bf9fe4630d
* feat(#2249): bracket phase-id core grammar — parse/render/toDir + READING-B + guards PR-1 of epic #612 (ADR-612, in-tree at docs/adr/612-bracket-phase-id-convention.md). Adds the bracket-convention grammar INSIDE src/phase-id.cts — the ADR-2121 single canonical owner — as a pure, additive extension. The 17 locked exports and PHASE_NUMBER_TOKEN_SOURCE are untouched, and normalizePhaseName is byte-identical, so the PR-0 collision anchor (tests/adr-612-collision-characterization.test.cjs) stays green. New pure round-trippable model (ADR Decision 4): - PhaseId { project, milestone, phase, subphase?, plan? }. - parsePhaseId(input): accepts display `[GSD.02] 05.03-01`, dir/token `GSD.02-05.03-slug`, or bare `GSD.02-05`; rejects ambiguous non-bracket tokens (`02-04`, `05`) rather than guessing. The rejection lives ONLY in this new parser — normalizePhaseName and every legacy reader keep accepting those tokens unchanged (conservative default; no existing path gains a throw). - renderPhaseId(id) -> `[GSD.02] 05.03-01`; toDir(id, slug) -> `GSD.02-05.03-slug` with a slug guard that sanitizes path-traversal input. - getMilestoneFromPhaseId(phaseId, convention?): READING-B derives the milestone from the `[PROJECT.MM]` prefix, gated on convention === 'bracket' and returning the `vN.0` form (parity with READING-A). The optional parameter keeps the helper pure (no config read) and byte-compatible — every existing single-arg caller resolves to the unchanged READING-A body (ADR Decision 6). - extractPhaseToken(dirName, convention?): bracket dir branch GATED on convention === 'bracket'. A bracket dir `{CODE}.{MM}-{PP}` is string-indistinguishable from the legacy #2043/#1324 letter-prefixed-decimal family (`P0.3-2`, `P0.12-34`) whenever the code ends in a digit, so no string-only discriminator is complete — an ungated auto-detect silently reinterpreted legacy reads on this CRITICAL 6-caller helper. The explicit convention signal keeps every existing convention-less call site byte-identical (pinned by a #2043 numeric-tail characterization in tests/phase-id.test.cjs). - comparator: no new code — comparePhaseNum already orders the dot-decimal `PP[.SS]` tokens extractPhaseToken yields; milestone-qualified ordering is a PR-2 resolution concern (bracketQualifiedKey), not core grammar. - SENTINEL_RANGES / isSentinelPhaseId(phaseId, convention?): {0, 999} non-milestone guard; the bracket-prefix reading is gated the same way (an ungated read called `P0.0-foundation` a sentinel), legacy leading-int form unchanged. - BRACKET_PHASE_TOKEN_SOURCE (dot-or-dash `[.-]` sub-separator; deliberately more permissive than parsePhaseId — a read-tolerance source for PR-2, not the emit grammar) and PHASE_HEADING_PREFIX_SRC exported from the drift-guard-exempt owner so PR-2 builds every bracket read regex from the canonical source and check:phase-id-drift stays green stack-wide. The bracket project code follows the repo's config-validated `[A-Z][A-Z0-9_]*` grammar (not the ADR §1 illustration's `[A-Z]{1,6}`), so every project_code the config permits parses. parsePhaseId has no live callers in PR-1, so this grammar choice is forward-facing for PR-2 with zero PR-1 behavior impact. Tests: tests/adr-612-bracket-grammar.test.cjs (28) — ADR §3 example round-trips, full 5-tuple parse, READING-B (+ legacy-unchanged and sentinel cases), extractPhaseToken bracket ON/OFF, comparator ordering of extracted tokens, sentinel + slug guards, bare-token rejection, exported-source behavioral assertions, and two generative fast-check properties: render∘parse identity over well-formed displays, and the toDir/disk↔display bijection. Plus a #2043 numeric-tail characterization (single- AND multi-digit rows) in tests/phase-id.test.cjs pinning the convention-less reading byte-identical. The compiled gsd-core/bin/lib/phase-id.cjs is gitignored (ADR-457 build-at-publish) and rebuilt by CI, so it is intentionally not committed. Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * chore(#2249): changeset fragment for PR #2258 (docs-exempt: internal grammar behind flag) Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * fix(#2249): reject non-canonical phase-id input + harden toDir (review B1/M1-M3) PR-1 CHANGES_REQUESTED follow-up (epic #612, ADR-612 Decision 4). B1 (blocker): parsePhaseId accepted non-canonical input (unpadded numbers, over-padded numbers, multi-space separators, stray whitespace), so render(parse(x)) === x did not hold for every well-formed x as ADR-612 Decision 4 requires. Both branches now enforce canonicality by construction: parse permissively, rebuild the canonical string via the same emit path (renderPhaseId for display, a hand-rebuilt token for dir/token), and throw "parsePhaseId: not canonical" on any mismatch. The .trim() at the parser's entry is removed — the match anchors now reject leading/trailing whitespace outright, folding into the existing "not a bracket phase id" rejection. M1 (major): toDir only ever guarded the slug; project/milestone/phase/ subphase were interpolated unsanitized, so a hand-built PhaseId (a structural, not nominal, type) could smuggle a path-traversal segment onto disk. Every field is now validated against the exact shape parsePhaseId itself would produce before use. M2 (major): a slug that sanitized to empty (e.g. '!!!') left a dangling trailing hyphen in the emitted dir name. toDir now throws in that case. M3 (major): an all-digit slug (e.g. '2026') was string-indistinguishable from the dir-branch's plan tail, so it silently broke the disk<->identity bijection on read-back. toDir now rejects all-digit slugs. Nits: toDir now rejects a non-string slug instead of coercing it to the literal token 'undefined'/'null'; sentinel boundary tests added for milestones 1/998/1000 (SENTINEL_RANGES is the two discrete values {0, 999}, not an inclusive range — these were already correct, now locked by test). Test-first: every new assertion (concrete examples + fast-check mutation property for B1; concrete cases for M1-M3 and the nits) was written and confirmed red before the implementation changes, per repo TDD convention. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * chore(#2249): reformat changeset body to house convention (review Mi2) The fragment added in ab26190a was a plain paragraph — no bold headline, no trailing issue reference. Reformat to the repo's `**Bold headline** — symptom/explanation. (#issue)` body shape (see e.g. .changeset/agile-pandas-dance.md, .changeset/fierce-pumas-gather.md). Uses (#2249), the issue every commit on this branch references, not the PR number already carried in frontmatter (`pr: 2258`) — the changelog serializer appends `(#{pr})` unconditionally, so a body also ending in `(#2258)` would double-render as `(#2258) (#2258)`. Verified the rendered bullet directly via parseFragment + serializeChangelog: it now reads `... (#2249) (#2258)`, matching the dominant convention across the other fragments (frontmatter pr = merged PR, body reference = originating issue). Also moved the docs-exempt marker back before the paragraph -> after it (matching the file's original order): the marker sits on its own line and is stripped before the body is used, but placing it first left a leading blank line in front of the bold headline once reformatted. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * test(#2249): widen property generators — 3+-digit numerics + subphase-pad mutation (re-review Minor 1/2) PR-1 re-review follow-up (epic #612, ADR-612 Decision 4). Test-only: closes two property-generator coverage gaps the reviewer flagged; no source change (src/phase-id.cts and gsd-core/bin/lib/phase-id.cjs are byte-unchanged). Minor 1 (3+-digit numerics never exercised): numArb capped at 99, so no property fed a 3+-digit milestone/phase/subphase/plan through parse/render/ toDir despite CANONICAL_NUMERIC_RE's dedicated `[1-9]\d{2,}` branch. Widen numArb to 1–999 so the round-trip and disk↔display bijection properties both span 3-digit widths (pad2 passes ≥3-digit values through un-truncated with no leading zero, so canonicality still holds). Add a concrete regression pinning the reviewer's hand-traced example: '[GSD.100] 05' round-trips, renders, and toDirs to 'GSD.100-05-feature' without truncation. Minor 2 (no subphase-pad mutation): the B1 mutation-rejection property covered