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Type Safe Monkey Patching

Checked
marius-townhouse·vlatest·backend

This skill safely modifies code at runtime using monkey patching, preventing errors and enabling dynamic adjustments for testing or debugging.

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 type-safe-monkey-patching -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/type-safe-monkey-patching/SKILL.md
Scanned
1 file, 197 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 type-safe monkey patching in TypeScript. It allows you to modify existing classes or objects at runtime while maintaining type safety, preventing common errors associated with traditional monkey patching. The skill ensures that the modified object continues to adhere to its original interface and provides compile-time checks for compatibility.

When to use it

  • Hotfixing: Quickly apply temporary fixes to third-party libraries without modifying their source code directly.
  • Extending Functionality: Add new methods or properties to existing classes in a controlled and type-safe manner.
  • Testing & Mocking: Easily replace parts of a system with mock implementations for testing purposes, ensuring type correctness.
  • Compatibility Layers: Create compatibility layers between different versions of libraries or frameworks.

Key capabilities

  • Type-safe patching: Ensures modifications maintain type integrity.
  • Runtime modification: Allows altering objects and classes at runtime.
  • Compile-time checks: Provides error detection during development for patch compatibility.

Example prompts

  • "Patch the Array class to add a custom groupBy method."
  • "Modify the fetch function to include automatic retry logic, ensuring type safety."
  • “How can I monkey patch the console.log function to log messages with timestamps?”

Tips & gotchas

  • Requires a solid understanding of TypeScript's type system and class structures. Incorrect patching can still lead to runtime errors if types are not carefully considered.