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* enhance(#4155): invalidate verification results when covered inputs change readVerificationStatus() now recomputes a deterministic sha256 fingerprint over a VERIFICATION.md's declared covered_files (phase PLAN/SUMMARY, requirements, implementation files in the verified change set) and returns stale on any mismatch, fail-closed when a covered file is missing, unreadable, or escapes the project root. Legacy reports with no fingerprint metadata keep the prior SUMMARY-mtime staleness check unchanged. The verifier computes covered_digest via the new verification.fingerprint CLI command rather than by hand, since a digest is deterministic math, not an LLM-estimated value. * chore(#4155): backfill fork PR number in changeset * fix(#4155): trim gsd-verifier.md fingerprint instructions to fit LARGE tier byte cap * fix(#4155): address CodeRabbit findings on fingerprint fail-closed behavior Partial fingerprint metadata (one of covered_files/covered_digest present, the other missing or malformed) now fails closed to stale instead of silently downgrading to the legacy mtime-only check. computeCoveredDigest also canonicalizes with realpathSync before re-confining, so an in-root symlink whose target escapes the project root can no longer produce a matching digest. gsd-verifier.md restores the completeness requirement and checklist item trimmed by the earlier size-budget fix, within the LARGE tier byte cap. * chore(#4155): acknowledge gsd-verifier.md growth for the #4155 fingerprint instructions Emitted-Drift-Ack-Growth: gsd-verifier.md — adds the covered-input fingerprint instructions and frontmatter fields the #4155 verification staleness mechanism requires; trimmed to stay within the LARGE tier byte cap * fix(#4155): address gemini adversarial review findings computeCoveredDigest now threads the caller-supplied opts.fs seam through its confinement and read paths instead of always using raw node:fs — a caller like planning-inspect.cts's containmentEnforcingVerificationFs (GAP 2, #2790 follow-up) was silently bypassed for covered-input reads. The project-root anchor itself still canonicalizes through real fs (it is a trusted value the caller derived, not attacker-influenced covered-input data); only per-file candidate reads go through the injected seam. Covered-file paths are now canonicalized (./ prefixes, redundant slashes, internal .. segments) before becoming dedup/sort/hash keys or confinement subjects — closes both a spurious-stale false positive (two spellings of the same file hashing differently) and a confinement gap (an internal .. segment that doesn't start the string). gsd-verifier.md now states covered-file paths are project-root-relative, not phaseDir-relative, closing an ambiguity that would have made a real verifier agent's first fingerprint invocation fail closed. defaultFsImpl's methods now late-bind through fs.<method> rather than capturing function references at module load — the earlier direct-capture form was invisible to existing tests' t.mock.method(fs, 'statSync', ...) seams, a real regression caught by the full suite (not the reviewer). * fix(#4155): catch a plan/summary added to the phase dir after verification but never declared The content digest only recomputes hashes for paths the verifier actually declared in covered_files — it had no way to notice a plan or summary added to the phase directory after verification if that new file was never declared, silently regressing behind the legacy mtime check it replaces (which scans the live directory, not a declared list). findUncoveredCurrentArtifact re-scans the live phase directory for every current *-PLAN.md/*-SUMMARY.md and requires each to be represented in covered_files, closing that gap; a directory scan failure fails closed to stale rather than silently skipping the check. CONTEXT.md's Verification Module entry corrected to describe the fingerprint path's stricter fail-closed FS-error contract (routes to stale) instead of the module's original degrade-to-safe one (missing / not-stale), which only the legacy path still keeps. * refactor(#4155): extract canonicalizeCoveredFiles, add real nested-project e2e test computeCoveredDigest and cmdVerificationFingerprint each normalized/deduped/ sorted covered_files independently — one shared helper now backs both (gemini review's ponytail-lens finding). Adds one CLI-to-readVerificationStatus test against a genuine .planning/phases/NN-x/ project with an implementation file outside .planning/ entirely, closing the review finding that prior #4155 unit fixtures put phaseDir directly under an ownerless tmpdir (findProjectRoot falls back to phaseDir itself there) and never exercised real multi-level path resolution. * fix(#4155): route computeCoveredDigest through real fs, fail closed on unreadable plans/ Two independent review rounds (opus critical-reviewer + opus ponytail + agy, run twice) found two instances of the same fail-open class: - computeCoveredDigest's per-file reads routed through the caller's injected fsImpl. planning-inspect.cts passes a `.planning/`-confined containment fs into readVerificationStatus's opts.fs, so any covered implementation file outside `.planning/` (mandatory per the issue) made the confinement wrapper throw, which was caught and turned into a stale digest -- reporting every fingerprinted phase permanently stale via `planning.inspect`, regardless of actual drift. Per-file reads now always use real node:fs, matching the pre-existing treatment of root canonicalization; the realRel-vs-realRoot check is the real confinement boundary for this data and needs no seam. - allCurrentArtifactsCovered's try/catch never fired (scanPhasePlans reports readdir failures via a `scope` field, it never throws), so an unreadable nested plans/ dir was silently treated as "zero artifacts, all covered" instead of failing closed. Now branches on scope !== SCOPE.COMPLETE. Also, per ponytail's second-round findings: reverted an unwarranted FINGERPRINT_VERSION bump and digest length-prefix from the first fix (no v1 digest has ever existed -- the feature is unreleased -- and the prefix closed a collision that grants no capability beyond what a writer of covered_files already has more cheaply); removed a verifier-facing escape-hatch instruction whose own example was a case that should trigger staleness, not bypass it; corrected CONTEXT.md references to the renamed allCurrentArtifactsCovered and a stale "unconditional" rescan claim; simplified the isStale derivation, removed dead FsLike members, and tightened test coverage. Regression tests for both fail-open bugs are included and were each confirmed to fail against the pre-fix code before the fix landed. full test suite: 2558/2560 pass, 2 skipped, 0 fail * fix(#4155): trim gsd-verifier.md under the LARGE size cap Fork CI caught what my local runs missed: the superseded/nested-plans instruction added earlier pushed gsd-verifier.md to 49299 bytes, 147 over the LARGE tier's 49152-byte hard cap (tests/agent-size-budget.test.cjs). Tightened the #4155 instruction's wording and dropped a redundant inline comment tag; no content lost. * chore(#4155): point changeset at the upstream PR number pr: 19 was the fork PR opened for internal review-lane CI; now that open-gsd/gsd-core#4290 exists, the changeset field must match it per CONTRIBUTING.md's release-notes convention. --------- Co-authored-by: Test <test@test.com> Co-authored-by: Tom Boucher <trekkie@nomorestars.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.