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Agent skill

Fp Option Ref

by sickn33 in sickn33/agentic-awesome-skills

Quick reference for Option type. An agent skill from sickn33/agentic-awesome-skills.

MITAuto-check passed

Install Fp Option Ref

skills CLI
$ npx skills add sickn33/agentic-awesome-skills --skill fp-option-ref -a claude-code

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

GitHub CLI
$ gh skill install sickn33/agentic-awesome-skills fp-option-ref --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/sickn33/agentic-awesome-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/fp-option-ref .claude/skills/fp-option-ref && 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
fp-option-ref
GitHub stars
47k
Used in
2 other repos
Token cost
~604 tokens
SKILL.md length
115 words
Files
1
Skills in repo
1,493
Repo updated
First seen
Licence
MIT

At a glance

Quick reference for Option type. An agent skill from sickn33/agentic-awesome-skills.

  • User needs to handle nullable values
  • SKILL.md covers When to Use, Create, Transform and Extract, plus 3 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Wants to avoid null checks

What it does

Fp Option Ref is an agent skill from sickn33/agentic-awesome-skills. Quick reference for Option type. Use when user needs to handle nullable values, optional data, or wants to avoid null checks.

Its SKILL.md is about 600 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

The repository describes itself as: AAS Core is the local, agent-first control plane for complete catalog discovery, agent-owned selection, stack validation, and planning, backed by 2,400+ agentic skills. Includes… The licence is MIT.

When your agent uses it

  • User needs to handle nullable values
  • Wants to avoid null checks

Example prompts

  • “/fp-option-ref”

What it can do on your machine

Read from SKILL.md and the folder at commit 680176d. 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

    No scripts in the folder and no shell commands in SKILL.md (its code samples are typescript).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    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

Fp Option Ref loads about 604 tokens when it runs. Until then it costs about 35 tokens; SKILL.md has 115 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~35
When it runs · the whole SKILL.md, loaded when a task matches
~604

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

The full file from sickn33/agentic-awesome-skills at commit 680176d, republished under its MIT licence (© sickn33). 115 words, ~604 tokens.

Download SKILL.mdSave it as .claude/skills/fp-option-ref/SKILL.md (or your agent's skills folder).
name
fp-option-ref
description
Quick reference for Option type. Use when user needs to handle nullable values, optional data, or wants to avoid null checks.
risk
none
source
community
date_added
2026-09-04
version
1.0.0
tags
fp-ts, option, nullable, maybe, quick-reference

Option Quick Reference

Option = value that might not exist. Some(value) or None.

When to Use

  • You need a quick fp-ts reference for nullable or optional values.
  • The task involves eliminating null checks, safe property access, or optional chaining with Option.
  • You want a short reference card rather than a full migration guide.

Create

typescript
import * as O from 'fp-ts/Option'

O.some(5)              // Some(5)
O.none                 // None
O.fromNullable(x)      // null/undefined → None, else Some(x)
O.fromPredicate(x > 0)(x) // false → None, true → Some(x)

Transform

typescript
O.map(fn)              // Transform inner value
O.flatMap(fn)          // Chain Options (fn returns Option)
O.filter(predicate)    // None if predicate false

Extract

typescript
O.getOrElse(() => default)  // Get value or default
O.toNullable(opt)           // Back to T | null
O.toUndefined(opt)          // Back to T | undefined
O.match(onNone, onSome)     // Pattern match

Common Patterns

typescript
import { pipe } from 'fp-ts/function'
import * as O from 'fp-ts/Option'

// Safe property access
pipe(
  O.fromNullable(user),
  O.map(u => u.profile),
  O.flatMap(p => O.fromNullable(p.avatar)),
  O.getOrElse(() => '/default-avatar.png')
)

// Array first element
import * as A from 'fp-ts/Array'
pipe(
  users,
  A.head,  // Option<User>
  O.map(u => u.name),
  O.getOrElse(() => 'No users')
)

vs Nullable

typescript
// ❌ Nullable - easy to forget checks
const name = user?.profile?.name ?? 'Guest'

// ✅ Option - explicit, composable
pipe(
  O.fromNullable(user),
  O.flatMap(u => O.fromNullable(u.profile)),
  O.map(p => p.name),
  O.getOrElse(() => 'Guest')
)

Use Option when you need to chain operations on optional values.

Limitations

  • Use this skill only when the task clearly matches the scope described above.
  • Do not treat the output as a substitute for environment-specific validation, testing, or expert review.
  • Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.

© sickn33, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in skills/fp-option-ref of sickn33/agentic-awesome-skills.

Open the folder on GitHubat commit 680176d

Used in 2 other repositories

We found 11 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 2 other GitHub owners. This page covers the copy in sickn33/agentic-awesome-skills, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Fp Option Ref 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.

Fp Option Ref compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Fp Option Ref this skillsickn33/agentic-awesome-skills47k2 repos~604Automated safety check: PassMIT
Error Handlingaffaan-m/ECC276k1 repos~2.7kAutomated safety check: PassMIT
Optionsasgeirtj/system_prompts_leaks69k—~918Automated safety check: PassCC0-1.0
Error Handlingthedaviddias/Front-End-Checklist74k—~416Automated safety check: PassMIT
Error Handlingaffaan-m/ECC276k—~2.4kAutomated safety check: PassMIT
Python Error Handlingwshobson/agents40k—~1.5kAutomated safety check: PassMIT

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Questions about Fp Option Ref

What does Fp Option Ref do?

Quick reference for Option type. An agent skill from sickn33/agentic-awesome-skills. Fp Option Ref is an agent skill from sickn33/agentic-awesome-skills. Quick reference for Option type.

When should I use Fp Option Ref?

Fp Option Ref fits situations like: user needs to handle nullable values; wants to avoid null checks.

How do I install Fp Option Ref in Claude Code?

Run `npx skills add sickn33/agentic-awesome-skills --skill fp-option-ref -a claude-code`. Or copy the skill folder (skills/fp-option-ref in sickn33/agentic-awesome-skills) into .claude/skills/fp-option-ref in your project. Claude Code loads it when a task matches its description.

How do I install Fp Option Ref in Codex?

Run `npx skills add sickn33/agentic-awesome-skills --skill fp-option-ref -a codex`. Or copy the skill folder (skills/fp-option-ref in sickn33/agentic-awesome-skills) into .agents/skills/fp-option-ref in your project. Codex loads it when a task matches its description.

Can I use Fp Option Ref 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 sickn33/agentic-awesome-skills --skill fp-option-ref -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/fp-option-ref, .gemini/skills/fp-option-ref, .github/skills/fp-option-ref and .opencode/skills/fp-option-ref in your project.

What does Fp Option Ref need to run?

SKILL.md names no scripts, command-line tools or credentials: Fp Option Ref is instructions for the agent only.

Does Fp Option Ref access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Fp Option Ref 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 Fp Option Ref use?

Fp Option Ref is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Fp Option Ref use?

About 604 tokens (SKILL.md is roughly 2.4k 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 Fp Option Ref?

Skills that share tags, products or a category with Fp Option Ref: Error Handling (affaan-m/ECC, 276k stars), Options (asgeirtj/system_prompts_leaks, 69k stars), Error Handling (thedaviddias/Front-End-Checklist, 74k stars) and Error Handling (affaan-m/ECC, 276k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Fp Option Ref?

sickn33 (a GitHub user) maintains it in sickn33/agentic-awesome-skills, which has 47,379 GitHub stars. The repository holds 1,493 skills in this directory. The repository was last updated on October 9, 2026.

Source: sickn33/agentic-awesome-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.