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 goshippo/ai --skill shippo-best-practicesgit clone --depth 1 https://github.com/goshippo/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/goshippo/ai/shippo-best-practices)<a href="https://agentmods.dev/skills/goshippo/ai/shippo-best-practices"><img src="https://agentmods.dev/badge/skills/goshippo/ai/shippo-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/goshippo/ai/shippo-best-practices"><img src="https://agentmods.dev/badge/skills/goshippo/ai/shippo-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 | $0.00101 | $0.01368 |
| Opus 5 | $0.00051 | $0.00684 |
| Sonnet 5 | $0.00020 | $0.00274 |
| Haiku 4.5 | $0.00010 | $0.00137 |
Grade A, and why
shippo-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 11d 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 — 82 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Latest Shippo API version: 2018-02-08. Send via the Shippo-API-Version header.
Using the Shippo MCP
The hosted Shippo MCP at https://mcp.shippo.com exposes exactly 4 tools (a meta-API), not the underlying operations directly:
shippo_list_tools: discover which operation you need.shippo_describe_tool: get that operation's input schema.shippo_read_execute_tool: run a read (lists, gets, lookups).shippo_write_execute_tool: run a write or mutation (creates, purchases, voids).
Every operation name in this skill (ValidateAddress, CreateShipment, CreateTransaction, GetTrack, etc.) is invoked through these wrappers, never called as a tool on its own. Standard discovery pattern: shippo_list_tools to find the operation, then shippo_describe_tool for its schema, then shippo_read_execute_tool or shippo_write_execute_tool to run it. The read/write split lets approval policies gate mutations separately. In the Claude apps these 4 tools may be deferred (loaded on demand), so an initial "tool has not been loaded yet" is normal: discover via the wrappers rather than guessing operation names.
Integration routing
| Building… | Recommended primitive | See |
|---|---|---|
| Checkout flow with live shipping rates | Rates at Checkout | Rate Shopping (+ shippo/references/rate-shopping-guide.md) |
| Single label purchase | Shipments + Transactions | Label Purchase |
| Bulk label generation from CSV | Batches + Manifests | Batch Shipping (+ shippo/references/csv-format.md) |
| Track packages across carriers | Tracking + webhooks | Tracking |
| Validate user addresses before save | Addresses v2 | Address Validation (+ shippo/references/address-formats.md) |
| Analyze shipping spend / optimize carriers | Shipments + Transactions list | Shipping Analysis |
| International shipments | Customs Items + Declarations | Label Purchase (+ shippo/references/customs-guide.md + shippo/references/international-shipping.md) |
What ships with it
1 file 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.
- 11d ago First seen · 82 lines · 101 tokens per session scan A 8019220ef8b4
shippo-best-practices is a skill published in the GitHub repository goshippo/ai (2 stars, last pushed 6d ago), licensed MIT. It adds 101 tokens to every session and 1,368 once invoked, about $0.0005 per session on Opus 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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