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Harrison Guo

Senior backend platform engineer. Distributed systems, Go runtime, LLM agent infrastructure. Writing deep-dive notes at harrisonsec.com

Location Vancouver, Canada Joined Joined on  Email address gzxharrison@gmail.com Personal website https://harrisonsec.com github website twitter website
Debugging a Real-Mode Bootloader in GDB — When CS Changes, Symbols Break
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Debugging a Real-Mode Bootloader in GDB — When CS Changes, Symbols Break

#assembly #debugging #osdev #c
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4 min read

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Building a Bootloader from Scratch — Just Assembly, No OS
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Building a Bootloader from Scratch — Just Assembly, No OS

#assembly #osdev #c #programming
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4 min read
Same Model, 13.3% to 38.3%
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Same Model, 13.3% to 38.3%

#ai #machinelearning #benchmarking #llm
Comments 4
7 min read
eBPF on Linux — kprobe vs fentry: Hooking Internals & What Production Observability Misses
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eBPF on Linux — kprobe vs fentry: Hooking Internals & What Production Observability Misses

#ebpf #linux #kernel #observability
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7 min read
The Approval Prompt Is Not the Sandbox
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The Approval Prompt Is Not the Sandbox

#security #ai #rust #programming
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6 min read
Three Agent Harnesses, One Loop
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Three Agent Harnesses, One Loop

#ai #architecture #opensource #programming
Comments 1
9 min read
Shamir Secret Sharing, Explained With Pictures
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Shamir Secret Sharing, Explained With Pictures

#shamir #cryptography #explainer #slip39
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7 min read
Your Model File Is Untrusted Input
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Your Model File Is Untrusted Input

#security #cpp #ai #opensource
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6 min read
Merged Is Not Shipped: Why a Year-Old Fix Never Reached You
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Merged Is Not Shipped: Why a Year-Old Fix Never Reached You

#devops #opensource #programming #softwareengineering
Comments
7 min read
The Log Printed Exactly What I Wanted. The Fix Was Still Wrong.
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The Log Printed Exactly What I Wanted. The Fix Was Still Wrong.

#debugging #ai #programming #softwareengineering
Comments
8 min read
Your VPN Is Fine. iOS Swapped the Address.
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Your VPN Is Fine. iOS Swapped the Address.

#networking #ios #debugging #tutorial
Comments
9 min read
Tool Calls Need Completion Ownership: Why Your Agent's 200 OK Lies
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Tool Calls Need Completion Ownership: Why Your Agent's 200 OK Lies

#ai #machinelearning #programming #architecture
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8 min read
Your AI Bill Is a Distributed Systems Problem, Not a Model-Pricing Problem
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Your AI Bill Is a Distributed Systems Problem, Not a Model-Pricing Problem

#ai #machinelearning #programming #architecture
Comments
7 min read
Validation Is a Loop, Not an Assertion: Why Your AI Agent Reports Success It Never Achieved
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Validation Is a Loop, Not an Assertion: Why Your AI Agent Reports Success It Never Achieved

#ai #machinelearning #programming #architecture
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8 min read
A Wrong Ruler Is Worse Than No Ruler: Verifying the Checks You Trust
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A Wrong Ruler Is Worse Than No Ruler: Verifying the Checks You Trust

#ai #machinelearning #programming #architecture
Comments
9 min read
Determinism Where You Can, Judgement Where You Must: The Technique Boundary for AI Systems
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Determinism Where You Can, Judgement Where You Must: The Technique Boundary for AI Systems

#ai #machinelearning #architecture #llm
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14 min read
Shrink the Stochastic Surface: A Design Standard for Probabilistic Systems
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Shrink the Stochastic Surface: A Design Standard for Probabilistic Systems

#ai #machinelearning #architecture #llm
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11 min read
Generative AI Builds Shapes, Not Games: The Constraint Gap and the Architecture That Closes It
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Generative AI Builds Shapes, Not Games: The Constraint Gap and the Architecture That Closes It

#ai #machinelearning #gamedev #programming
Comments
10 min read
I Tested Higgsfield's Minecraft Prompt-to-Build. It Generates Shapes, Not Scenes.
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I Tested Higgsfield's Minecraft Prompt-to-Build. It Generates Shapes, Not Scenes.

#ai #gamedev #machinelearning #review
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9 min read
Agent Architecture Is a Compute Allocation Problem: The Advisor Strategy, Cost-Curve Frame Recursed
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Agent Architecture Is a Compute Allocation Problem: The Advisor Strategy, Cost-Curve Frame Recursed

#ai #llm #programming #architecture
1
Comments
17 min read
Agent Retrieval Above the Crossover: A First-Principles Read of CodeGraph
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Agent Retrieval Above the Crossover: A First-Principles Read of CodeGraph

#ai #architecture #sqlite #programming
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20 min read
I Tested CodeGraph on Hono. The Tool-Call Savings Reproduce — the Cost Savings Don't.
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I Tested CodeGraph on Hono. The Tool-Call Savings Reproduce — the Cost Savings Don't.

