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Ken Imoto

WebRTC & Voice AI Engineer at Propel-Lab. I run AI agents, Claude Code and MCP in production and publish the numbers. 9 Kindle books incl. "Practical Claude Code". 350k+ views on Qiita & Zenn.

Location Fukuoka, Japan Joined Joined on  Personal website https://kenimoto.dev/ github website twitter website

Education

Kyushu Institute of Technology

Work

Software Engineer | WebRTC & Voice AI Engineer at Propel-Lab LLC

CodeRabbit autoFix + Biome pre-commit: The 2-Layer Split That Stops Nitpick Round-Trips
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CodeRabbit autoFix + Biome pre-commit: The 2-Layer Split That Stops Nitpick Round-Trips

#devops #codereview #productivity #opensource
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6 min read

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Prompt Engineering Is Dead. Long Live Harness Engineering.
kenimo49 profile

Prompt Engineering Is Dead. Long Live Harness Engineering.

#ai #agentengineering #claudecode #prompt
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7 min read
I Replaced grep-Based Code Review with a Knowledge Graph + MCP. Here Are 3 Bugs Vector Search Missed.
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I Replaced grep-Based Code Review with a Knowledge Graph + MCP. Here Are 3 Bugs Vector Search Missed.

#ai #mcp #codereview #knowledgegraph
Comments 1
7 min read
Tavily vs Exa vs Brave Search: I Ran 100 Agentic-RAG Queries Through All Three
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Tavily vs Exa vs Brave Search: I Ran 100 Agentic-RAG Queries Through All Three

#ai #productivity #devtools #webdev
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6 min read
6 CLAUDE.md Patterns That Kept Shared Context From Breaking When PR Volume Outran Review
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6 CLAUDE.md Patterns That Kept Shared Context From Breaking When PR Volume Outran Review

#claudecode #ai #teamwork #git
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8 min read
Claude Code Hooks Fire in 8 Places: The Agent Lifecycle Diagram Anthropic Never Shipped
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Claude Code Hooks Fire in 8 Places: The Agent Lifecycle Diagram Anthropic Never Shipped

#claudecode #devops #productivity #hooks
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8 min read
Zero of 7 Services Support File Upload Through MCP. Here's What Actually Works.
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Zero of 7 Services Support File Upload Through MCP. Here's What Actually Works.

#mcp #ai #claude #security
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7 min read
LangChain Says Agent = Model + Harness. Here's What Broke in My Agent When I Skipped the Harness.
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LangChain Says Agent = Model + Harness. Here's What Broke in My Agent When I Skipped the Harness.

#langchain #ai #agents #python
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6 min read
5 LLMs Answered the Same Question About a Tool That Doesn't Exist. The Quality Varied 4.6x.
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5 LLMs Answered the Same Question About a Tool That Doesn't Exist. The Quality Varied 4.6x.

#ai #llm #claude #openai
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6 min read
I tried to stop paying $2.99 per backing track. The transcription worked; the accompaniment never did
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I tried to stop paying $2.99 per backing track. The transcription worked; the accompaniment never did

#machinelearning #python #audio #opensource
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7 min read
Conventional Comments: 5 Prefixes Cut My AI-Assisted PR Loops From 4.5 Rounds to 1.8
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Conventional Comments: 5 Prefixes Cut My AI-Assisted PR Loops From 4.5 Rounds to 1.8

#codereview #ai #github #productivity
Comments
5 min read
Whisper + Deepgram + Piper: I Parallelized a Voice AI Pipeline and Cut Latency From 1,200ms to 340ms
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Whisper + Deepgram + Piper: I Parallelized a Voice AI Pipeline and Cut Latency From 1,200ms to 340ms

#voiceai #webrtc #ai #python
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6 min read
Qwen Code vs Aider vs OpenCode: I Ran the Same 12 Tasks Through 3 Local CLI Agents on One RTX 4070
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Qwen Code vs Aider vs OpenCode: I Ran the Same 12 Tasks Through 3 Local CLI Agents on One RTX 4070

#llm #ai #python #productivity
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6 min read
Framer Motion + View Transitions API: 4 UI Motion Patterns That Stop Looking AI-Generated
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Framer Motion + View Transitions API: 4 UI Motion Patterns That Stop Looking AI-Generated

