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Use Readonly

Checked
marius-townhouse·vlatest·backend

This skill sets a variable to "readonly," preventing accidental modification and ensuring consistent data throughout your workflow.

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 use-readonly -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/use-readonly/SKILL.md
Scanned
1 file, 212 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

This skill enables the creation of readonly properties within TypeScript objects. It allows you to define object fields that cannot be modified after initialization, promoting immutability and data integrity. The skill leverages TypeScript's Readonly utility type to enforce this restriction at compile time.

When to use it

  • Configuration Objects: When defining configuration settings for an application where values should not change during runtime (e.g., API keys, database connection strings).
  • Immutable Data Structures: Building data structures that are inherently immutable, such as representing game state or financial transactions.
  • React State Management: Ensuring the immutability of props passed down to React components for predictable behavior and efficient re-renders.
  • Type Safety: Preventing accidental modification of critical object properties, leading to more robust code.

Key capabilities

  • Defines readonly properties on TypeScript objects.
  • Utilizes the Readonly utility type.
  • Enforces immutability at compile time.

Example prompts

  • "Create a configuration object with 'apiKey' and 'apiUrl' as readonly properties."
  • "Make all properties of this interface readonly."
  • "Define a function that returns an object with readonly fields."

Tips & gotchas

This skill requires familiarity with TypeScript syntax and the Readonly utility type. Attempting to modify a readonly property at runtime will result in a compile-time error, helping catch potential bugs early on.