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* fix(#1779): emit valid YAML for unsafe scalars in reconstructFrontmatter reconstructFrontmatter wraps a scalar or block-array item in double quotes when it contains a YAML indicator (`:`/`#`, plus `[`/`{` for top-level scalars), but interpolated the raw value with no escaping. A value carrying both an indicator and a literal `"` (or `\`) serialized to invalid YAML, e.g. `upstream: "https://x (Tom; "Git. Ship. Done")"`, which fails under any strict parser (js-yaml, PyYAML) and corrupts the whole block on the next syncStateFrontmatter whole-block regen. - escapeDoubleQuoted() escapes `\`, `"`, and control chars (newline/tab/CR/C0 controls + DEL → YAML `\n`/`\t`/`\r`/`\xHH`) so any wrapped value is valid. - scalarNeedsDoubleQuoting() routes values that mis-parse or round-trip lossily when bare through that escaped form: the empty string (bare `k:` reloads as null), an embedded `"`/`\` or control char, a leading YAML indicator (quote / `&`*`!` anchor-alias-tag / `|`>` block scalar / flow `[]{},` / `#` / reserved `%`@`backtick / `-`?`:` before a space), or leading/trailing space. Applied at all four wrap sites. Scope stays on serialization correctness; it does NOT broaden the lossy object-list handling deferred to #1572/#1660. Known limitation: lone UTF-16 surrogates are still lossy through UTF-8 encoding (out of scope, extremely unlikely in frontmatter values). Regression test asserts strict js-yaml round-trip across all four wrap sites plus backslash, control-char (incl. NUL), empty-string, leading-indicator, and leading/trailing-whitespace classes; test-the-test confirms each fails on the unescaped output. Frontmatter suite 549/549 green, golden-install-parity 16/16 unchanged (no serialization churn). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> * chore(#1779): add changeset for frontmatter quote-escaping fix Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.8 (1M context) <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, 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.