todo complete <name> -> todosDir(cwd) check predicate --phase-dir <dir> -> projectDir check decision-coverage-plan <dir> -> projectDir (via resolvePath) check gap-analysis.plan-post <dir> -> projectDir #4327 understated its own severity. It reports that a traversal name "resolves outside the todos root", which reads as an information leak. Measured, it was destructive: the command exited 0, MOVED the outside file into completed/, and unlinked the original. cmdTodoComplete ends in fs.unlinkSync(sourcePath), so an unconfined name consumed across the boundary rather than merely reading across it. Validation now precedes every fs call — existsSync, readFileSync, ensureDir, writeSync, unlinkSync — and both halves of the move are confined, so neither source nor destination can land outside the root. --dry-run is rejected on the same terms; a preview must not leak a resolved outside path either. #4354 reproduces exactly: a BLOCKING gate returned block:false sourced entirely from a SECURITY.md in a caller-chosen directory outside the project. THE HARDER HALF, found by the isolated adversarial review of the first attempt: validating a path and then using a DIFFERENT one closes nothing. The first fix validated `--phase-dir` joined against `--cwd`, then passed the RAW unjoined value into the predicate context. gate-predicate-evaluator uses it as-is and findPhaseArtifact resolves a relative path against the REAL process cwd — so validation and the read used two different roots whenever process.cwd() differed from --cwd. Reproduced: running from a directory holding a plan with `secret_field: LEAKED_VALUE`, a predicate declared against an empty --cwd project exited 0 and returned "actual":"LEAKED_VALUE". The rule now applied at all three router sites: **use the validated resolved path, never the raw input.** Independently re-verified after the fix — the lookup resolves in the --cwd project and no value leaks. gate-predicate-evaluator.cts is untouched and still imports no fs. Confining in the router is what keeps that pure-leaf contract intact AND covers ${PHASE_DIR} interpolation into command-exit-zero, which an evaluator-local fix would have missed entirely. Also fixed, same review: `todo complete .` and `..` passed containment (they resolve to the pending dir, which IS inside the root) and then threw an uncaught EISDIR with an absolute-path stack trace. Now a clean USAGE rejection naming the real reason — "todo name is not a file" — rather than borrowing the escape message, which would have stated something false. Ripples discharged BEFORE the verification checkpoint rather than after, per the Phase 1 retrospective: docs/reference/gate-predicates.md and docs/CLI-TOOLS.md document the new constraints, CONTEXT.md records why containment lives at the router rather than the evaluator, the changeset is written, and the install-tree goldens were regenerated to confirm unchanged (no new shipped file) rather than assumed. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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.