fp-types-ref

fp-types-ref is a skill for Claude Code, Codex from whatiskadudoing/fp-ts-skills. It costs 35 tokens per session (493 once invoked), scanned A, original, no licence file.

A quick reference for choosing types and imports in fp-ts, a TypeScript library for functional programming. It covers Option, Either, and TaskEither.

In plain words
What is it for?
Choosing between optional values, typed errors, and asynchronous operations that may fail. Finding the fp-ts imports needed for an implementation.
Why use it?
It helps developers decide which fp-ts type fits a situation without searching through documentation. It also reduces uncertainty about the correct imports.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

Good fit Choosing between optional values, typed errors, and asynchronous operations that may fail. Finding the fp-ts imports needed for an implementation.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/whatiskadudoing/fp-ts-skills/fp-types-ref
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 whatiskadudoing/fp-ts-skills --skill fp-types-ref
Clone the repo
git clone --depth 1 https://github.com/whatiskadudoing/fp-ts-skills

Made for: Claude Code, 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 fp-types-ref

README.md
[![agentmods](https://agentmods.dev/badge/skills/whatiskadudoing/fp-ts-skills/fp-types-ref/github.svg)](https://agentmods.dev/skills/whatiskadudoing/fp-ts-skills/fp-types-ref)
Your own site
<a href="https://agentmods.dev/skills/whatiskadudoing/fp-ts-skills/fp-types-ref"><img src="https://agentmods.dev/badge/skills/whatiskadudoing/fp-ts-skills/fp-types-ref/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 fp-types-ref

Your own site · 80×15
<a href="https://agentmods.dev/skills/whatiskadudoing/fp-ts-skills/fp-types-ref"><img src="https://agentmods.dev/badge/skills/whatiskadudoing/fp-ts-skills/fp-types-ref.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 35 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 493 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 $0.00035 $0.00493
Opus 5.5 $0.00014 $0.00197
Sonnet 5.5 $0.00007 $0.00099
Haiku 4.5 $0.00003 $0.00049

Measured 2mo ago against content hash ecb77c4acd08, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

fp-types-ref 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 2mo 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.

| Wrap async | `TE.tryCatch(() => fetch(url), toError)` |
skills/quick-ref/fp-types-ref/SKILL.md · 67 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. 2mo ago First seen · 67 lines · 35 tokens per session scan A ecb77c4acd08

Subscribe to this mod's changes

fp-types-ref is a skill published in the GitHub repository whatiskadudoing/fp-ts-skills (14 stars, last pushed 9mo ago), with no licence file. It adds 35 tokens to every session and 493 once invoked, about $0.0001 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 2026-08-30.

Related

fp-types-ref compared with skills from other repositories

fp-types-ref next to 6 skills from other repositories
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build-audit-logsHugoRCD/evlogSkill1.9k5d agoMITA49Claude Code, Codex
adkmajiayu000/claude-skill-registrySkill729todayMITA0Claude Code, Codex
typescript-patternssoftspark/ai-toolkitSkill1792d agoApache-2.0A42Claude Code
programmingnotque/vexjoy-agentSkill4493d agoMITA20Claude Code