milestone/phase pad + whitespace mutations but never a subphase pad. Add unpad-subphase / overpad-subphase to the mutation set and a generated `includeSub` boolean that decides whether the canonical carries a `.SS` (forced in for the subphase mutations so there is always a `.SS` to mutate); non-subphase mutations keep their original no-subphase coverage. Non-vacuity verified against the compiled lib by temporarily probing each widened/new property and confirming it fails: round-trip counterexample ["A",100,1,…] and bijection counterexample ["A",1,100,…,"a"] prove 3-digit tokens are genuinely generated and reach the body; a no-op unpad-subphase mutation trips the mutated===canonical guard (counterexample ["A",1,1,1,false,"unpad-subphase"]), proving the subphase branch is reached with a subphase present. Probes reverted; numRuns unchanged. Gates: tests/adr-612-bracket-grammar.test.cjs 44 pass / 0 fail; `npm run test:unit` 1079 pass / 0 fail; `npm run lint:ci` exit 0. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * fix(#2249): consume the #2232 continuation seam at the bracket token's slug-adjacent position (review Major) BRACKET_PHASE_TOKEN_SOURCE was a sixth continuation-recognition site that re-derived the grammar as an unbounded `\d+` literal instead of consuming PHASE_CONTINUATION_SEGMENT_SOURCE, re-opening the #2232 bug class on the bracket path: a PR-2 reader interpolating it over dir `PROJ.01-14-2026-photos-…` (a slug whose first word is a year) over-collected the token as `01-14-2026` instead of `01-14`. Interpolating the cap verbatim at every position was rejected on evidence: the bracket run is `MM-PP[.SS][-LL]` and only the LAST position is slug-adjacent. The exactly-2 cap at the others would under-collect ids toDir itself emits — `PROJ.02-105-slug` (3-digit phase) reads as `02`, `[GSD.02] 05.100` (3-digit sub-phase) as `05` — because CANONICAL_NUMERIC_RE admits `[1-9]\d{2,}` and `[GSD.100] 05` is a pinned regression. Those positions are delimiter- disambiguated (a required field separator; a dot a slug can never contain), not heuristically recognized, so they have no year collision to defend against. Upstream draws the same line for the same reason: core-utils/phase cap the paired PLAN component while the leading phase component stays unbounded. So the run is now positional rather than a free `(?:[.-]\d+)*` repetition, and each position takes the width its delimiter affords: leading unbounded, dash-1 and dot canonical, and the slug-adjacent dash-2 interpolating the single-owner seam. The accepted trade-off is #2232's policy verbatim: a PLAN ≥100 is out of the token grammar. Also derives CANONICAL_NUMERIC_RE from the new BRACKET_CANONICAL_NUMERIC_SOURCE instead of re-spelling it as a literal, so the emit-side gate and the read-side token source are one rule — the same single-owner discipline this fix is about. Behaviour-identical (the anchors make the source's `(?!\d)` guard redundant). Refs #2249 * test(#2249): pin the bracket/#2232 reconciliation — parity surface 6 + divergence gate + property (review Major) The comment block alone cannot hold the divergence: src/phase-id.cts is exempt from the #2128 drift guard by construction, so lint-phase-id-drift.cjs would not catch the bracket token source drifting from the seam. Per the Generative Fix Divergence rule, the divergence is pinned behaviorally instead. Surface 6 joins the existing #2232 parity gate rather than starting a rival one: the review named the bracket token source "a sixth continuation-recognition site", and continuation-grammar-parity.test.cjs is already the invariant-named home where the five #2043 sites agree with the owner on a shared width corpus. Surface 6 asserts the same contract at the bracket run's slug-adjacent position (`01-14-<seg>-photos-…`, mirroring surface 1 with the extra milestone level), so the bracket path now fails the same gate the other five do. A second block pins the DELIBERATE half — the wider canonical width at the delimiter-disambiguated positions, plus the accepted bound (a plan >=100 is out of the grammar). Without it, "unifying" bracket onto the exactly-2 cap would look like a cleanup