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Agent skill

Typescript Expert

by RightNow-AI in RightNow-AI/openfang

TypeScript expert for type system, generics, utility types, and strict mode patterns

Apache-2.0Auto-check passedDevelopment

Install Typescript Expert

skills CLI
$ npx skills add RightNow-AI/openfang --skill typescript-expert -a claude-code

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

GitHub CLI
$ gh skill install RightNow-AI/openfang typescript-expert --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/RightNow-AI/openfang.git skills-src && mkdir -p .claude/skills && cp -r skills-src/crates/openfang-skills/bundled/typescript-expert .claude/skills/typescript-expert && 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
typescript-expert
GitHub stars
18k
Token cost
~771 tokens
SKILL.md length
402 words
Files
1
Skills in repo
68
Repo updated
First seen
Licence
Apache-2.0

At a glance

TypeScript expert for type system, generics, utility types, and strict mode patterns

  • Tasks that involve Type safety
  • SKILL.md covers Key Principles, Techniques, Common Patterns and Pitfalls to Avoid
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Typescript Expert is an agent skill from RightNow-AI/openfang. TypeScript expert for type system, generics, utility types, and strict mode patterns

Its SKILL.md is about 770 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Development, covering Type safety. It works with TypeScript. The repository describes itself as: Open-source Agent Operating System. The licence is Apache-2.0.

When your agent uses it

  • Tasks that involve Type safety

Example prompts

  • “/typescript-expert”

What it can do on your machine

Read from SKILL.md and the folder at commit acf2587. 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.

    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

Typescript Expert loads about 771 tokens when it runs. Until then it costs about 26 tokens; SKILL.md has 402 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~26
When it runs · the whole SKILL.md, loaded when a task matches
~771

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 RightNow-AI/openfang at commit acf2587, republished under its Apache-2.0 licence (© RightNow-AI). 402 words, ~771 tokens.

Download SKILL.mdSave it as .claude/skills/typescript-expert/SKILL.md (or your agent's skills folder).
name
typescript-expert
description
TypeScript expert for type system, generics, utility types, and strict mode patterns

TypeScript Type System Mastery

You are an expert TypeScript developer with deep knowledge of the type system, advanced generics, conditional types, and strict mode configuration. You write code that maximizes type safety while remaining readable and maintainable. You understand how TypeScript's structural type system differs from nominal typing and leverage this to build flexible yet safe APIs.

Key Principles

  • Enable all strict mode flags: strict, noUncheckedIndexedAccess, exactOptionalPropertyTypes in tsconfig.json
  • Prefer type inference where it produces readable types; add explicit annotations at module boundaries and public APIs
  • Use discriminated unions over type assertions; the compiler should narrow types through control flow, not developer promises
  • Design generic functions with the fewest constraints that still ensure type safety
  • Treat any as a code smell; use unknown for truly unknown values and narrow with type guards

Techniques

  • Build generic constraints with extends: function merge<T extends object, U extends object>(a: T, b: U): T & U
  • Create mapped types for transformations: type Readonly<T> = { readonly [K in keyof T]: T[K] }
  • Apply conditional types for branching: type IsArray<T> = T extends any[] ? true : false
  • Use utility types effectively: Partial<T> for optional fields, Required<T> for mandatory, Pick<T, K> and Omit<T, K> for subsetting, Record<K, V> for dictionaries
  • Define discriminated unions with a literal type field: type Event = { type: "click"; x: number } | { type: "keydown"; key: string }
  • Write type guard functions: function isString(val: unknown): val is string { return typeof val === "string"; }
Show full SKILL.md (173 more words)Show less

Common Patterns

  • Branded Types: Create nominal types with type UserId = string & { readonly __brand: unique symbol } and a constructor function to prevent mixing semantically different strings
  • Builder with Generics: Track which fields have been set at the type level so that build() is only callable when all required fields are present
  • Exhaustive Switch: Use default: assertNever(x) with function assertNever(x: never): never to get compile errors when a union variant is not handled
  • Template Literal Types: Define route patterns like type Route = '/users/${string}/posts/${number}' for type-safe URL construction and parsing

Pitfalls to Avoid

  • Do not use as type assertions to silence errors; if the types do not match, fix the data flow rather than casting
  • Do not over-engineer generic types that require PhD-level type theory to understand; readability matters more than cleverness
  • Do not use enum for string constants; prefer as const objects or union literal types which have better tree-shaking and type inference
  • Do not rely on Object.keys() returning (keyof T)[]; TypeScript intentionally types it as string[] because objects can have extra properties at runtime

© RightNow-AI, Apache-2.0. 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 crates/openfang-skills/bundled/typescript-expert of RightNow-AI/openfang.

Open the folder on GitHubat commit acf2587

Compare with similar skills

Typescript Expert 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.

Typescript Expert compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Typescript Expert this skillRightNow-AI/openfang18k—~771Automated safety check: PassApache-2.0
Typescript Advanced Typesrolling-scopes/rsschool-app10k25 repos~4.2kAutomated safety check: PassMPL-2.0
Wagmi Feature Developmentwevm/wagmi6.8k—~3.8kAutomated safety check: PassMIT
Convert Internal Package to TypeScriptTryGhost/Ghost55k—~1.2kAutomated safety check: PassMIT
Add NodeBridge Handlerneovateai/neovate-code1.6k—~1kAutomated safety check: PassMIT
AST Visitor Pattern for Unionsprisma/orm48k—~830Automated safety check: PassApache-2.0

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Works with

Categories

Questions about Typescript Expert

What does Typescript Expert do?

TypeScript expert for type system, generics, utility types, and strict mode patterns. Typescript Expert is an agent skill from RightNow-AI/openfang.

When should I use Typescript Expert?

Typescript Expert fits situations like: tasks that involve Type safety.

How do I install Typescript Expert in Claude Code?

Run `npx skills add RightNow-AI/openfang --skill typescript-expert -a claude-code`. Or copy the skill folder (crates/openfang-skills/bundled/typescript-expert in RightNow-AI/openfang) into .claude/skills/typescript-expert in your project. Claude Code loads it when a task matches its description.

How do I install Typescript Expert in Codex?

Run `npx skills add RightNow-AI/openfang --skill typescript-expert -a codex`. Or copy the skill folder (crates/openfang-skills/bundled/typescript-expert in RightNow-AI/openfang) into .agents/skills/typescript-expert in your project. Codex loads it when a task matches its description.

Can I use Typescript Expert 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 RightNow-AI/openfang --skill typescript-expert -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/typescript-expert, .gemini/skills/typescript-expert, .github/skills/typescript-expert and .opencode/skills/typescript-expert in your project.

What does Typescript Expert need to run?

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

Does Typescript Expert 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 Typescript Expert 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 Typescript Expert use?

Typescript Expert is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Typescript Expert use?

About 771 tokens (SKILL.md is roughly 3.1k 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 Typescript Expert?

Skills that share tags, products or a category with Typescript Expert: Typescript Advanced Types (rolling-scopes/rsschool-app, 10k stars), Wagmi Feature Development (wevm/wagmi, 6.8k stars), Convert Internal Package to TypeScript (TryGhost/Ghost, 55k stars) and Add NodeBridge Handler (neovateai/neovate-code, 1.6k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Typescript Expert?

RightNow-AI (a GitHub organization) maintains it in RightNow-AI/openfang, which has 18,213 GitHub stars. The repository holds 68 skills in this directory. The repository was last updated on July 2, 2026.

Source: RightNow-AI/openfang on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.