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Agent skill

Effect V3 To V4

by try-works in try-works/role-model

A skill your agent uses when migrating a codebase from Effect v3 to Effect v4, upgrading effect or any @effect/ package across the v3/v4 boundary.

Custom licenceAuto-check passedAgent Workflows

Install Effect V3 To V4

skills CLI
$ npx skills add try-works/role-model --skill effect-v3-to-v4 -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install try-works/role-model effect-v3-to-v4 --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/try-works/role-model.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/effect-v3-to-v4 .claude/skills/effect-v3-to-v4 && rm -rf skills-src

Use ~/.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/

Facts

Skill name
effect-v3-to-v4
GitHub stars
118
Used in
1 other repo
Token cost
~2k tokens
SKILL.md length
946 words
Files
2
Skills in repo
19
Repo updated
First seen
Licence
Custom licence

At a glance

A skill your agent uses when migrating a codebase from Effect v3 to Effect v4, upgrading effect or any @effect/ package across the v3/v4 boundary.

  • Works in 6 steps: Set up and validate the local checkouts… → Read MIGRATION.md and ls… → Migrate package.json — remove… → …
  • Migrating a codebase from Effect v3 to Effect v4
  • SKILL.md covers Workflow, Setup: Local Checkouts, Reading Order and Never Read the Reference Doc…, plus 4 more sections
  • Calls git, rg and tsc; reaches github.com

What it does

Effect V3 To V4 is an agent skill from try-works/role-model. Use this skill when migrating a codebase from Effect v3 to Effect v4, upgrading effect or any @effect/ package across the v3/v4 boundary.

Its SKILL.md is about 2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file (for example `PROVENANCE.md`).

It sits in Agent Workflows. The repository describes itself as: role-model is a protocol for assigning the right model for the right job. Use local and cloud AI together, or route between several cloud providers.

When your agent uses it

  • Migrating a codebase from Effect v3 to Effect v4
  • Upgrading effect
  • Any @effect/ package across the v3/v4 boundary

Example prompts

  • “/effect-v3-to-v4”

Workflow steps

6 steps, taken from the first numbered list in SKILL.md.

  1. Set up and validate the local checkouts — two shallow clones; verify any pre-existing .repos/effect before trusting it. See Setup: Local…
  2. Read MIGRATION.md and ls .repos/effect/migration/ for the background and guide index. See Reading Order.
  3. Migrate package.json — remove consolidated packages, align every remaining Effect package on one v4 version. Do this before type-checking…
  4. Run the project's type-check (e.g. tsc --noEmit) to get the initial error inventory.
  5. Iterate until the type-check is clean. For each error, resolve the API through the lookup discipline — search migration/v3-to-v4.md for…
  6. Finish — type-check clean; run tests and report their outcome honestly (not a gate); write the final summary. See Done Condition.

What it can do on your machine

Read from SKILL.md and the folder at commit de1c04a. 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:

    • git
    • rg
    • tsc
    • node

    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 V3 To V4 loads about 2k tokens when it runs. Until then it costs about 40 tokens; SKILL.md has 946 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~40
When it runs · the whole SKILL.md, loaded when a task matches
~2k

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

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 946 words (~1,959 tokens).

“Drive an Effect v3 → v4 migration from the generated migration reference that ships in the Effect repo. Every rename, removal, and signature change is answered by upstream data — do not guess replacements.”

— opening of SKILL.md by try-works, Custom licence
name
effect-v3-to-v4
disable-model-invocation
true

Read the full SKILL.md on GitHub

Files

SKILL.md and 1 other file in .agents/skills/effect-v3-to-v4 of try-works/role-model.

  • SKILL.md
  • PROVENANCE.md

Open the folder on GitHubat commit de1c04a

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in try-works/role-model, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Effect V3 To 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.

Effect V3 To V4 compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Effect V3 To V4 this skilltry-works/role-model1181 repos~2kAutomated safety check: PassCustom licence
MCP Server Builderanthropics/skills180k63 repos~2.3kAutomated safety check: PassApache-2.0
Hook Development for Claude Code Pluginsanthropics/claude-plugins-official38k10 repos~4.1kAutomated safety check: NotesApache-2.0
Using Superpowersfarm-fe/farm5.6k35 repos~1.4kAutomated safety check: PassMIT
Executing Plans Inlineobra/superpowers297k2 repos~5.1kAutomated safety check: PassMIT
Skill CreatorAzure/azqr79589 repos~8.2kAutomated safety check: PassApache-2.0

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Categories

Questions about Effect V3 To V4

What does Effect V3 To V4 do?

A skill your agent uses when migrating a codebase from Effect v3 to Effect v4, upgrading effect or any @effect/ package across the v3/v4 boundary. Effect V3 To V4 is an agent skill from try-works/role-model. Use this skill when migrating a codebase from Effect v3 to Effect v4, upgrading effect or any @effect/ package across the v3/v4 boundary.

When should I use Effect V3 To V4?

Effect V3 To V4 fits situations like: migrating a codebase from Effect v3 to Effect v4; upgrading effect; any @effect/ package across the v3/v4 boundary.

How do I install Effect V3 To V4 in Claude Code?

Run `npx skills add try-works/role-model --skill effect-v3-to-v4 -a claude-code`. Or copy the skill folder (.agents/skills/effect-v3-to-v4 in try-works/role-model) into .claude/skills/effect-v3-to-v4 in your project. Claude Code loads it when a task matches its description.

How do I install Effect V3 To V4 in Codex?

Run `npx skills add try-works/role-model --skill effect-v3-to-v4 -a codex`. Or copy the skill folder (.agents/skills/effect-v3-to-v4 in try-works/role-model) into .agents/skills/effect-v3-to-v4 in your project. Codex loads it when a task matches its description.

Can I use Effect V3 To 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 try-works/role-model --skill effect-v3-to-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-v3-to-v4, .gemini/skills/effect-v3-to-v4, .github/skills/effect-v3-to-v4 and .opencode/skills/effect-v3-to-v4 in your project.

What does Effect V3 To V4 need to run?

Going by SKILL.md and its folder, Effect V3 To V4 needs the command-line tools its instructions call (git, rg, tsc and node).

Does Effect V3 To 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 V3 To 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 V3 To V4 use?

Effect V3 To V4 has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Effect V3 To V4 use?

About 2k tokens (SKILL.md is roughly 7.8k 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 V3 To V4?

Skills that share tags, products or a category with Effect V3 To V4: MCP Server Builder (anthropics/skills, 180k stars), Hook Development for Claude Code Plugins (anthropics/claude-plugins-official, 38k stars), Using Superpowers (farm-fe/farm, 5.6k stars) and Executing Plans Inline (obra/superpowers, 297k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Effect V3 To V4?

try-works (a GitHub user) maintains it in try-works/role-model, which has 118 GitHub stars. The repository holds 19 skills in this directory. The repository was last updated on October 7, 2026.

Source: try-works/role-model on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.