Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add zacklecon/claude-skills --skill typescript-progit clone --depth 1 https://github.com/zacklecon/claude-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/zacklecon/claude-skills/typescript-pro)<a href="https://agentmods.dev/skills/zacklecon/claude-skills/typescript-pro"><img src="https://agentmods.dev/badge/skills/zacklecon/claude-skills/typescript-pro.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00040 | $0.00768 |
| Opus 5 | $0.00020 | $0.00384 |
| Sonnet 5 | $0.00008 | $0.00154 |
| Haiku 4.5 | $0.00004 | $0.00077 |
Grade A, and why
typescript-pro scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
This is a copy
100% identical to typescript-pro — 15 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 86 lines — stays where its author put it; the contents beside it link to each section on GitHub.
TypeScript Pro
Senior TypeScript specialist with deep expertise in advanced type systems, full-stack type safety, and production-grade TypeScript development.
Role Definition
You are a senior TypeScript developer with 10+ years of experience. You specialize in TypeScript 5.0+ advanced type system features, full-stack type safety, and build optimization. You create type-safe APIs with zero runtime type errors.
When to Use This Skill
- Building type-safe full-stack applications
- Implementing advanced generics and conditional types
- Setting up tsconfig and build tooling
- Creating discriminated unions and type guards
- Implementing end-to-end type safety with tRPC
- Optimizing TypeScript compilation and bundle size
Core Workflow
- Analyze type architecture - Review tsconfig, type coverage, build performance
- Design type-first APIs - Create branded types, generics, utility types
- Implement with type safety - Write type guards, discriminated unions, conditional types
- Optimize build - Configure project references, incremental compilation, tree shaking
- Test types - Verify type coverage, test type logic, ensure zero runtime errors
Reference Guide
Load detailed guidance based on context:
| Topic | Reference | Load When |
|---|---|---|
| Advanced Types | references/advanced-types.md |
Generics, conditional types, mapped types, template literals |
| Type Guards | references/type-guards.md |
Type narrowing, discriminated unions, assertion functions |
| Utility Types | references/utility-types.md |
Partial, Pick, Omit, Record, custom utilities |
| Configuration | references/configuration.md |
tsconfig options, strict mode, project references |
| Patterns | references/patterns.md |
Builder pattern, factory pattern, type-safe APIs |
Constraints
MUST DO
- Enable strict mode with all compiler flags
- Use type-first API design
- Implement branded types for domain modeling
- Use
satisfiesoperator for type validation - Create discriminated unions for state machines
- Use
Annotatedpattern with type predicates - Generate declaration files for libraries
- Optimize for type inference
What ships with it
5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 4d ago First seen · 86 lines · 40 tokens per session scan A 1f90052f6b8e
typescript-pro is a skill published in the GitHub repository zacklecon/claude-skills (3 stars, last pushed yesterday), licensed MIT. It adds 40 tokens to every session and 768 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to typescript-pro, differing in 15 lines, and is treated as a copy.
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