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* test(#2847): add failing-first regression tests for gap-closure frontmatter schema gap --gaps did not load a machine-checked requirement for gap_closure: true. The planner's only validation gate (frontmatter.validate --schema plan) never required it, and plan-phase.md's downstream_consumer contract never mentioned it either, so gap-closure plans could pass validation while missing the field that /gsd:execute-phase --gaps-only filters on. These tests are RED against current production code: no plan-gap-closure schema exists yet, and neither agents/gsd-planner.md's validate_plan step nor plan-phase.md's downstream_consumer block references gap_closure conditionally. * fix(#2847): enforce gap_closure via plan-gap-closure schema --gaps did not load a machine-checked requirement for gap_closure: true. The planner's only validation gate (frontmatter.validate --schema plan) never required it, so a gap-closure plan could pass validation while missing the field /gsd:execute-phase --gaps-only filters on, silently spawning zero executors. Add a plan-gap-closure schema (every plan-required field plus gap_closure) and make the planner's validate_plan step select it when gap_closure mode is active, plan otherwise. Standard/reviews-mode plans are unaffected: plan's required fields are unchanged. plan-phase.md's downstream_consumer block was investigated for a symmetric mention but deliberately left untouched: it sits 36 bytes under the frozen ADR-857 PRE_PHASE6 ceiling and the validate_plan step in gsd-planner.md is the actual call site, needing no help from plan-phase.md's prose. * fix(#2847): compact validate_plan edit under gsd-planner.md size caps Merging origin/next (7 commits, including #2775's gsd-planner.md STRIDE-row edit) left only 22 chars of headroom under four separate hard-coded 49152-char caps on gsd-planner.md (planner-decomposition, precondition-element, reversibility-tagging, security.test.cjs). The verbose validate_plan prose from the previous commit overran all four. Compact the edit to a single line (net +17 chars vs origin/next) while keeping the functional content: schema name, mode condition, and the unchanged base required-fields list. Also: - Fix a real bug in the fix-2847 negative-assertion test: plan-phase.md mentions the literal string "<downstream_consumer>" twice in backtick-quoted prose before the actual opening tag, so a plain indexOf() grabbed the wrong start position and swallowed ~10KB of unrelated content (including a "gap_closure" hit in a Mode: enum line), producing a false failure. Anchor on the tag starting its own line instead. - Merge the emitted-drift-ack fragment for gsd-planner.md with the #2775 fragment brought in by the merge (both named the same path; two ack sources may never name the same path) and correct its byte delta to the actual final number. * fix(#2847): drop stale merge-inherited emitted-drift-ack fragments Merging origin/next brought in three new emitted-drift-ack fragments (1700, 2658, 2775) relative to this branch's fork point. #2775 collided with my own gsd-planner.md key and was already consolidated. #1700 and #2658 don't collide, but none of their entries name a path this branch's actual diff touches (git diff --name-only origin/next...HEAD) — the ripples they explain are already baked into the current next baseline, so they explain nothing here and the emitted-attribution gate correctly reports them as stale (verified live: spike-wrap-up.md from #1700). Delete both fragment files. Neither is referenced by any test beyond a stray comment pointing at an unrelated diagnosis artifact path, not the ack fragment itself. * fix(#2847): restore merge-inherited ack fragments deleted in error 1700-spike-manifest-idea-scoping.json and 2658-trae-instruction-file-path.json exist on origin/next (landed via other, already-merged PRs) and arrived on this branch unchanged via the origin/next merge. The previous commit deleted them to satisfy a stale-acknowledgment finding, but the finding was about the acks being MODIFIED in this diff, not about needing to stop existing — deleting them would have silently reverted two other PRs' already-merged, already-justified byte growth. Restored byte-identical to origin/next (git diff origin/next -- <path> empty for both). 2775-planner-package-legitimacy-gate.json stays consolidated into 2847-gap-closure-validate-plan-step.json: that one was a genuine hard key-collision (two fragments naming the same gsd-planner.md path, which lint-emitted-drift-ack hard-blocks), not a pass-through case. * fix(#2847): bind --schema to gap_closure mode, not hardcode it Prior revision left the validate_plan bash invocation unconditional (--schema plan)) while only the prose sentence above it described the gap_closure-mode branch. An agent executing the shown line literally always validated with the plan schema, so a gap-closure plan missing gap_closure: true still reported valid:true — #2847 reproducing unchanged. Existing tests didn't catch it: they checked for substring presence anywhere in the step, which the prose alone satisfied. Change the bash line to --schema "$SCHEMA" — a real shell-variable reference in the same placeholder convention this file already uses for "$PLAN_PATH" (never literally assigned; the agent resolves it from context, same as PLAN_PATH). A genuine if/then bash conditional already exists elsewhere in this file (load_project_state's INIT @file: check), confirming executed conditionals, not merely descriptive prose, are the established pattern here. Rewrite the regression test to assert on the bash block's literal --schema argument: reject a hardcoded plan) or plan-gap-closure) literal, require a variable reference, and require the step's prose to bind that same variable name. Verified RED against the prior revision and GREEN against this one before committing either state. * fix(#2847): CRLF-safe tests, drop unexplained ack, require gap_closure=true Four items from independent review, all landing together per request: 1. The #2847 regression test file had two CRLF-fragile regexes (local/no-crlf-fragile-split): a bare \n on readFileSync content means a real \r\n checkout returns invocationLine === null and all four executable-content assertions stop asserting anything while still reporting green. Both now use \r?