How to use the TypeScript Advanced Types agent skill

What the skill makes the agent do

Once installed, the agent gets a reference guide on TypeScript's advanced type system. When you ask for complex typing, it can write generics, conditional types, mapped types, template literal types and utility types with clearer, more type-safe patterns.

The skill includes worked code examples and best-practice notes, such as preferring unknown over any, using discriminated unions and making readonly modifiers explicit. For deeper material it points to a longer companion file, references/details.md, which contains further patterns such as a type-safe event emitter.

Install the skill

You can install the skill in one of two ways. Download the ZIP from the skill's page on our site and unzip it into ~/.claude/skills/ to make it available across your projects, or unzip it into a project's .claude/skills/ folder to make it available only in that project.

If you use the Claude apps, you can instead upload the skill under Settings → Capabilities → Skills.

• Personal install: unzip into ~/.claude/skills/
• Project install: unzip into .claude/skills/ inside your project
• Claude apps: Settings → Capabilities → Skills, then upload

Trigger the skill with natural requests

You do not need a special command. The skill's description covers implementing complex type logic, creating reusable type utilities and ensuring compile-time type safety, so ask for those things in plain language and name the TypeScript features you want when you know them.

Mention your project context too. Saying you are building a library, migrating a JavaScript file or designing a typed API client helps the agent pick the relevant patterns.

• Write a generic function that returns the same type it receives and constrain it to objects with a length property.
• Create a type that makes every property of my Config interface readonly and optional.
• Build a template literal type that turns my event names into on-prefixed handler names.
• Migrate this JavaScript utility module to TypeScript with stricter types.

Examples of what the agent can produce

The skill covers the building blocks you would expect. For generics, it shows a constrained function such as logLength<T extends HasLength>, which rejects a number argument at compile time. For conditional types, it shows extracting a return type with infer, and distributive behaviour over unions.

For mapped types, it shows key remapping, for example building getter names like getName and getAge from an interface. For template literal types, it shows building dot-separated paths from a nested config object. For utility types, it lists the built-ins such as Partial, Pick, Omit, Exclude, Extract, NonNullable and Record, with a short example of each.

What the skill needs and how it runs

The skill lists no requirements. It does not run scripts and does not use the network. It is guidance only: it shapes the code the agent writes rather than running tools, so it does not check types for you.

Because the agent does not run your compiler through this skill, you still need to run tsc or your editor's type checker to confirm the results.

• Requires: nothing listed
• Runs scripts: no
• Uses network: no

Safety notes and limits

Since the skill runs no scripts and makes no network calls, the main risk is incorrect code, not system access. Review the types the agent produces and compile them.

The skill's type-testing section is incomplete in the file. It includes an AssertEqual helper and an ExpectError example, but do not rely on it to verify types automatically. Use your compiler and your own tests.

• Always run your TypeScript compiler after accepting agent changes
• Do not treat the skill's type tests as a complete verification suite
• The skill assumes familiarity with generics and type syntax

Tips for better results

Enable strict mode in your project, since the skill's best practices assume strict checking. Ask for the simplest type that meets your need, because the skill warns that overly complex types can slow compilation and that deep recursion should be limited.

If the first answer is too clever, ask the agent to simplify it or to explain the type in plain terms before you accept it.

• Turn on strict mode before asking for complex types
• Ask for simpler types when compile times grow
• Request JSDoc comments on complex types, which the skill recommends