agentmods.dev

effect-core-patterns

effect-core-patterns is a skill for Claude Code from TheBushidoCollective/han. It costs 41 tokens per session (3,695 once invoked), scanned A, original, no licence file.

Guidance for core patterns in Effect, a TypeScript library for describing successful, failed, synchronous, and asynchronous work.

In plain words
What is it for?
Use it when composing operations with Effect values, handling success or failure, wrapping synchronous work, or working with promises.
Why use it?
It helps organise operations and their possible results using Effect's standard building blocks.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Part of the effect plugin — 7 skills shipped together

not rated 200repo +1 yesterday A scan 41 tokens custom licence

Good fit Use it when composing operations with Effect values, handling success or failure, wrapping synchronous work, or working with promises.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/thebushidocollective/han/effect-core-patterns
View source ↗ TheBushidoCollective/han han.guru
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 TheBushidoCollective/han --skill effect-core-patterns
Clone the repo
git clone --depth 1 https://github.com/TheBushidoCollective/han

Made for: Claude Code.

Or install effect, the plugin that ships this one along with the rest of its 7 skills.

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-core-patterns

README.md
[![agentmods](https://agentmods.dev/badge/skills/thebushidocollective/han/effect-core-patterns/github.svg)](https://agentmods.dev/skills/thebushidocollective/han/effect-core-patterns)
Your own site
<a href="https://agentmods.dev/skills/thebushidocollective/han/effect-core-patterns"><img src="https://agentmods.dev/badge/skills/thebushidocollective/han/effect-core-patterns/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-core-patterns

Your own site · 80×15
<a href="https://agentmods.dev/skills/thebushidocollective/han/effect-core-patterns"><img src="https://agentmods.dev/badge/skills/thebushidocollective/han/effect-core-patterns.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 41 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,695 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown 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 $0.00041 $0.03695
Opus 5.5 $0.00016 $0.01478
Sonnet 5.5 $0.00008 $0.00739
Haiku 4.5 $0.00004 $0.00369

Measured 1mo ago against content hash c33056e3eceb, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

effect-core-patterns scanned grade A with 1 finding 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 1mo ago.

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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

Effect.promise(() => fetch(url))
plugins/frameworks/effect/skills/effect-core-patterns/SKILL.md · 629 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

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. 1mo ago First seen · 629 lines · 41 tokens per session scan A c33056e3eceb

Subscribe to this mod's changes

effect-core-patterns is a skill published in the GitHub repository TheBushidoCollective/han (200 stars, last pushed yesterday), with no licence file. It adds 41 tokens to every session and 3,695 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-08.

LanguagesTypeScript
Related

effect-core-patterns compared with skills from other repositories

effect-core-patterns next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
effect-core-patternsTheBushidoCollective/hanSkill200yesterdaynoneA41Claude Code
no-bare-castsprisma/ormSkill48ktodayApache-2.0A52Claude Code, Codex
aws-sst-developmentsickn33/agentic-awesome-skillsSkill49ktodayMITA26Claude Code
league-akari-shard-developmentLeagueAkari/LeagueAkariSkill4.7k5d agoMITA58Claude Code, Codex
dd-code-generationDataDog/pupSkill1.0kyesterdayApache-2.0A16Claude Code
fast-typescript-checkinternet-development/www-sacredSkill1.6k3d agoMITA84Claude Code, Codex
typescript-magicianmcollina/skillsSkill2.0k10d agoMITA108Claude Code, Codex