1720aacf0c
* test(#1949): add failing-first tests for <precondition> element Red phase for issue #1949 (Design by Contract: <precondition> element asserted before task execution). Tests assert: - docs/reference/plan-md.md documents the new <precondition> element - agents/gsd-planner.md @-references planner-preconditions.md and stays under the 49152-char cap (progressive-disclosure requirement) - gsd-core/references/planner-preconditions.md exists and documents the three emission cases mandated by the issue (user_setup / prior-phase artifact / env-var) and the contract triad mapping - agents/gsd-executor.md asserts <precondition> before task execution and routes unmet preconditions through existing checkpoint machinery - cmdVerifyPlanStructure (behavioral via runGsdTools) accepts plans both with and without <precondition> — the additive-validation guarantee - Parity assertion: plan-md.md and planner-preconditions.md agree on the canonical tag spelling (DEFECT.GENERATIVE-FIX-DIVERGENCE guard) Most 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). * feat(#1949): <precondition> task element — Design by Contract Add an optional <precondition> element to <task> in PLAN.md (issue #1949, The Pragmatic Programmer Topic 23). The front-of-task side of the plan contract — preconditions (before) ↔ postconditions (<verify>/<done>/ <acceptance_criteria>, after) ↔ invariants (must_haves.truths, across the whole plan). Together with the tracer-bullet proposal (#1945), this closes both ends of the 'outrunning your headlights' failure mode for an autonomous AI executor. Acceptance criteria met: - <precondition> is an optional element on <task>; plans that omit it validate unchanged (cmdVerifyPlanStructure checks for presence of required tags, does not reject unknown optional tags). - gsd-executor evaluates the precondition before any other task work. Unmet halts execution with a checkpoint:human-verify and no partial commit; met or absent produces no visible change to execution flow. Unmet is never auto-approved under AUTO_CFG=true — a missing prerequisite is a fact the executor cannot establish on its own. - gsd-planner emits <precondition> in exactly the three cases the issue mandates: user_setup consumption, prior-phase artifact dependency, and env-var/runtime-config dependency. - Tests cover met, unmet, and absent preconditions plus the additive- validator guarantee. Files: - gsd-core/references/planner-preconditions.md (NEW): full emission rules, the three cases with worked examples, format guidance, anti-patterns, the contract triad mapping, and the executor assertion contract. Progressive disclosure. - agents/gsd-planner.md: slim <precondition> note in Task Anatomy with @-reference to the new file. To stay under the 49152-char agent-file cap (27-char headroom before this change), the inline <comment_text_discipline> and <region_scoped_negative_gate> summaries are compressed to one-line pointers — their full rules already live in planner-antipatterns.md, so no content is lost. - agents/gsd-executor.md: new step 0 'Precondition check' in the execute_tasks loop, before the type dispatch, routing unmet through checkpoint_return_format. - docs/reference/plan-md.md: new Preconditions section in the schema reference, with the canonical example and the three emission cases. - CONTEXT.md: Precondition glossary entry as a sibling of Tracer Bullet. - docs/INVENTORY.md + INVENTORY-MANIFEST.json: row for the new references/planner-preconditions.md (regen via gen-inventory-manifest). - tests/precondition-element.test.cjs: failing-first tests covering schema docs, planner emission contract, executor assertion contract, reference-file presence + the three cases, behavioral additive- validator guarantee, and a parity assertion (DEFECT.GENERATIVE-FIX- DIVERGENCE guard). - .changeset/quick-hawks-bark.md: Added fragment. Companion to #1945 (tracer bullets). * chore(#1949): regen agent-size baseline + install-tree goldens Documented baseline regenerations required by the feat(#1949) prose changes (RULESET.AGENT_SIZE_BUDGET + golden-install-parity): - npm run size:baseline — locks in the new gsd-executor.md size (+1050 bytes: the precondition-check step 0 block). gsd-planner.md is net smaller (-142 bytes: compressed two inline summary blocks whose full rules already lived in planner-antipatterns.md to make room for the slim <precondition> pointer). No hard-cap breach. - npm run gen:golden — pick up the new references/planner-preconditions.md + the two changed agent files across all 18 runtime install trees. Both regens are CI-mandated after intentional agent/reference changes; see CLAUDE.md 'RULESET.AGENT_SIZE_BUDGET' and the comments in tests/golden-install-parity.test.cjs. * fix(#1949): bound <precondition> checks to read-only (security review) Apply the security-review finding (LOW, isolated /security-review subagent): the executor's 'run the cheapest check' phrasing for a plan-author-controlled prose line was broader than ideal — a hostile plan author could craft a <precondition> whose 'cheapest check' is side-effecting (curl to an attacker host under the guise of verification, rm -rf before checking, secret emission). The risk is inherited from GSD's existing plan-trust model (<verify>, <action>, <done> already direct the executor to run arbitrary shell), so <precondition> does not materially expand it. But the new prose actively directs execution ('run the check') rather than passively consuming the element, so the bound is worth making explicit. Tightened across all four surfaces that describe the check shape: - agents/gsd-executor.md step 0: 'Verify with read-only checks only — file existence, env var presence (no value output), idempotent GET /health-style pings. Do NOT run commands with side effects (writes, network POSTs, secret emission) as the check; if a side-effecting check seems required, halt and surface via checkpoint instead.' - gsd-core/references/planner-preconditions.md Format section: same bound, plus the halt-and-surface escape hatch. - docs/reference/plan-md.md Preconditions section: mirrored. - CONTEXT.md Precondition glossary entry: mirrored. Regenerated agent-size baseline (executor grew 46186 -> 46440; still under the 49152 cap) and install-tree goldens. * chore(#1949): backfill changeset pr number 2422 Per CONTRIBUTING.md changeset workflow + feature-builder directive Step 8.7: backfill the placeholder pr:0 with the real PR number immediately after gh pr create returns. Avoids the fail_invalid_fragment gate. * fix(#1949): cite [#1949] on allow-test-rule exemption (ADR-456) CI's lint:ci runs lint-allow-test-rule-refs which per ADR-456 requires every // allow-test-rule: exemption on a NEW test file to carry an issue reference (#NNN or URL). My earlier push omitted it. Local 'npm run lint' (eslint) does NOT run this check — only 'npm run lint:ci' does. CLAUDE.md explicitly warns: 'lint:ci ≠ lint — CI runs lint:ci; a local pass is not the gate.' I should have run lint:ci before pushing; correcting now. Pattern matches the companion feature's test file: tests/tracer-bullet.test.cjs:1 // allow-test-rule: source-text-is-the-product [#1945]
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.