Francis Du.

💻Data Engineer | 🦀 Rustacean | 📷 Photographer | 🤖Vibe Coder

Writing

Recent writing

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22 Sep 2026
wcode 13 min read

wcode: Rebuilding the Coding Agent Runtime Around Jev

I do not want wcode to become another Claude Code. After reading Why yet another agent, I am even more convinced that Jev / TypeSafe ideas belong in the runtime beneath coding agents: context, state, action routing, verification, and background intelligence.
19 Sep 2026
wcode 10 min read

wcode 0.8: I Started Treating the Repository as an Engineering Digital Twin

In 0.8 I stopped adding isolated agent tools and started pulling architecture, code relationships, the Decision Plane, Engineering Fitness, and verification into one evidence-aware engineering view. The current release is 0.8.1.
19 Sep 2026
wcode 24 min read

Using Jev in wcode and Scopwis

I wired Jev into wcode and Scopwis and ran several rounds of live API tests. This is what changed when I narrowed the questions, where the numbers held up, and where I finally gave Jev authority in each system.
12 Sep 2026
wcode 9 min read

How wcode Grew Past the MCP Bridge I Started With

wcode started because I wanted browser-based models to work on local code. The project changed once I started using it for real edits and had to deal with repository context, safe changes, and proof.
12 Sep 2026
wcode 7 min read

wcode 0.6.2: What 32 Tool Slots Were Hiding

I split tool slots, CPU, file I/O, and child processes into separate budgets, then fixed a few places where wcode looked healthier or busier than it really was.
12 Sep 2026
wcode 5 min read

Why “Tests Passed” Wasn't Enough for wcode

I wanted more than a green line at the end of an agent run, so wcode keeps verification tied to the exact repository revision and records what is still unknown.