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Rename APITool to WeatherTool and add error handling

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Updated the APITool class to WeatherTool and modified method parameters. Added section on tool responses with errors.
This commit is contained in:
Guillaume Briday 2025-12-09 20:09:42 +01:00 • committed by GitHub
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@ -597,10 +597,10 @@ Tools can return structured data alongside text content using the `structured_co
The structured content will be included in the JSON-RPC response as the `structuredContent` field.
```ruby
class APITool < MCP::Tool
class WeatherTool < MCP::Tool
description "Get current weather and return structured data"
def self.call(endpoint:, server_context:)
def self.call(location:, units: "celsius", server_context:)
# Call weather API and structure the response
api_response = WeatherAPI.fetch(location, units)
weather_data = {
@ -622,6 +622,32 @@ class APITool < MCP::Tool
end
```
### Tool Responses with Errors
Tools can return error information alongside text content using the `error` parameter.
The error will be included in the JSON-RPC response as the `isError` field.
```ruby
class WeatherTool < MCP::Tool
description "Get current weather and return structured data"
def self.call(server_context:)
# Do something here
content = {}
MCP::Tool::Response.new(
[{
type: "text",
text: content.to_json
}],
structured_content: content,
error: true
)
end
end
```
### Prompts
MCP spec includes [Prompts](https://modelcontextprotocol.io/specification/2025-06-18/server/prompts), which enable servers to define reusable prompt templates and workflows that clients can easily surface to users and LLMs.