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* test(#3241): failing-first suite for the codex passive model posture Locks ADR-2313's D1-D5 before any production code exists, so the tests bind to the behavior rather than to whatever the implementation happens to do. Red-first (fail against the current tree): - the resolver path emits no `model` and no `model_reasoning_effort` - a whitespace-only model_overrides value yields no pin - isAnthropicFlavoredModel / CLAUDE_AGENT_ALIASES on model-catalog - the one-time install notice, and its once-per-install dedupe Regression guards (pass today, must keep passing): resolver-null via `inherit` and via absent runtime; a resolver that resolves to nothing; empty-string and non-string overrides; and the light-tier service_tier/model_verbosity fields, which are NOT coupled to the model pin and would silently regress if the implementation coupled them. Classifying each test as red-first or regression guard is deliberate. A test that passes on both sides of the change proves nothing, and this epic has already shipped two such rows before catching them. The whitespace case is a live defect, not a quirk: `' '` is truthy, survives the type guard, is not Anthropic-flavored, and is embedded verbatim as `model = " "` — the same class the #2310 guard exists to stop. Same function, same path, fixed in this phase per CLAUDE.md §3. Two matrix rows were dropped as vacuous rather than shipped green: a 64-char truncation case (the pinned notice interpolates no user-controlled value, so it cannot exhibit truncation) and a newline hazard that the input surface cannot reach. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> * feat(#3241): omit the codex per-agent model by default Implements ADR-2313 D1-D5. generateCodexAgentToml no longer embeds the runtime resolver's per-tier Codex model, so an agent inherits the always-available session model instead of a pin a ChatGPT-account Codex may not expose. model_reasoning_effort disappears with it via the existing hasPinnedModel coupling (#838) — no logic change needed there. Supersedes #2517's embedding on the default path only. An explicit real-Codex model_overrides pin is still embedded verbatim, and the #2310 Anthropic-flavored guard is retained: the model_overrides route to it is still live even though the resolver route is now unreachable. The shared rule moves down a layer. CLAUDE_AGENT_ALIASES leaves model-resolver for model-catalog — a genuine leaf importing only node:path and its own JSON — with isAnthropicFlavoredModel defined beside it, and is re-exported from model-resolver so every existing importer is untouched. This is what lets Phase 2's install-check and Phase 3's sync consume the rule without taking the config-loader dependency model-resolver would have dragged into a module documented as pure read/verify with 33 dependents. A parity test fails if the two ever fork. Also fixes a live defect surfaced while writing the tests: a whitespace-only model_overrides value was truthy, survived the type guard, was not Anthropic-flavored, and so was embedded verbatim as `model = " "` — the same class the #2310 guard exists to stop, reached by a different route. Trimmed before the truthiness test. It is deliberately not routed through _warnCodexModelOverrideDropped, whose text would misdescribe a blank field as a mis-typed model. Adds the one-time install notice (maintainer direction, recorded as an ADR-2313 amendment): one stderr line naming model_overrides and the session model, deduped per install rather than per agent, and emitted only for the population that actually loses a pin. service_tier and model_verbosity stay decoupled from the model (#774); a regression guard asserts they still emit with nothing pinned. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> * docs(#3241): amend ADR-2313, add the model-catalog glossary entry ADR-2313 gains two dated amendments rather than edits to its merged text, since ADRs here are append-only. The first records that a deprecation notice IS offered, reversing the Migration section's "no deprecation window" position, and states why that position was wrong rather than just superseding it: the ADR identified the API-key population as losing something real and then declined to warn it, in the same document. Hyrum's guidance was applied to the recourse and not to the notice. The second records the whitespace-only model_overrides defect and notes that D2 always implied the fix — the implementation simply never enforced it and no test covered the case. CONTEXT.md gains a Model Catalog Module entry. The module had none, which is why the glossary gate passed without one: check-glossary-refs verifies that references resolve, not that modules are documented. The entry records why the Anthropic-flavored rule lives there rather than in model-resolver, so a later reader does not "helpfully" move it back. The Model Resolver entry is updated to point at its new home and note the back-compat re-export. docs/CONFIGURATION.md carried a claim that is now false: that the resolved tier ID is embedded into agent frontmatter at install time on codex and opencode. Corrected to name codex as the exception, with the 400 symptom and the model_overrides recourse. Changeset leads with the user-visible change and the migration line rather than the implementation, per the ADR's Hyrum's-Law analysis. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> * fix(#3241): only notice a lost pin when one was actually embeddable Review finding from an isolated reviewer. The deprecation notice gated on whether the runtime resolver would have returned *any* model, but the question that matters is whether that model would have been *embedded*. Those differ. The #2310 safety gate already rejected an Anthropic- flavored model arriving from the resolver path before Phase 1 — so for a mixed-runtime config resolving to a claude-* id against a Codex install target, the user never had that pin. The notice told them they lost something they never got, and pointed them at model_overrides for no reason. The existing #2310 test drives exactly that path but asserts only the emitted `model` line, never stderr, which is why it slipped through. Now covered. Deliberately unchanged: an Anthropic-flavored model_overrides value plus a legal resolver model fires BOTH the override warning and the notice. That is correct — pre-Phase-1 the guard dropped the override, execution fell through to the resolver, and the resolver's model was embedded, so that user did lose a pin. Two messages, two distinct true facts, and the prefixes differ (`gsd: warning — ` vs `gsd: notice — `) so the one-notice-per-install contract holds. A regression test now pins that behavior so it does not get "simplified" away. Of the three tests added, only the first is red-first; the other two pass on both sides by design and are labelled as guards — one against over-correcting the fix into silence, one against removing the intentional double message. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> * fix(#3241): reset the notice dedupe via a seam, not a require.cache bust The remote runner caught a regression I introduced: the #2760 post-write-validation test began failing with the validator override no longer intercepting. Cause, confirmed by trace rather than guessed: the new #3241 review tests deleted require.cache for bin/install.js and re-required it mid suite, to clear the notice's module-level dedupe flag. But runCodexInstall destructures `install` at file load, closing over the ORIGINAL module's exports. After the cache bust a second instance existed, so the test's `installModule.__codexSchemaValidator = ...` mutated the new object while the code under test still called the old one. The override silently stopped intercepting, the real validator ran and passed on GSD-emitted output, and the abort-and-restore path was never exercised. Cache-busting a module mid-suite breaks every later test that assumes a single instance, which every other test in the file is entitled to. So the fix is a seam, not a workaround: bin/install.js exports _resetCodexNoticeDedupeForTests(), and the three tests call it directly instead of reloading the module. The flag is module-level by design — the dedupe is per-install and install() already resets it — so a unit test driving generateCodexAgentToml directly needs an explicit way to reset it. That is now what it has. Swept the rest of the #3241 diff for the same hazard; this flag was the only shared module-level state introduced. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> * fix(#3241): reset both codex dedupe stores, not just the notice flag Second incomplete fix, same class one layer down. bin/install.js keeps TWO module-level dedupe stores and the require.cache bust I removed had been papering over both; my replacement seam cleared only one. _codexModelOverrideDroppedWarned is a Set keyed `${agent}::${value}`. tests/codex-config.test.cjs:558 already emits for `gsd-executor::sonnet`, so by the time the review test using the same agent and value ran, _warnCodexModelOverrideDropped was a silent no-op and the expected warning never appeared. The seam now clears both stores and is renamed to say so. Its comment records that per-install dedupe lives in module scope deliberately and that this is the single sanctioned way for a unit test to clear it. Swept bin/install.js for every other module-scope mutable a test could latch. Two are inert (capability registries assigned once at require time; selectedRuntimes computed once from argv). One is a genuine latent hazard and is deliberately NOT folded in: attributionCache (:1654) memoizes getCommitAttribution by runtime name for process lifetime, so two in-process installs of one runtime with differing attribution config would collide. It is unreachable from any current test and is a different concern from Codex warning dedupe, so it stays out of this PR rather than widening it. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> * docs(#3241): correct the codex tier-routing how-to The docs gate forced the task-oriented quadrant and found the worst defect in this change's documentation surface. docs/how-to/configure-model-profiles.md carried a section titled "If you want tiered models on Codex" telling users to set runtime:codex + model_profile:balanced, promising "GSD resolves each tier alias to the Codex-native model and reasoning effort defined in the runtime tier map." That is exactly the behavior this PR removes — a how-to page confidently instructing users to do something that no longer works, which is worse than a missing page because it fails at the moment of use. Rewritten to state that Codex does no tier routing, give the model_overrides pin as the supported alternative, and name the two constraints on what may be pinned: it must be a real Codex model id, and the account must actually expose it — GSD cannot verify the second, so the honest advice when unsure is to omit the pin. Carries an upgrade note for both account types, since the change is a no-op for ChatGPT accounts and a real loss for API-key ones. Also tightened the same page's claim that Codex "embeds the resolved model" at install time — now true only of an explicit override. The re-install instruction it supports is still correct and still needed, so only the premise moved. Both the required-docs set (COMMANDS.md + FEATURES.md) and lint-docs-required.cjs would have passed before this commit, since CONFIGURATION.md and the ADR had already moved. Neither checks the quadrant a user in trouble actually opens. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> * chore(#3241): backfill changeset pr number (#3276) --------- Co-authored-by: sim <sim@local> Co-authored-by: Claude Opus 5 <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.