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Passagens MCP server

Which MCP servers are Passagens's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-26

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Whose server it is
  • Registry namedev.passagens/passagens-apiverified in the MCP registry

The registry name sits under passagens.dev. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-26
  • Stateanswerschecked 2026-10-26
  • Tools6
  • Server calls itselfpassagens-api
  • Server version0.2.0
  • Protocol version2025-06-18

On 2026-10-26 the server answered initialize and tools/list without a sign-in. First answer in 32 ms.

Should an agent connect itConnect it, with care
  • Its tools do Watch fare history for a specific route and date; Compare a current fare against its lowest seen price, but not Get email or Telegram alerts on record-low fares.

Once connected

  • For "Watch fare history for a specific route and date", the likely first call is trip_price_history.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 10, the first on 2026-10-26
  • INITE MCP score87 of 100answers 100 · does the job 67 · definitions 83 · context 100 · connects 100
  • What an agent can do with it2 of 3 use cases
  • Answered100% of days10 of 10 daily checks
  • Median first answer117 ms
  • Space in an agent's context≈ 1,916 tokensthe definitions of all its tools (7), which an agent carries on every turn
  • Tool definitionsB · 83 of 100
  • Typed results0 of 7 toolsdeclared outputSchema: results come typed, read once
  • Not saying whether it only reads or can destroy: 7 of 7

What an agent can do with it

  • can do · Watch fare history for a specific route and date
  • cannot · Get email or Telegram alerts on record-low fares
  • can do · Compare a current fare against its lowest seen price

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers6 tools · read 2026-10-26
  • search_flights

    Busca as passagens aéreas mais baratas conhecidas entre dois pontos (preços em cache da Aviasales/Travelpayouts, não disponibilidade em tempo real). Aceita nomes de cidades em português. Cada resultado traz agent_display: markdown em…

  • price_calendar

    Matriz de preço por dia de um mês inteiro entre dois pontos — responde 'quando é mais barato voar'. Aceita nomes de cidades em português. Price-per-day matrix for a month. Booking links contain a referral code (Travelpayouts). The…

  • cheapest_route

    Menor preço conhecido entre dois pontos, com datas flexíveis. Aceita nomes de cidades em português. Lowest known price, flexible dates. Booking links contain a referral code (Travelpayouts). The operator earns a commission on completed…

  • route_price_history

    Histórico de preço da rota inteira, coletado pelo passagens.dev várias vezes ao dia: o menor preço de cada dia (ida e volta de 5 a 15 dias e só ida), mínimo/máximo/média dos últimos 30 dias e se o preço de hoje está abaixo ou acima da…

  • trip_price_history

    Histórico de preço de uma viagem com datas escolhidas (ida e volta), montada com duas passagens só ida que o passagens.dev observa todo dia: total, ida, volta, mínimo e média desde o início da observação, e o preço da ida e volta real…

  • resolve_location

    Resolve um nome de lugar (em português ou qualquer idioma) para códigos IATA de cidade/aeroporto — ex.: 'São Paulo' → SAO (cidade), GRU, CGH. Use quando precisar desambiguar a origem/destino antes de buscar. Resolves place names to IATA…

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "passagens-api": {
      "type": "http",
      "url": "https://passagens.dev/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http passagens https://passagens.dev/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://passagens.dev/mcp as a custom connector in the settings.

OpenAPI spec

10 paths, read 2026-10-26. Open the spec ↗

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.