# Airfare Brain (remote · airfarebrain.com)

True cost of flight extras (bags, seats, fees) on 29 airlines in Europe and North America, sourced.

- Trust score: 74/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `airfarebrain.com`: 74/100 (this document), [markdown](https://verifymcp.io/servers/com-airfarebrain-airfare-brain/airfarebrain.md), [page](https://verifymcp.io/servers/com-airfarebrain-airfare-brain/airfarebrain)

## Channel facts

- Endpoint: `https://airfarebrain.com/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.6`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-11-05.

- **Endpoint Security**: 74/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Nothing on it is marked destructive, but we can't show that an anonymous caller can only read: full credit needs the server to list at least one tool and every tool to be verifiably read-only. We use a best-effort check of tool names and descriptions to tell read-only tools from tools that change things, so some genuinely read-only tools may not get full credit. Names that start with a read verb (get, list, read, search and similar) and accurate readOnlyHint annotations help. Meet that to earn full credit, or require authorisation.
  - HTTPS is enforced; there's no plaintext access path.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 60/100
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 1257 tokens (~251/item across 5 items; 5 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 53/100
  - Stability observed for 16 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 5 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 6 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

## Install

### How do I install the Airfare Brain MCP server?

Airfare Brain is a hosted endpoint at https://airfarebrain.com/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http com-airfarebrain-airfare-brain 'https://airfarebrain.com/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "com-airfarebrain-airfare-brain": {
      "url": "https://airfarebrain.com/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "com-airfarebrain-airfare-brain": {
      "type": "http",
      "url": "https://airfarebrain.com/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.com-airfarebrain-airfare-brain]
url = "https://airfarebrain.com/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "com-airfarebrain-airfare-brain": {
      "type": "remote",
      "url": "https://airfarebrain.com/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add com-airfarebrain-airfare-brain --url 'https://airfarebrain.com/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  com-airfarebrain-airfare-brain:
    url: "https://airfarebrain.com/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "com-airfarebrain-airfare-brain": {
      "Transport": "http",
      "Url": "https://airfarebrain.com/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add com-airfarebrain-airfare-brain -t streamable-http -u 'https://airfarebrain.com/mcp'
```

### Other

```json
{
  "mcpServers": {
    "com-airfarebrain-airfare-brain": {
      "type": "http",
      "url": "https://airfarebrain.com/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-11-04 (score 74, +1)

No change was recorded against any check on this day. Stability & Change Management went from 47 to 50. That category is still filling its 30-day observation window: 14 days of observed history at the previous scan, 15 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-02 (score 73, +1)

No change was recorded against any check on this day. Stability & Change Management went from 40 to 43. That category is still filling its 30-day observation window: 12 days of observed history at the previous scan, 13 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-31 (score 72, +1)

No change was recorded against any check on this day. Stability & Change Management went from 33 to 37. That category is still filling its 30-day observation window: 10 days of observed history at the previous scan, 11 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-30 (score 71, 0)

- [functional regression] Schema quality: 222 → 251
- [cosmetic] “trip_at_airport” added an optional parameter “domestic”
- [cosmetic] “trip_at_airport” added an optional parameter “group_bags”
- [cosmetic] “true_cost” added an optional parameter “domestic”
- [cosmetic] “true_cost” added an optional parameter “group_bags”

### 2026-10-29 (score 71, +2)

- [functional regression] Schema quality: 183 → 222
- [functional improvement] Tool coverage: 48% → 100%
- [functional] Server version: 1.0.5 → 1.0.6
- [cosmetic] “airline_fees” reworded the description of “category”
- [cosmetic] “airline_fees” reworded the description of “currency”
- [cosmetic] “trip_at_airport” reworded the description of “cabin_bag”
- [cosmetic] “trip_at_airport” reworded the description of “checked_bag_kg”
- [cosmetic] “trip_at_airport” reworded the description of “currency”
- [cosmetic] “trip_at_airport” reworded the description of “hold_bags”
- [cosmetic] “trip_at_airport” reworded the description of “infants”
- [cosmetic] “trip_at_airport” reworded the description of “passengers”
- [cosmetic] “trip_at_airport” reworded the description of “priority”
- [cosmetic] “trip_at_airport” reworded the description of “seat”
- [cosmetic] “trip_at_airport” reworded the description of “trip”
- [cosmetic] “true_cost” reworded the description of “currency”
- [cosmetic] “true_cost” reworded the description of “priority”
- [cosmetic] “true_cost” reworded the description of “trip”

