# RentalCal (remote · api.rentalcal.com)

Find direct-booking vacation rentals, check availability, and get stay quotes.

- Trust score: 76/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-24

## Components

- remote · `api.rentalcal.com`: 76/100 (this document), [markdown](https://verifymcp.io/servers/com-rentalcal-rentalcal/api.md), [page](https://verifymcp.io/servers/com-rentalcal-rentalcal/api)

## Channel facts

- Endpoint: `https://api.rentalcal.com/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.1.0`

## 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 2026-10-24.

- **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. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - 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**: 67/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 805 tokens (~201/item across 4 items; 4 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 47/100
  - Stability observed for 14 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.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 4 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 5 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the RentalCal MCP server?

RentalCal is a hosted endpoint at https://api.rentalcal.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-rentalcal-rentalcal 'https://api.rentalcal.com/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "com-rentalcal-rentalcal": {
      "url": "https://api.rentalcal.com/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "com-rentalcal-rentalcal": {
      "type": "http",
      "url": "https://api.rentalcal.com/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.com-rentalcal-rentalcal]
url = "https://api.rentalcal.com/mcp"
```

### opencode

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

### OpenClaw

```bash
openclaw mcp add com-rentalcal-rentalcal --url 'https://api.rentalcal.com/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  com-rentalcal-rentalcal:
    url: "https://api.rentalcal.com/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "com-rentalcal-rentalcal": {
      "Transport": "http",
      "Url": "https://api.rentalcal.com/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add com-rentalcal-rentalcal -t streamable-http -u 'https://api.rentalcal.com/mcp'
```

### Other

```json
{
  "mcpServers": {
    "com-rentalcal-rentalcal": {
      "type": "http",
      "url": "https://api.rentalcal.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.

### 2026-10-23 (score 76, +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.

### 2026-10-21 (score 75, +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.

### 2026-10-19 (score 74, +1)

No change was recorded against any check on this day. Stability & Change Management went from 27 to 30. That category is still filling its 30-day observation window: 8 days of observed history at the previous scan, 9 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-17 (score 73, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-16 (score 72, 0)

- [security] The server rewrote its instructions, which are the text every model session reads
- [security] Tool “find_property” rewrote its description, which is the text the model reads
- [cosmetic] “find_property” reworded the description of “site”

### 2026-10-15 (score 72, +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.

### 2026-10-12 (score 71, +1)

- [security] The server rewrote its instructions, which are the text every model session reads
- [security] Tool “check_availability” rewrote its description, which is the text the model reads
- [functional regression] Schema quality: 169 → 200
- [functional improvement] Stability: unverified → 0.07
- [functional] Server version: 1.0.1 → 1.1.0
- [cosmetic] “get_quote” added an optional parameter “infants”
- [cosmetic] “get_quote” reworded the description of “guests”

### 2026-10-10 (score 70)

First indexed and scored.

## MCP tools (4)

### `find_property` (~159 tokens)

Find a RentalCal property

Look up a vacation rental by its RentalCal booking site, or by the page on the host's own website where their RentalCal booking widget is installed. Accepts a site address such as beach-house.rentalcal.com, a full URL, the bare site name, or the host's own domain. Returns the listing: description, location, capacity, amenities, house rules, photos, nightly pricing, cancellation policy, payment schedule, damage deposit, the host's FAQ, and the property id. When one website hosts several properties, returns those candidates instead.

Input parameters:

- `site` (string, required): The booking site's address or URL, e.g. beach-house.rentalcal.com, or the address of the host's own page with the booking widget on it.

### `get_property` (~81 tokens)

Get property details

The full listing for a property id: description, location, check-in and check-out times, capacity, pets, amenities, house rules, photos, nightly pricing and fees, cancellation policy, payment schedule, damage deposit, and the host's FAQ. Amounts are integer cents in the property's currency.

Input parameters:

- `propertyId` (string, required): A RentalCal property id.

### `check_availability` (~141 tokens)

Check availability

Booked nights and the open date ranges a stay can actually be booked in, with minimum-stay rules applied. bookableUntil is the first night the host's booking window has not opened yet (null for no limit); nights after it are not open rather than taken. Defaults to the next 90 days; at most 365 days per call. Ranges are check-in inclusive, check-out exclusive.

Input parameters:

- `from` (string): First date to check, YYYY-MM-DD. Defaults to today.
- `propertyId` (string, required): A RentalCal property id.
- `to` (string): Day after the last date to check, YYYY-MM-DD.

### `get_quote` (~216 tokens)

Price a stay

The exact price of a stay: nightly rates, discounts, cleaning and other fees, taxes and total, in integer cents, plus any refundable damage deposit the host requires and whether it is held at booking. Returns a bookingUrl that opens the host's booking page with these dates and guests filled in, where the traveller completes the booking. If the stay is not allowed (dates taken, below the minimum stay, too many guests) the reason is returned instead.

Input parameters:

- `checkIn` (string, required): Arrival date, YYYY-MM-DD.
- `checkOut` (string, required): Departure date, YYYY-MM-DD.
- `guests` (integer, required): Number of guests, not counting pets or infants. Where the listing's infants is null, count babies here.
- `infants` (integer): Children under the listing's infants.freeUnderAge. Free, and outside maxGuests. Only where the listing's infants is not null; leave out otherwise.
- `pets` (integer): Number of pets.
- `propertyId` (string, required): A RentalCal property id.

## Diagnostics

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

## Score history

- 2026-10-24: 76
- 2026-10-23: 76
- 2026-10-22: 75
- 2026-10-21: 75
- 2026-10-20: 74
- 2026-10-19: 74
- 2026-10-18: 73
- 2026-10-17: 73
- 2026-10-16: 72
- 2026-10-15: 72
- 2026-10-14: 71
- 2026-10-13: 71
- 2026-10-12: 71
- 2026-10-10: 70

## Common questions

### What is the RentalCal MCP server?

RentalCal is an MCP server listed in the public MCP registry as com.rentalcal/rentalcal. Find direct-booking vacation rentals, check availability, and get stay quotes. This page covers its hosted endpoint (https://api.rentalcal.com/mcp).

### Is the RentalCal MCP server safe to use?

RentalCal scores 76 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 RentalCal MCP server expose?

RentalCal exposes 4 tools: find_property, get_property, check_availability, get_quote. Their descriptions and schemas cost roughly 597 tokens of context every time the server is loaded.

### Does the RentalCal MCP server require authentication?

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

### Is the RentalCal MCP server still maintained?

RentalCal is still listed as active in the MCP registry. We last reached this channel on 24 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://api.rentalcal.com/mcp
- Website: https://www.rentalcal.com/
- Changelog RSS feed: https://verifymcp.io/servers/com-rentalcal-rentalcal/api.xml
- Changelog JSON feed: https://verifymcp.io/servers/com-rentalcal-rentalcal/api.json
- HTML version of this page: https://verifymcp.io/servers/com-rentalcal-rentalcal/api