mcpapp-colorpicker

Provides a .NET Model Context Protocol (MCP) App with an interactive HTML color picker UI. Exposes an HTTP MCP endpoint at /mcp and a UI/resource endpoint for rendering the picker, with a tool named ColorPicker that accepts an optional initialColor (hex) and returns a result containing the UI resource URI to display.

Evaluated Mar 30, 2026 (21d ago)

Repo ↗ DevTools mcp mcp-app dotnet csharp color-picker ui aspnetcore http-transport sample

⚙ Agent Friendliness

/ 100

Can an agent use this?

🔒 Security

/ 100

Is it safe for agents?

⚡ Reliability

/ 100

Does it work consistently?

Score Breakdown

⚙ Agent Friendliness

MCP Quality

Documentation

Error Messages

Auth Simplicity

Rate Limits

🔒 Security

TLS Enforcement

Auth Strength

Scope Granularity

Dep. Hygiene

Secret Handling

TLS/auth are not described. The README suggests local HTTP and optionally exposing via ngrok, which may provide TLS externally but does not address transport security requirements for the app itself. No scope-based authorization or rate limiting/bot protection is documented.

⚡ Reliability

Uptime/SLA

Version Stability

Breaking Changes

Error Recovery

Best When

You want a lightweight, local/dev-friendly MCP UI tool for choosing a color interactively.

Avoid When

You need strong security guarantees (authn/authz, secrets management, abuse protection) or documented operational reliability (SLA, retry semantics, idempotency).

Use Cases

• Interactive selection of colors via an MCP tool UI
• Generating/choosing HEX colors for design workflows inside MCP-capable clients (e.g., VS Code extension)
• Demo/sample for building MCP Apps with .NET and AspNetCore tooling

Not For

• Production-grade design-system color services requiring persistence, user accounts, or auditability
• Use cases needing authenticated multi-tenant access control
• High-availability deployments where uptime/SLA and robust retry/idempotency guarantees are required

Interface

REST API

Yes

GraphQL

gRPC

MCP Server

Yes ↗

SDK

Yes

Webhooks

Authentication

OAuth: No Scopes: No

No authentication/authorization mechanism is described. The app runs locally (per README) and is reachable over HTTP; auth details are not documented.

Pricing

Free tier: No

Requires CC: No

Open-source sample (MIT). No pricing info provided.

Agent Metadata

Pagination

none

Idempotent

False

Retry Guidance

Not documented

Known Gotchas

⚠ No authentication details are provided; agents should assume unauthenticated access unless verified in code.
⚠ No retry/idempotency guidance is documented for the ColorPicker tool—avoid assuming safe retries for all interactions.
⚠ Rate limiting is not documented; if exposed publicly (e.g., via ngrok), agents should be prepared for potential throttling without guidance.

Alternatives

Build a custom web UI + REST endpoint and integrate it with an MCP server you control Use an existing MCP UI extension/sample pattern from the official Model Context Protocol apps repository Create a small local web app that returns selected HEX via a callback and integrate it with a client-side MCP tool flow

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API endpoint ↗ Agent guide ↗ Report inaccuracy

Scores are editorial opinions as of 2026-03-30.