What a harness is and how to build one with Claude Agent SDK

2026-07-08 · 25 min · 31 entities

episode page audio

Asserted relationships

→ references Vadimdemedes product

0.77

evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://github.com/vadimdemedes/ink
→ appeared on How I AI podcast

0.68

evidence rules-v5
What a harness is and how to build one with Claude Agent SDK
→ hosted by Claire Vo person

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evidence rules-v5
Feed author/publisher: Claire Vo
→ discusses Technology company

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evidence rules-v5
Feed category: Technology
→ references penname.co website

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evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://penname.co/
→ references linear.app website

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evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://linear.app/
→ references github.com website

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evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://github.com/
→ references chatprd.ai website

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evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://chatprd.ai/
→ references clairevo.com website

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evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://clairevo.com/
→ references vercel.com website

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evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://vercel.com/
→ references Claude company

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evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://anthropic.com/claude/opus
→ references sentry.io website

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evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://sentry.io/
→ references Introducing Gpt 5 5 website

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evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://openai.com/index/introducing-gpt-5-5
→ references Claude Sonnet 4 6 website

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evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://anthropic.com/news/claude-sonnet-4-6
→ references Agent Sdk person

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evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://code.claude.com/docs/en/agent-sdk/overview

Entities found in this episode

websites 18

mentioned penname.co website

0.45

evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://penname.co/
mentioned linear.app website

0.45

evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://linear.app/
mentioned github.com website

0.45

evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://github.com/
mentioned chatprd.ai website

0.45

evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://chatprd.ai/
mentioned clairevo.com website

0.45

evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://clairevo.com/
mentioned vercel.com website

0.45

evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://vercel.com/
mentioned sentry.io website

0.45

evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://sentry.io/
mentioned Introducing Gpt 5 5 website

0.45

evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://openai.com/index/introducing-gpt-5-5
mentioned Claude Sonnet 4 6 website

0.45

evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://anthropic.com/news/claude-sonnet-4-6
references penname.co website

0.38

evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://penname.co/
references linear.app website

0.38

evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://linear.app/
references github.com website

0.38

evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://github.com/
references chatprd.ai website

0.38

evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://chatprd.ai/
references clairevo.com website

0.38

evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://clairevo.com/
references vercel.com website

0.38

evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://vercel.com/
references sentry.io website

0.38

evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://sentry.io/
references Introducing Gpt 5 5 website

0.38

evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://openai.com/index/introducing-gpt-5-5
references Claude Sonnet 4 6 website

0.38

evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://anthropic.com/news/claude-sonnet-4-6

persons 5

mentioned Claude Agent SDK person

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evidence rules-v5
What a harness is and how to build one with Claude Agent SDK
mentioned Claire Vo person

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evidence rules-v5
Feed author/publisher: Claire Vo
hosted by Claire Vo person

0.55

evidence rules-v5
Feed author/publisher: Claire Vo
mentioned Agent Sdk person

0.45

evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://code.claude.com/docs/en/agent-sdk/overview
references Agent Sdk person

0.38

evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://code.claude.com/docs/en/agent-sdk/overview

companys 4

mentioned Technology company

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evidence rules-v5
Feed category: Technology
mentioned Claude company

0.45

evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://anthropic.com/claude/opus
discusses Technology company

0.40

evidence rules-v5
Feed category: Technology
references Claude company

0.38

evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://anthropic.com/claude/opus

products 2

mentioned Vadimdemedes product

0.90

evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://github.com/vadimdemedes/ink
references Vadimdemedes product

0.77

evidence rules-v5
Link in episode "What a harness is and how to build one with Claude Agent SDK": https://github.com/vadimdemedes/ink

podcasts 1

appeared on How I AI podcast

0.68

evidence rules-v5
What a harness is and how to build one with Claude Agent SDK

concepts 1

mentioned SDK concept

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evidence rules-v5
SDK

Episode description as stored

Everybody is saying, “It’s not the model, it’s the harness,” but almost nobody stops to explain what a harness actually is. So I did. I built one live on the show: a Sentry bug-debugging harness for my company ChatPRD, using the Claude Agent SDK, a custom terminal UI built with the Ink library, and opinionated adapters for Sentry, Linear, GitHub, and Vercel. The harness handles evidence gathering, root-cause analysis, and follow-up artifact creation, all without me needing to type “dear agent, please fix this bug” ever again. I also walk through the architecture, share the code structure, and give you the exact process I used so you can build your own harness for any repetitive, structured workflow in your business. What you’ll learn: What a harness actually is When to build a harness versus when to stick with a general-purpose tool like Claude Code or Codex How to encode specific permissions into a harness The three components every harness needs How I used GPT-5.5 and Claude Opus to build the harness code itself (and where they both initially resisted) How to structure the artifacts your harness produces so the whole team can use the output — Brought to you by: Bolt.new —Turn your idea into a real product Customer.io —Build customer engagement campaigns from a single prompt — In this episode, we cover: (00:00) What is an AI harness? (03:19) When to build a harness (04:33) Why Claire picked bug triage (06:00) Why not just use Claude Code? (07:48) Demo: The custom harness interface (11:04) Architecture: runs, tasks, tools, and artifacts (13:44) Building it with Codex and Claude (15:08) Code map and file layout (16:51) A look at the code (19:18) The live investigation result (21:01) How to build your own harness — Tools referenced: • Claude Agent SDK (Anthropic): https://code.claude.com/docs/en/agent-sdk/overview • Claude Sonnet 4.6 (model used inside the harness): https://www.anthropic.com/news/claude-sonnet-4-6 • Claude Opus (used to build the harness): https://www.anthropic.com/claude/opus • GPT-5.5 (Codex, used to build the harness): https://openai.com/index/introducing-gpt-5-5/ • Ink (terminal UI library for Node.js): https://github.com/vadimdemedes/ink • Sentry (error monitoring): https://sentry.io/ • Linear (project management): https://linear.app/ • GitHub: https://github.com/ • Vercel: https://vercel.com/ — Where to find Claire Vo: ChatPRD: https://www.chatprd.ai/ Website: https://clairevo.com/ LinkedIn: https://www.linkedin.com/in/clairevo/ X: https://x.com/clairevo — Production and marketing by https://penname.co/ . For inquiries about sponsoring the podcast, email jordan@penname.co.