### 2026-10-27 (score 69, +1)

- [security] The server rewrote its instructions, which are the text every model session reads
- [security] Tool “get_capabilities” rewrote its description, which is the text the model reads
- [security] Tool “trip_at_airport” rewrote its description, which is the text the model reads
- [functional] Server version: 1.0.0 → 1.0.5

### 2026-10-25 (score 68, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-24 (score 67, −1)

- [functional regression] Schema quality: 166 → 187
- [functional regression] Tool coverage: 64% → 48%
- [functional] New tool “trip_at_airport”

## MCP tools (5)

### `get_capabilities` (~48 tokens)

Get capabilities

What Airfare Brain covers: airlines, how fees are researched and dated, what it does NOT do (no live fares, no booking), and what car hire at the destination airport typically costs.

Output parameters:

- `airlines` (array)
- `error` (string)
- `method` (string)
- `note` (string)

### `list_airlines` (~34 tokens)

List airlines

List every airline with a fee table: name, IATA code, the date its fees were checked, and its page.

Output parameters:

- `airlines` (array)
- `error` (string)
- `note` (string)

### `airline_fees` (~139 tokens)

Airline fees

One airline's published extra fees (bags, seats, priority, check-in, changes, payment), each with the price range, when bought (at booking / later / airport), how it is charged, its source URL and the date checked. Optionally filter by category.

Input parameters:

- `airline` (string, required): Name or IATA code, e.g. 'Ryanair', 'FR', 'easyJet', 'W6'
- `category` (string): Only fees of this kind; omit for every fee the airline publishes
- `currency` (string): Currency of the answer: EUR (default) or GBP, as the airline publishes it

Output parameters:

- `airline` (string)
- `error` (string)
- `fees` (array)
- `note` (string)
- `page` (string)

### `true_cost` (~387 tokens)

True cost

The true cost of a flight on one airline. Pass `fare` (the total for the whole party, from a flight-search tool or the person) to get fare + extras; without it you get the extras alone. Extras = what the person chooses (cabin bag, checked bag by kg, seat, priority, infants) for their party and trip, as the range the airline publishes. Also lists what costs more if left until the airport, unchosen fees that may apply (admin, card %), and extras the airline does not publish a price for.

Input parameters:

- `airline` (string, required): Name or IATA code
- `cabin_bag` (boolean): A large cabin bag for the overhead locker
- `checked_bag_kg` (integer): Checked bag(s) per person of this weight allowance
- `currency` (string): Currency of the answer: EUR (default) or GBP, as the airline publishes it
- `domestic` (boolean): true for a flight within the US: US airlines charge different bag prices there than on international routes
- `fare` (number): Total fare already found for the whole party, if known
- `group_bags` (integer): Checked bags shared by the whole party, fewer than the people (e.g. 1 bag between 2): priced as that many 1st bags; needs checked_bag_kg
- `hold_bags` (integer): Checked bags per person (default 1); the 2nd bag often costs more
- `infants` (integer): Under-2s on a lap
- `passengers` (integer): People aged 2+ (default 1)
- `priority` (boolean): Priority boarding
- `seat` (string): extra = legroom / front
- `trip` (string): one_way (default) or return: return counts each extra on both flights

Output parameters:

- `airline` (string)
- `error` (string)
- `extras_total` (string)
- `lines` (array)
- `note` (string)
- `page` (string)
- `true_cost` (string)

### `trip_at_airport` (~471 tokens)

Trip at airport

The whole trip into one airport in one answer: the flight's extras on an airline (bags, seats, fees, as true_cost) AND what car hire there really costs (Car Rental Brain's measured median per day, car only, dated). Use for 'flying to Faro with Ryanair, bags and a hire car: what will it cost?'. Car only: deposits, second-driver fees and desk cover are not included; the answer links to the airport's full car-hire report.