#webdev #css #react #frontend
Comments 1
7 min read
⚠️ Shai-Hulud opens your IDE: the npm worm that beats --ignore-scripts
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⚠️ Shai-Hulud opens your IDE: the npm worm that beats --ignore-scripts

#security #npm #javascript #devsecops
2
Comments
6 min read
nanochat + GRPO: I Read Karpathy's 300-Line RL Loop So You Don't Have To
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nanochat + GRPO: I Read Karpathy's 300-Line RL Loop So You Don't Have To

#machinelearning #ai #python #llm
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6 min read
Claude Code + 300 Docs: I Built a Personal Knowledge DB With 4 Retrieval Layers. 3 Broke.
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Claude Code + 300 Docs: I Built a Personal Knowledge DB With 4 Retrieval Layers. 3 Broke.

#claude #ai #productivity #webdev
Comments
8 min read
Alexa vs Siri vs Google Assistant: 3 Voice UX Tricks I Stole for My Sub-300ms Agent
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Alexa vs Siri vs Google Assistant: 3 Voice UX Tricks I Stole for My Sub-300ms Agent

#voiceai #ai #ux #mobile
Comments
7 min read
Cursor 2.0 Composer vs Claude Code /agents: 4 Refactor Tasks Timed on the Same Next.js Repo
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Cursor 2.0 Composer vs Claude Code /agents: 4 Refactor Tasks Timed on the Same Next.js Repo

#ai #nextjs #productivity #typescript
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6 min read
3 Layers of Code Review on Next.js + TypeScript: I Cut Human Review Time From 4h to 25min per PR
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3 Layers of Code Review on Next.js + TypeScript: I Cut Human Review Time From 4h to 25min per PR

#nextjs #typescript #codereview #ai
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5 min read
KV Cache Quantization: I Stretched Qwen 35B's Context 8 on 12GB VRAM
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KV Cache Quantization: I Stretched Qwen 35B's Context 8 on 12GB VRAM

#llm #ai #gpu #performance
1
Comments 1
3 min read
The AI Summary Said "It's Not a Scam." The Springboard Was Your Site's Search Box
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The AI Summary Said "It's Not a Scam." The Springboard Was Your Site's Search Box

#security #seo #ai #webdev
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6 min read
freee + MCP: I Automated My Japanese Tax Return With Claude Code — 3 Things That Broke in Production
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freee + MCP: I Automated My Japanese Tax Return With Claude Code — 3 Things That Broke in Production

#mcp #ai #claude #automation
1
Comments 2
4 min read
Playwright + Chromium: 1 Script Replaces 2 Manual Testers for WebRTC Video Call E2E
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Playwright + Chromium: 1 Script Replaces 2 Manual Testers for WebRTC Video Call E2E

#playwright #webrtc #testing #typescript
Comments 1
7 min read
MCP Scorecard: 4-Layer Pre-flight Check Before You Publish a Server
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MCP Scorecard: 4-Layer Pre-flight Check Before You Publish a Server

#mcp #ai #claudecode #security
Comments 2
9 min read
MCP Token Cost Audit: PostgreSQL vs Google Maps vs GitHub vs Freee — 270 Tools Priced
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MCP Token Cost Audit: PostgreSQL vs Google Maps vs GitHub vs Freee — 270 Tools Priced

#mcp #security #tokens #ai
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7 min read
OpenAI Codex Shipped 1M Lines From AGENTS.md: 3 Harness Lessons That Beat Model Swaps
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OpenAI Codex Shipped 1M Lines From AGENTS.md: 3 Harness Lessons That Beat Model Swaps

#openai #codex #ai #agents
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5 min read
SQLite vs Kuzu vs Neo4j: Which Graph DB Survives 1M Code Nodes?
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SQLite vs Kuzu vs Neo4j: Which Graph DB Survives 1M Code Nodes?

