Bobby Hall Jr

Software engineer (8 years experience) building AI systems, engineering intelligence, and self-improving agents. Writing about graphs, agents, ML, and the future of software development.

Joined on Dec 4, 2020 bobbyhalljrcs@gmail.com https://bhjr.dev

Education

Bloom Institute of Technology

Pronouns

He/Him

Pinned

Bobby Hall Jr

Apr 27 '25

Building a Dynamic Prompt Engine for an AI SaaS - TaxJoy (Next.js + Vercel AI SDK)

#ai #saas #programming #nextjs

3 min read

Bobby Hall Jr

Jun 6 '23

Mastering Promises in JavaScript: A Comprehensive Guide

#javascript #tutorial #beginners #frontend

7 min read

Bobby Hall Jr

Oct 14

Workday Is Buying Identity for AI Agents. Let's Build a Tiny Access Grant in TypeScript.

#ai #typescript #security #agents

14 min read

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Bobby Hall Jr

Oct 13

Google Launched Gemini 4 Argon. Let's Build a Tiny Continuation Loop in TypeScript.

#ai #typescript #llm #gemini

12 min read

Bobby Hall Jr

Oct 13

Cloudflare Gave Agents a Browser That Remembers. Let's Build a Tiny Session Keeper in TypeScript.

#ai #typescript #agents #webdev

10 min read

Bobby Hall Jr

Oct 13

Anthropic Opened Claude Code Projects. Let's Build a Tiny Project Coordinator in TypeScript.

#ai #typescript #agents #llm

8 min read

Bobby Hall Jr

Oct 13

AlphaSense Launched SuperAnalyst. Let's Build a Tiny Assumption Watcher in TypeScript.

#ai #typescript #agents #llm

6 min read

Bobby Hall Jr

Oct 13

Google Launched the Gemini Agent. Let's Build a Tiny Model Router in TypeScript.

#ai #typescript #agents #llm

7 min read

Bobby Hall Jr

Oct 12

Meta Launched Muse Wonder. Let's Build a Tiny Active Focus Loop in TypeScript.

#ai #typescript #agents #llm

9 min read

Bobby Hall Jr

Oct 12

Your Agent Hit the Real Web. Build a Tiny Side-Effect Confirm Gate in TypeScript.

#ai #typescript #agents #security

9 min read

Bobby Hall Jr

Oct 12

Anthropic Launched Dynamic Workflows. Let's Build a Tiny Fan-Out Budget in TypeScript.

#ai #typescript #agents #anthropic

10 min read

Bobby Hall Jr

Oct 12

Your Model Just Invented a Form. Build a Tiny UI Component Gate in TypeScript.

#ai #typescript #llm #machinelearning

9 min read

Bobby Hall Jr

Oct 11

Sierra Shared Personal Agent Protocol. Build a Tiny Discovery Gate in TypeScript.

#ai #agents #typescript #architecture

10 min read

Bobby Hall Jr

Oct 11

Polly Leaked the Secret. Build a Tiny Three-Layer Guard in TypeScript.

#ai #typescript #security #agents

11 min read

Bobby Hall Jr

Oct 11

Your Structured Output Passed Once. Build a Tiny Schema Gate in TypeScript.

#ai #typescript #llm #machinelearning

9 min read

Bobby Hall Jr

Oct 11

How to Give an AI Agent Persistent Memory Using Supabase

#ai #typescript #supabase #tutorial

9 min read

Bobby Hall Jr

Oct 10

Your Agent Bought a Tool. Who Got Your Data?

#ai #typescript #security #tutorial

6 min read

Bobby Hall Jr

Oct 10

Your Agent's Budget Check Has a Race Condition. Build a Reservation Ledger in TypeScript.

#ai #typescript #tutorial #agents

4 min read

Bobby Hall Jr

Oct 10

Your Agent Picked a Chart. Did the Data Deserve One? Build a UI Planner in TypeScript.

