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https://github.com/czlonkowski/n8n-mcp.git
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feat: MCP Apps - rich HTML UIs for tool results (#573)
* feat: add MCP Apps with rich HTML UIs for tool results Add MCP Apps infrastructure that allows MCP hosts like Claude Desktop to render rich HTML UIs alongside tool results via `_meta.ui` and the MCP resources protocol. - Server-side UI module (src/mcp/ui/) with UIAppRegistry, tool-to-UI mapping, and _meta.ui injection into tool responses - React + Vite build pipeline (ui-apps/) producing self-contained HTML per app using vite-plugin-singlefile - Operation Result UI for workflow CRUD tools (create, update, delete, test, autofix, deploy) - Validation Summary UI for validation tools (validate_node, validate_workflow, n8n_validate_workflow) - Shared component library (Card, Badge, Expandable) with n8n dark theme - MCP resources protocol support (ListResources, ReadResource handlers) - Graceful degradation when ui-apps/dist/ is not built - 22 unit tests across 3 test files Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * test: improve MCP Apps test coverage and add security hardening - Expand test suite from 22 to 57 tests across 3 test files - Add UIAppRegistry.reset() for proper test isolation between tests - Replace some fs mocks with real temp directory tests in registry - Add edge case coverage: empty strings, pre-load state, double load, malformed URIs, duplicate tool patterns, empty HTML files - Add regression tests for specific tool-to-UI mappings - Add URI format consistency validation across all configs - Improve _meta.ui injection tests with structuredContent coexistence - Coverage: statements 79.4% -> 80%, lines 79.4% -> 80% Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Romuald Członkowski
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GitHub
GitHub
parent
6814880410
commit
1f45cc6dcc
2
dist/mcp/server.d.ts.map
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dist/mcp/server.d.ts.map
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{"version":3,"file":"server.d.ts","sourceRoot":"","sources":["../../src/mcp/server.ts"],"names":[],"mappings":"AA0CA,OAAO,EAAE,eAAe,EAAE,MAAM,2BAA2B,CAAC;AAE5D,OAAO,EAAE,gBAAgB,EAAE,MAAM,iCAAiC,CAAC;AAmGnE,qBAAa,yBAAyB;IACpC,OAAO,CAAC,MAAM,CAAS;IACvB,OAAO,CAAC,EAAE,CAAgC;IAC1C,OAAO,CAAC,UAAU,CAA+B;IACjD,OAAO,CAAC,eAAe,CAAgC;IACvD,OAAO,CAAC,WAAW,CAAgB;IACnC,OAAO,CAAC,KAAK,CAAqB;IAClC,OAAO,CAAC,UAAU,CAAa;IAC/B,OAAO,CAAC,eAAe,CAAC,CAAkB;IAC1C,OAAO,CAAC,YAAY,CAAuB;IAC3C,OAAO,CAAC,qBAAqB,CAAsB;IACnD,OAAO,CAAC,WAAW,CAAiC;IACpD,OAAO,CAAC,kBAAkB,CAA4B;IACtD,OAAO,CAAC,iBAAiB,CAAkB;IAC3C,OAAO,CAAC,aAAa,CAAoC;IACzD,OAAO,CAAC,UAAU,CAAkB;gBAExB,eAAe,CAAC,EAAE,eAAe,EAAE,WAAW,CAAC,EAAE,gBAAgB;IAuGvE,KAAK,IAAI,OAAO,CAAC,IAAI,CAAC;YA+Cd,kBAAkB;YAiDlB,wBAAwB;IA0BtC,OAAO,CAAC,kBAAkB;YA6CZ,iBAAiB;IAa/B,OAAO,CAAC,eAAe,CAAkB;YAE3B,sBAAsB;IAgDpC,OAAO,CAAC,gBAAgB;IAqCxB,OAAO,CAAC,aAAa;IAmWrB,OAAO,CAAC,wBAAwB;IAoFhC,OAAO,CAAC,kBAAkB;IAqE1B,OAAO,CAAC,uBAAuB;IAwB/B,OAAO,CAAC,qBAAqB;YAoTf,SAAS;YA2DT,WAAW;YAkFX,WAAW;YA0CX,cAAc;YA8Md,gBAAgB;IAqD9B,OAAO,CAAC,mBAAmB;IAwE3B,OAAO,CAAC,eAAe;YAsBT,eAAe;IA2L7B,OAAO,CAAC,kBAAkB;IAQ1B,OAAO,CAAC,uBAAuB;IA0D/B,OAAO,CAAC,iBAAiB;YAqFX,WAAW;YAgCX,oBAAoB;IAuFlC,OAAO,CAAC,aAAa;YAQP,qBAAqB;YAwDrB,iBAAiB;YAiKjB,OAAO;YAgDP,cAAc;YAwFd,iBAAiB;IAqC/B,OAAO,CAAC,iBAAiB;IA0BzB,OAAO,CAAC,iBAAiB;IA0BzB,OAAO,CAAC,eAAe;IAwCvB,OAAO,CAAC,kBAAkB;IAiC1B,OAAO,CAAC,aAAa;IAoCrB,OAAO,CAAC,0BAA0B;IAgClC,OAAO,CAAC,4BAA4B;YAKtB,oBAAoB;IAsDlC,OAAO,CAAC,gBAAgB;YAiBV,SAAS;YA6CT,kBAAkB;YAqElB,uBAAuB;YAsDvB,iBAAiB;IAqE/B,OAAO,CAAC,qBAAqB;IA8C7B,OAAO,CAAC,uBAAuB;IA4D/B,OAAO,CAAC,wBAAwB;IAkChC,OAAO,CAAC,iBAAiB;YAoDX,mBAAmB;YAoEnB,qBAAqB;IAS7B,OAAO,CAAC,SAAS,EAAE,GAAG,GAAG,OAAO,CAAC,IAAI,CAAC;YAS9B,aAAa;YAcb,iBAAiB;YAoBjB,WAAW;YAwBX,eAAe;YAqBf,mBAAmB;YAwBnB,yBAAyB;IA4CvC,OAAO,CAAC,kBAAkB;YAiBZ,gBAAgB;YA6HhB,2BAA2B;YAiE3B,2BAA2B;IAyEnC,GAAG,IAAI,OAAO,CAAC,IAAI,CAAC;IA0BpB,QAAQ,IAAI,OAAO,CAAC,IAAI,CAAC;CAgEhC"}
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41
dist/mcp/server.js
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dist/mcp/server.js
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@@ -43,6 +43,7 @@ const types_js_1 = require("@modelcontextprotocol/sdk/types.js");
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const fs_1 = require("fs");
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const path_1 = __importDefault(require("path"));
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const tools_1 = require("./tools");
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const ui_1 = require("./ui");
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const tools_n8n_manager_1 = require("./tools-n8n-manager");
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const tools_n8n_friendly_1 = require("./tools-n8n-friendly");
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const workflow_examples_1 = require("./workflow-examples");
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@@ -148,8 +149,10 @@ class N8NDocumentationMCPServer {
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}, {
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capabilities: {
