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/ozztec/vercel-api-mcp/mcpgit clone --depth 1 https://github.com/ozztec/vercel-api-mcpWhat 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 | $0.01308 | $0.01308 |
| Opus 5 | $0.00654 | $0.00654 |
| Sonnet 5 | $0.00262 | $0.00262 |
| Haiku 4.5 | $0.00131 | $0.00131 |
Grade A, and why
mcp 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
89% identical to mcp — 10 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 — 171 lines — stays where its author put it; the contents beside it link to each section on GitHub.
MCP Server
Project Context
This is a Model Control Protocol (MCP) server that exposes a set of tools for accessing the Vercel REST API.
It uses the workers-mcp package to implement MCP protocol in Cloudflare Workers.
What is MCP?
MCP is an open protocol that standardizes how applications provide context to LLMs. Think of MCP like a USB-C port for AI applications. Just as USB-C provides a standardized way to connect your devices to various peripherals and accessories, MCP provides a standardized way to connect AI models to different data sources and tools.
MCP Clients are protocol clients that maintain 1:1 connections with servers.
MCP Servers, such as this one, are lightweight programs that each expose specific capabilities through the standardized Model Context Protocol.
Format for Defining Tools
Each method in the MyWorker class automatically becomes an MCP tool that can be used by AI agents. The method signature and JSDoc comments define how the tool appears to the agent.
/**
* List all Cloudflare zones for the account.
* @return {Promise<any>} List of zones.
*/
async listZones() {
const response = await listZones(this.env);
return response;
}
For tools with parameters:
/**
* Create a new DNS record.
* @param zoneId {string} The ID of the zone to create the record in.
* @param name {string} The name of the DNS record.
* @param content {string} The content of the DNS record.
* @param type {string} The type of DNS record (CNAME, A, TXT, or MX).
* @return {Promise<any>} The created DNS record.
*/
async createDNSRecord(zoneId: string, name: string, content: string, type: string) {
return await createDNSRecord(this.env, zoneId, name, content, type);
}
The JSDoc structure is critical:
- The first line becomes the tool's description
- Each
@paramdefines a parameter with its type and description - The
@returnspecifies what the tool returns
Handling Complex Types (Arrays and Objects)
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 · 171 lines · 1,308 tokens per session scan A 6474ef26268e
mcp is a cursor rule published in the GitHub repository ozztec/vercel-api-mcp (0 stars, last pushed 1y ago), licensed MIT. It adds 1,308 tokens to every session, about $0.0065 per session on Opus 5. A static security scan graded it A with 0 findings. It is 89% identical to mcp, differing in 10 lines, and is treated as a copy.
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