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 upgrade-shippogit 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/upgrade-shippo)<a href="https://agentmods.dev/skills/goshippo/ai/upgrade-shippo"><img src="https://agentmods.dev/badge/skills/goshippo/ai/upgrade-shippo/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/upgrade-shippo"><img src="https://agentmods.dev/badge/skills/goshippo/ai/upgrade-shippo.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 | $0.00067 | $0.00748 |
| Opus 5 | $0.00034 | $0.00374 |
| Sonnet 5 | $0.00013 | $0.00150 |
| Haiku 4.5 | $0.00007 | $0.00075 |
Grade A, and why
upgrade-shippo 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 10d 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.
The Shippo MCP is hosted at https://mcp.shippo.com. It is OAuth-only and auto-updates server-side, so there is nothing to install or upgrade on your side. This skill covers what stays your responsibility: API version awareness, webhook payload versioning, and troubleshooting the hosted session.
API version handling
The current Shippo API version is 2018-02-08. Shippo uses a single long-lived API version, and the hosted server manages it for you server-side. You do not set the Shippo-API-Version header yourself when going through the hosted MCP.
What backward-compatibility means in practice:
- Most changes are backward-compatible: new optional fields, new resources, additional webhook events. Existing calls keep working.
- Breaking changes are rare and announced via release notes.
- Because the server picks the version, you don't pin anything client-side. Your job is to handle new fields gracefully (see webhook versioning below) rather than to manage versions.
Shippo API changes are tracked in the API changelog. As of 2026-06, no recent breaking changes affect the workflows covered by this skill set.
Webhook event versioning
Webhook events can include new fields without bumping the API version. To handle them gracefully:
- Default to ignoring unknown fields in your webhook handler, never fail-closed on a field you don't recognize.
- Subscribe only to the specific event types you need (
track_updated,transaction_created,transaction_updated, etc.). - Verify webhook signatures using the
Shippo-Signatureheader per webhook docs.
Troubleshooting the hosted MCP
401 or 403 errors
The OAuth session has expired or is not authorized. Re-authorize the Shippo OAuth session: in Claude Code, run /mcp and sign in again.
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.
- 10d ago First seen · 61 lines · 67 tokens per session scan A eb74251f6442
upgrade-shippo is a skill published in the GitHub repository goshippo/ai (2 stars, last pushed 5d ago), licensed MIT. It adds 67 tokens to every session and 748 once invoked, about $0.0003 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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