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* fix(#663): resolve open CodeQL/Dependabot security alerts - ReDoS: collapse ambiguous nested quantifiers in phase-heading regexes (verify/validate/commands) and the plan-filename lookahead (phase) to provably-equivalent non-backtracking forms - prototype pollution: guard __proto__/constructor/prototype in setConfigValue - remove dead no-op .replace(/-/g,'-') in phase.cts - escape all regex metachars in bug-2839 test - add contents:read permissions to security-scan + install-smoke workflows - pin qs >= 6.15.2 via overrides (DoS GHSA) - broaden prompt-injection allowlist to translated security-model docs Closes #663 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * test(#663): regression tests for prototype-pollution guard and roadmap-phase ReDoS Behavioral test that config-set rejects __proto__/constructor/prototype keys without polluting Object.prototype, plus a ReDoS guard (timing-bound) and behavior-preservation assertions for the collapsed phase-heading regexes. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * test(#663): make ReDoS regression assert structured result, not elapsed time Replace elapsed-time assertions (which tripped local/no-elapsed-assertion ESLint rule and were unsound for synchronous ReDoS) with structured-result assertions on adversarial inputs: assert that malformed phase headings/ unchecked-item lines without a terminating colon/space yield an empty Set, which is both the correct behavior and an exercise of the fixed linear regex on the catastrophic-backtracking input shape. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * chore(#663): add Security changeset fragment for #665 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * test(#663): fold prototype-pollution regression into config.test.cjs The standalone bug-663-config-prototype-pollution.test.cjs was a 9th config-module test file, tripping lint-test-file-count (the allowlist is ratcheted and must not grow). Consolidated into config.test.cjs instead. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.8 <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, Gemini 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, 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, 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.