#ai #typescript #webdev #tutorial

4 min read

Bobby Hall Jr

Oct 10

Your JSON Is Valid. Your Invoice Is Wrong. Build a Semantic Gate in TypeScript.

#ai #typescript #tutorial #webdev

4 min read

Bobby Hall Jr

Oct 9

Your Agent Got Approval. Then It Changed the Email. Build a Payload-Bound Gate in TypeScript.

#ai #typescript #security #tutorial

7 min read

Bobby Hall Jr

Oct 9

Your LLM Cache Key Is Missing Half the Request. Build a Versioned Cache in TypeScript.

#ai #typescript #tutorial #security

5 min read

Bobby Hall Jr

Oct 8

Claude Haiku 5.5 Is Cheap Until 100k Tokens. Build a Tiny Price Gate in TypeScript.

#typescript #ai #anthropic

10 min read

Bobby Hall Jr

Oct 8

Your RAG Filter Runs Too Late. Build a Tenant-Safe Retriever in TypeScript.

#typescript #ai #rag #security

6 min read

Bobby Hall Jr

Oct 7

OpenAI’s Decisions API Is in Public Beta. Build a Typed Router in TypeScript.

#ai #typescript #openai #tutorial

6 min read

Bobby Hall Jr

Oct 7

Your Model Says 90%. Build a Tiny Calibration Check in TypeScript.

#ai #machinelearning #typescript #tutorial

7 min read

Bobby Hall Jr

Oct 6

OpenAI Started Watermarking ChatGPT Text. Build a Tiny Text Watermark in TypeScript.

#ai #typescript #llm #machinelearning

12 min read

Bobby Hall Jr

Oct 6

Your Agents Trust Each Other. Build a Tiny Delegation Guard in TypeScript.

#ai #typescript #agents #security

11 min read

Bobby Hall Jr

Oct 5

Your Agent Rereads Every Tool Result. Build a Tiny Context Compactor in TypeScript.

#ai #typescript #agents #llm

10 min read

Bobby Hall Jr

Oct 5

Don't Switch Embedding Models on Vibes. Build a Tiny Retrieval Eval in TypeScript.

#ai #machinelearning #typescript #rag

10 min read

Bobby Hall Jr

Oct 5

Anthropic Launched Mods for Claude Code. Let's Build a Tiny One in TypeScript.

#ai #typescript #agents #anthropic

7 min read

Bobby Hall Jr

Oct 5

Passing Tests Is a Terrible Reward. Build a Reward Hacking Detector in TypeScript.

#ai #machinelearning #typescript #agents

9 min read

Bobby Hall Jr

Oct 4

Your Agent Sandbox Blocklist Is Already Lost. Build a Default-Deny Egress Policy in TypeScript.

#ai #agents #typescript #security

10 min read

Bobby Hall Jr

Oct 4

Patching the MCP SDK Doesn't Fix It. Pin the OAuth Issuer in TypeScript.

#ai #mcp #typescript #security

10 min read

Bobby Hall Jr

Oct 4

Your Agent's Allowlist Is a Parser Bug: Build a Shell Command Gate in TypeScript

#ai #agents #typescript #security

9 min read

Bobby Hall Jr

Oct 4

Stop Trusting Your Agent's Final Answer: Build a Tiny Agent Tracer in TypeScript

#ai #agents #typescript #observability

11 min read

Bobby Hall Jr

Oct 4

One Email Hijacked an AI Agent. Build a Tiny Prompt Injection Gate in TypeScript.

#ai #agents #typescript #security

10 min read

Bobby Hall Jr

Oct 4

A Timeout Is Not a Failure: Build Idempotent Tool Calls for AI Agents in TypeScript

#ai #agents #typescript #reliability

9 min read

Bobby Hall Jr

Oct 4

OpenAI Launched Space. Let's Build a Tiny Shared Workspace in TypeScript.

