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Marc

Building Kumiko, an MIT-licensed TypeScript framework for multi-tenant SaaS on Bun and Hono. I write up what we measure with AI agents: real costs, failed runs, open questions.

Joined Joined on  Personal website https://kumiko.rocks

Work

Founder, Cosmic Drift. Building Kumiko and the apps on it.

An AST fingerprint and an embedding model both look for duplicate code. Here's where each one is wrong
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Marc

An AST fingerprint and an embedding model both look for duplicate code. Here's where each one is wrong

#typescript #ai #refactoring #testing
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8 min read

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Five models built the same app for $0.06 to $0.45. Most of the red was our fault
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Marc

Five models built the same app for $0.06 to $0.45. Most of the red was our fault

#ai #llm #typescript #testing
Comments
5 min read
Our AI assistant saw every feature as a tool. That cost $0.148 per turn
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Marc

Our AI assistant saw every feature as a tool. That cost $0.148 per turn

#ai #llm #typescript #architecture
6
Comments 24
4 min read
Our framework docs, three models, isolated agents: 99 seconds, 50 minutes, and a timeout
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Marc

Our framework docs, three models, isolated agents: 99 seconds, 50 minutes, and a timeout

#ai #testing #typescript #llm
Comments 2
5 min read
Changing a mail template used to need a deploy. We built an editor that refuses to publish a broken one
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Marc

Changing a mail template used to need a deploy. We built an editor that refuses to publish a broken one

#typescript #opensource #webdev #pdf
Comments
5 min read
Our comment section redesigned our agent permissions. Here's what we still can't solve
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Marc

Our comment section redesigned our agent permissions. Here's what we still can't solve

#discuss #ai #security #typescript
Comments
6 min read
A fresh coding agent passed all four tasks against our framework docs. Here's what that result doesn't prove
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Marc

A fresh coding agent passed all four tasks against our framework docs. Here's what that result doesn't prove

#ai #typescript #testing #documentation
Comments
6 min read
Turning on MFA took one line. Making it true took three routes and a test kit
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Marc

Turning on MFA took one line. Making it true took three routes and a test kit

#security #ai #testing #typescript
1
Comments 2
5 min read
We moved OCR out of the app so egress could be zero
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Marc

We moved OCR out of the app so egress could be zero

#ai #devops #kubernetes #security
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3 min read
Undocumented handlers don't exist to the agent
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Marc

Undocumented handlers don't exist to the agent

#ai #llm #typescript #agents
Comments 11
4 min read
A green boot does not prove your key manager is being used
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Marc

A green boot does not prove your key manager is being used

#security #devops #kubernetes #typescript
Comments
5 min read
Your AI eval is green because it never called the model
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Marc

Your AI eval is green because it never called the model

#ai #llm #typescript #testing
Comments 6
6 min read
The model obeys your schema, not your description
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Marc

The model obeys your schema, not your description

#ai #llm #typescript #json
1
Comments 2
6 min read
You asked how I know what the model did. Here are the answers, with numbers.
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Marc

You asked how I know what the model did. Here are the answers, with numbers.

#ai #llm #monitoring #performance
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6 min read
Multi-Tenant AI Chat: From Hardcoded Config to BYOK in 4 Steps
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Marc

Multi-Tenant AI Chat: From Hardcoded Config to BYOK in 4 Steps

#ai #multitenancy #typescript #prisma
Comments
4 min read
We Cut Our AI Pipeline Costs 25% Without Losing Accuracy (and the fix wasn't a cheaper model)
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Marc

We Cut Our AI Pipeline Costs 25% Without Losing Accuracy (and the fix wasn't a cheaper model)

#ai #typescript #llm #architecture
1
Comments 7
3 min read
We Shipped a Mortgage Calculator Bug Where Every Test Was Green and the Answer Was Still Wrong
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Marc

We Shipped a Mortgage Calculator Bug Where Every Test Was Green and the Answer Was Still Wrong

#bug #debugging #softwareengineering #testing
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3 min read
Your event store is already your audit log
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Marc

Your event store is already your audit log

#eventsourcing #postgres #architecture #backend
1
Comments
3 min read
How do you prevent AI-generated code from drifting away from your conventions over time?
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Marc

How do you prevent AI-generated code from drifting away from your conventions over time?

#ai #webdev
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1 min read
Multi-Tenancy in Bun/Hono Without Boilerplate
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Marc

Multi-Tenancy in Bun/Hono Without Boilerplate

#architecture #database #saas #typescript
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Comments
2 min read
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