#ai #benchmark #devtools #typescript
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13 min read
Agent Memory Is a Cache Coherence Problem
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Agent Memory Is a Cache Coherence Problem

#ai #memory #claudecode #programming
Comments 1
15 min read
Agent Retrieval Is a Cost Curve Problem: Why Claude Code Doesn't Use RAG
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Agent Retrieval Is a Cost Curve Problem: Why Claude Code Doesn't Use RAG

#ai #rag #claudecode #programming
1
Comments 3
21 min read
Channels Aren't Message Passing — How Parked Goroutines OOM-Killed a Pod
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Channels Aren't Message Passing — How Parked Goroutines OOM-Killed a Pod

#go #concurrency #performance #backend
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13 min read
How I Improved an AI Agent from 40% to 60% — With A/B Test Data
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How I Improved an AI Agent from 40% to 60% — With A/B Test Data

#agents #contextmanagement #engineering #testing
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5 min read
Consistency in Distributed Systems: Scenarios, Trade-offs, and What Actually Works
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Consistency in Distributed Systems: Scenarios, Trade-offs, and What Actually Works

#distributedsystems #consistency #saga #systemdesign
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11 min read
Don't Pick One AI. Run Three Against Each Other.
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Don't Pick One AI. Run Three Against Each Other.

#ai #aiagents #productivity #career
Comments
8 min read
Node Turns Waiting Into Events. Go Moves Context Switching Into User Space.
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Node Turns Waiting Into Events. Go Moves Context Switching Into User Space.

#go #node #concurrency #javascript
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13 min read
gRPC Interceptors in Production: Design Patterns That Survive Real Load
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gRPC Interceptors in Production: Design Patterns That Survive Real Load

#go #grpc #interceptors
Comments
8 min read
Go Generics, One Year In: Which Promises Held, Which Didn't
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Go Generics, One Year In: Which Promises Held, Which Didn't

#go #generics #typeparameters
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7 min read
Go Profiling in Anger: pprof, Escape Analysis, and Inlining Without Magic
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Go Profiling in Anger: pprof, Escape Analysis, and Inlining Without Magic

#go #performance #pprof
Comments
6 min read
sync.Pool in Go: When It Actually Helps, and When It Quietly Hurts
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sync.Pool in Go: When It Actually Helps, and When It Quietly Hurts

#go #performance #syncpool
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6 min read
IronSys: A Production Blueprint for Modern Concurrency
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IronSys: A Production Blueprint for Modern Concurrency

#concurrency #systemdesign #go #architecture
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8 min read
Docker Kubernetes: What They Really Changed (It's Not What You Think)
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Docker Kubernetes: What They Really Changed (It's Not What You Think)

#docker #kubernetes #containers #devops
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8 min read
Observability and Cost Attribution: Why One Pipeline Isn't Enough
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Observability and Cost Attribution: Why One Pipeline Isn't Enough

#observability #billing #costattribution #opentelemetry
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7 min read
The 90% Problem: Why Most AI Agents Are Still Broken
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The 90% Problem: Why Most AI Agents Are Still Broken

#agents #architecture #claudecode #openclaw
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7 min read
Testing Real-World Go Backends Isn't What Many People Think
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Testing Real-World Go Backends Isn't What Many People Think

#go #testing #backendengineering
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8 min read
Scale-Up vs Scale-Out: Why Every Language Wins Somewhere
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Scale-Up vs Scale-Out: Why Every Language Wins Somewhere

#programminglanguages #systemdesign #scale #rust
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7 min read
From Locks to Actors: The Four Pillars of Modern Concurrency
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From Locks to Actors: The Four Pillars of Modern Concurrency

#concurrency #systemdesign #go #erlang
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8 min read
RPC vs NATS: It's Not About Sync vs Async — It's About Who Owns Completion
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RPC vs NATS: It's Not About Sync vs Async — It's About Who Owns Completion

#distributedsystems #rpc #nats #grpc
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7 min read
Go Context in Distributed Systems: What Actually Works in Production
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Go Context in Distributed Systems: What Actually Works in Production

#go #context #concurrency
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8 min read
Go's Concurrency Is About Structure, Not Speed: chan and context as Lifecycle Primitives
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Go's Concurrency Is About Structure, Not Speed: chan and context as Lifecycle Primitives

#go #concurrency #channels
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8 min read
Why Go Handles Millions of Connections: User-Space Context Switching, Explained
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Why Go Handles Millions of Connections: User-Space Context Switching, Explained

#go #concurrency #distributedsystems
1
Comments
6 min read
Claude Code Deep Dive Part 4: Why It Uses Markdown Files Instead of Vector DBs
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Claude Code Deep Dive Part 4: Why It Uses Markdown Files Instead of Vector DBs

#claudecode #memory #agents #openclaw
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7 min read
Claude Code Deep Dive Part 3: The 5-Level Compression Pipeline Behind 1M Tokens
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Claude Code Deep Dive Part 3: The 5-Level Compression Pipeline Behind 1M Tokens

#claudecode #contextengineering #agents #compression
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8 min read
Claude Code + Codex Plugin: Two AI Brains, One Terminal
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Claude Code + Codex Plugin: Two AI Brains, One Terminal

#claudecode #codex #agents #openai
1
Comments
5 min read
Claude Code Deep Dive Part 2: The 1,421-Line While Loop That Runs Everything
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Claude Code Deep Dive Part 2: The 1,421-Line While Loop That Runs Everything

#claudecode #agents #architecture #systemdesign
1
Comments 1
7 min read
Claude Code Source Leaked: 5 Hidden Features Found in 510K Lines of Code
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Claude Code Source Leaked: 5 Hidden Features Found in 510K Lines of Code

#claudecode #anthropic #agents #security
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5 min read
The AI Stack Explained: LLM Talks, Program Walks
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The AI Stack Explained: LLM Talks, Program Walks

#ai #llm #mcp #agents
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6 min read
Why Your "Fail-Fast" Strategy is Killing Your Distributed System (and How to Fix It)
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Why Your "Fail-Fast" Strategy is Killing Your Distributed System (and How to Fix It)

#distributedsystems #redis #systemdesign #backend
1
Comments
9 min read
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