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 agentmods add rules/zackiles/deno-kit/create-mcp-servergit clone --depth 1 https://github.com/zackiles/deno-kitWhat 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 | $0.00000 | $0.01368 |
| Opus 5 | $0.00000 | $0.00684 |
| Sonnet 5 | $0.00000 | $0.00274 |
| Haiku 4.5 | $0.00000 | $0.00137 |
Grade A, and why
create-mcp-server 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 yesterday.
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 create-mcp-server — 202 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 — 105 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Context
@modelcontextprotocol/sdk is an SDK for the Model Context Protocol. The full specifcation of the protocol can be found at https://raw.githubusercontent.com/modelcontextprotocol/specification/refs/heads/main/schema/draft/schema.json
Task
You'll write an MCP server given the available backend Javascript runtime available to you (e.g. Deno, Bun, Node) that supports invoking the server as either a stdio or WebSocket server using the native capabilities of the Javascript runtime available to you. using the native stdio and/or WebSocket available.
Mandatory Reading Before Starting
Understand the depdency @modelcontextprotocol/sdk by reading its README. Understand it's method, types and interfaces, and the two was in which it allows starting a server (the high level, and the lower level for finer control and configuration). Understand the various helper methods it provides. Understand its core components: Resources, Prompts, Tools, Notifications, Errors, Pagination, Completions.
Output
Follow any instructions already given to you and your understanding of the current codebase to generate code that solves the objective while maintaining coherence with the current codebase and any previous instructions. You've been provided an example below that is specific for the Deno runtime simply as an illustration and inspiration for your own design. When you're finished the code, create a task in the local package manager configuration that can run this server locally in a development mode.
Implementing Component Examples
NOTE: If you've been provided no instructions of what the first components should be to implement in the MCP server, than generate a very simple stubbed out example of each: Resource, Prompt, Tool, Notification, Error, Pagination, Completion. Please them in a seperate folder, and have them implemenet an abstract base class that is stubbed out with everything the interfaces and types of @modelcontextprotocol/sdk allows for each.
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.
- yesterday First seen · 105 lines · 0 tokens per session scan A 58c4e5145446
create-mcp-server is a cursor rule published in the GitHub repository zackiles/deno-kit (3 stars, last pushed 5mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,368 tokens. A static security scan graded it A with 0 findings. It is 100% identical to create-mcp-server, differing in 202 lines, and is treated as a copy.
Other cursor rules, from other repositories
development-conventions
Development conventions, code style, and best practices for the Kaneo project.
docs
This file provides guidelines for working with the documentation in the /docs directory.
architecture
Architecture of openapi-to-cli (ocli).
architecture-constraints
GolemBot architecture hard constraints — must check before modifying any src/ code.
app_feature_first_architecture
Feature-first architecture is a design pattern that organizes code by business features rather than technical layers. This approach promotes better maintainability, scalability, and team collaboration by keeping related functionality together and reducing coupling between different parts of the application.
best_practices
Advanced Best Practices covering Error Handling, Environment Variables, Performance, and Accessibility rules.