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 rate-shoppinggit 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/rate-shopping)<a href="https://agentmods.dev/skills/goshippo/ai/rate-shopping"><img src="https://agentmods.dev/badge/skills/goshippo/ai/rate-shopping/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/rate-shopping"><img src="https://agentmods.dev/badge/skills/goshippo/ai/rate-shopping.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 | $0.00026 | $0.00791 |
| Opus 5 | $0.00013 | $0.00396 |
| Sonnet 5 | $0.00005 | $0.00158 |
| Haiku 4.5 | $0.00003 | $0.00079 |
Grade A, and why
rate-shopping 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 9d 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 — 74 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Rate Shopping and Comparison
Get Rates for a Shipment
- Collect: origin address, destination address, parcel (length, width, height, distance_unit, weight, mass_unit). All dimension and weight values must be strings (e.g.,
"10"not10). - Optionally validate both addresses with
ValidateAddress(see Address Validation). - Call
CreateShipmentwithaddress_from,address_to(as inline address objects using v1 field names --street1,city,state,zip,country-- not object IDs), andparcels. - The response
ratesarray contains available options. Present a table: carrier, service level, price, estimated days. - Note: the same carrier may return duplicate rates from multiple carrier accounts. Present the best rate per carrier/service combination.
- Each rate carries an
object_id. To buy a label, pass the chosen rate'sobject_idto the purchase flow (see Label Purchase); you do not re-send the address or parcel.
Rate Expiration
Rates expire after 7 days. If a user tries to purchase a rate that was retrieved more than 7 days ago, create a new shipment to get fresh rates.
Filter by Speed
Map user requests: "overnight" = estimated_days 1, "2-day" = estimated_days <= 2, "within N days" = estimated_days <= N. Filter the rates array accordingly. If nothing matches, show the fastest available option.
International Rates
Some carriers may return international rates without a customs declaration, but others will not. If no rates are returned, try attaching a customs declaration to the shipment. Some carriers also require a phone number on the destination address for international rate retrieval. Inform the user that customs will be required at label purchase time regardless. See shippo/references/customs-guide.md for customs details.
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.
- 9d ago First seen · 74 lines · 26 tokens per session scan A 84330386d052
rate-shopping is a skill published in the GitHub repository goshippo/ai (2 stars, last pushed 5d ago), licensed MIT. It adds 26 tokens to every session and 791 once invoked, about $0.0001 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.
Other skills, from other repositories
shop
Use when the user wants Axon-backed product research, product comparisons, review synthesis, budget-aware recommendations, or cart preparation without checkout.
product-price-monitor
Watch product, flight, or listing prices; alert on target.
refunds
Check refund eligibility and use the refund-order tool safely.
snack-batching
Weekly snack-request batching for {{officechannel}}. Collects Slack shortcut submissions since the last order, consolidates duplicates and standing staples, builds a cart against {{preferredvendor}} within {{weeklybudget}}, and posts it for the office manager to approve before anything is placed.
logistics-ops
Use when an order is paid and packed and the box now has to move, go sideways, or come back — picking a carrier and service and cutting a label, reacting to a delivery exception, getting ahead of where-is-my-order tickets, running a return, exchange or refund with its reverse label, filing a carrier claim before the…
blast-radius
Trace ServiceNow configuration dependencies — what artifacts touch a given field, what calls a script include, table/app-level config inventory. Use before deletes, renames, or refactors.