Updates EthereumJS execution-spec test fixtures from an ethereum/execution-specs release, then (after a human merge) points the monorepo submodule, updates VM npm scripts, reports a first test run…
$ npx skills add ethereumjs/ethereumjs-monorepo --skill update-est-fixtures -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install ethereumjs/ethereumjs-monorepo update-est-fixtures --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/ethereumjs/ethereumjs-monorepo.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.cursor/skills/update-est-fixtures .claude/skills/update-est-fixtures && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "update-est-fixtures" agent skill from https://github.com/ethereumjs/ethereumjs-monorepo/tree/master/.cursor/skills/update-est-fixtures into .claude/skills/update-est-fixtures/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "update-est-fixtures", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/ethereumjs/ethereumjs-monorepo/tree/master/.cursor/skills/update-est-fixturesType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add ethereumjs/ethereumjs-monorepo --skill update-est-fixtures -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install ethereumjs/ethereumjs-monorepo update-est-fixtures --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ethereumjs/ethereumjs-monorepo.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.cursor/skills/update-est-fixtures .agents/skills/update-est-fixtures && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "update-est-fixtures" agent skill from https://github.com/ethereumjs/ethereumjs-monorepo/tree/master/.cursor/skills/update-est-fixtures into .agents/skills/update-est-fixtures/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "update-est-fixtures", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add ethereumjs/ethereumjs-monorepo --skill update-est-fixtures -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install ethereumjs/ethereumjs-monorepo update-est-fixtures --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ethereumjs/ethereumjs-monorepo.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.cursor/skills/update-est-fixtures .cursor/skills/update-est-fixtures && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "update-est-fixtures" agent skill from https://github.com/ethereumjs/ethereumjs-monorepo/tree/master/.cursor/skills/update-est-fixtures into .cursor/skills/update-est-fixtures/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "update-est-fixtures", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/ethereumjs/ethereumjs-monorepo.git --path .cursor/skills/update-est-fixtures--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add ethereumjs/ethereumjs-monorepo --skill update-est-fixtures -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install ethereumjs/ethereumjs-monorepo update-est-fixtures --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ethereumjs/ethereumjs-monorepo.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.cursor/skills/update-est-fixtures .gemini/skills/update-est-fixtures && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "update-est-fixtures" agent skill from https://github.com/ethereumjs/ethereumjs-monorepo/tree/master/.cursor/skills/update-est-fixtures into .gemini/skills/update-est-fixtures/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "update-est-fixtures", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install ethereumjs/ethereumjs-monorepo update-est-fixturesInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add ethereumjs/ethereumjs-monorepo --skill update-est-fixtures -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/ethereumjs/ethereumjs-monorepo.git skills-src && mkdir -p .github/skills && cp -r skills-src/.cursor/skills/update-est-fixtures .github/skills/update-est-fixtures && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "update-est-fixtures" agent skill from https://github.com/ethereumjs/ethereumjs-monorepo/tree/master/.cursor/skills/update-est-fixtures into .github/skills/update-est-fixtures/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "update-est-fixtures", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add ethereumjs/ethereumjs-monorepo --skill update-est-fixtures -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install ethereumjs/ethereumjs-monorepo update-est-fixtures --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ethereumjs/ethereumjs-monorepo.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.cursor/skills/update-est-fixtures .opencode/skills/update-est-fixtures && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "update-est-fixtures" agent skill from https://github.com/ethereumjs/ethereumjs-monorepo/tree/master/.cursor/skills/update-est-fixtures into .opencode/skills/update-est-fixtures/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "update-est-fixtures", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
update-est-fixturesUpdates EthereumJS execution-spec test fixtures from an ethereum/execution-specs release, then (after a human merge) points the monorepo submodule, updates VM npm scripts, reports a first test run…
Update Est Fixtures is an agent skill from ethereumjs/ethereumjs-monorepo. Updates EthereumJS execution-spec test fixtures from an ethereum/execution-specs release, then (after a human merge) points the monorepo submodule, updates VM npm scripts, reports a first test run, and implements ordered “what we need” items in two gated steps each. Use when the user asks to update EST, EELS, or execution-spec tests/fixtures, bump a fixture release, integrate a fixtures-repo change into the monorepo, or implement a “what we need” / Amsterdam spec-delta item from a first-round report.
Its SKILL.md is about 3.3k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Development, covering Monorepo tooling and Test data and fixtures. It works with Ethereum, npm, JavaScript and TypeScript. The repository describes itself as: Ethereum L1 Protocol Stack and EVM in TypeScript.
6 steps, taken from the first numbered list in SKILL.md.
Read from SKILL.md and the folder at commit a2ee933. It shows what the files ask for, not the result of running them.
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Shell commands in SKILL.md call:
gitFrom the folder's file list and the shell code blocks in SKILL.md.
No URLs in SKILL.md. Its commands use git, which can reach the network depending on how they are called.
From URLs in SKILL.md, links to its own repository left out.
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Update Est Fixtures loads about 3.3k tokens when it runs. Until then it costs about 131 tokens; SKILL.md has 1,563 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
Without a licence we can't republish the file, so here is its outline and opening line. It has 1,563 words (~3,257 tokens).
