@evanchen

Evanchen

@evanchenJoined July 2026

Building Mosoo — an open-source agent runtime for coding agents.

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Evanchen's blogs

Mosoo Engineeringmosoo-engineering.hashnode.dev6 posts

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EEvanchenmosoo-engineering.hashnode.dev1d ago · 4 min read

From model calls to agent tasks

Every generation of AI API gives developers a new primitive. Completions returned text. Chat APIs added structured messages. Tool calling let models request actions. Each step moved more intelligence

EEvanchenmosoo-engineering.hashnode.dev1d ago · 4 min read

The journey begins with an Imagine If.

Follow the notes upon the journey. At first sight marks one's destiny. Return lies within the hasty keys. A few months ago, I was moving between customer sites, talking through our New Agent Design i

EEvanchenmosoo-engineering.hashnode.dev1d ago · 7 min read

From responses to agents: the API becomes a runtime

By the GPT-5.6 era, the direction of OpenAI's API platform is difficult to miss. The model endpoint is no longer shaped only around generating the next piece of text. It can keep state, operate tools,

EEvanchenmosoo-engineering.hashnode.dev1d ago · 6 min read

From API to CLI + Skill: a new software development paradigm

While building mosoo, we originally followed a familiar sequence: build the API first, close the loop on the product's core capabilities, and only then create a CLI to make those capabilities easier f

EEvanchenmosoo-engineering.hashnode.dev1d ago · 7 min read

An agent's state is not its process

Two recent discussions about cloud agents exposed a real architectural disagreement. The first discussion offered two choices: run agent loops centrally and send only tool calls to sandboxes, or give

Evanchen

About

Available for

Evanchen's blogs

Recently published

From model calls to agent tasks

The journey begins with an Imagine If.

From responses to agents: the API becomes a runtime

From API to CLI + Skill: a new software development paradigm

An agent's state is not its process

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Evanchen

About

Available for

Evanchen's blogs

Recently published

From model calls to agent tasks

The journey begins with an Imagine If.

From responses to agents: the API becomes a runtime

From API to CLI + Skill: a new software development paradigm

An agent's state is not its process