Borrowing it
Nothing to install: this file belongs to julioalberto64/iron-mcp-framework. 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/julioalberto64/iron-mcp-framework/main/.agents/skills/create-mcp-tool/SKILL.mdgit clone --depth 1 https://github.com/julioalberto64/iron-mcp-frameworkWrote 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/julioalberto64/iron-mcp-framework/create-mcp-tool)<a href="https://agentmods.dev/skills/julioalberto64/iron-mcp-framework/create-mcp-tool"><img src="https://agentmods.dev/badge/skills/julioalberto64/iron-mcp-framework/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/julioalberto64/iron-mcp-framework/create-mcp-tool"><img src="https://agentmods.dev/badge/skills/julioalberto64/iron-mcp-framework/create-mcp-tool.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 | $0.00069 | $0.01524 |
| Opus 5.5 | $0.00028 | $0.00610 |
| Sonnet 5.5 | $0.00014 | $0.00305 |
| Haiku 4.5 | $0.00007 | $0.00152 |
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 17d 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 — 55 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Crear una tool en IronMCP
Implementa la tool solicitada y deja el cambio validado. Las rutas src/, test/, examples/ y docs/ de esta guía son relativas a la raíz del repositorio. Da prioridad al código vigente si esta guía y el contrato difieren.
Ubicar el contrato
Lee src/framework/types.ts, src/framework/create-mcp-server.ts, src/tools/index.ts y una tool similar antes de editar. Para una integración REST, consulta también src/framework/rest/rest-client.ts. Usa references/example.md cuando necesites un ejemplo completo de tool, prueba y petición HTTP; adapta sus campos al endpoint real.
A partir del pedido y la documentación disponible, identifica nombre, propósito, entradas, operación, respuesta esperada y permisos. Si falta un dato que impida definir la integración, pide ese dato; no inventes endpoints ni campos del proveedor. Si la información alcanza, implementa sin detenerte en una propuesta.
Implementar e integrar
- Crea
src/tools/<nombre-kebab-case>.tool.tscon un nombre MCP único ensnake_caseydefineToolde../framework/types.js. Usa imports.jspara módulos locales eimport * as z from "zod/v4". - Define
name,title,description,inputSchema,outputSchema,timeoutMs,idempotent,auth,audityhandler.outputSchemaes opcional en TypeScript, pero es la convención para nuevas tools con salida estructurada. Los schemas de registro son shapes, noz.object(...); puedes compartir.shapecon los objetos usados para validar. - Declara
timeoutMscomo un literal entre 1 y 30000; el validador actual inspecciona texto. Describe con precisión si la operación consulta o cambia estado y defineidempotentsegún su comportamiento real, no solo por el verbo HTTP. - Valida dentro de
handler(input, context)con Zod antes de acceder a la API. Restringe formato y longitud según el dominio; codifica cada segmento dinámico conencodeURIComponenty construye las queries conURLSearchParams. - Para REST usa
context.restClient.geto.post. Este cliente está asociado alAbortSignalde la ejecución. No captures un cliente global ni crees otro cliente dentro de la tool. Si necesitas otro método HTTP que el cliente todavía no ofrece, extiéndelo con el cambio mínimo y sus pruebas; no simules el método ni eludas el cliente. - Fija la ruta según el propósito de la tool. No aceptes URLs completas ni rutas arbitrarias del usuario. El cliente admite únicamente rutas del origen configurado, bloquea redirecciones y limita las respuestas a 2 MiB.
- Valida las respuestas externas relevantes: los genéricos TypeScript no validan JSON. Devuelve un objeto acorde a
outputSchema, con los campos necesarios para el usuario. No incluyasraw, headers, tokens o datos personales ajenos al propósito por copiar otras tools. - El framework transforma el objeto devuelto en un resultado MCP; no construyas manualmente
contentniisErrordentro del handler. Propaga los fallos; usa los errores existentes desrc/framework/errors.tscuando aporten contexto seguro. - Registra la tool en el array devuelto por
createTools()ensrc/tools/index.ts, conservando las existentes. Una factory, si resulta útil, no debe capturar el RestClient: el handler lo obtiene del contexto.
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 17d ago First seen · 55 lines · 69 tokens per session scan A 5d535ef1dc6d
create-mcp-tool is a skill published in the GitHub repository julioalberto64/iron-mcp-framework (1 stars, last pushed 18d ago), licensed MIT. It adds 69 tokens to every session and 1,524 once invoked, about $0.0003 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 2026-10-20.
create-mcp-tool compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| create-mcp-tooljulioalberto64/iron-mcp-framework | Skill | 1 | 18d ago | MIT | A | 69 | Codex |
| mem0-oss-to-platformmem0ai/mem0 | Skill | 68k | 2d ago | Apache-2.0 | A | 217 | Claude Code, Codex |
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| dev-runtimelangwatch/langwatch | Skill | 5.0k | yesterday | Apache-2.0 | A | 172 | Claude Code |
| api-designericrisco/rsc-harness | Skill | 503 | 2d ago | MIT | A | 105 | Claude Code, Codex |
| migrate-segw-to-raparc-mcp/arc-1 | Skill | 252 | yesterday | MIT | A | 106 | Claude Code |