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* test(#4660): pin the letter-axis parity defect across all 6 shell/markdown phase-id sites Extends tests/nsegment-phase-grammar.test.cjs (#4568) one axis over: for each of the six sites, reads the live regex off disk and asserts it agrees with src/phase-id.cts's PHASE_NUMBER_TOKEN_SOURCE on the letter axis in BOTH directions — accepts `12A` / `3A` / `03A` / `23A.1.2`, still rejects `3a`, `3AB`, `A3` and the other canonical-invalid shapes — and that the two extracting sites return the full letter-suffixed token rather than its digit prefix (or nothing). Negative control against the unfixed tree: 22 failures, exactly the "(fails before the fix)" cases; every reject-parity case already green. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01NLtEbRc1Qfbe95HRMNqwp3 * fix(#4660): widen the 6 shell/markdown phase-id mirrors to the canonical grammar's letter axis Adds `[A-Z]?` after the leading digit run at all six sites #4568 widened — the ERE translation of src/phase-id.cts's `\d+[A-Z]?(?:\.\d+)*` — so a documented, canonical-valid id like `12A` or `23A.1.2` is no longer refused by the four validating sites (code-review.md, code-review-fix.md, gsd-code-fixer.md, gsd-code-fixer.compact.md) or truncated to its digit prefix by the two extracting sites (execute-plan.md's plan-filename grep, plan-phase.md's --research-phase capture). Behaviour is byte-identical for every id that matched before; the adjacent comment and error-message text now names the grammar it mirrors. Driven: `init code-review 3A` on a fixture with a `03A-slug/` directory and a `### Phase 3A:` heading emits `padded_phase: "03A"`, which the old regex rejects and the widened one accepts — nothing upstream of the validator mangles the id. At execute-plan.md the trailing `-[0-9]+` is the PLAN number and stays digit-only; plan and milestone dimensions are out of scope per the brief. `CASE_FLEXIBLE_PHASE_NUMBER_TOKEN_SOURCE` derives from the canonical source by a literal `.replaceAll('A-Z', 'A-Za-z')`, so src/phase-id.cts is deliberately untouched. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01NLtEbRc1Qfbe95HRMNqwp3 * chore(#4634): extend lint-phase-id-drift to ban a letter-less phase-id mirror in workflows/ and agents/ Adds findLetterlessPhaseMirrorDrift — the letter-axis twin of the #4568 single-segment rule — flagging the unbounded-segment shape `[0-9]+(\.[0-9]+)*` (and its \d / doubled-backslash near-variants) whose digit run is NOT followed by the `[A-Z]?` class, on any phase-carrying line across gsd-core/workflows/**/*.md, gsd-core/references/**/*.md and agents/**/*.md. Sanctioned the same way (`<!-- phase-id-owner: ... -->`), tolerates the case-flexible `[A-Za-z]?` directory-scanning variant so it cannot force that separate axis to narrow, and is wired into scanAll. Confirmed zero violations against the real tree post-#4660 fix, and one violation when a single site is reverted. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01NLtEbRc1Qfbe95HRMNqwp3 * docs(#4660): add Fixed changeset Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01NLtEbRc1Qfbe95HRMNqwp3 * chore: regenerate conformance-tier manifests for the extended grammar test tests/nsegment-phase-grammar.test.cjs now requires the compiled gsd-core/bin/lib/phase-id.cjs (to assert the canonical grammar agrees with each site's live regex), which moves it to a different platform-conformance tier; `gen-platform-conformance-tier.cjs --check` in lint:ci flagged the macOS manifest as stale. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01NLtEbRc1Qfbe95HRMNqwp3 * test(#4660): reword a comment that tripped lint-docs-guard-registration The comment mentioned `docs/CONFIGURATION.md` between two backticked tokens, which the lint's template-literal detector read as a docs/ path expression. The test reads no docs/ file. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01NLtEbRc1Qfbe95HRMNqwp3 * chore(#4660): refresh the compact-content benchmark baseline and acknowledge emitted growth plan-phase.md grew by 4 bytes (`[A-Z]?`), which moves the committed compact-content benchmark; refreshed with `benchmark-compact-content.cjs --write`. The six shipped files below grew by the widened regex literal plus the comment and error-message text that now names the canonical grammar. Emitted-Drift-Ack-Growth: code-review.md — #4660: `[A-Z]?` at the PADDED_PHASE validator plus a comment/error message naming the canonical grammar and the `12A` example Emitted-Drift-Ack-Growth: code-review-fix.md — #4660: `[A-Z]?` at the PADDED_PHASE validator plus a comment/error message naming the canonical grammar and the `12A` example Emitted-Drift-Ack-Growth: gsd-code-fixer.md — #4660: `[A-Z]?` at the padded_phase sink validator plus the defense-in-depth comment and error message updated to the canonical grammar Emitted-Drift-Ack-Growth: gsd-code-fixer.compact.md — #4660: `[A-Z]?` at the padded_phase sink validator plus the comment and error message updated to the canonical grammar Emitted-Drift-Ack-Growth: execute-plan.md — #4660: `[A-Z]?` in the plan-filename phase extraction (6 bytes) Emitted-Drift-Ack-Growth: plan-phase.md — #4660: `[A-Z]?` in the --research-phase capture (6 bytes) Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01NLtEbRc1Qfbe95HRMNqwp3 * chore(#4660): set changeset fragment pr to 4744 * chore: re-trigger Validate Branch Name The required check-branch context was cancelled on this head by the workflow's cancel-in-progress group when the changeset pr-field backfill push landed three seconds after the PR opened; no completed run exists for the current head, and a fork contributor cannot re-run it. Empty commit to re-run it. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01NLtEbRc1Qfbe95HRMNqwp3 --------- Co-authored-by: CI Rebase Check <ci@gsd-redux> Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com> Co-authored-by: Tom Boucher <trekkie@nomorestars.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.