Agent Native

ban-type-assertions

This skill enables the TypeScript ESLint rule that bans `as` type assertions in a package, replacing them with compiler-verified alternatives like Zod…

by FactoryOfficial publisherNot reviewed

Identity proven by GitHub's verified organisation badge (Factory-AI)

Agents
Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot, OpenCode, claude.ai and API
License
No license stated
Pin
7166a07pinned Oct 9, 2026
Context cost
about 1,600 tokenswhen the skill loads
GitHub stars
110on factory-ai/factory-plugins
Scripts
None found

What it does

“Ban `as` type assertions in a package via the `@typescript-eslint/consistent-type-assertions` lint rule, replacing them with compiler-verified type-safe alternatives. Use when enabling the assertion ban in a new package or fixing violations in an existing one.”
The author's description, from SKILL.md

Generated summary from the skill's own text

This skill enables the TypeScript ESLint rule that bans `as` type assertions in a package, replacing them with compiler-verified alternatives like Zod parsing, control flow narrowing, or type guards. It guides developers through a systematic workflow to identify violations and fix them using a tiered approach that prioritizes runtime validation over unverified casts.

When to use it

  • Adopting strict type safety in a new package with TypeScript
  • Enforcing compiler-verified types instead of developer assertions
  • Adding runtime validation at data boundaries like JSON parsing
  • Fixing existing type assertion violations systematically across a codebase

When not to

  • When library types genuinely cannot be inferred or narrowed
  • For projects that accept developer assertions as a reasonable tradeoff
  • If replacing assertions with equally unverified type guards

Install

No license stated: install from the publisher's repository, and ask the author before you reuse or share it.

These commands install from the publisher's repository and need no account.

skills CLI

npx skills add factory-ai/factory-plugins --skill ban-type-assertions

Installs from the repository's default branch, which may have changed since the commit we checked.

GitHub CLI 2.90 or later

gh skill install factory-ai/factory-plugins ban-type-assertions@7166a0799e3dd39184068160b9caaa1e6469028a

Installs the commit we checked (7166a07).

Copy by hand

Download the folder at 7166a07 and put it in .claude/skills/ban-type-assertions for Claude Code and in .agents/skills/ban-type-assertions for Codex, Cursor, Gemini CLI, GitHub Copilot and OpenCode.

Skill folder on GitHub at 7166a07

Copy for your agent

A prompt for any coding agent. It installs this skill from GitHub at the pinned commit, copies the files as they are, and runs nothing unless you ask.

Prompt

Install the agent skill "ban-type-assertions" by Factory.

Source, pinned to commit 7166a0799e3dd39184068160b9caaa1e6469028a:
https://github.com/factory-ai/factory-plugins/tree/7166a0799e3dd39184068160b9caaa1e6469028a/plugins/typescript/skills/ban-type-assertions

1. Download that folder at exactly this commit. Do not use the default branch.
2. Copy every file unchanged, keeping the folder structure, into .claude/skills/ban-type-assertions/ for Claude Code and .agents/skills/ban-type-assertions/ for Codex, Cursor, Gemini CLI, GitHub Copilot and OpenCode. Create the folders if they do not exist.
3. Do not edit the files, and do not run any script in the folder unless I ask you to.
4. When you are done, list the files you copied and where you put them.

Its license is restricted or not stated. Show me the license terms from the repository before you copy anything.

Listing and checks: https://www.agentnative.dev/skills/factory/ban-type-assertions

SKILL.md at the pin

The license of this skill does not let us show its files here.

View SKILL.md on GitHub at 7166a07

Files

1 file, 6.9 KB in total. Each file has a sha256 in the pin's manifest; the first 12 characters are shown.

Skill folder on GitHub at 7166a07
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The skills listed here are third-party software, collected from public GitHub repositories as a catalog of recent skills and provided as is. Agent Native does not write or control them and is not responsible for any harm, loss or damage caused by installing or using them. Labels and checks describe what we saw at one commit and are not a guarantee. Read a skill's files before you run it. Terms of use