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 nickytonline/mcp-typescript-template --skill create-mcp-toolgit clone --depth 1 https://github.com/nickytonline/mcp-typescript-templateWrote 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/nickytonline/mcp-typescript-template/create-mcp-tool)<a href="https://agentmods.dev/skills/nickytonline/mcp-typescript-template/create-mcp-tool"><img src="https://agentmods.dev/badge/skills/nickytonline/mcp-typescript-template/create-mcp-tool/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/skills/nickytonline/mcp-typescript-template/create-mcp-tool"><img src="https://agentmods.dev/badge/skills/nickytonline/mcp-typescript-template/create-mcp-tool.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00043 | $0.03136 |
| Opus 5.5 | $0.00017 | $0.01254 |
| Sonnet 5.5 | $0.00009 | $0.00627 |
| Haiku 4.5 | $0.00004 | $0.00314 |
Grade A, and why
create-mcp-tool 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 15d 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 — 294 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Add an MCP Tool to This Template
This skill walks you through adding a new tool to the MCP server. If you need to reference MCP SDK types, capabilities, or advanced patterns not covered here, use the context7 MCP server or WebFetch to look up the @modelcontextprotocol/server documentation.
Template Conventions
| Concern | Location |
|---|---|
| Tool registration | src/tools.ts inside registerTools(server) via server.registerTool() |
| Tool logic | src/tools.ts — functions that take only the dependencies they need |
| Response formatting | createTextResult() / createErrorResult() from src/lib/utils.ts |
| Input validation | Effect Schema adapted with toMcpSchema() |
| Typed output | outputSchema + structuredContent (emitted automatically by createTextResult) |
| Tests | src/tools.test.ts (colocated with src/tools.ts) |
Everything for a tool lives in src/tools.ts. registerTools(server) is the single source of truth for tool wiring — it's called from getServer() in src/app.ts and reused by the tests, so registration can never drift from what's tested. Each tool's implementation is an Effect workflow that takes the arguments and ctx it uses, which keeps it small and easy to drive through every branch. Return runMcpEffect(effect) only at the MCP callback boundary. Use Effect.all with explicit concurrency for independent parallel work; keep Effect.tryPromise at Promise-based API boundaries. app.ts owns HTTP routing via createMcpHandler, while index.ts owns startup and shutdown; per the MCP 2026-07-28 spec there's no session: getServer() runs fresh for every request.
Step 1: Name the Tool
Tool names should use snake_case — this is the prevailing community convention (e.g. get_user, search_documents, list_items). The MCP spec (SEP-986) allows a-z, A-Z, 0-9, _, -, ., and /, but does not mandate a style. Names must be 1–64 characters and unique within the server.
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.
- 15d ago Changed d4ca7598d510
- 29d ago Changed · -3 lines 097fd3cf0972
- 1mo ago Changed · +29 lines 3ff455071a4e
- 2mo ago First seen · 268 lines · 43 tokens per session scan A 6fdba688192d
create-mcp-tool is a skill published in the GitHub repository nickytonline/mcp-typescript-template (60 stars, last pushed 3d ago), licensed MIT. It adds 43 tokens to every session and 3,136 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 2026-08-30.
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