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tools: {},
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resources: {},
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},
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});
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ui_1.UIAppRegistry.load();
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this.setupHandlers();
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}
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async close() {
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@@ -368,6 +371,7 @@ class N8NDocumentationMCPServer {
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protocolVersion: negotiationResult.version,
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capabilities: {
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tools: {},
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resources: {},
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},
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serverInfo: {
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name: 'n8n-documentation-mcp',
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@@ -525,6 +529,10 @@ class N8NDocumentationMCPServer {
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if (name.startsWith('validate_') && structuredContent !== null) {
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mcpResponse.structuredContent = structuredContent;
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}
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const uiApp = ui_1.UIAppRegistry.getAppForTool(name);
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if (uiApp && uiApp.html) {
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mcpResponse._meta = { ui: { app: uiApp.config.uri } };
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}
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return mcpResponse;
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}
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catch (error) {
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@@ -562,6 +570,39 @@ class N8NDocumentationMCPServer {
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};
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}
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});
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this.server.setRequestHandler(types_js_1.ListResourcesRequestSchema, async () => {
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const apps = ui_1.UIAppRegistry.getAllApps();
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return {
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resources: apps
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.filter(app => app.html !== null)
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.map(app => ({
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uri: app.config.uri,
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name: app.config.displayName,
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description: app.config.description,
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mimeType: app.config.mimeType,
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})),
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};
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});
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this.server.setRequestHandler(types_js_1.ReadResourceRequestSchema, async (request) => {
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const uri = request.params.uri;
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const match = uri.match(/^n8n-mcp:\/\/ui\/(.+)$/);
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if (!match) {
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throw new Error(`Unknown resource URI: ${uri}`);
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}
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const app = ui_1.UIAppRegistry.getAppById(match[1]);
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if (!app || !app.html) {
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throw new Error(`UI app not found or not built: ${match[1]}`);
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}
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return {
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contents: [
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{
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uri: app.config.uri,
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mimeType: app.config.mimeType,
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text: app.html,
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},
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],
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};
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});
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}
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sanitizeValidationResult(result, toolName) {
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if (!result || typeof result !== 'object') {
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