Review PR
apache/shardingsphere
Review Apache ShardingSphere or user-authorized downstream pull requests and PR discussions from public or authorized repository evidence.
A skill your agent uses when writing, debugging, or reviewing Effect-TS v4 (4.0.0-beta) code in this repo — resolving an Effect API, verifying a signature/error shape, or finding idiomatic usage.
Install Effect V4
$ npx skills add backpine/effect-worker-mono --skill effect-v4 -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install backpine/effect-worker-mono effect-v4 --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/backpine/effect-worker-mono.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/effect-v4 .claude/skills/effect-v4 && 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 "effect-v4" agent skill from https://github.com/backpine/effect-worker-mono/tree/main/.claude/skills/effect-v4 into .claude/skills/effect-v4/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "effect-v4", 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/backpine/effect-worker-mono/tree/main/.claude/skills/effect-v4Type 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 backpine/effect-worker-mono --skill effect-v4 -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install backpine/effect-worker-mono effect-v4 --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/backpine/effect-worker-mono.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/effect-v4 .agents/skills/effect-v4 && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "effect-v4" agent skill from https://github.com/backpine/effect-worker-mono/tree/main/.claude/skills/effect-v4 into .agents/skills/effect-v4/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "effect-v4", 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 backpine/effect-worker-mono --skill effect-v4 -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install backpine/effect-worker-mono effect-v4 --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/backpine/effect-worker-mono.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/effect-v4 .cursor/skills/effect-v4 && 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 "effect-v4" agent skill from https://github.com/backpine/effect-worker-mono/tree/main/.claude/skills/effect-v4 into .cursor/skills/effect-v4/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "effect-v4", 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/backpine/effect-worker-mono.git --path .claude/skills/effect-v4--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 backpine/effect-worker-mono --skill effect-v4 -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install backpine/effect-worker-mono effect-v4 --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/backpine/effect-worker-mono.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/effect-v4 .gemini/skills/effect-v4 && 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 "effect-v4" agent skill from https://github.com/backpine/effect-worker-mono/tree/main/.claude/skills/effect-v4 into .gemini/skills/effect-v4/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "effect-v4", 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 backpine/effect-worker-mono effect-v4Installs 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 backpine/effect-worker-mono --skill effect-v4 -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/backpine/effect-worker-mono.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/effect-v4 .github/skills/effect-v4 && 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 "effect-v4" agent skill from https://github.com/backpine/effect-worker-mono/tree/main/.claude/skills/effect-v4 into .github/skills/effect-v4/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "effect-v4", 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 backpine/effect-worker-mono --skill effect-v4 -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install backpine/effect-worker-mono effect-v4 --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/backpine/effect-worker-mono.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/effect-v4 .opencode/skills/effect-v4 && 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 "effect-v4" agent skill from https://github.com/backpine/effect-worker-mono/tree/main/.claude/skills/effect-v4 into .opencode/skills/effect-v4/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "effect-v4", 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.
Facts
- Skill name
effect-v4- GitHub stars
- 132
- Token cost
- ~937 tokens
- SKILL.md length
- 368 words
- Files
- 1
- Skills in repo
- 2
- Repo updated
- First seen
- Licence
- MIT
At a glance
A skill your agent uses when writing, debugging, or reviewing Effect-TS v4 (4.0.0-beta) code in this repo — resolving an Effect API, verifying a signature/error shape, or finding idiomatic usage.
- Reviewing Effect-TS v4 (4.0.0-beta) code in this repo — resolving an Effect API
- SKILL.md covers Golden rule, Where things live, How to use it and Hard rules, plus 1 more section
- Calls git and rg; reaches github.com
- Verifying a signature/error shape
What it does
Effect V4 is an agent skill from backpine/effect-worker-mono. Use when writing, debugging, or reviewing Effect-TS v4 (4.0.0-beta) code in this repo — resolving an Effect API, verifying a signature/error shape, or finding idiomatic usage. v4 is a fast-moving beta whose web docs are outdated; this skill points you at the vendored Effect source (repos/effect) so you read real implementations instead of guessing or applying stale v3 patterns. Trigger on any uncertainty about an effect import, module, type, or effect/unstable/ API.
