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Create MCP App · awslabs | DecimalAI

agent toolingby awslabs

Create MCP App

awslabs/create-mcp-app

Source awslabs/cli-agent-orchestrator ↗License Apache-2.0

This skill should be used when the user asks to "create an MCP App", "add a UI to an MCP tool", "build an interactive MCP View", "scaffold an MCP App", or needs guidance on MCP Apps SDK patterns, UI-resource registration, MCP App lifecycle, or host integration. Provides comprehensive guidance for building MCP Apps with interactive UIs.

SkillScore95Maintained

Automatic

AI Engineer pack

Last verified 8/14/2026

What it changes

Passed 21 of 22 test cases with the skill, and 9 of 22 without it.

Without skill41%

With skill95%

Checks it passed that the model alone missed

Logs debug messages using app.sendLog.
Uses standard McpServer from the core MCP SDK.
Identifies type definitions inside src/spec.types.ts.

and 11 more in the full report

12 fixed9 passed either way1 still failing0 broke

Pass-rate lift: +55 pp
Tokens: +43%
Agent turns: 0%
Response time: -46%

Model gemini-3.6-flashMeasured 8/14/2026v121 of 22 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/awslabs-create-mcp-app/SKILL.md https://app.decimal.ai/s/awslabs-create-mcp-app/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add awslabs-create-mcp-app, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/awslabs-create-mcp-app/ and pins it in .decimal/skills.lock

decimalai skills add awslabs-create-mcp-app

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/awslabs-create-mcp-app/SKILL.md https://app.decimal.ai/s/awslabs-create-mcp-app/SKILL.md

Raw file: /s/awslabs-create-mcp-app/SKILL.md ↗ · machine-readable summary at /s/awslabs-create-mcp-app.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 12 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 12

Prompt

I need to clone the official MCP embedded apps repository locally to inspect framework templates and source code. What exact git command and branch argument should I execute?

What was checked, without and with the skill
Checked	Without skill	With skill
Executes git clone referencing the package version retrieved from npm view.	Missed	Passed

case-13 · gemini-3.6-flash · 8/14/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md179 linessingle file

Create MCP App

Build interactive UIs that run inside MCP-enabled hosts like Claude Desktop. An MCP App combines an MCP tool with an HTML resource to display rich, interactive content.

Core Concept: Tool + Resource

Every MCP App requires two parts linked together:

Tool - Called by the LLM/host, returns data
Resource - Serves the bundled HTML UI that displays the data

The tool's _meta.ui.resourceUri references the resource's URI.

Host calls tool → Host renders resource UI → Server returns result → UI receives result.

Quick Start Decision Tree

Framework Selection

Framework	SDK Support	Best For
React	`useApp` hook provided	Teams familiar with React
Vanilla JS	Manual lifecycle	Simple apps, no build complexity
Vue/Svelte/Preact/Solid	Manual lifecycle	Framework preference

Project Context

Adding to existing MCP server:

Import registerAppTool, registerAppResource from SDK
Add tool registration with _meta.ui.resourceUri
Add resource registration serving bundled HTML

Creating new MCP server:

Set up server with transport (stdio or HTTP)
Register tools and resources
Configure build system with vite-plugin-singlefile

Getting Reference Code

Clone the SDK repository for working examples and API documentation:

Track record

Benchmark

21 / 22

test cases passed, vs 9 / 22 without

Adoption

Users: 1
Times used: 14

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

awslabs / cli-agent-orchestrator

skills/vendor/ext-apps/create-mcp-app/SKILL.md

View on GitHub ↗

License Apache-2.0Imported 8/3/2026Version v1

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Ready to supercharge your AI agents?

See it in action

What's inside

Create MCP App

Core Concept: Tool + Resource

Quick Start Decision Tree

Framework Selection

Project Context

Getting Reference Code

Track record

Benchmark

Adoption

SkillSafety

Source

Other skills for the same job

Related skills