Update Est Fixtures

Update EST fixtures

Source of truth: packages/vm/DEVELOPER.md — Updating fixtures and What “green” means. Read that before changing files.

Workflow gates (mandatory)

This is a multi-phase workflow with hard stops. After each phase, stop completely — do not start the next phase in the same turn, even if the user said “let’s go” at the outset. “Let’s go” means begin the current phase; it does not waive later gates.

Commits and pushes: by default the human commits and pushes (fixtures repo after Phase A; monorepo after Phase B). The agent must not commit or push unless you explicitly ask for that step (e.g. “commit and push the fixtures repo”, “open the Phase B PR”). Never force-push.

Phase B must not start until the Phase A merge commit is on origin/main (or you explicitly allow a local fixtures SHA for a dry-run only).

If a round diverges, patch DEVELOPER.md first, then this file.

Replace vs add

• Glamsterdam mixed tree: default replace in place at dev/blockchain_tests/amsterdam/glamsterdam/. Upstream path: blockchain_tests/for_amsterdam/amsterdam/. Do not keep an old versioned folder beside it.
• BAL-only snapshots (v200_…, v301_…): keep unless this round says drop them.
• If unclear, ask before deleting or adding a tree.

Download once

Tarballs are large (~648 MB for tests-glamsterdam-devnet@v7.0.0). Download is preferred when practical, but only once:

• Work in execution-spec-tests-fixtures. .gitignore fixtures* covers fixtures_*.tar.gz and fixtures/.
• If the tarball is already on disk, reuse it (check size / sha256 from the GitHub asset). Do not re-download.
• Extract to gitignored fixtures/. Copy only state_tests / blockchain_tests into stable/ or dev/.

Phase A — fixtures repo

Scope: execution-spec-tests-fixtures only. Do not touch the monorepo submodule in this phase.

When the tree + README are ready, stop. Do not commit, push, or run monorepo tests unless explicitly asked. The human commits, pushes, merges the fixtures PR, then gives go for Phase B.

- [ ] Confirm tag + stable vs dev + replace vs add
- [ ] Download tarball once (or reuse); extract
- [ ] Copy consumed trees; apply ≳100 MB exclusions
- [ ] Replace previous glamsterdam folder when that is the policy
- [ ] Rewrite fixtures README (tags, folders, exclusions, JSON counts)
- [ ] Summarize: old vs new counts, what moved
- [ ] **STOP** — wait for human merge on fixtures repo

Summary must include old JSON count, new JSON count, folder names, exclusions, and a pointer to the upstream release. Confirm the working tree is ready for the human to commit (list any unstaged paths; tarball/extract dirs should stay gitignored).

Phase B — monorepo (only after explicit go)

Prerequisite: Phase A merged on execution-spec-tests-fixtures (origin/main), unless the human explicitly allows a local fixtures SHA for a first-round dry-run.

Fixtures commit must be reachable. Prefer origin/main after merge; a local SHA from the sibling fixtures checkout is fine for a first-round run (avoids GitHub SSH / macOS Touch ID).

If origin fetch is required and remote is git@ssh.github.com, tell the user they may need to confirm Touch ID before running fetch. Prefer the local fetch when both workspaces are open:

git -C packages/execution-spec-tests fetch origin
git -C packages/execution-spec-tests checkout origin/main   # or the merge SHA
# or, from the sibling fixtures repo:
git -C packages/execution-spec-tests fetch <path-to-execution-spec-tests-fixtures> <sha>
git -C packages/execution-spec-tests checkout <sha>

- [ ] Point packages/execution-spec-tests at the new SHA (do not commit unless asked)
- [ ] Update test:est:* in packages/vm/package.json if paths changed; CI if needed
- [ ] Grep the old folder name across the monorepo (package.json, consumeBAL.test.ts, generateLargeFixture.ts, DEVELOPER.md, this skill)
- [ ] Inventory (no tests): fixture eipNNNN dirs vs packages/common/src/hardforks.ts (HF eips list) vs packages/common/src/eips.ts
- [ ] Read upstream release notes; check packages/vm/src/params.ts (and Common EIP params) for address / constant drift
- [ ] First-round: npm run test:est:dev:blockchain:summary (from packages/vm). Also test:est:dev:state if state fixtures were added
- [ ] Report from the table + /tmp/est-dev-blockchain-summary.json
- [ ] **STOP** — wait for human review; commit/push monorepo PR only if explicitly asked

Do not use test:analysis:report for first-round (file-by-file, too slow). Do not start implementation in the same turn as this first-round report. Do not start Phase C in the same turn as the first-round report.

First-round report (layout)

Do not mix “what’s new upstream” and “what we need in EthereumJS” in the same paragraph or bullet list. Two columns / two tables, then the numbers.

Chat: a Cursor canvas (not a markdown-table dump). Open it beside the chat. Sections, in order:

1. Headline stats (pass/fail/total, runtime) + one callout for the dominant error cluster.
2. What's new (upstream only: release-note deltas, new addresses, EIP list ⬆️). No implementation advice here.
3. What we need (EthereumJS only): numbered, well-scoped blocks in implementation order. Put high-leverage / easy wins first (unblocks a lot of tests so later items are readable). Each block is one implementation unit. No restating the spec essay.
   • Target: the numbered list is a path to ~100% of the bumped mix (or ≥95% / the vast majority — say so if a handful of tests look like runner/fixture issues). Do not stop at the obvious EIP headlines if the first-round table still has large red directories.
   • Build items from both the release-note spec deltas and the first-round error clusters / per-directory failures. A cluster that would still fail after the headline delta (floor vs txGas, create-tx nonce on prep OOG, 7702 receipt gas, …) gets its own numbered item.
   • The leftover pass is a mop-up for interactions that only show up after earlier items, not the plan for hundreds of remaining tests.
4. Per-EIP table with both sides: EIP | What's new | What we need | Pass % | Packages.
5. Per-directory first-round table (from the reporter / JSON).
6. Inventory gaps (fixture dirs vs hardforks.ts / eips.ts, address mismatches).

