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* test(#1951): add failing-first tests for reversibility tagging Red phase for issue #1951 (reversibility tagging: classify decisions by undo cost, gate one-way doors behind a checkpoint:decision). Tests assert, per the issue's acceptance criteria: - discuss-phase CONTEXT.md template records a **Reversibility:** field with a rationale on captured decisions, and states it is optional - gsd-planner @-references planner-reversibility.md and stays under the 49152-char agent cap (LARGE_CAP, tests/agent-size-budget.test.cjs) - a one-way rating inserts a checkpoint:decision before the dependent task; reversible inserts none; costly is flagged but never blocks - the taxonomy defaults to reversible when unsure (checkpoint-fatigue guard) and inserting a checkpoint implies autonomous: false - docs/reference/plan-md.md documents <reversibility> as optional with all three ratings - --no-reversibility-gates parses to REVERSIBILITY_GATES=false, is injected into the planner prompt, and is advertised in the command argument-hint and help full mode (argument-hint parity) - the override suppresses the gate but still persists the rating - cmdVerifyPlanStructure accepts every rating and the absent case (additive-validator guarantee, behavioral via runGsdTools) - parity: thinking-models-planning.md #4 adopts the canonical three-level taxonomy and the binary REVERSIBLE/IRREVERSIBLE vocabulary is gone - no content loss from the planner extraction made to fit under the cap Prose-contract assertions are Red until the implementation lands. The behavioral validator assertions pass immediately — regression guards proving the validator already accepts unknown optional tags. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * feat(#1951): reversibility tagging — gate one-way-door decisions Classify planning decisions by what undoing them would cost, and give a one-way door a human beat before the agent walks through it (issue #1951, The Pragmatic Programmer Topic 15 'Reversibility'; Bezos's one-way/two-way door framing). Acceptance criteria met: - discuss-phase records an optional reversibility rating with a rationale on <decisions> entries in the phase CONTEXT.md template. Unrated decisions are treated as reversible, so existing phases are unaffected. - a one-way rating makes gsd-planner insert a checkpoint:decision before the task that implements the decision, reusing the existing checkpoint mechanism -- no new checkpoint machinery. - reversible ratings trigger no checkpoint; costly ratings are flagged in the plan but never block. - the rating persists on the task as the optional <reversibility rating=> element. cmdVerifyPlanStructure accepts every rating and the absent case; the structural validator does not reject unknown optional tags. - --no-reversibility-gates (REVERSIBILITY_GATES=false) suppresses checkpoint insertion for intentionally-unattended runs while still recording ratings -- the override changes what stops the run, not what the plan remembers. Single taxonomy, not two: references/thinking-models-planning.md #4 already shipped a binary REVERSIBLE/IRREVERSIBLE classification and is loaded by both gsd-planner and gsd-plan-checker. It is rewritten onto the canonical three-level vocabulary and now points at planner-reversibility.md as the taxonomy owner, with a parity test that fails if the surfaces diverge (DEFECT.GENERATIVE-FIX-DIVERGENCE). agents/gsd-planner.md sat 47 chars under the 49152 LARGE_CAP, so the checkpoint DO/DON'T guidance was relocated verbatim into planner-antipatterns.md -- already @-referenced from the same section for the same topic, so the planner still loads it and nothing was dropped. A test guards the relocation against content loss. Files: gsd-core/references/planner-reversibility.md (NEW, canonical taxonomy + emission rules + anti-patterns), gsd-planner.md, plan-phase workflow/command/help (flag wiring + parity), plan-md.md schema, discuss-phase context template, CONTEXT.md glossary, INVENTORY + manifest, size baselines, install goldens, plugin skills regen, changeset. Closes #1951 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * fix(#1951): address orthogonal review findings Two isolated reviewers (correctness + security), neither of which authored the change. Every finding fixed: Security — the rationale is untrusted input (ADR-1577). It originates in conversation and flows CONTEXT.md -> planner -> PLAN.md -> executor, each hop an LLM reading the previous hop's output, with no validation on the path. planner-reversibility.md and the discuss-phase template now state it is data and never instructions, and name the </reversibility> early-termination hazard explicitly -- a rationale that closes its own element injects sibling structure the executor reads as real tasks. Four tests guard it. Correctness 1 — nothing machine-enforced the feature's own promise: a task rated one-way with no preceding checkpoint:decision validated as fully clean, so a planner error silently reopened the gap this feature exists to close. cmdVerifyPlanStructure now warns on an ungated one-way rating. A warning, not an error: <reversibility> stays additive and the plan stays valid. Four tests cover ungated (warns), gated (silent), still-valid, and reversible/costly never flagged. Correctness 2 — pass-always test. The --no-reversibility-gates parse test substring-matched the whole workflow file, and plan-phase.md prose mentions both tokens in one sentence, so it passed with the bash conditional deleted: it was testing the documentation, not the parser. Now scoped to the fenced bash blocks and matched as one physical line, with a negative control confirming prose alone cannot satisfy it. Correctness 3 — costly had no itemized emission rule, only one-way did, so two agents could diverge on whether to tag costly at all. Correctness 4 — template convention break: the example ratings were bare while every sibling field uses [...] to signal substitution, inviting an LLM to copy one-way/costly forward as boilerplate. Now bracketed. Correctness 5 — latent false-green: .includes('reversible') also matches inside irreversible/irreversibility, which appear in anti-pattern prose, so a surface that dropped the real taxonomy entry would still pass. Now word-boundary matched. ADR-857 phase-6 ceiling — the first gsd-test run caught plan-phase.md 1216 bytes over its frozen 94519 ceiling (it had 49 bytes of headroom on next). The ceiling may only rise for privileged host machinery, and reversibility gating is optional-feature logic, so the wiring was slimmed to its minimum and the explanatory prose moved to the reference files the planner already loads. plan-phase.md is now 94400 bytes -- 119 under the ceiling and 70 bytes SMALLER than on next, so the host loop shrank while gaining the feature, which is what phase 6 ratchets toward. The tracer contract (tests/tracer-bullet.test.cjs) is unchanged. Lint — fixed an unnecessary non-null assertion in verify.cts and a CRLF-fragile bare \n regex in the new test (DEFECT.WINDOWS-CRLF-TEST- PORTABILITY, the #1658/#1668/#2206/#2449/#2450 class). