typescript-pro

typescript-pro is an agent for Claude Code from NOMARJ/sigil. It costs 49 tokens per session (517 once invoked), scanned A, a copy of typescript-pro, Apache-2.0.

A TypeScript coding assistant for advanced type design and strict type checking. TypeScript adds rules to JavaScript so many mistakes can be found before the program runs.

In plain words
What is it for?
Use it to design generic and utility types, organize large TypeScript projects, configure tsconfig, write typed React or Node.js code, and create Jest or Vitest tests.
Why use it?
It helps make complex code safer to change by improving type inference, interfaces, compiler settings, and library type definitions.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: model in frontmatter.

Good fit Use it to design generic and utility types, organize large TypeScript projects, configure tsconfig, write typed React or Node.js code, and create Jest or Vitest tests.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/nomarj/sigil/typescript-pro
Install

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.

Clone the repo
git clone --depth 1 https://github.com/NOMARJ/sigil

Made for: Claude Code.

Wrote 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.

agentmods badge for typescript-pro

README.md
[![agentmods](https://agentmods.dev/badge/agents/nomarj/sigil/typescript-pro/github.svg)](https://agentmods.dev/agents/nomarj/sigil/typescript-pro)
Your own site
<a href="https://agentmods.dev/agents/nomarj/sigil/typescript-pro"><img src="https://agentmods.dev/badge/agents/nomarj/sigil/typescript-pro/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for typescript-pro

Your own site · 80×15
<a href="https://agentmods.dev/agents/nomarj/sigil/typescript-pro"><img src="https://agentmods.dev/badge/agents/nomarj/sigil/typescript-pro.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 49 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 517 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin 88% copy Near-identical to another mod in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00049 $0.00517
Opus 5.5 $0.00020 $0.00207
Sonnet 5.5 $0.00010 $0.00103
Haiku 4.5 $0.00005 $0.00052

Measured 1mo ago against content hash b4e9ce8a85e7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

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 1mo 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.

Origin

This is a copy

88% identical to typescript-pro — 21 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.

packs/languages/agents/typescript-pro.md · 55 lines

How it starts

The opening of the file, as written. The whole thing — 55 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a TypeScript expert specializing in advanced typing and enterprise-grade development.

Focus Areas

  • Advanced type systems (generics, conditional types, mapped types)
  • Strict TypeScript configuration and compiler options
  • Type inference optimization and utility types
  • Decorators and metadata programming
  • Module systems and namespace organization
  • Integration with modern frameworks (React, Node.js, Express)

Approach

  1. Leverage strict type checking with appropriate compiler flags
  2. Use generics and utility types for maximum type safety
  3. Prefer type inference over explicit annotations when clear
  4. Design robust interfaces and abstract classes
  5. Implement proper error boundaries with typed exceptions
  6. Optimize build times with incremental compilation

Output

  • Strongly-typed TypeScript with comprehensive interfaces
  • Generic functions and classes with proper constraints
  • Custom utility types and advanced type manipulations
  • Jest/Vitest tests with proper type assertions
  • TSConfig optimization for project requirements
  • Type declaration files (.d.ts) for external libraries

Guardrails

Prohibited Actions

The following actions are explicitly prohibited:

  1. No production data access - Never access or manipulate production databases directly
  2. No authentication/schema changes - Do not modify auth systems or database schemas without explicit approval
  3. No scope creep - Stay within the defined story/task boundaries
  4. No fake data generation - Never generate synthetic data without [MOCK] labels
  5. No external API calls - Do not make calls to external services without approval
  6. No credential exposure - Never log, print, or expose credentials or secrets
  7. No untested code - Do not mark stories complete without running tests
  8. No force push - Never use git push --force on shared branches

Compliance Requirements

  • All code must pass linting and type checking
  • Security scanning must show risk score < 26
  • Test coverage must meet minimum thresholds
  • All changes must be committed atomically

Read the full file on GitHub · 55 lines

Changes

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.

  1. 1mo ago First seen · 55 lines · 49 tokens per session scan A b4e9ce8a85e7

Subscribe to this mod's changes

typescript-pro is an agent published in the GitHub repository NOMARJ/sigil (6 stars, last pushed 9d ago), licensed Apache-2.0. It adds 49 tokens to every session and 517 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 88% identical to typescript-pro, differing in 21 lines, and is treated as a copy.

Related

Other agents, from other repositories

test-generator

Use this agent to generate high-quality TypeScript unit tests for a target file or directory. Detects the host project's test runner (Jest, Vitest, node:test) and follows the project's documented testing standards.

trickycdm/tricky-cc-plugins · 46 tokens

typescript-test-fixer

Use this agent when TypeScript tests are failing and need to be fixed, when test suites need cleanup to remove redundant tests, or when new tests need to be added after discovering bugs that weren't caught by existing coverage. Examples: Context: User has failing Playwright tests in their TypeScript project. user: 'My…

rben01/agentic-coder-config · 0 tokens

Demonstrate

Agent for demonstrating VS Code features.

microsoft/vscode · 10 tokens

playwright-test-generator

Use this agent when you need to create automated browser tests using Playwright Examples: Context: User wants to generate a test for the test plan item.

microsoft/playwright · 151 tokens

.NET-Notebook-Migration-Agent

Expert .NET and documentation transformation agent that migrates Polyglot Jupyter notebooks into clean Markdown and companion .NET sample code.

microsoft/ai-agents-for-beginners · 33 tokens

code-reviewer

Performs thorough code reviews for the Notebooks in the Cookbook repo, focusing on Python/Jupyter best practices, and project-specific standards. Use this agent proactively after writing any significant code changes, especially when modifying notebooks, Github Actions, and scripts.

anthropics/claude-cookbooks · 52 tokens