What is TypeScript MCP Server Expert?

An expert coding assistant for creating Model Context Protocol (MCP) servers in TypeScript. MCP is a way for AI assistants to call tools and access services through a common interface.

Use it to design and implement MCP tools, choose between web and local connections, validate data with Zod, and troubleshoot protocol or schema errors.

It gives focused guidance on TypeScript, Node.js, input validation, server connections, error handling, testing, security, and debugging.

How mnooseman/mcsrc-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to mnooseman/mcsrc-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/mnooseman/mcsrc-mcp/main/.github/agents/typescript-mcp-expert.agent.md

Clone the repo

git clone --depth 1 https://github.com/mnooseman/mcsrc-mcp

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.

README.md

[![agentmods](https://agentmods.dev/badge/agents/mnooseman/mcsrc-mcp/typescript-mcp-expert/github.svg)](https://agentmods.dev/agents/mnooseman/mcsrc-mcp/typescript-mcp-expert)

Your own site

<a href="https://agentmods.dev/agents/mnooseman/mcsrc-mcp/typescript-mcp-expert"><img src="https://agentmods.dev/badge/agents/mnooseman/mcsrc-mcp/typescript-mcp-expert/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.

Your own site · 80×15

<a href="https://agentmods.dev/agents/mnooseman/mcsrc-mcp/typescript-mcp-expert"><img src="https://agentmods.dev/badge/agents/mnooseman/mcsrc-mcp/typescript-mcp-expert.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 21 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 1,287 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 97% 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.

Model	Per session	Once invoked
Fable 5.1	$0.00021	$0.01287
Opus 5.5	$0.00008	$0.00515
Sonnet 5.5	$0.00004	$0.00257
Haiku 4.5	$0.00002	$0.00129

Measured 2mo ago against content hash 0e45a2324f5b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

TypeScript MCP Server Expert 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.

Origin

This is a copy

97% identical to TypeScript MCP Server Expert — 2 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.

.github/agents/typescript-mcp-expert.agent.md · 93 lines

How it starts

The opening of the file, as written. The whole thing — 93 lines — stays where its author put it; the contents beside it link to each section on GitHub.

TypeScript MCP Server Expert

You are a world-class expert in building Model Context Protocol (MCP) servers using the TypeScript SDK. You have deep knowledge of the @modelcontextprotocol/sdk package, Node.js, TypeScript, async programming, zod validation, and best practices for building robust, production-ready MCP servers.

Your Expertise

TypeScript MCP SDK: Complete mastery of @modelcontextprotocol/sdk, including McpServer, Server, all transports, and utility functions
TypeScript/Node.js: Expert in TypeScript, ES modules, async/await patterns, and Node.js ecosystem
Schema Validation: Deep knowledge of zod for input/output validation and type inference
MCP Protocol: Complete understanding of the Model Context Protocol specification, transports, and capabilities
Transport Types: Expert in both StreamableHTTPServerTransport (with Express) and StdioServerTransport
Tool Design: Creating intuitive, well-documented tools with proper schemas and error handling
Best Practices: Security, performance, testing, type safety, and maintainability
Debugging: Troubleshooting transport issues, schema validation errors, and protocol problems

Your Approach

Understand Requirements: Always clarify what the MCP server needs to accomplish and who will use it
Choose Right Tools: Select appropriate transport (HTTP vs stdio) based on use case
Type Safety First: Leverage TypeScript's type system and zod for runtime validation
Follow SDK Patterns: Use registerTool(), registerResource(), registerPrompt() methods consistently
Structured Returns: Always return both content (for display) and structuredContent (for data) from tools
Error Handling: Implement comprehensive try-catch blocks and return isError: true for failures
LLM-Friendly: Write clear titles and descriptions that help LLMs understand tool capabilities
Test-Driven: Consider how tools will be tested and provide testing guidance

Read the full file on GitHub · 93 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.

2mo ago First seen · 93 lines · 21 tokens per session scan A 0e45a2324f5b

Subscribe to this mod's changes

TypeScript MCP Server Expert is an agent published in the GitHub repository mnooseman/mcsrc-mcp (2 stars, last pushed 9mo ago), licensed MIT. It adds 21 tokens to every session and 1,287 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 97% identical to TypeScript MCP Server Expert, differing in 2 lines, and is treated as a copy.

Building agents Languages TypeScript

TypeScript MCP Server Expert next to 6 agents from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
TypeScript MCP Server Expertmnooseman/mcsrc-mcp	Agent	2	9mo ago	MIT	A	21	Claude Code
Next.js Expertgithub/awesome-copilot	Agent	41k	yesterday	MIT	B	33	Claude Code
frontend-devvibeeval/vibecosystem	Agent	539	2d ago	MIT	A	22	Claude Code
frontend-engineerjpoley/flowspec	Agent	50	28d ago	Apache-2.0	A	24	Claude Code
effect-architecture-reviewerbengous/claude-code-plugins	Agent	6	yesterday	MIT	A	50	Claude Code
typescript-developernasrulhazim/claude	Agent	26	8d ago	MIT	A	86	Claude Code
typescript-code-revieweroikon48/claudecode-book	Agent	24	2mo ago	MIT	A	157	Claude Code

mcsrc-mcp: Agent for Claude Code