# claude.dev

> Technical writing from Anthropic for people building with claude:
> deep dives, mental models, and guides.

## posts

- [How the Claude Code team does code review](https://claude.dev/blog/solving-code-review-at-anthropic/): 2026-10-15 · engineering · 14 min · [markdown](https://claude.dev/blog/solving-code-review-at-anthropic.md) — How do you review code at the volume agents produce it? On the Claude Code team, once we had high coverage and deep reviews, we started optimizing for the minimum amount of human review time that doesn't raise reverts or incidents.
- [Building effective agent automations](https://claude.dev/blog/building-effective-agent-automations/): 2026-10-08 · agents · 9 min · [markdown](https://claude.dev/blog/building-effective-agent-automations.md) — A reference implementation walkthrough with common failure modes
- [Claude Code in the cloud: a field guide to cloud sessions](https://claude.dev/blog/claude-code-in-the-cloud/): 2026-10-06 · playbooks · 18 min · [markdown](https://claude.dev/blog/claude-code-in-the-cloud.md) — What changes when Claude Code runs on its own machine, the workflows where that pays off, and how to connect GitHub on the first try.
- [Getting started with Claude Code mods](https://claude.dev/blog/getting-started-with-claude-code-mods/): 2026-10-01 · tutorials · 11 min · [markdown](https://claude.dev/blog/getting-started-with-claude-code-mods.md) — Build your first Claude Code mod from an empty folder, then see what else the API can do.
- [Building with Claude Sonnet 5.5](https://claude.dev/blog/building-with-claude-sonnet-5-5/): 2026-09-28 · playbooks · 9 min · [markdown](https://claude.dev/blog/building-with-claude-sonnet-5-5.md) — When to choose Sonnet over Opus, what it costs, and how to tune it.
- [Automating eval design and hillclimbing with Claude](https://claude.dev/blog/automating-eval-design-and-hillclimbing/): 2026-09-28 · playbooks · 12 min · [markdown](https://claude.dev/blog/automating-eval-design-and-hillclimbing.md) — Principles for designing evals and hillclimbing against them without fooling yourself, and how the claude-api skill's build-eval and hillclimb commands put them to work.
- [What a task costs on Opus 5.5](https://claude.dev/blog/what-a-task-costs-on-opus-5-5/): 2026-09-25 · playbooks · 21 min · [markdown](https://claude.dev/blog/what-a-task-costs-on-opus-5-5.md) — Opus 5.5 costs less per token than Opus 5.
- [Using Claude Code: Spending your effort](https://claude.dev/blog/spending-your-effort/): 2026-09-25 · engineering · 8 min · [markdown](https://claude.dev/blog/spending-your-effort.md) — What effort really is and when to use which level in Claude Code, from my own tests of three builds and a deep dive into Terminal-Bench 3.0 on Opus 5.5 and Fable 5.1.
- [How we made claude.ai 3x faster in two weeks](https://claude.dev/blog/how-we-made-claude-ai-faster/): 2026-09-23 · engineering · 15 min · [markdown](https://claude.dev/blog/how-we-made-claude-ai-faster.md) — Once Claude can measure something, it can make it faster. So we kept finding more things to measure.
- [Getting the most out of Opus 5.5 in Claude and Claude Code](https://claude.dev/blog/getting-the-most-out-of-opus-5-5/): 2026-09-22 · playbooks · 9 min · [markdown](https://claude.dev/blog/getting-the-most-out-of-opus-5-5.md) — How to prompt Opus 5.5, steer a long run, and check your results in Claude apps and Claude Code.
- [The new rules of context engineering for Claude 5 generation models](https://claude.dev/blog/the-new-rules-of-context-engineering-for-claude-5-generation-models/): 2026-07-24 · engineering · 7 min · [markdown](https://claude.dev/blog/the-new-rules-of-context-engineering-for-claude-5-generation-models.md) — We removed over 80% of Claude Code's system prompt for more advanced models. How to apply the lessons we learned to your own context engineering in Claude Code and with your own agents.
- [Lessons from building Claude Code: How we use skills](https://claude.dev/blog/lessons-from-building-claude-code-how-we-use-skills/): 2026-06-03 · skills · 11 min · [markdown](https://claude.dev/blog/lessons-from-building-claude-code-how-we-use-skills.md) — What we learned building and scaling hundreds of skills internally at Anthropic.
- [A harness for every task: dynamic workflows in Claude Code](https://claude.dev/blog/a-harness-for-every-task-dynamic-workflows-in-claude-code/): 2026-06-02 · agents · 11 min · [markdown](https://claude.dev/blog/a-harness-for-every-task-dynamic-workflows-in-claude-code.md) — Claude Code can now write and orchestrate its own multi-agent harness on the fly. Here's how dynamic workflows work, and the patterns that get the most out of them.
- [Using Claude Code: The unreasonable effectiveness of HTML](https://claude.dev/blog/using-claude-code-the-unreasonable-effectiveness-of-html/): 2026-05-20 · playbooks · 9 min · [markdown](https://claude.dev/blog/using-claude-code-the-unreasonable-effectiveness-of-html.md) — How and why members of the Claude Code team use HTML instead of Markdown to produce richer, more readable, and easily shareable outputs.
- [Lessons from building Claude Code: Prompt caching is everything](https://claude.dev/blog/lessons-from-building-claude-code-prompt-caching-is-everything/): 2026-04-30 · engineering · 6 min · [markdown](https://claude.dev/blog/lessons-from-building-claude-code-prompt-caching-is-everything.md) — Best practices for optimizing prompt caching in Claude Code, including how to most effectively structure your prompt, use tools, and layer on compaction.
- [Seeing like an agent: how we design tools in Claude Code](https://claude.dev/blog/seeing-like-an-agent/): 2026-04-10 · agents · 7 min · [markdown](https://claude.dev/blog/seeing-like-an-agent.md) — Learn how the Claude Code team designs, tests, and evolves tools by thinking from the model's point of view.

## other

- [posts.json](https://claude.dev/posts.json): the post index as data
- [rss.xml](https://claude.dev/rss.xml): the published posts as an RSS 2.0 feed