Claude Sonnet

Headlines · 3

1. 15h
   Developer builds browser city builder Civitas with Claude Code

   A developer posted on r/ClaudeAI about Civitas, an experimental multiplayer 3D city builder that runs in the browser on three.js and TypeScript, where Claude Code wrote the code, tests and tooling while the developer picked features, set priorities and made trade-offs. The free public demo is a read-only London laid out from real coordinates, with the Thames and its bridges, about 30 real landmarks, and roughly 30,000 individually simulated citizens with homes, jobs and commutes. The author says one Claude Code session acted as coordinator, breaking features into kanban tasks via an MCP server and handing them to subagents — Opus for simulation and networking, Sonnet for rendering and UI — each working in its own git worktree and running typechecks, a demo hash-comparison check and load tests before merging.

   r/ClaudeAI · 🔥 3
2. 21h
   Claude Code internals explained: CLAUDE.md, Hooks, Skills and Subagents

   A Juejin author writing as "Silent Wang Er" walks through Claude Code's internals based on its official documentation, starting with the seven kinds of content in the context window and the two-step overflow strategy: clearing older tool outputs first, then summarizing the conversation history, which the author notes can lose earlier instructions. The piece details how four CLAUDE.md layers (managed policy, user, project, local) are concatenated rather than overridden, with an official recommendation to keep each file under 200 lines, and how Hooks enforce rules via exit codes and PreToolUse permission decisions such as allow, deny and ask. It also covers Skills' on-demand loading, a 1536-character cap on each Skill description, a 1% context budget for the skill index list, and the context isolation of the built-in Explore, Plan and General-purpose Subagents, where Explore and Plan skip loading CLAUDE.md and Git status at startup.

   掘金 · 人工智能 · 🔥 3
3. Oct 8
   Block uses Claude Fable 5 to orchestrate migrations across thousands of PRs

   Anthropic published an interview with Bradley Axen, Block's head of AI capabilities, describing how Block uses Claude Fable 5 to run company-wide code migrations — work that can span hundreds or thousands of pull requests across multiple repositories and millions of lines of code. A human engineer steers while Fable handles higher-level design such as data models, API specs and algorithms, then directs up to dozens of smaller, more cost-effective models like Opus and Sonnet to make edits and run tests. Axen said early results show the orchestrator spends frontier tokens on complex upfront planning while a higher percentage of tokens goes to smaller worker models; the interview also covers Block's open-source Buzz workspace for human-agent teams, an internal auto-selector for choosing models, and the role of built-in safeguards and Anthropic's safety classifiers.

   Claude Blog · 🔥 0

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