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DimensionLetsFGFlight and hotel search & booking for AI agentsBioMCPOne binary. One grammar. Evidence from the biomedical sources you already trust.
FMRS46 / 100 · D75 / 100 · B
Reliability8 / 2010 / 20
Security and permissions9 / 2016 / 20
Maintenance9 / 2018 / 20
Documentation11 / 2017 / 20
Setup experience9 / 2014 / 20
Best for
  • Individuals or developers who want to search, compare, and book flights and hotels conversationally through an agent
  • Agent workflows willing to complete a one-time, zero-amount card verification in exchange for free flight search and booking
  • Travel booking flows that specifically need free-cancellation, pay-later hotel options
  • Biomedical researchers
  • Clinicians
  • AI agents that need efficient access to biomedical literature and data analysis
Not for
  • High-volume, commercial-scale integrations wanting prepaid-credit billing (use the separate paid Developer API instead)
  • Users unwilling to keep any payment method on file, since hotel functionality mandates a saved card for every call
  • Use cases requiring guaranteed (non free-cancellation) hotel rates, since only pay-later-eligible rates are sold
  • Users needing to write to upstream databases (read-only)
  • Users requiring direct access to closed datasets (e.g., COSMIC is not directly integrated)
  • Users expecting all advanced features without API keys
Required permissions
  • Network access to letsfg.co's cloud search and booking engine
  • A saved payment method / card on file via `letsfg auth` (a zero-amount Stripe setup used to issue a 90-day Bearer token)
  • For hotel tools, a valid saved payment method required on every call, including search
  • Optional LETSFG_API_KEY secret environment variable, needed only for the paid Developer API path
  • Requires internet access to query public biomedical APIs
  • Optional API keys (NCBI, Semantic Scholar, OpenFDA, etc.) to improve rate limits or unlock features
  • Local read/write access for skills, cache, and local study data (e.g., `~/.local/share/biomcp`)
Risks and side effects
  • Hotel search and booking both mandate a saved, valid card on file for every call — unusual compared to typical free search tools and worth surfacing to users before use
  • Hotel bookings charge a 10% non-refundable reservation fee that is not returned even if the booking is later cancelled
  • Hotel booking is asynchronous, returning a booking_job_id rather than a confirmation; retrying book_hotel blindly for the same rate can double-book the room and double-charge the reservation fee
  • The README explicitly warns against accidentally calling `letsfg register` / `letsfg setup-payment`, which creates a separate paid commercial billing account not intended for the normal agent flow
  • The repository's license field is listed as NOASSERTION while the README claims an MIT license, leaving the actual licensing status somewhat unclear
  • Upstream API rate limits may affect performance
  • Some data sources (e.g., KEGG) have licensing terms that restrict non-academic use
  • Features requiring API keys (e.g., OncoKB) may be incomplete without them
  • Local binary installations need regular updates for compatibility
Supported clientsClaude Desktop, Cursor, WindsurfClaude Desktop, Claude Code, Codex, Other MCP stdio clients
Tools511