chore: bump version to 0.4.13

Adds the ability to test HTTP endpoint custom tools directly in the
editor, matching the existing test functionality for Python and
JavaScript tools. Closes #6.

backend/cmd/server/main.go

@@ -18,7 +18,7 @@ import (
 )
 
 // Version is set at build time via -ldflags, or defaults to dev
-var Version = "0.4.12"
+var Version = "0.4.13"
 
 func getEnvOrDefault(key, defaultValue string) string {
 	if value := os.Getenv(key); value != "" {

frontend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "vessel",
-  "version": "0.4.12",
+  "version": "0.4.13",
   "private": true,
   "type": "module",
   "scripts": {

frontend/src/lib/components/tools/ToolEditor.svelte

@@ -513,6 +513,29 @@ print(json.dumps(result))`;
 								</label>
 							</div>
 						</div>
+
+						<!-- Test button for HTTP -->
+						<button
+							type="button"
+							onclick={() => showTest = !showTest}
+							class="flex items-center gap-2 text-sm {showTest ? 'text-emerald-400' : 'text-theme-muted hover:text-theme-secondary'}"
+						>
+							<svg xmlns="http://www.w3.org/2000/svg" class="h-4 w-4" viewBox="0 0 20 20" fill="currentColor">
+								<path fill-rule="evenodd" d="M10 18a8 8 0 100-16 8 8 0 000 16zM9.555 7.168A1 1 0 008 8v4a1 1 0 001.555.832l3-2a1 1 0 000-1.664l-3-2z" clip-rule="evenodd" />
+							</svg>
+							{showTest ? 'Hide Test Panel' : 'Test Tool'}
+						</button>
+
+						<!-- Tool tester for HTTP -->
+						<ToolTester
+							{implementation}
+							code=""
+							{endpoint}
+							{httpMethod}
+							parameters={buildParameterSchema()}
+							isOpen={showTest}
+							onclose={() => showTest = false}
+						/>
 					</div>
 				{/if}
 

frontend/src/lib/components/tools/ToolTester.svelte

@@ -10,11 +10,13 @@
 		implementation: ToolImplementation;
 		code: string;
 		parameters: JSONSchema;
+		endpoint?: string;
+		httpMethod?: 'GET' | 'POST';
 		isOpen?: boolean;
 		onclose?: () => void;
 	}
 
-	const { implementation, code, parameters, isOpen = false, onclose }: Props = $props();
+	const { implementation, code, parameters, endpoint = '', httpMethod = 'POST', isOpen = false, onclose }: Props = $props();
 
 	let testInput = $state('{}');
 	let testResult = $state<{ success: boolean; result?: unknown; error?: string } | null>(null);
@@ -116,8 +118,54 @@
 						error: error instanceof Error ? error.message : String(error)
 					};
 				}
+			} else if (implementation === 'http') {
+				// HTTP endpoint execution
+				if (!endpoint.trim()) {
+					testResult = { success: false, error: 'HTTP endpoint URL is required' };
+					isRunning = false;
+					return;
+				}
+
+				try {
+					const url = new URL(endpoint);
+					const options: RequestInit = {
+						method: httpMethod,
+						headers: {
+							'Content-Type': 'application/json'
+						}
+					};
+
+					if (httpMethod === 'GET') {
+						// Add args as query parameters
+						for (const [key, value] of Object.entries(args)) {
+							url.searchParams.set(key, String(value));
+						}
+					} else {
+						options.body = JSON.stringify(args);
+					}
+
+					const response = await fetch(url.toString(), options);
+
+					if (!response.ok) {
+						testResult = {
+							success: false,
+							error: `HTTP ${response.status}: ${response.statusText}`
+						};
+					} else {
+						const contentType = response.headers.get('content-type');
+						const result = contentType?.includes('application/json')
+							? await response.json()
+							: await response.text();
+						testResult = { success: true, result };
+					}
+				} catch (error) {
+					testResult = {
+						success: false,
+						error: error instanceof Error ? error.message : String(error)
+					};
+				}
 			} else {
-				testResult = { success: false, error: 'HTTP tools cannot be tested in the editor' };
+				testResult = { success: false, error: 'Unknown implementation type' };
 			}
 		} finally {
 			isRunning = false;
@@ -169,7 +217,7 @@
 			<button
 				type="button"
 				onclick={runTest}
-				disabled={isRunning || !code.trim()}
+				disabled={isRunning || (implementation === 'http' ? !endpoint.trim() : !code.trim())}
 				class="flex items-center gap-2 px-3 py-1.5 text-sm font-medium rounded-lg bg-emerald-600 text-white hover:bg-emerald-500 disabled:opacity-50 disabled:cursor-not-allowed"
 			>
 				{#if isRunning}