Its SKILL.md is about 940 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. It works with SQL. The licence is MIT.
When your agent uses it
- Reviewing Effect-TS v4 (4.0.0-beta) code in this repo — resolving an Effect API
- Verifying a signature/error shape
- Finding idiomatic usage
- Any uncertainty about an effect import
Example prompts
- “/effect-v4”
What it can do on your machine
Read from SKILL.md and the folder at commit c1a6559. It shows what the files ask for, not the result of running them.
Tool permissions
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.
Runs code
Shell commands in SKILL.md call:
gitrg
From the folder's file list and the shell code blocks in SKILL.md.
Network
Hosts in commands or code, which the agent is likely to contact:
github.com
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Effect V4 loads about 937 tokens when it runs. Until then it costs about 121 tokens; SKILL.md has 368 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.
Safety
Auto-check passed
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.
SKILL.md
The full file from backpine/effect-worker-mono at commit c1a6559, republished under its MIT licence (© backpine). 368 words, ~937 tokens.
Download SKILL.mdSave it as
.claude/skills/effect-v4/SKILL.md (or your agent's skills folder).- name
- effect-v4
- description
- Use when writing, debugging, or reviewing Effect-TS v4 (4.0.0-beta) code in this repo — resolving an Effect API, verifying a signature/error shape, or finding idiomatic usage. v4 is a fast-moving beta whose web docs are outdated; this skill points you at the vendored Effect source (repos/effect) so you read real implementations instead of guessing or applying stale v3 patterns. Trigger on any uncertainty about an `effect` import, module, type, or `effect/unstable/*` API.
Effect v4 source reference
This repo runs Effect v4 (4.0.0-beta.70). Public docs lag the real APIs, and v3
patterns frequently do not apply. The complete Effect v4 source is vendored at
repos/effect (a git subtree of Effect-TS/effect-smol, the v4 dev repo,
pinned to the effect@4.0.0-beta.70 tag — it matches the installed version exactly).
v4 lives in effect-smol, NOT Effect-TS/effect (still v3). Treat it as the
authoritative reference — read it instead of guessing or trusting web search.
Golden rule
Don't assume — read the source. If you are about to write an Effect v4 API call
and you are not 100% certain of its current shape, look it up in repos/effect first.
The cost of a grep is far lower than the cost of a wrong v3-flavored guess.
Where things live
All under repos/effect/packages/effect/src/. Module name maps 1:1 to the import:
| Import | Source |
|---|---|
effect (e.g. Context, Effect, Layer, Schema, Data, DateTime) | src/<Module>.ts |
effect/unstable/http | src/unstable/http/ |
effect/unstable/httpapi | src/unstable/httpapi/ |
effect/unstable/rpc | src/unstable/rpc/ |
effect/unstable/sql | src/unstable/sql/ |
effect/unstable/reactivity (Atom) | src/unstable/reactivity/ |
@effect/sql-pg and @effect/atom-react live under repos/effect/packages/.
How to use it
- Resolve / verify an API: open
repos/effect/packages/effect/src/<Module>.tsand read the exporteddeclare const/ class / interface. Grep for the symbol:rg "export (declare const|class|interface) <Name>" repos/effect/packages/effect/src - Find idiomatic usage: search tests and examples —
rg "<api>" repos/effect/packages/effect/test repos/effect/packages/effect/examples - Confirm an error/option shape before constructing it (constructors changed a lot between betas).
Show full SKILL.md (150 more words)Show less
Hard rules
repos/effectis read-only reference material. Never edit it, never import from it, never copy its files intopackages/orapps/.- App/package code depends on the published
effectpackage via thepnpm-workspace.yamlcatalog — not the vendored tree. - It's excluded from search/auto-import/watching (
.vscode/settings.json) and from the pnpm / tsc / vitest workspaces, so it won't interfere with builds. - To refresh it:
git subtree pull --prefix=repos/effect https://github.com/Effect-TS/effect-smol.git effect@4.0.0-beta.70 --squash(re-pin the tag to whatever version the catalog uses; usemainfor the latest)
Known v4 deltas (verify against source if in doubt)
ServiceMap→Context: the module was renamed back toContext. UseContext.Service<Self, Shape>()("Id"),Context.Reference<T>("Id", { defaultValue }),Context.make(key, value),Context.add,Context.get.SqlErrorwraps a structured reason:new SqlError.SqlError({ reason: new SqlError.UnknownError({ cause }) })(thecausefield is now derived, not a constructor arg).- Service keys are yieldable directly:
const db = yield* Database(noFiberRef.get). - See
CLAUDE.md→ "Effect v4 — Vendored Source Reference" for the project-level summary.
