cohoststr-mcp

CohostSTR — MCP server for Guesty

An open-source, write-capable MCP (Model Context Protocol) server for Guesty property management. Connect any MCP-compatible AI client (Claude, ChatGPT, Copilot, Cline) to your Guesty account — manage reservations, communicate with guests, track finances, update pricing.

Live now: all 43 Guesty tools, free — reservations, listings, guests, calendars, guest messaging, financial reports, pricing and listing writes, operations, reviews, webhooks, and IoT/property-health. No license key, no paid tier.

Why MCP: Guesty is one of the larger PMS platforms in the short-term-rental space and no MCP integration existed. Every major PMS will need one.

Built and run in production on our own short-term rental portfolio. Node.js + MCP SDK + Express, MIT licensed. Things we learned: Guesty's /reservations endpoint only returns future data (we use the calendar endpoint for historical), and the SSE transport doesn't run on Vercel serverless (expected). All 44 tools free.

Full tool surface: 44 tools registered, all free — 43 Guesty tools (23 read-only, 16 write/guest-messaging including get_conversations and draft_guest_reply, and 4 IoT/property-health) plus get_license_info, which reports this server's own licensing state and makes no Guesty API call. There are no paid tiers. GUESTY_MCP_LICENSE_KEY is optional and does not change what you can call.

Everything is free. All 44 tools work with no license key. Paid-prefix keys are still recognized (they show up in get_license_info) but are not required and unlock nothing extra — there is nothing extra to unlock. Set or omit GUESTY_MCP_LICENSE_KEY; access is the same either way.

Quick Start

Easiest: one command for Claude Desktop (your key is never shown on screen)

npx -y cohoststr-mcp setup

It asks for your Guesty Client ID and Client Secret in a hidden prompt (nothing is echoed, not even asterisks), backs up your existing Claude Desktop config, adds CohostSTR, and keeps any other MCP servers you already have. Then quit and reopen Claude Desktop. When Claude asks to use a tool that changes something, allow it one time only (not "always"), so you approve each change.

Or configure it yourself

npx cohoststr-mcp

Claude Code:

claude mcp add cohoststr -s user -e GUESTY_CLIENT_ID=your-client-id -e GUESTY_CLIENT_SECRET=your-client-secret -- npx -y cohoststr-mcp

Claude Desktop by hand: Settings > Developer > Edit Config, then add under mcpServers:

{
  "mcpServers": {
    "cohoststr": {
      "command": "npx",
      "args": ["-y", "cohoststr-mcp"],
      "env": {
        "GUESTY_CLIENT_ID": "your-client-id",
        "GUESTY_CLIENT_SECRET": "your-client-secret"
      }
    }
  }
}

Get Guesty API Credentials

Requires a Guesty plan with Open API access (Pro or Enterprise; not Lite, per guesty.com/pricing).

• Log into Guesty
• Go to Integrations > Developer tools > OAuth applications and create a new API application (Guesty quick-start guide)
• Copy your Client ID and Client Secret (Guesty shows the secret only once)

All 44 Tools

Reservations & Guests

Tool	Description
get_reservations	Fetch reservations with filters (dates, listing, status, guest)
create_reservation	Create direct bookings (website to Guesty)
update_reservation	Update reservation status, dates, guest info, or add notes
search_reservations	Search by guest name, email, or confirmation code
get_reservation_financials	Detailed financial breakdown for a reservation
create_reservation_note	Add internal notes to a reservation
get_guests	Search guest database by name or email
get_guest_by_id	Get detailed guest profile

Listings & Calendar

Tool	Description
get_listing	Get property details or list all properties
update_listing	Update title, description, amenities, min nights, max guests
get_calendar	Check availability and pricing by date
update_calendar	Block/unblock dates, set minimum nights
get_calendar_blocks	Get blocked dates with reasons
get_listing_occupancy	Calculate occupancy rate over a date range
get_photos	Fetch listing photos with captions
update_photos	Replace or reorder listing photos

Messaging

Tool	Description
get_conversations	Fetch guest message history
send_guest_message	Send messages to guests in conversations

Financials & Pricing

Tool	Description
get_financials	Revenue, payouts, and commission data
update_pricing	Update base price or date-specific pricing
get_listing_pricing	Get base price, discounts, and fee details
update_listing_pricing	Update base price, cleaning fee, discounts
get_owner_statements	Owner revenue statements and reports
get_expenses	Track operational expenses
create_expense	Create new expense records
get_revenue_summary	Aggregated revenue across all listings

Operations

Tool	Description
get_tasks	Fetch cleaning and maintenance tasks
create_task	Create cleaning or maintenance tasks
get_reviews	Fetch guest reviews from all channels
respond_to_review	Post responses to guest reviews
get_channels	List connected booking channels per property
get_supported_languages	Get supported languages for a listing

Automation & Integrations

Tool	Description
get_automation_rules	List automation and workflow rules
get_webhooks	List registered webhooks
create_webhook	Register new webhook for event notifications
delete_webhook	Remove a registered webhook
get_custom_fields	Fetch custom fields for listings or reservations
get_account_info	Get account info and subscription details

Server & Licensing

Tool	Description
get_license_info	Report this MCP server's own licensing state — every tool is currently free; lists the tool ledger and whether a key was detected. Makes no Guesty API call.

It is counted in the 44 registered tools but not in the "43 Guesty tools" figure, because it reports our licensing state rather than doing anything with your Guesty account: 43 Guesty tools + this one = 44.

IoT & Property Health

Tool	Description
get_readiness_score	Composite turnover-readiness score for a property from cleaning, maintenance, and IoT signals
get_property_health	Aggregate health signal per property: reservation status, open maintenance alerts, review-score, last-clean timestamp, IoT hub status
submit_checkout_photos	Accept post-checkout photo uploads and log them to the property's maintenance/cleaning record
get_maintenance_alerts	List or filter open maintenance alerts for a property or portfolio

These four tools are free like everything else. They read the local IoT database (IOT_DB_PATH) that the optional webhook receiver (src/webhook/iot-receiver-server.js) populates. With no devices reporting they return empty device and alert lists, a low readiness score that names each missing signal, and null IoT fields in the health snapshot — not errors — and the Guesty-side fields still fill in.

Use Cases

• Guest Communication: guest-messaging tools draft and send replies grounded in real reservation data
• Revenue Management: Pull financial reports, analyze occupancy, optimize pricing
• Operations: Track check-ins/outs, coordinate cleaning schedules, manage availability
• Marketing: Identify low-occupancy periods, create targeted promotions
• Connected Tools: give every MCP-compatible client in your stack access to the same property data

Requirements

• Node.js 18+
• Guesty account with API access (Professional plan or higher)
• MCP-compatible AI client (Claude Code, Cursor, Windsurf, etc.)

Environment Variables

Variable	Default	Purpose
GUESTY_CLIENT_ID	—	OAuth2 client id (required)
GUESTY_CLIENT_SECRET	—	OAuth2 client secret (required)
IOT_WEBHOOK_PORT	3100	Port for the IoT webhook receiver stub (src/webhook/iot-receiver-server.js). Local/reverse-proxy only — do not expose publicly. Production requires a reverse proxy that terminates TLS and enforces real HMAC against IOT_WEBHOOK_SECRET.

API Reference

This server wraps the Guesty Open API. Authentication uses OAuth2 client credentials flow with automatic token caching, retry logic, and rate limit handling.

Built By

Built and run by a short-term rental operator on its own portfolio, shared with the STR community. Not affiliated with Guesty.

License

MIT