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effect-ts

effect-ts is a skill for Codex from PaulRBerg/agent-skills. It costs 70 tokens per session (1,542 once invoked), scanned A, original, MIT.

A development guide for Effect 3, a TypeScript library for programs with managed errors, configuration, concurrency, services, and data validation. It tells developers how to inspect the project's installed versions and choose matching patterns before changing code.

In plain words
What is it for?
Use it for nontrivial Effect 3 work involving services, layers, typed errors, schemas, configuration, concurrency, database access, AI integrations, or related tests.
Why use it?
Effect APIs and project conventions depend on the installed version and surrounding architecture. The guide reduces mistakes by requiring evidence from the project and focused verification.

Skill for Codex

Written for Codex: agents/openai.yaml present.

not rated 104repo +1 changed 6d ago A scan Socket: passSnyk: passSkillSpector: pass 70 tokens original MIT

Good fit Use it for nontrivial Effect 3 work involving services, layers, typed errors, schemas, configuration, concurrency, database access, AI integrations, or related tests.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/paulrberg/agent-skills/effect-ts
View source ↗ PaulRBerg/agent-skills
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add PaulRBerg/agent-skills --skill effect-ts
Clone the repo
git clone --depth 1 https://github.com/PaulRBerg/agent-skills

Made for: Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for effect-ts

README.md
[![agentmods](https://agentmods.dev/badge/skills/paulrberg/agent-skills/effect-ts/github.svg)](https://agentmods.dev/skills/paulrberg/agent-skills/effect-ts)
Your own site
<a href="https://agentmods.dev/skills/paulrberg/agent-skills/effect-ts"><img src="https://agentmods.dev/badge/skills/paulrberg/agent-skills/effect-ts/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for effect-ts

Your own site · 80×15
<a href="https://agentmods.dev/skills/paulrberg/agent-skills/effect-ts"><img src="https://agentmods.dev/badge/skills/paulrberg/agent-skills/effect-ts.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 70 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,542 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • Socket pass 27 Oct 2026
  • Snyk pass 27 Oct 2026
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00070 $0.01542
Opus 5.5 $0.00028 $0.00617
Sonnet 5.5 $0.00014 $0.00308
Haiku 4.5 $0.00007 $0.00154

Measured 6d ago against content hash 09ac0ae1e994, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

effect-ts scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 6d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/effect-source.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/effect-ts/SKILL.md · 101 lines

How it starts

The opening of the file, as written. The whole thing — 101 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Effect 4

Apply Effect 4 semantics from project-local architecture, the narrowest relevant reference, and source matching the target's installed packages.

Workflow

Do not activate this workflow merely because a file imports effect. For nontrivial Effect work:

  1. Resolve the target package or workspace and its exact installed effect and relevant @effect/* versions. If effect is not 4.x, stop because this skill does not apply. For 3.x, point the user to the v3 skill: npx skills add PaulRBerg/agent-skills#shelved --skill effect-ts-v3.
  2. Confirm lockstep versions: every @effect/* package must match the installed effect version exactly. Report a mismatch instead of coding around it.
  3. Inspect neighboring services, layers, errors, schemas, runtime boundaries, and tests. Local conventions decide organization. Installed package evidence decides API facts.
  4. Read references/critical-rules.md, then only the task-specific references below.
  5. Verify every uncertain import, signature, or behavior against the package installation visible to the target workspace before editing. Do not port v3 names from memory. Many were renamed or removed.
  6. Implement the smallest pattern consistent with the project and run the narrowest test or typecheck covering the changed semantics.

Evidence Order

Use the target workspace's manifest and lockfile to identify versions. Prefer, in order:

  1. the installed package's src/, README, tests, and changelog.
  2. its emitted declarations when source is not shipped.
  3. the matching official package artifact or source tag.

For monorepo source, tests, or cross-package search, run scripts/effect-source.sh. It keeps a cached clone of Effect-TS/effect checked out at the newest release, fetching at most once per 24 hours and otherwise reusing the cache, and prints path= and release=. When release differs from the installed effect version, read the matching tag without checking it out: git -C <path> grep <pattern> effect@<version> -- packages/ or git -C <path> show effect@<version>:<file>. Never edit the cache.

Read the full file on GitHub · 101 lines

Files

What ships with it

15 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 6d ago Changed · +2 lines 09ac0ae1e994
  2. 20d ago Changed · +5 lines a091e35cdfc6
  3. 1mo ago Changed · +16 lines · +14 tokens per session cb61cc923bb3
  4. 2mo ago First seen · 78 lines · 56 tokens per session scan A 1cc94ce5aa8b

Subscribe to this mod's changes

effect-ts is a skill published in the GitHub repository PaulRBerg/agent-skills (104 stars, last pushed 2d ago), licensed MIT. It adds 70 tokens to every session and 1,542 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

LanguagesTypeScriptagent-skillsai-agents
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