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 visa/ai --skill visa-best-practicesgit clone --depth 1 https://github.com/visa/aiWrote 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/visa/ai/visa-best-practices)<a href="https://agentmods.dev/skills/visa/ai/visa-best-practices"><img src="https://agentmods.dev/badge/skills/visa/ai/visa-best-practices/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/visa/ai/visa-best-practices"><img src="https://agentmods.dev/badge/skills/visa/ai/visa-best-practices.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 | $0.00092 | $0.00710 |
| Opus 5.5 | $0.00037 | $0.00284 |
| Sonnet 5.5 | $0.00018 | $0.00142 |
| Haiku 4.5 | $0.00009 | $0.00071 |
Grade A, and why
visa-best-practices 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 1mo 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 — 61 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Visa Developer Platform Integration Guide
Routing — What Are You Working On?
| If the user is asking about... | Read this reference |
|---|---|
| Authentication (X-Pay Token, Two-Way SSL, Mutual TLS) | references/vdp-integration.md |
| Message Level Encryption (MLE/JWE) | references/vdp-integration.md |
| Environment URLs (Sandbox, Cert, Production) | references/vdp-integration.md |
| Credential management & certificate rotation | references/vdp-integration.md |
| Code examples & starter kit (llms.txt) | references/vdp-integration.md |
| VIC workflows (card enrollment, purchase instructions) | references/visa-intelligent-commerce.md |
| VIC payment credentials & agent commerce | references/visa-intelligent-commerce.md |
| MPP card charge (HTTP 402, network tokens) | references/machine-payments-protocol.md |
| MPP Client/Server Enablers | references/machine-payments-protocol.md |
Quick Decision: Which Auth Method?
- X-Pay Token — Use for most integrations. Simpler setup, HMAC-based.
- Two-Way SSL (Mutual TLS) — Use when required by specific APIs or for higher-security environments.
Both are documented in references/vdp-integration.md.
Quick Decision: MCP vs Direct API?
- MCP-based — Building an AI agent or LLM-powered application? Use MCP (StreamableHTTP transport).
- Direct REST API — Traditional backend service? Use direct API calls with X-Pay auth + MLE.
Official Documentation Entry Points
| Resource | URL |
|---|---|
| Developer Center | https://developer.visa.com |
| VIC Capabilities | https://developer.visa.com/capabilities/visa-intelligent-commerce |
What ships with it
3 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.
- 1mo ago First seen · 61 lines · 92 tokens per session scan A 286b87baad73
visa-best-practices is a skill published in the GitHub repository visa/ai (45 stars, last pushed 27d ago), licensed MIT. It adds 92 tokens to every session and 710 once invoked, about $0.0004 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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