#ai #agents #typescript #architecture

9 min read

Bobby Hall Jr

Oct 3

Your Model Upgrade Is a Breaking Change: Build Contract Tests for LLM Providers in TypeScript

#ai #typescript #testing #llm

9 min read

Bobby Hall Jr

Oct 2

Cloudflare Launched Clef. Let's Build a Tiny Decision Gate in TypeScript.

#ai #typescript #machinelearning #tutorial

9 min read

Bobby Hall Jr

Sep 30

Evals for Agents: Did It Stay in Scope? Build a Tiny One in TypeScript

#ai #agents #typescript #testing

8 min read

Bobby Hall Jr

Sep 30

OpenAI Launched Dots. Let's Build a Tiny One in TypeScript.

#ai #agents #typescript #architecture

9 min read

Bobby Hall Jr

Sep 30

Cost per Task, Not Cost per Token: Build an LLM Cost Calculator in TypeScript

#ai #typescript #llm #machinelearning

10 min read

Bobby Hall Jr

Sep 30

What Is an Agent Harness? Build a Tiny One in TypeScript

#ai #agents #typescript #architecture

12 min read

Bobby Hall Jr

Sep 20

You Can't Give an AI a Job Until It Has a Lane

#ai #agents #softwareengineering #architecture

3 min read

Bobby Hall Jr

Sep 19

The Computer Is Becoming an API for AI

#agents #ai #automation

8 min read

Bobby Hall Jr

Aug 31

I Let Grok Bot Apply to Software Engineering Jobs While I Was Sleeping

#ai #grokbot #webdev #automation

7 min read

Bobby Hall Jr

Aug 30

Your Code Knows What Changed. But Does It Know Why?

#ai #programming

7 min read

Bobby Hall Jr

Aug 28

How to Build an AI Employee With a Knowledge Graph (Not Just Another Agent)

#ai #agents #knowledgegraph #typescript

5 min read

Bobby Hall Jr

Aug 26

The Graph That Learns: Building Self-Improving Agent Loops

#ai #webdev #tutorial #typescript

11 min read

Bobby Hall Jr

Aug 24

Build a Mini Engineering Graph With TypeScript and GitHub

#typescript #github #ai #webdev

16 min read

Bobby Hall Jr

Aug 21

Graph Engineering: The Missing Architecture Behind Useful AI

#ai #graph #rag #typescript

11 min read

Bobby Hall Jr

Mar 12 '25

Mastering OpenAI’s new Agents SDK & Responses API [Part 1]

#webdev #powerfuldevs #ai #openai

4 min read

Bobby Hall Jr

Feb 17 '25

Building an AI Agent with LangGraph, TypeScript, Next.js, TailwindCSS, and Pinecone – Part 2

3 min read

Bobby Hall Jr

Feb 16 '25

Building an AI Agent with LangGraph, TypeScript, Next.js, TailwindCSS, and Pinecone

3 min read

Bobby Hall Jr

Dec 3 '24

Random Image Generation and Caching in JavaScript

#javascript #tutorial #frontend #backend

3 min read

Bobby Hall Jr

Jan 8 '24

The Psychology Behind UI Design: Crafting Engaging User Experiences (Part 2)

3 min read

Bobby Hall Jr

Jan 7 '24

Mastering UI Psychology: A Technical Deep Dive with React, TypeScript, and Tailwind CSS

3 min read

Bobby Hall Jr

Jan 6 '24

The Psychology Behind UI Design: Crafting Engaging User Experiences

#uipsychology #tutorial #learning #frontend

3 min read

Bobby Hall Jr

Jun 13 '23

TypeScript Interfaces: Embrace the Flexibility - With Challenges

#typescript #javascript #webdev #beginners

3 min read

Bobby Hall Jr

Jun 10 '23

Classes in TypeScript: With Challenges

#typescript #javascript #tutorial #beginners

4 min read