GitHub PR body: the same structure as markdown tables (canvas is chat-only). Keep the two-column split. Link the fixtures PR and the upstream release.

Example (abbreviated):

## What's new (upstream)
| EIP | Change in this release |
| --- | --- |
| 2780 / 8037 | State-dep costs leave intrinsic; charged at top-frame |

## What we need (EthereumJS)
| EIP | Gap | Packages |
| --- | --- | --- |
| 2780 / 8037 | Split intrinsic vs runtime | vm, evm |

## First-round
| Directory | Passed | Failed | Pass % |

Phase B PR (only if explicitly asked)

After the first-round report, if GO asked to commit/push this step as a PR:

1. Commit the Phase B files (submodule gitlink, test:est:* path updates, leftover path greps, playbook/skill if they changed). Do not include implementation of spec deltas.
2. Push the current branch (-u if needed) and open a new monorepo PR (not a fixtures-repo PR).
3. Title: meaningful, e.g. Update EST glamsterdam fixtures to tests-glamsterdam-devnet@v7.0.0.
4. Body: the first-round report in the two-table layout (What's new vs What we need, then numbers) plus a link to the fixtures repo PR (or merge commit if already on main).
5. Labels, if they can be applied: package: vm, PR state: merge ready, type: spec updates, type: tests (exact names; note the space in package: vm).
6. CI test:est:dev:blockchain will fail until implementation. Mention that in the PR. Do not add type: test skip dev VM unless asked.

Return the PR URL. Then STOP (implementation is Phase C).

Phase C — implementation (one “what we need” item at a time)

The numbered What we need blocks from the first-round report are the spec-delta backlog. Do not start item N+1 until item N is done, unless asked. Each item is two steps, each with a manual stop (so a different model can pick up the next step).

Do not commit or push unless asked.

After those numbered items, if the bumped tree is not 100%, run a leftover pass (mop-up only: interactions that only show up after earlier items — not a second full backlog). Re-run :summary, cluster remaining failures, then C1 (cluster plan) → C2 until 100% or a leftover is clearly a runner/fixture issue (ask). Do not treat earlier item done-when percentages as the end of the round. If they asked to add this pass and act immediately, skip the C1 stop.

C1 — strategy (stop for confirmation)

Work out a plan only. Do not edit production code in this step.

• Structural: where to integrate (packages/files), what already exists vs what vN changed.
• Efficient path: order of edits, which EST folders prove the item, what to ignore until later items.
• API: backwards-compatible / preserving. May add to the public API if it is useful to library users. Do not rename or change existing signatures to get the spec green.
• Local tests: which test/api/EIPs/eip-NNNN.spec.ts (or existing suite) to add, matching nearby tests.
• READMEs: which package READMEs to update (see below).
• Done-when: local tests + named EST subsets (not “all 3707 green”). The numbered backlog should already cover a path to ~100%; the leftover pass is only for leftovers that appear after those items.

Chat: canvas (same visual bar as first-round). Then STOP. Implementation is C2 after they confirm.

C2 — implement (after confirmation)

Implement until the item’s done-when holds. Then STOP.

• Keep API stable; additions only if useful.
• Add local EIP tests that fit the existing packages/<pkg>/test/ layout (vm/test/api/EIPs/ is the usual home for fork behaviour). These speed up the next EST run and future local work.
• README updates (concise, consistent):
  • Canonical Amsterdam overview: packages/vm/README.md → Amsterdam hardfork (experimental) (EIP list + which specs this release implements / which EST snapshot).
  • Other touched packages (evm, tx, common, block, util, …): a short Amsterdam note in the natural hardfork/EIP place, linking that canonical section. If the package has no such note yet, add one there — same heading style (Amsterdam hardfork (experimental) or See the canonical Amsterdam overview…).
  • State which specs are implemented after this item (do not claim the whole fork is done).

Verify with local tests first, then the EST folders named in C1 (TEST_PATH=…/eipNNNN or TEST_CASE=). Use :summary for a broader check if useful.

API and docs rules (every C2)

• No breaking changes to existing exports / RunTxResult / constructor opts.
• New exports are OK when they help users (e.g. a helper already used internally).
• Do not rewrite unrelated README sections.

Do not

• Treat archived ethereum/execution-spec-tests as the release source.
• Import engine-x / benchmark / sync formats without a runner.
• Re-download a tarball that is already present and valid.
• Skip a phase gate or continue into the next phase in the same turn (including Phase A → B, report → Phase C, C1 → C2).
• Commit or push either repo unless the human explicitly asked for that step.
• Touch the monorepo submodule during Phase A.
• Assume EST runners have --jsontrace / --debug / --profile / --fork=HF+EIP.
• Dump or grep a full vitest default-reporter log when :summary + EST_SUMMARY_JSON exist.
• Mix “what’s new upstream” and “what we need” in the same bullets; dump first-round numbers as a markdown table in chat (use a canvas).
• Break existing public APIs to match a spec revision (add, don’t redefine).