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * test(#1951): checkpoint fixture must carry the common task elements The gated-one-way fixture built a checkpoint:decision task from the abbreviated skeleton in gsd-planner.md, which shows only the checkpoint-specific elements (<decision>/<context>/<resume-signal>). cmdVerifyPlanStructure requires <name> and <action> on EVERY task regardless of type, so the fixture failed validation for reasons that had nothing to do with reversibility: errors: ["Task missing <name> element", "Task 'unnamed' missing <action>"] Caught by gsd-test on 14d14a39 (2 failures, both this fixture). The canonical shape is in tests/verify.test.cjs:266 — a checkpoint task carries <name>/<files>/<action>/<verify> like any other. Fixture corrected to match. Verified behaviorally against the real gsd-tools CLI across all four cases: gated one-way (valid, silent), ungated one-way (valid, warns), costly (valid, silent), absent (valid, silent). Not a product defect: the validator's every-task contract is intentional and pre-existing, and docs/reference/plan-md.md scopes its required-element list to type=auto/tracer only because those are the elements a planner must author, not because checkpoints are exempt from <name>. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * chore(#1951): backfill changeset pr number to 2471 * fix(#1951): CodeQL incomplete-sanitization + prompt-injection scan collision Both CI failures were real defects in code this PR added, not false positives. CodeQL js/incomplete-sanitization (high), reversibility-tagging.test.cjs:46 — the namesRating helper built its regex with `rating.replace(/[-]/g, '\\-')`, which escapes the hyphen but not backslash, so the escape was incomplete. It was also unnecessary: `-` carries no special meaning outside a character class. Replaced with a complete metacharacter escape (backslash included). Word-boundary behavior verified unchanged across all three ratings — notably that "irreversible" prose still does not satisfy a "reversible" match, which is the false-green this helper exists to prevent. Prompt injection scan — the checkpoint fixture used the human-verification child element inside <verify>. That tag name is a fake-instruction-boundary pattern in scripts/prompt-injection-scan.sh, and the scan runs over changed files, so copying the shape from tests/verify.test.cjs (unflagged only because it is not in this diff) tripped the gate. Switched to the documented plain-prose <verify> form. The first attempt at that fix failed the same gate a second time: the comment explaining the collision quoted the offending tag literally. The comment now names it in prose instead — the scanner does not care whether a match is code or commentary, which is the whole point of the DEFECT.PROMPT-INJECTION-SCAN-COLLISION note in CLAUDE.md. Verified locally before push: scan reports 0 findings across 57 changed files, eslint clean, and both fixtures still validate as designed (gated one-way silent, ungated one-way warns, neither errors). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * test(#1951): record measured cost and halve gsd-tools spawns The Windows shard 1/3 job timeout was traced to the sharding layer, not to this PR's assertions — see #2472. Two contributing factors were this file's own, and are fixed here. 1. tests/test-timings.json had no entry for reversibility-tagging.test.cjs, so scripts/run-tests.cjs weighted it at the table's median fallback (~315ms) for LPT chunk packing. It actually measures 5595ms — an 18x under-weight. Recorded the measured value from the green gsd-test run (max across the node22/node24 lanes, per gen-test-timings.cjs's convention). Only this one entry: a full regen churns 634 entries of run-to-run drift, and the table is explicitly advisory and un-gated, so a 637-line diff does not belong in a feature PR. 2. Each verifyPlan() spawns gsd-tools, which dominates this file's cost. Spawns cut from 9 to 6 with no coverage lost: - the ungated-one-way warning and its stays-valid assertion now share one plan instead of building the same plan twice; - the reversible/costly never-flagged-as-ungated test was strictly subsumed by the additive suite, which already runs those two ratings ungated and asserts no /reversibilit/ warning at all — and the gate warning's text contains both "reversibility" and "one-way", so the broader assertion catches it. It only re-spawned gsd-tools twice to prove the same thing. Both are symptom fixes. The shard imbalance itself (19/11/10 minutes against a 20-minute cap, from a cost-blind round-robin partition that also reshuffles downstream files whenever one is inserted) is tracked in #2472. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * test(#1951): checkpoint fixture adopts the #2444 type-branched contract Surfaced by rebasing onto next, which gained #2444 (branch plan-structure validation on task type=checkpoint:*) while this PR was in review. cmdVerifyPlanStructure no longer applies one required-element set to every task. A checkpoint:decision now requires <name> + <resume-signal> + <decision> + <options>, and is exempt from the <action>/<verify>/<done>/ <files> set that auto and tracer tasks carry. The gated-one-way fixture predated that split and failed on the new requirement: errors: ["Task 'Task 0: Confirm the on-disk format' missing <options>"] Fixture rewritten to mirror the checkpoint:decision contract exactly — real <options> with two <option> children — rather than padding it with fields checkpoints no longer need. That also drops the plain-prose <verify> the earlier revision carried purely to dodge the prompt-injection scan; a checkpoint task has no <verify> requirement at all, so the workaround is moot. Verified against the real gsd-tools CLI across all four cases: gated one-way (valid, silent), ungated one-way (valid, warns), costly (valid, silent), absent (valid, silent). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.8 <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.