rather than a regression. The generative property ties the READ side to the EMIT side metamorphically: for every id toDir can produce, BRACKET_PHASE_TOKEN_SOURCE must collect exactly that id's numeric run — no more, no less. It needed a new arbitrary: the existing slugArb generates one [a-z0-9] word and so can never produce the number-leading slug the collision requires. Probe-falsified, both directions (probes reverted): - reverting the source to the old unbounded `\d+` fails 8: the parity gate reports `"01-14-2026-photos-performance" collected "01-14-2026"` — the review's scenario verbatim — and the property shrinks to ["A",1,1,undefined,"100-a"]. - interpolating the seam at EVERY position (the rejected verbatim option) leaves the repro and parity green but fails the divergence gate `'02' !== '02-105'` and the property at ["A",1,1,100,"100-a"] (3-digit sub-phase), which is the evidence that a verbatim cap under-collects ids toDir emits. Width 2 stays green under both probes — the corpus agrees with the owner exactly where the old and new rules coincide, so the gate discriminates rather than merely mirroring the regex. Refs #2249 * docs(#2249): add the new phase-id exports to the CONTEXT.md glossary bullet (round-4 Major) * test(#2249): pin deterministic grammar boundary cases (re-review m1) PR-1 re-review follow-up (epic #612, ADR-612 Decision 4). Test-only: closes the m1 proof gap — the grammar's bounds were exercised only incidentally through the fast-check domain (1-999, [a-z0-9] slugs). No source change (src/phase-id.cts and gsd-core/bin/lib/phase-id.cjs byte-unchanged). Adds a deterministic boundary block (7 describe groups, +22 tests) pinning the compiled lib's CURRENT behavior — a proof gap, not a behavior gap: - m1.1 numeric-width 99/100/101 at milestone/phase/subphase/plan: parse (display + dir) -> render/toDir round-trip byte-equality. The plan position is identity-symmetric (parse/render accept 99/100/101) but toDir drops it (filename-surface dimension only). - m1.2 read-token width is POSITIONAL: BRACKET_PHASE_TOKEN_SOURCE absorbs 99/100/101 at milestone/phase/subphase (delimiter-disambiguated) but caps the slug-adjacent plan (dash-2) at exactly 2 digits — plan >=100 is out of the token grammar (#2232 seam). Pinned as asymmetry, NOT symmetry. - m1.3 leading-zero 007 -> not-canonical rejection at every position/form. - m1.4 slug abuse: parse DROPS a null-byte/control/unicode/emoji trailing slug (never stored, never mis-read as a plan) and rejects a line terminator; toDir's allow-list sanitizer collapses each to a safe [a-z0-9-] token or rejects sanitize-to-empty. - m1.5 absolute-path slug sanitizes (next to the ../../etc traversal test); an absolute-path project on a hand-built id is rejected by PROJECT_ID_RE; an abs-path string is not a bracket id; an abs-path dir slug is dropped to a clean tuple. - m1.6 whitespace-only -> not-a-bracket-phase-id. - m1.7 very-long input (10k) resolves promptly (ReDoS smoke, behavioral): garbage/partial-prefix throw; a 10k-char slug parses (dropped)/sanitizes. No accept-not-reject case is a src bug: parse never STORES an abusive slug (dropped from the identity tuple) and toDir independently re-sanitizes on emit, so the only slug reaching disk is allow-listed. Plan >=100 accepted by parse is the documented positional design (toDir drops the plan; the read-token caps it) — divergence pinned, not papered over. Probe-falsify: corrupted one assertion in each of the 7 groups (m1.4 both its parse-side and emit-side), ran -> 8 distinct named failures, reverted -> 66/66 green. Confirms every new group executes and can fail. Gates: tests/adr-612-bracket-grammar.test.cjs 66 pass / 0 fail; grammar + continuation-grammar-parity + collision-characterization + phase-id family 175 pass / 0 fail; `npm run lint:ci` exit 0. `npm run test:unit` is green except one pre-existing, unrelated env failure (npm-integrity-gate: a live npm-audit advisory in the production dep tree — reproduces with this change stashed; no package.json/lock change here). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.8 (1M context) <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.