“Source of truth: packages/vm/DEVELOPER.md — Updating fixtures and What “green” means. Read that before changing files.”
Just SKILL.md in .cursor/skills/update-est-fixtures of ethereumjs/ethereumjs-monorepo.
Open the folder on GitHubat commit a2ee933
Update Est Fixtures next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Update Est Fixtures this skillethereumjs/ethereumjs-monorepo | 2.8k | — | ~3.3k | Automated safety check: Pass | None | |
| Linea Dependency MaintenanceConsensys-Incorporated/linea-attestation-registry | 177 | 1 repos | ~3.7k | Automated safety check: Warn | MIT | |
| Install Anti-Slop Oxlint Rulesdmmulroy/anti-slop | 5.4k | — | ~2.2k | Automated safety check: Pass | MIT | |
| Link Workspace Packagesnomcopter/react-mosaic | 4.8k | 6 repos | ~760 | Automated safety check: Pass | Custom licence | |
| Pnpm Engineteambit/bit | 18k | — | ~1.9k | Automated safety check: Pass | Custom licence | |
| Building And VerifyingNangoHQ/nango | 13k | — | ~902 | Automated safety check: Pass | Custom licence |
Consensys-Incorporated/linea-attestation-registry
Safely plan and execute dependency maintenance for JavaScript/TypeScript (npm, pnpm) and GitHub Actions, including npm lockfiles, pnpm workspaces, catalogs, overrides, SHA-pinned action versions…
dmmulroy/anti-slop
Installs, updates or migrates the vendored anti-slop Oxlint plugin in a repository, keeping local rule changes and the plugin's license and provenance files.
nomcopter/react-mosaic
Link workspace packages in monorepos (npm, yarn, pnpm, bun).
teambit/bit
Work on the pnpm Rust engine (@pnpm/napi, the pacquet crates) that bit install runs through.
NangoHQ/nango
A skill your agent uses when building the Nango monorepo or verifying TypeScript compilation - covers build commands, project references, common tsc errors, and package dependency order
starknet-io/starknet.js
A skill your agent uses when writing or debugging JavaScript/TypeScript that interacts with Starknet through the starknet.js SDK — building Call objects or calldata, encoding/decoding Cairo types…
ethereumjs/ethereumjs-monorepo
Runs a coordinated EthereumJS npm release round in six human-gated phases — intent and readiness, CHANGELOG, version bump, publish (human executes), post-publish verification, and announcements.
Works with
Categories
Updates EthereumJS execution-spec test fixtures from an ethereum/execution-specs release, then (after a human merge) points the monorepo submodule, updates VM npm scripts, reports a first test run…. Update Est Fixtures is an agent skill from ethereumjs/ethereumjs-monorepo. Updates EthereumJS execution-spec test fixtures from an ethereum/execution-specs release, then (after a human merge) points the monorepo submodule, updates VM npm scripts, reports a first test run, and implements ordered “what we need” items in two gated steps each.
Update Est Fixtures fits situations like: the user asks to update EST; execution-spec tests/fixtures; bump a fixture release; integrate a fixtures-repo change into the monorepo.
Run `npx skills add ethereumjs/ethereumjs-monorepo --skill update-est-fixtures -a claude-code`. Or copy the skill folder (.cursor/skills/update-est-fixtures in ethereumjs/ethereumjs-monorepo) into .claude/skills/update-est-fixtures in your project. Claude Code loads it when a task matches its description.
Run `npx skills add ethereumjs/ethereumjs-monorepo --skill update-est-fixtures -a codex`. Or copy the skill folder (.cursor/skills/update-est-fixtures in ethereumjs/ethereumjs-monorepo) into .agents/skills/update-est-fixtures in your project. Codex loads it when a task matches its description.
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add ethereumjs/ethereumjs-monorepo --skill update-est-fixtures -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/update-est-fixtures, .gemini/skills/update-est-fixtures, .github/skills/update-est-fixtures and .opencode/skills/update-est-fixtures in your project.
Going by SKILL.md and its folder, Update Est Fixtures needs the command-line tools its instructions call (git).
SKILL.md contains no URLs. Its commands use git, which can reach the network depending on how they are called. This is read from the text; nothing was executed.
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
No licence was found for Update Est Fixtures or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
About 3.3k tokens (SKILL.md is roughly 13k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
Skills that share tags, products or a category with Update Est Fixtures: Linea Dependency Maintenance (Consensys-Incorporated/linea-attestation-registry, 177 stars), Install Anti-Slop Oxlint Rules (dmmulroy/anti-slop, 5.4k stars), Link Workspace Packages (nomcopter/react-mosaic, 4.8k stars) and Pnpm Engine (teambit/bit, 18k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
ethereumjs (a GitHub organization) maintains it in ethereumjs/ethereumjs-monorepo, which has 2,759 GitHub stars. The repository holds 2 skills in this directory. The repository was last updated on September 18, 2026.
Source: ethereumjs/ethereumjs-monorepo on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.
