Web Tools
Create a small asynchronous application in just a few steps that monitors a website.
Open this playground in your coding agent and jump straight into practice.
Don't forget to connect the Knowledge.Dev MCP server to your agent first.
We'll build a practical site-monitoring CLI tool step by step. Starting from an empty Cargo project, we add an HTTP client, migrate to async with Tokio, introduce a polling loop with latency tracking, add resilient error handling, and finish with user-configurable command-line arguments via clap.
Along the way we cover core Rust concepts — crates, async/await, the Result type, pattern matching, and derive macros — in the context of a tool you can actually use.
Make HTTP requests with reqwest
Understand blocking vs async I/O in Rust
Use the Tokio runtime for async execution
Implement a periodic polling loop with timing
Handle errors gracefully with Result and match
Parse command-line arguments with clap derive
Basic Rust syntax (functions, variables, types)
Familiarity with Cargo and crate dependencies
