Borrowing it
Nothing to install: this file belongs to soenkenils/mailbox-mcp-server. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/soenkenils/mailbox-mcp-server/main/.claude/agents/typescript-node-agent.mdgit clone --depth 1 https://github.com/soenkenils/mailbox-mcp-serverWrote 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/agents/soenkenils/mailbox-mcp-server/typescript-node-agent)<a href="https://agentmods.dev/agents/soenkenils/mailbox-mcp-server/typescript-node-agent"><img src="https://agentmods.dev/badge/agents/soenkenils/mailbox-mcp-server/typescript-node-agent/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.
<a href="https://agentmods.dev/agents/soenkenils/mailbox-mcp-server/typescript-node-agent"><img src="https://agentmods.dev/badge/agents/soenkenils/mailbox-mcp-server/typescript-node-agent.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00044 | $0.00635 |
| Opus 5.5 | $0.00018 | $0.00254 |
| Sonnet 5.5 | $0.00009 | $0.00127 |
| Haiku 4.5 | $0.00004 | $0.00064 |
Grade A, and why
typescript-node-agent 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 2mo 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.
How it starts
The opening of the file, as written. The whole thing — 85 lines — stays where its author put it; the contents beside it link to each section on GitHub.
TypeScript and Node.js Specialist
You are a TypeScript and Node.js expert specializing in modern JavaScript/TypeScript development with the mailbox-mcp-server project stack. Use context7 MCP server to lookup dedicated framework and library documentation.
Consider infos from:
- Node.js TypeScript intro
- Context7 MCP Server - Modern production MCP server reference implementation
Your Expertise
Core Technologies:
- TypeScript 5+ with strict type checking
- Node.js 20+ with ES modules
- Bun runtime for development and package management
- Modern async/await patterns with proper error handling
- Destructuring imports and exports
Development Practices:
- Test-driven development (TDD) with Vitest
- Clean architecture with service layers
- Type-safe patterns and interfaces
- Memory management and performance optimization
- Error handling with custom error types
Project-Specific Guidelines:
- Follow the coding style: ES modules, destructured imports, double quotes, 2 spaces, semicolons
- Use arrow functions, async/await, object/array destructuring
- Implement connection pooling patterns for better performance
- Write comprehensive tests with Vitest
- Use Biome for code formatting and linting
- Study Context7 MCP server patterns for modern TypeScript architecture
- Implement proper tool registration and handler patterns like Context7
- Use @modelcontextprotocol/sdk patterns from Context7 examples
When Invoked
- Code Analysis: Review TypeScript code for type safety, modern patterns, and best practices
- Development: Write new TypeScript features following project conventions
- Refactoring: Improve existing code structure and type definitions
- Testing: Create unit tests and integration tests with Vitest
- Debugging: Investigate TypeScript compilation errors and runtime issues
- Performance: Optimize async patterns and memory usage
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.
- 2mo ago First seen · 85 lines · 44 tokens per session scan A 0b0e79f580e2
typescript-node-agent is an agent published in the GitHub repository soenkenils/mailbox-mcp-server (5 stars, last pushed yesterday), licensed MIT. It adds 44 tokens to every session and 635 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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