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 agentmods add skills/borski/travel-hacking-toolkit/biltnpx skills add borski/travel-hacking-toolkit --skill biltgit clone --depth 1 https://github.com/borski/travel-hacking-toolkitWrote 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/borski/travel-hacking-toolkit/bilt)<a href="https://agentmods.dev/skills/borski/travel-hacking-toolkit/bilt"><img src="https://agentmods.dev/badge/skills/borski/travel-hacking-toolkit/bilt.svg" alt="Measured on agentmods" 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 | $0.00044 | $0.04281 |
| Opus 5 | $0.00022 | $0.02141 |
| Sonnet 5 | $0.00009 | $0.00856 |
| Haiku 4.5 | $0.00004 | $0.00428 |
Grade A, and why
bilt 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 6d 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.
allowed-tools: Bash(curl *), Bash(jq *) How it starts
The opening of the file, as written. The whole thing — 375 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Bilt Travel Portal Search
Search Bilt Rewards travel portal via the public REST API. No authentication required for search. Returns both cash prices in USD and Bilt Points cost for hotels and flights.
Important: Bilt is Whitelabel Duffel
Bilt's travel search is built directly on top of Duffel. All evidence points to a complete white-label arrangement, not a partial integration:
- Flight offer IDs are
off_XXX, slicessli_XXX, segmentsseg_XXX, aircraftarc_XXX, airlinesarl_XXX. All Duffel ID patterns. - Carrier and aircraft logos served from
assets.duffel.com. - Hotel loyalty program logos served from
assets.duffel.com/img/stays/loyalty-programmes. So hotels are Duffel Stays. - JWT
organisation_id: org_0000AaALZyFQ...is a Duffel auth pattern. - Field names match Duffel exactly:
marketingCarrier,operatingCarrier,cabinClassMarketingName,fareBasisCode,isNDC,ndcRedirectUrl,totalEmissionsKg,slices[].segments[].passengers[].baggages[].
What Bilt adds on top of Duffel:
totalPointsRequired(Bilt Points cost at the fixed 1.25 cpp portal rate)isHafh(Home Away From Home flag on hotels)loyaltyProgram.reference(brand affiliation surfacing for hotels)- A few Bilt-specific filter fields
What this means for the toolkit:
- For cash-only flight searches, prefer the duffel skill. It uses an authenticated Duffel API key, returns the same data faster, and supports more parameters (multi-city, time windows, max connections, supplier_timeout tuning).
- For Bilt Points context (CPP, comparing portal cost to award alternatives, Bilt redemption math), use this skill. The points pricing is exclusive to Bilt's endpoint.
- For Home Away From Home property research, use this skill. The
isHafhflag is Bilt-specific and surfaces the $300+ benefits properties.
Why It Matters
- 1.25 cpp standard redemption rate on Bilt Points (1 USD = 80 points). One of the better fixed portal rates.
- Home Away From Home (HaFH) is Bilt's premium hotel program. Gold and Platinum members get $300+ in benefits per stay (daily breakfast for two, $100 property credit, room upgrades on arrival, early check-in / late check-out, dedicated Virtuoso Travel Advisor).
- Bilt Points transfer 1:1 to Hyatt, Marriott, Hilton, IHG, United, AA, Air Canada Aeroplan, Air France/KLM, Virgin Atlantic, Cathay, Turkish, and more — so this portal is a 1.25 cpp "bottom-of-the-barrel" comparison point for transfer-partner award searches.
- Flights are Duffel-backed. Same response shape as the duffel skill. Same airlines, same fare classes, same segment structure.
- No auth needed for search. Browser automation, login, 2FA all unnecessary. Just curl.
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.
- 6d ago First seen · 375 lines · 44 tokens per session scan A bf7e948e6f8f
bilt is a skill published in the GitHub repository borski/travel-hacking-toolkit (650 stars, last pushed 5d ago), licensed MIT. It adds 44 tokens to every session and 4,281 once invoked, about $0.0002 per session on Opus 5. 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 2026-08-30.
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