Skip to main content
Learn Claude Code

Learn Claude Code

Bash is All You Need

  • Every agent is a while loop that keeps calling the model until it says 'stop'.
  • Agent: One loop & Bash is all you need

One Handler Per Tool

Ruochen ChenApril 4, 2026About 1 minLearning RecordsNotes
Good MCP Server

Chrome DevTools MCP

Chrome DevTools MCP is a powerful browser automation tool that allows AI assistants to directly interact with Chrome browsers. Through this MCP server, AI can:

  • Web Automation: Automatically click, fill forms, navigate pages, and perform other operations
  • Performance Analysis: Analyze web performance metrics, including Core Web Vitals
  • Debugging Support: Get console messages and network request information
  • Screenshot Functionality: Capture screenshots of web pages or specific elements
  • Element Interaction: Hover, drag, upload files, and other interactive operations
Ruochen ChenOctober 23, 2025About 2 minLearning RecordsAI
Docker vs Podman
  • Purpose: Podman is a Docker-compatible, daemonless container engine focused on security and compatibility with OCI.
  • Security model: Rootless by default via user namespaces; works with SELinux/AppArmor; reduces blast radius compared to a rootful daemon.
  • Architecture: No central daemon; containers are regular processes managed by the user; integrates well with systemd (generate unit files, manage lifecycle).
  • Docker compatibility: Largely CLI-compatible; can run Docker images; podman build (powered by Buildah) supports Dockerfiles; optional Docker REST API socket for tooling compatibility.
  • Kubernetes integration: First-class pod concept; podman generate kube exports manifests; podman play kube runs manifests locally; smoother dev→K8s workflows.
  • Networking: Uses CNI plugins; rootless networking relies on slirp4netns (some port/MTU limitations); differs from Docker’s default bridge but offers comparable outcomes in most cases.
  • Storage: OCI image layout; OverlayFS where available, fuse-overlayfs for rootless; supports volumes and image management similar to Docker.
  • Compose: Supports podman-compose; with the Docker-compatible socket, many docker compose workflows can work, though features may vary by version.
  • Cross-platform: Native on Linux; macOS/Windows use Podman Machine (a lightweight VM), similar conceptually to Docker Desktop.
  • Performance: Lower overhead on Linux without a long-running daemon; on macOS/Windows performance depends on the backing VM.
  • Use cases: Security-conscious environments, rootless CI, local K8s-oriented development, and servers where a daemon is undesirable.
  • Limitations: No persistent daemon to auto-manage state; some rootless networking constraints; ecosystem around Compose and third-party tools can be uneven versus Docker.
Ruochen ChenOctober 3, 2025Less than 1 minuteLearning RecordsDocker
Information Visualisation (GEOM90007)

Week 1

Principles of Data Graphics

Data Density

  • Data density = Number of entries of data matrix / Available display area

Data Integrity

  1. Data scrubbing
  • Deliberately removing data or deriving data (smoothing/resampling) to create a false message
Ruochen ChenAugust 1, 2025Less than 1 minuteLearning RecordsUnimelb
Internship note

CI Tools

1. JaCoCo (Java Code Coverage)

Purpose: Code coverage analysis tool

  • Measures how much of your source code is exercised by your unit tests

  • Tracks:

    • Line coverage
    • Branch coverage
    • Method/class coverage

  • Generates visual HTML reports showing what parts of code are untested

Ruochen ChenJune 25, 2025Less than 1 minuteLearning RecordsJD
Machine Learning
Algorithm Type Generative/Discriminative Linear/Non-linear Notes
Naive Bayes Classification Generative Linear Assumes feature independence, uses Bayes' theorem
Logistic Regression Classification Discriminative Linear Uses sigmoid function, mainly for binary classification
Decision Trees Classification Discriminative Non-linear Handles both numerical and categorical features
SVM Classification Discriminative Linear/Non-linear Uses kernel trick for non-linear, finds optimal hyperplane
k-NN Classification Discriminative Non-linear Instance-based, sensitive to feature scaling
Neural Networks Classification Discriminative Non-linear Can model complex patterns, requires large datasets
Linear Regression Regression Discriminative Linear Predicts continuous values, sensitive to multicollinearity
k-Means Clustering - Linear Unsupervised, sensitive to initial centroids and outliers
PCA Dimensionality Reduction - Linear Unsupervised, maximizes variance, does not consider class labels
Hierarchical Clustering Clustering - Non-linear Unsupervised, builds nested clusters, linkage methods affect results
Perceptron Classification Discriminative Linear Simple model, only for linearly separable data
Multi-Layer Perceptron Classification/Regression Discriminative Non-linear Can solve XOR problem, uses backpropagation for training
Ruochen ChenJune 19, 2025About 31 minLearning RecordsUnimelb
Create MCP Server
# server.py
from mcp.server.fastmcp import FastMCP

# Create an MCP server
mcp = FastMCP("Demo")


# Add an addition tool
@mcp.tool()
def add(a: int, b: int) -> int:
    """Add two numbers"""
    return a + b


# Add a dynamic greeting resource
@mcp.resource("greeting://{name}")
def get_greeting(name: str) -> str:
    """Get a personalized greeting"""
    return f"Hello, {name}!"

if __name__ == "__main__":
    mcp.run(transport="stdio")
Ruochen ChenJune 5, 2025Less than 1 minuteLearning RecordsAI
Sealos

Sealos

  • Sealos is a container management platform that provides a unified interface for managing containerized applications, including application deployment, monitoring, logging, and alerting.
  • Sealos can connect projects to local IDEs for development and debugging.
  • Sealos can create virtual machines and deploy applications to them.
  • Sealos can manage the lifecycle of applications, including deployment, scaling, and deletion.
  • Sealos can provide a unified interface for managing containerized applications, including application deployment, monitoring, logging, and alerting.
Ruochen ChenMay 28, 2025Less than 1 minuteLearning RecordsProgrammer cliché
Collection of all tools

DigitalPlat

A digital platform typically used for enterprise digital transformation, integrating various business management and data analysis tools to improve operational efficiency.

NameSilo

A well-known domain registrar that provides domain registration, management, and transfer services, famous for transparent pricing and free privacy protection.

Ruochen ChenMay 8, 2025Less than 1 minuteLearning RecordsProgrammer cliché
Cloudflare

Practice

  • Sucessfully deployed Resume on Resume-EN and Resume-CN. The domain name is free from digitalplat, and used Workers and Pages in CloudFlare to deploy.
Ruochen ChenMay 7, 2025Less than 1 minuteLearning RecordsProgrammer cliché
Learning today, leading tomorrow
Copyright © 2026 Ruochen Chen