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Support structuredContent in tool response (#147)

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Anandaroop Roy 2025-09-27 02:23:41 -04:00 • committed by GitHub
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@ -555,6 +555,38 @@ MCP spec for the [Output Schema](https://modelcontextprotocol.io/specification/2
The output schema follows standard JSON Schema format and helps ensure consistent data exchange between MCP servers and clients.
### Tool Responses with Structured Content
Tools can return structured data alongside text content using the `structured_content` parameter.
The structured content will be included in the JSON-RPC response as the `structuredContent` field.
```ruby
class APITool < MCP::Tool
description "Get current weather and return structured data"
def self.call(endpoint:, server_context:)
# Call weather API and structure the response
api_response = WeatherAPI.fetch(location, units)
weather_data = {
temperature: api_response.temp,
condition: api_response.description,
humidity: api_response.humidity_percent
}
output_schema.validate_result(weather_data)
MCP::Tool::Response.new(
[{
type: "text",
text: weather_data.to_json
}],
structured_content: weather_data
)
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.