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 mtnrabi/travel-agent-skills --skill cheapest-datesgit clone --depth 1 https://github.com/mtnrabi/travel-agent-skillsWrote 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/mtnrabi/travel-agent-skills/cheapest-dates)<a href="https://agentmods.dev/skills/mtnrabi/travel-agent-skills/cheapest-dates"><img src="https://agentmods.dev/badge/skills/mtnrabi/travel-agent-skills/cheapest-dates/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/mtnrabi/travel-agent-skills/cheapest-dates"><img src="https://agentmods.dev/badge/skills/mtnrabi/travel-agent-skills/cheapest-dates.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 | $0.00000 | $0.02381 |
| Opus 5 | $0.00000 | $0.01190 |
| Sonnet 5 | $0.00000 | $0.00476 |
| Haiku 4.5 | $0.00000 | $0.00238 |
Grade A, and why
cheapest-dates scanned grade A with 1 finding 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -s -X POST 'https://google-flights-live-api.p.rapidapi.com/api/google_flights/oneway/v1' \ How it starts
The opening of the file, as written. The whole thing — 102 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Cheapest Dates
Overview
Answers "when is it cheapest to fly X to Y" — and, for round trips, "how long a stay is cheapest" — by pricing a range of departure dates, and a set of trip lengths in nights, then judging the winner against Google's own historical band for that route and period. Use travel-data-api for auth, base URL, and endpoint details, and prefer the hosted MCP tools when a client is configured, because the MCP tools take a date range in a single call while the REST path costs one billed request per date. Every result item carries price_range_in_relation_to_other_periods (low | typical | high), price_insights_low, price_insights_high, departure_date, and buy_link — the verdict field is the differentiator and it leads the answer. The remaining fields differ by trip type: one-way items carry price_as_number, airline, stops, and duration_seconds, while round-trip items carry total_price_as_number, total_stops, total_duration_seconds, return_date, and per-leg fields such as departure_flight_airline, departure_flight_stops, departure_flight_duration, and their return_flight_* counterparts. Do not read airline, stops, or duration_seconds off a round-trip item; those keys are not there.
Endpoints and Tools
| Job | REST endpoint (one call per date) | MCP tool (one call per range) |
|---|---|---|
| Cheapest one-way departure date | POST /api/google_flights/oneway/v1 |
search_oneway_flights |
| Cheapest round-trip departure date / trip length | POST /api/google_flights/roundtrip/v1 |
search_roundtrip_flights |
REST host: google-flights-live-api.p.rapidapi.com. MCP servers: https://flights.flightpowers.com/mcp (paid, ad-free, caller's own RapidAPI key, fan-out cap 30 per call and 60 max, reports api_usage in every response) and https://google-flights-lulu.flightpowers.com/mcp (free, ad-supported, no key, fan-out cap 15 per call).
Workflow
- Pin down origin IATA, destination IATA, the date window, and whether the trip is one-way or round-trip. For round-trip, get trip length in nights — that is what makes the MCP range search collapse to one call.
- Check whether an MCP client is configured. If yes, issue one
search_oneway_flightsorsearch_roundtrip_flightscall withdeparture_date_fromanddeparture_date_tocovering the whole window (andnightsfor round-trip, a number or a list like[5,6,7]). Never loop the MCP tools one date at a time. - If only REST is available, state the cost before calling: a 14-day one-way scan is 14 billed requests, and a round-trip scan is one request per departure/return combination, which multiplies fast. Get the user's go-ahead, or narrow the window first.
- Collect the lowest
price_as_number/total_price_as_numberper date, sort client-side, and note the date and airline of the minimum. - Read
price_range_in_relation_to_other_periodsand theprice_insights_low/price_insights_highband from the winning item, then lead the answer with that verdict — the cheapest date found is not automatically a good deal.
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 · 102 lines · 0 tokens per session scan A 615b13cecc6b
cheapest-dates is a skill published in the GitHub repository mtnrabi/travel-agent-skills (4 stars, last pushed 8d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 2,381 tokens. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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