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Add Resource Template support to basic-host #296

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Add Resource Template support to basic-host #296

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23 changes: 20 additions & 3 deletions examples/basic-host/src/implementation.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -60,11 +60,21 @@ export function hasAppHtml(toolCallInfo: ToolCallInfo): toolCallInfo is Required
}


export function callTool(
/**
* Resolves URI template parameters like {param} with values from structuredContent
*/
function resolveUriParameters(uriTemplate: string, structuredContent: Record<string, unknown>): string {
return uriTemplate.replace(/\{(\w+)\}/g, (match, paramName) => {
const value = structuredContent[paramName];
return value !== undefined ? String(value) : match;
});
}

export async function callTool(
serverInfo: ServerInfo,
name: string,
input: Record<string, unknown>,
): ToolCallInfo {
): Promise<ToolCallInfo> {
log.info("Calling tool", name, "with input", input);
const resultPromise = serverInfo.client.callTool({ name, arguments: input }) as Promise<CallToolResult>;

Expand All @@ -74,10 +84,17 @@ export function callTool(
}

const toolCallInfo: ToolCallInfo = { serverInfo, tool, input, resultPromise };
let result = await resultPromise;

const uiResourceUri = getToolUiResourceUri(tool);
if (uiResourceUri) {
toolCallInfo.appResourcePromise = getUiResource(serverInfo, uiResourceUri);
// Replace URL parameters with values from structuredContent
let resolvedUri = uiResourceUri;
if (result.structuredContent && typeof result.structuredContent === 'object') {
resolvedUri = resolveUriParameters(uiResourceUri, result.structuredContent);
log.info(`Resolved URI: ${uiResourceUri} -> ${resolvedUri}`);
}
toolCallInfo.appResourcePromise = getUiResource(serverInfo, resolvedUri);
}

return toolCallInfo;
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6 changes: 3 additions & 3 deletions examples/basic-host/src/index.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -160,12 +160,12 @@ function CallToolPanel({ serversPromise, addToolCall, initialServer, initialTool
};

// Submit with optional override for server/tool (used by auto-call)
const handleSubmit = (overrideServer?: ServerInfo, overrideTool?: string) => {
const handleSubmit = async (overrideServer?: ServerInfo, overrideTool?: string) => {
const server = overrideServer ?? selectedServer;
const tool = overrideTool ?? selectedTool;
if (!server) return;

const toolCallInfo = callTool(server, tool, JSON.parse(inputJson));
const toolCallInfo = await callTool(server, tool, JSON.parse(inputJson));
addToolCall(toolCallInfo);

// Update URL for easy refresh/sharing (without triggering navigation)
Expand All @@ -178,7 +178,7 @@ function CallToolPanel({ serversPromise, addToolCall, initialServer, initialTool

return (
<div className={styles.callToolPanel}>
<form onSubmit={(e) => { e.preventDefault(); handleSubmit(); }}>
<form onSubmit={async (e) => { e.preventDefault(); await handleSubmit(); }}>
<label>
Server
<Suspense fallback={<select disabled><option>Loading...</option></select>}>
Expand Down