How to use Resource templates properly? #855

There is no request.getTemplateVariable(...) API on ReadResourceRequest; the request deliberately carries the concrete URI only. The SDK uses the template internally to select the registered handler, but it passes the original request to that handler.

You can use the SDK's URI-template manager instead of parsing the string manually:

var template = "file:///{path}";
var uriTemplate = new DefaultMcpUriTemplateManager(template);

var spec = new McpServerFeatures.SyncResourceTemplateSpecification(
    new McpSchema.ResourceTemplate(template, "file", null, null),
    (exchange, request) -> {
        var variables = uriTemplate.extractVariableValues(request.uri());
        var path = variables.get("path");
        // build and return ReadResourceResult using path
    }
);

For production code, construct the manager once with the specification rather than once per read. extractVariableValues validates the URI against the template and returns a map keyed by the template variable names, so in your example variables.get("path") is the direct equivalent you were looking for.

Relevant SDK API: McpUriTemplateManager.extractVariableValues.