#database #performance #ai #codereview
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6 min read
The Machine Accent Travels: AI Text Is Rhythmically Monotone in 70/70 Cells Across 3 Languages
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The Machine Accent Travels: AI Text Is Rhythmically Monotone in 70/70 Cells Across 3 Languages

#ai #llm #writing #research
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5 min read
Brave Search Buries Pages Google Ranks #1, and Your AI Agents Can't Find Them
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Brave Search Buries Pages Google Ranks #1, and Your AI Agents Can't Find Them

#llmo #bravesearch #ai #seo
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7 min read
Claude Code Made My Sprints 40% Slower: 3 Time Sinks I Only Found by Timing Myself
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Claude Code Made My Sprints 40% Slower: 3 Time Sinks I Only Found by Timing Myself

#claudecode #ai #productivity #devops
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7 min read
Whisper v3 Turbo + Qwen2.5 1.5B: 5 Ollama Models Benchmarked for Sub-300ms Voice AI on CPU
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Whisper v3 Turbo + Qwen2.5 1.5B: 5 Ollama Models Benchmarked for Sub-300ms Voice AI on CPU

#voiceai #whisper #ollama #edgeai
5
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6 min read
Claude Code Review Blast Radius: Token Bill Dropped 8-49x With a Tree-sitter Graph
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Claude Code Review Blast Radius: Token Bill Dropped 8-49x With a Tree-sitter Graph

#claudecode #codereview #treesitter #tokens
1
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7 min read
Claude Code vs Cursor: 6 Tasks Timed, One I Uninstalled After 14 Days
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Claude Code vs Cursor: 6 Tasks Timed, One I Uninstalled After 14 Days

#claudecode #cursor #ai #productivity
1
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7 min read
I Forked OpenCut classic to Put an MCP Server on It — Four Traps I Hit Before Claude Could Drive the Video Editor
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I Forked OpenCut classic to Put an MCP Server on It — Four Traps I Hit Before Claude Could Drive the Video Editor

#mcp #opencut #videoeditor #playwright
1
Comments
7 min read
Ubuntu 22.04 Made hashcat 1,000x Slower: Inside the yescrypt Switch That Broke Password Cracking
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Ubuntu 22.04 Made hashcat 1,000x Slower: Inside the yescrypt Switch That Broke Password Cracking

#security #linux #devops #performance
1
Comments
7 min read
Claude Code vs Cursor vs Codex: 31 Days of Real Receipts, and the Cheapest Isn't Who You Think
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Claude Code vs Cursor vs Codex: 31 Days of Real Receipts, and the Cheapest Isn't Who You Think

#ai #productivity #opensource #webdev
1
Comments
8 min read
The Compaction Plugin I Was Releasing Warned Me Mid-Release
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The Compaction Plugin I Was Releasing Warned Me Mid-Release

#claudecode #ai #productivity #opensource
1
Comments 1
6 min read
7 Services, 0 Upload Solutions: Why MCP File Transfer Fails
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7 Services, 0 Upload Solutions: Why MCP File Transfer Fails

#mcp #ai #architecture #webdev
1
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6 min read
Anthropic Rewrote frontend-design Skill: 3 AI Design Clichés Named (With Hex Codes)
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Anthropic Rewrote frontend-design Skill: 3 AI Design Clichés Named (With Hex Codes)

#anthropic #ai #design #claude
1
Comments 1
8 min read
MCP Servers Ship Without OAuth. I Added It and 3 of 5 Clients Broke.
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MCP Servers Ship Without OAuth. I Added It and 3 of 5 Clients Broke.

#mcp #security #oauth #ai
2
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9 min read
RTX 4070 + Qwen 35B: 2.8x Speedup From One llama.cpp Flag (--cpu-moe)
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RTX 4070 + Qwen 35B: 2.8x Speedup From One llama.cpp Flag (--cpu-moe)

#llm #performance #ai #hardware
1
Comments
6 min read
Barge-In Is the Voice-Agent Feature Nobody Benchmarks. I Added It and Lost 120ms.
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Barge-In Is the Voice-Agent Feature Nobody Benchmarks. I Added It and Lost 120ms.

#voiceai #ai #ux #webrtc
1
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8 min read
When the Free Executor Cost More: 40 Trials on Opus + Local Qwen Ended Up the Most Expensive Cloud Arm
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When the Free Executor Cost More: 40 Trials on Opus + Local Qwen Ended Up the Most Expensive Cloud Arm

#ai #llm #agents #programming
2
Comments 1
8 min read
I Let Claude Code Run a Month of My Business Books. It Reconciled 200 Transactions and Miscategorized 11.
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I Let Claude Code Run a Month of My Business Books. It Reconciled 200 Transactions and Miscategorized 11.