Input parameters:

- `airline` (string): Airline name or IATA code (optional; without it you get car hire only)
- `airport` (string, required): IATA code or name of the airport you fly INTO, e.g. 'FAO', 'Faro', 'Malaga'
- `cabin_bag` (boolean): A large cabin bag for the overhead locker (the small under-seat bag is free)
- `car_days` (integer): Days of car hire (default 7)
- `checked_bag_kg` (integer): Checked bag(s) per person of this weight allowance, e.g. 20 or 23; omit for none
- `currency` (string): Currency of the answer: EUR (default) or GBP, as the airline publishes it
- `domestic` (boolean): true for a flight within the US: US airlines charge different bag prices there than on international routes
- `fare` (number): Total fare for the whole party, if known
- `group_bags` (integer): Checked bags shared by the whole party, fewer than the people (e.g. 1 bag between 2): priced as that many 1st bags; needs checked_bag_kg
- `hold_bags` (integer): Checked bags per person (default 1); the 2nd bag often costs more
- `infants` (integer): Under-2s on a lap (default 0)
- `passengers` (integer): People aged 2+ (default 1)
- `priority` (boolean): Priority boarding
- `seat` (string): Paid seat choice: none (random seat), standard, or extra (legroom / front)
- `trip` (string): one_way (default) or return: return counts each extra on both flights

Output parameters:

- `airport` (object)
- `car_hire` (object)
- `error` (string)
- `flight` (object)
- `note` (string)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/com-airfarebrain-airfare-brain/airfarebrain#diagnostics

## Score history

- 2026-11-05: 74
- 2026-11-04: 74
- 2026-11-03: 73
- 2026-11-02: 73
- 2026-11-01: 72
- 2026-10-31: 72
- 2026-10-30: 71
- 2026-10-29: 71
- 2026-10-28: 69
- 2026-10-27: 69
- 2026-10-26: 68
- 2026-10-25: 68
- 2026-10-24: 67
- 2026-10-23: 68
- 2026-10-22: 68
- 2026-10-21: 67
- 2026-10-20: 67

## Common questions

### What is the Airfare Brain MCP server?

Airfare Brain is an MCP server listed in the public MCP registry as com.airfarebrain/airfare-brain. True cost of flight extras (bags, seats, fees) on 29 airlines in Europe and North America, sourced. This page covers its hosted endpoint (https://airfarebrain.com/mcp).

### Is the Airfare Brain MCP server safe to use?

Airfare Brain scores 74 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Airfare Brain MCP server expose?

Airfare Brain exposes 5 tools: get_capabilities, list_airlines, airline_fees, true_cost, trip_at_airport. Their descriptions and schemas cost roughly 1,079 tokens of context every time the server is loaded.

### Does the Airfare Brain MCP server require authentication?

No. We connected to Airfare Brain without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Airfare Brain MCP server still maintained?

Airfare Brain is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What did VerifyMCP test on the Airfare Brain MCP server?

VerifyMCP ran 13 checks on Airfare Brain, covering TLS certificate, Authorization, HTTPS, HSTS header and 9 more. Supply Chain Security and Provenance & Transparency do not apply to a hosted endpoint, so they were not tested. The score does not measure everything, and the scoring documentation lists what it leaves out.

## Links

- Remote endpoint: https://airfarebrain.com/mcp
- Repository: https://github.com/jimiwalters-cmyk/airfare-brain-mcp
- Website: https://airfarebrain.com/
- Changelog RSS feed: https://verifymcp.io/servers/com-airfarebrain-airfare-brain/airfarebrain.xml
- Changelog JSON feed: https://verifymcp.io/servers/com-airfarebrain-airfare-brain/airfarebrain/changelog.json
- Trust report (JSON): https://verifymcp.io/servers/com-airfarebrain-airfare-brain/airfarebrain.json
- HTML version of this page: https://verifymcp.io/servers/com-airfarebrain-airfare-brain/airfarebrain