effect-portable-patterns

A set of Effect-TS patterns for running asynchronous work as ordinary JavaScript Promises. It covers concerns such as time limits, retries, errors, caching, parallel work, matching values, and tracing.

In plain words
What is it for?
Use it when adding timeouts or retries, defining typed errors, caching results, controlling concurrent work, matching outcomes, or tracing asynchronous operations.
Why use it?
It helps keep asynchronous code consistent when operations can fail, take too long, or need to run together. The final result can still be used as a normal Promise.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/millionco/expect/effect-portable-patterns
Any agent
npx skills add millionco/expect --skill effect-portable-patterns
Clone the repo
git clone --depth 1 https://github.com/millionco/expect

Made for: Claude Code, Codex.

Per session 51 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,451 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
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 $0.00051 $0.03451
Opus 5 $0.00026 $0.01725
Sonnet 5 $0.00010 $0.00690
Haiku 4.5 $0.00005 $0.00345

Measured 2d ago against content hash 7f3f61078a76, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

effect-portable-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 2d 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.

try: () => fetch(url),
.agents/skills/effect-portable-patterns/SKILL.md · 478 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

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. 2d ago First seen · 478 lines · 51 tokens per session scan A 7f3f61078a76

Subscribe to this mod's changes

effect-portable-patterns is a skill published in the GitHub repository millionco/expect (3,552 stars, last pushed 3mo ago), with no licence file. It adds 51 tokens to every session and 3,451 once invoked, about $0.0003 per session on Opus 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 2026-08-30.

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