#claudecode #ai #automation #productivity
1
Comments
6 min read
AI Citations Have a Half-Life. I Tracked Mine for 9 Weeks and Watched Them Decay.
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AI Citations Have a Half-Life. I Tracked Mine for 9 Weeks and Watched Them Decay.

#llmo #geo #aisearch #measurement
1
Comments
7 min read
I Gave My Agent Persistent Memory. It Remembered the Wrong 3 Things for a Week.
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I Gave My Agent Persistent Memory. It Remembered the Wrong 3 Things for a Week.

#ai #agents #memory #contextengineering
1
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6 min read
I Stopped Adding Context to My Agent and Pruned Tool Outputs Instead — My 3-Hour Task Stopped Forgetting Its Own Plan
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I Stopped Adding Context to My Agent and Pruned Tool Outputs Instead — My 3-Hour Task Stopped Forgetting Its Own Plan

#contextengineering #claudecode #llm #agents
1
Comments
5 min read
AI Search Splits Your One Question Into Six. My Pages Answered None of Them.
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AI Search Splits Your One Question Into Six. My Pages Answered None of Them.

#llmo #geo #aisearch #contentdesign
1
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5 min read
Your Page Rank Is Invisible to AI — Only Your Passages Get Cited
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Your Page Rank Is Invisible to AI — Only Your Passages Get Cited

#llmo #geo #aeo #seo
1
Comments
6 min read
Link-less Brand Mentions Beat Backlinks for AI Visibility — I Read the Ahrefs 75,000-Brand Study So You Don't Have To
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Link-less Brand Mentions Beat Backlinks for AI Visibility — I Read the Ahrefs 75,000-Brand Study So You Don't Have To

#llmo #geo #aeo #seo
1
Comments
6 min read
I Mapped My Codebase as a Graph. The File That Broke Was Two Hops Away.
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I Mapped My Codebase as a Graph. The File That Broke Was Two Hops Away.

#treesitter #staticanalysis #refactoring #devtools
1
Comments
6 min read
I Pointed Copilot, CodeRabbit, and Claude Sub-Agents at the Same 30 PRs. They Agreed on 22%.
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I Pointed Copilot, CodeRabbit, and Claude Sub-Agents at the Same 30 PRs. They Agreed on 22%.

#codereview #ai #claudecode #github
1
Comments 2
6 min read
Your Voice Agent Is Slow. Here Are 5 Tricks to Hide It.
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Your Voice Agent Is Slow. Here Are 5 Tricks to Hide It.

#ai #voiceai #ux #psychology
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7 min read
I Gave the Same Failing Test to Claude, GPT-5, and Gemini. Only One Read the Stack Trace.
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I Gave the Same Failing Test to Claude, GPT-5, and Gemini. Only One Read the Stack Trace.

#ai #llm #claudecode #debugging
1
Comments 2
7 min read
I Added 6 Few-Shot Examples to One Prompt. Two of Them Made the Output Worse.
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I Added 6 Few-Shot Examples to One Prompt. Two of Them Made the Output Worse.

#ai #llm #contextengineering #prompts
1
Comments
6 min read
I Hid Instructions Inside an MCP Tool Description. Claude Ran Them Without Asking.
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I Hid Instructions Inside an MCP Tool Description. Claude Ran Them Without Asking.

#mcp #security #ai #claudecode
1
Comments
7 min read
I Asked 5 AI Search Engines to Cite My Own Blog. Only 3 of 31 Articles Showed Up.
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I Asked 5 AI Search Engines to Cite My Own Blog. Only 3 of 31 Articles Showed Up.

#llmo #geo #ai #seo
1
Comments
7 min read
I Rebuilt My AI Agent From a 600-Line Script Into a Harness. Token Cost Dropped 40%.
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I Rebuilt My AI Agent From a 600-Line Script Into a Harness. Token Cost Dropped 40%.

#ai #agents #harness #claudecode
1
Comments
7 min read
I Ran 3 Claude Code Sessions in Parallel for 8 Hours. They Overwrote Each Other's Context Twice.
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I Ran 3 Claude Code Sessions in Parallel for 8 Hours. They Overwrote Each Other's Context Twice.

#claudecode #ai #productivity #agents
1
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7 min read
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