© backpine, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in .claude/skills/effect-v4 of backpine/effect-worker-mono.
Open the folder on GitHubat commit c1a6559
Compare with similar skills
Effect V4 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 |
|---|---|---|---|---|---|---|
| Effect V4 this skillbackpine/effect-worker-mono | 132 | — | ~937 | Automated safety check: Pass | MIT | |
| Review PRapache/shardingsphere | 21k | — | ~6.4k | Automated safety check: Pass | Apache-2.0 | |
| Coding Standardsapache/shardingsphere | 21k | — | ~2.2k | Automated safety check: Pass | Apache-2.0 | |
| SeekDB Code Reviewoceanbase/seekdb | 3.1k | — | ~2.1k | Automated safety check: Pass | Apache-2.0 | |
| Code Nest Project Specxiaou61/Code-Nest | 770 | — | ~1.3k | Automated safety check: Pass | MIT | |
| Mariadb Operator Commentmariadb-operator/mariadb-operator | 1k | — | ~2.2k | Automated safety check: Pass | Apache-2.0 |
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Questions about Effect V4
What does Effect V4 do?
A skill your agent uses when writing, debugging, or reviewing Effect-TS v4 (4.0.0-beta) code in this repo — resolving an Effect API, verifying a signature/error shape, or finding idiomatic usage. Effect V4 is an agent skill from backpine/effect-worker-mono.0-beta) code in this repo — resolving an Effect API, verifying a signature/error shape, or finding idiomatic usage.
When should I use Effect V4?
Effect V4 fits situations like: reviewing Effect-TS v4 (4.0.0-beta) code in this repo — resolving an Effect API; verifying a signature/error shape; finding idiomatic usage; any uncertainty about an effect import.
How do I install Effect V4 in Claude Code?
Run `npx skills add backpine/effect-worker-mono --skill effect-v4 -a claude-code`. Or copy the skill folder (.claude/skills/effect-v4 in backpine/effect-worker-mono) into .claude/skills/effect-v4 in your project. Claude Code loads it when a task matches its description.
How do I install Effect V4 in Codex?
Run `npx skills add backpine/effect-worker-mono --skill effect-v4 -a codex`. Or copy the skill folder (.claude/skills/effect-v4 in backpine/effect-worker-mono) into .agents/skills/effect-v4 in your project. Codex loads it when a task matches its description.
Can I use Effect V4 in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add backpine/effect-worker-mono --skill effect-v4 -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/effect-v4, .gemini/skills/effect-v4, .github/skills/effect-v4 and .opencode/skills/effect-v4 in your project.
What does Effect V4 need to run?
Going by SKILL.md and its folder, Effect V4 needs the command-line tools its instructions call (git and rg).
Does Effect V4 access the network?
SKILL.md names 1 domain. In commands or code: github.com; the agent is likely to contact it when it follows the instructions. This is read from the text; nothing was executed.
Is Effect V4 safe to install?
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.
What licence does Effect V4 use?
Effect V4 is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Effect V4 use?
About 937 tokens (SKILL.md is roughly 3.7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Effect V4?
Skills that share tags, products or a category with Effect V4: Review PR (apache/shardingsphere, 21k stars), Coding Standards (apache/shardingsphere, 21k stars), SeekDB Code Review (oceanbase/seekdb, 3.1k stars) and Code Nest Project Spec (xiaou61/Code-Nest, 770 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Effect V4?
backpine (a GitHub organization) maintains it in backpine/effect-worker-mono, which has 132 GitHub stars. The repository holds 2 skills in this directory. The repository was last updated on May 26, 2026.
Source: backpine/effect-worker-mono on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.