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Tagged Unions

Checked
marius-townhouse·vlatest·backend

This skill creates complex, named relationships between tokens, streamlining data organization and enhancing semantic understanding for your AI projects.

Repository

Install on your platform

Showing Claude Code. One command installs this skill into any of the agents below.

  1. 1

    Run this in your project

    terminal
    $ npx skills add marius-townhouse/effective-typescript-skills --skill tagged-unions -a claude-code

  2. Uses the open-source skills CLI and needs Node.js. Add -g to install it for your user instead of this project.

What we know about this skill

Publisher

marius-townhouse

Taken from the source listing. We haven't verified who controls this account.

Install target

Live repository

Not pinned. Installing fetches whatever the repository holds at the time you run the command.

No human has reviewed this code. The checks below are a static scan of the files at one commit — nobody has run this skill or judged whether it works. A skill runs with whatever access you give your agent, so read the source before you install it.

Automated safety checks

scanned

This skill passed all 6 checks. We read its files at one commit and looked for the things that make a skill dangerous to run — not for whether it works.

  • Declares what it does: passed

    SKILL.md parses and declares a name and a description.

    SKILL.md exists, its frontmatter parses, and it declares a name and a description.

  • No undeclared network calls: passed

    Makes no network calls.

    Every host the skill dials — from its scripts, its config endpoints or the commands it tells the agent to run — is either well-known package and API infrastructure or declared in its own frontmatter. Links in documentation are not counted.

  • No obfuscated payloads: passed

    No encoded or obfuscated payloads.

    No base64, hex or compressed blob is decoded and then executed, and no encoded shell commands.

  • No credential access: passed

    Reads no keys, tokens, keychains or credential files.

    Neither the code nor the SKILL.md instructions read SSH keys, cloud credentials, keychains, token stores, browser cookie databases or dotfiles that hold secrets.

  • No pipe-to-shell installers: passed

    No pipe-to-shell or download-and-run installers.

    No `curl … | sh` pattern, in the code or in the instructions, that runs code fetched at run time.

  • Pinned to a commit: passed

    Scanned marius-townhouse/effective-typescript-skills at d754db2077.

    The exact upstream commit SHA that was scanned is recorded, so the result refers to specific bytes.

Commit
d754db2077
Manifest
skills/tagged-unions/SKILL.md
Scanned
1 file, 293 lines
This is a static scan, not a review. It reads the skill's files; it does not run them, and it cannot tell you whether the skill is any good or whether the code does what its description says. A skill runs with whatever access you give your agent.
What each check looks for →

About this skill

What it does

The tagged-unions skill allows AI agents to understand and generate TypeScript code that utilizes tagged unions. Tagged unions, also known as discriminated unions, are a powerful type system feature in TypeScript enabling more robust and type-safe handling of different data types within a single variable. This skill enables the agent to reason about and produce code leveraging this pattern for improved clarity and error prevention.

When to use it

  • Handling Variant Data: When an AI agent needs to process data that can be one of several distinct, typed forms (e.g., success/failure responses from an API).
  • Type-Safe State Management: For creating state machines or complex component logic where the type of state changes dynamically.
  • Improving Code Readability: When refactoring existing code to make it more understandable and maintainable by leveraging tagged unions for clearer data representation.
  • Generating Data Structures: To create custom data structures that represent a union of different types, ensuring type safety during operations.

Key capabilities

  • Understanding tagged union syntax in TypeScript.
  • Generating code utilizing discriminated unions.
  • Reasoning about the benefits of using tagged unions for type safety.
  • Applying tagged unions to various scenarios (e.g., API responses, state management).

Example prompts

  • "Generate a TypeScript function that handles either a 'Success' or 'Error' result using a tagged union."
  • "Show me how to implement a simple state machine in TypeScript with tagged unions."
  • “Write a type for an API response which can be either a User object or an ErrorMessage object.”

Tips & gotchas

This skill assumes basic familiarity with TypeScript syntax and concepts. While tagged unions improve type safety, they can increase code complexity if overused; consider the trade-offs when applying this pattern.