Postbye
Cancel subscriptions: real cancellation letters & addresses for 10,000+ companies.
Should I use this
Quality & Safety
Findings (3)
- HIGHTool poisoning patterns detected
- MEDIUMTool 'get_cancellation_letter' description contains placeholder textin get_cancellation_letter
- INFOTool description contains placeholder or incomplete textin get_cancellation_letter
Based on automated analysis of tool definitions and protocol compliance.
Context Cost
This is the approximate number of tokens consumed each time the server's tools are loaded into a model's context. Higher counts reduce the attention available for other tasks.
Install
One-Click Install
Add this to your `claude_desktop_config.json` file:
{
"mcpServers": {
"postbye": {
"url": "https://postbye.com/mcp"
}
}
}Remote endpoints
https://postbye.com/mcpstreamable-httpWhat it can do
Tool inventory
Tools (4)
🟢search_companies(query, limit)
Find companies by name (for example "netflix" or "planet fitness") among the subscriptions and memberships Postbye has a cancellation guide for. Returns each match's slug, category, how the company takes cancellations and the guide URL. Use the slug with get_cancellation_guide.
Input Schema
{
"type": "object",
"properties": {
"query": {
"type": "string",
"minLength": 1,
"maxLength": 100,
"description": "Company or service name, or part of it."
},
"limit": {
"type": "integer",
"minimum": 1,
"maximum": 10,
"default": 5,
"description": "Maximum number of matches (1 to 10)."
}
},
"required": [
"query"
],
"additionalProperties": false
}🟢get_cancellation_guide(slug)
How to cancel one company's subscription or membership: how it takes cancellations, the notice period, the traps to check first, billing-partner notes, sources, when the facts were verified, the mailing address(es) on file and the guide and address page URLs. Accepts a company slug from search_companies (merged duplicate slugs resolve to the current one).
Input Schema
{
"type": "object",
"properties": {
"slug": {
"type": "string",
"minLength": 1,
"maxLength": 100,
"description": "Company slug, for example \"netflix\"."
}
},
"required": [
"slug"
],
"additionalProperties": false
}🟢get_cancellation_letter(slug, customer_name, account_number)
A plain-text cancellation letter for one company, built from the same template as Postbye's free letter tool, plus where to send it. Fields not supplied stay as [bracketed placeholders] to fill in. Nothing is stored.
Input Schema
{
"type": "object",
"properties": {
"slug": {
"type": "string",
"minLength": 1,
"maxLength": 100,
"description": "Company slug from search_companies."
},
"customer_name": {
"type": "string",
"maxLength": 100,
"description": "Your full name as it appears on the account (optional)."
},
"account_number": {
"type": "string",
"maxLength": 64,
"description": "Account, membership or reference number (optional)."
}
},
"required": [
"slug"
],
"additionalProperties": false
}🟢list_categories
The category hubs of the cancellation guides (streaming, gyms, phone and internet, insurance and more) with the number of guides in each and the hub URL.
Input Schema
{
"type": "object",
"properties": {},
"additionalProperties": false
}Community
Evidence