\n. Prior lint report of exit 0 was a false green from a stale eslint cache. 2. The 2847 drift-ack fragment explained nothing: a direct edit to agents/gsd-planner.md is self-explaining, drift-acks exist for emitted-artifact ripple that cannot be traced to a changed source path. Deleted. Restored the 2775 fragment byte-identical to next (git diff --name-status next...HEAD -- tests/emitted-drift-acks/ now prints nothing) — it only conflicted with the now-deleted 2847 fragment, never needed touching itself. 3. plan-gap-closure validated gap_closure by PRESENCE only (unchanged since the original #2847 fix), so gap_closure: false satisfied it — --gaps-only filters strictly on gap_closure === true, so a false-valued plan still validates green and still spawns zero executors: #2847's exact reported symptom, one value away. Added an optional requiredValues map to FRONTMATTER_SCHEMAS; plan-gap-closure now requires gap_closure to equal the string "true" (extractFrontmatter parses every scalar as a string) in addition to being present. Every other schema/field keeps the original presence-only contract. The row that had documented the hole instead of closing it now asserts the fix; a matching unit test locks requiredValues on FRONTMATTER_SCHEMAS. 4. The "names the plain plan schema" assertion matched the bare substring "plan" anywhere in the step, which verify.plan-structure satisfies incidentally a few lines below — the assertion could not fail even if the plain-plan branch were deleted from the prose. Changed to match the standalone backtick-quoted plan token. * fix(#2847): remove contradictory leftover assertion in Row 6 test The gap_closure:false test asserted !present.includes('gap_closure') (correct — matches the implementation's fold-wrong-value-into-missing semantics) immediately followed by a stale, unedited leftover from an earlier draft of the same test asserting the opposite: present.includes('gap_closure'). The second could never pass once the first did; both were in the same diff. Verified before committing: searched every consumer of frontmatter.validate output (agents/gsd-planner.md, docs/CLI-TOOLS.md, all other test files) for any read of the present field — none exist. Nothing depends on "present" meaning "physically exists regardless of value correctness", so the implementation's fold (present/missing stay a full partition of required) is the right call; the test needed to agree with it, not the other way around. Manually replayed all six rows in the plan-gap-closure describe block against the built CLI to confirm each now passes. * fix(#2847): prototype-key guard, wrong-value diagnostic, doc fixes, vacuous tests Six items from an independent SHIP_VERDICT:no review, landing together per request: 1. Prototype-key crash (src/frontmatter.cts): FRONTMATTER_SCHEMAS[schemaName] was an unguarded lookup, so --schema __proto__ (also constructor, toString, hasOwnProperty, valueOf) resolved to an Object.prototype member instead of undefined, the `!schema` check never fired, and the command crashed with an uncaught TypeError and a stack trace instead of "Unknown schema". Now reachable from prompt state (--schema is an agent-bound $SCHEMA), not just an unreachable literal. Guarded with Object.prototype.hasOwnProperty.call before the lookup, checked and rejected before assignment so `schema`'s type stays non-optional. Added a test for all five prototype keys. 2. Wrong-value diagnostic (src/frontmatter.cts, agents/gsd-planner.md): the strict gap_closure === "true" check from the previous fix was correct (fail-closed) but silent about WHY — a plan with gap_closure: True got "missing", indistinguishable from genuinely absent, even though the field is plainly in the file. Added an `invalidValue` field to the validate JSON (present but wrong-valued, disjoint from missing/present) and updated validate_plan's prose to state the exact required literal and explain invalidValue, within the remaining byte budget (49130/49152). 3. docs/reference/plan-md.md: fixed three inaccuracies in the gap_closure row — "this field plus every field above" implied `requirements` (documented Required: Yes) is schema-enforced, it is not; "Type: boolean" implied YAML True/TRUE/yes/1 are accepted, they are rejected (exact string match on literal lowercase true); "must never carry it" stated an unenforced rule as fact. Also switched /gsd:plan-phase and /gsd:execute-phase to the house-style hyphen form for docs/. 4. Vacuous negative assertions (tests/fix-2847-gap-closure-frontmatter.test.cjs): RegExp#test coerces a null invocationLine to the string "null", so both hardcoded-literal checks passed vacuously even if the step or its bash block were deleted entirely. Added a truthy precondition check first. 5. Deleted vacuous/pass-always tests: four in tests/frontmatter.unit.test.cjs strictly subsumed by (or, for the "superset" test, tautologically guaranteed by the same spread as) the deepEqual exact-list test; two describe blocks in the #2847 regression file that were already GREEN at the RED commit (5e5897cd2f17ebf2fc55757bae651bbbeb236289) and pinned untouched files rather than covering anything this change altered — one of them additionally forbade any future legitimate gap_closure mention in plan-phase.md, a trap for whoever frees up that file's byte budget later. 6. .changeset/clever-newts-wake.md: switched /gsd:plan-phase and /gsd:execute-phase to /gsd-plan-phase and /gsd-execute-phase — changesets render verbatim into CHANGELOG.md with no converter in the path, so the colon form would have reached readers naming a command no runtime registers. * chore(#2847): backfill changeset pr number (#3018) --------- Co-authored-by: sim <sim@local>
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.