Add mercadopago-agent-toolkit example

[naza00000]

Description

Adds a new solutions/mercadopago-agent-toolkit/ example: a Next.js app where an agent drives Mercado Pago billing flows (Subscriptions, Payments, Refunds, Cuotas) via @ar-agents/mercadopago, Vercel AI SDK 6, and the AI Gateway.

The agent picks the right tool from a natural-language prompt:

• Cobrale $25.000 mensual a juan@example.com con razón Plan Pro. routes to create_subscription.
• Buscá pagos de los últimos 30 días por más de $5.000. routes to search_payments.
• Reembolsame el último pago de juan@example.com. confirms then calls refund_payment.

Vercel-native bits used:

• AI Gateway routes the LLM call by string model name (anthropic/claude-sonnet-4-6), so the Anthropic key never touches the client bundle.
• Edge Runtime on /api/agent: the package is Web-Crypto based.
• The package ships @ar-agents/mercadopago/vercel-kv (subscription state, OAuth tokens, idempotency cache, audit log, distributed rate limiter) and @ar-agents/mercadopago/otel (OpenTelemetry instrumentation) as subpath exports.

Demo URL

https://ar-agents.vercel.app (the live landing has a "Try it with a live agent" panel that runs the same code path against mocked MP tools).

Type of Change

• New Example
• Example updates (Bug fixes, new features, etc.)
• Other (changes to the codebase, but not to examples)

New Example Checklist

• 🛫 npm run new-example was used to create the example
• 📚 The template wasn't used but I carefully read Adding a new example and followed the structure (.gitignore, package.json with MIT license, README.md with front matter metadata + deployUrl + demoUrl, .env.example)
• 📱 Responsive (single-column chat, no fixed widths)
• License is MIT
• Front matter metadata included so the example can be featured on vercel.com/templates

Notes for reviewers

• The package handles 89 typed tools across the agent-relevant Mercado Pago surface; this example only exercises a subset to keep the demo small. The full surface is documented at packages/mercadopago/AGENTS.md.
• The cookbook with 9 production recipes lives at packages/mercadopago/cookbook.
• Open source, MIT, no Vercel dependency injected: the example just uses the published npm package.

[vercel]

@naza00000 is attempting to deploy a commit to the Vercel Examples Team on Vercel.

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[vercel]

Deployment failed with the following error:

The `vercel.ts` schema validation failed with the following message: `rewrites[0]` missing required property `destination`

Learn More: https://vercel.com/docs/concepts/projects/project-configuration

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	npm/​@​ar-agents/​mercadopago@​0.15.2

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