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Claude Code

Claude Code is Anthropic's agentic coding tool: it reads a codebase, edits files, runs commands and works with git, using Claude models. It started as a terminal tool in February 2025 and now runs in IDEs, a desktop app and the browser, making it one of the main reference products for coding agents.

27 stories · updated Oct 9

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Key facts

Checked Oct 8

Research preview: February 24, 2025 (with Claude 3.7 Sonnet)
General availability: May 22, 2025 (with Claude 4)
Surfaces: Terminal CLI, VS Code, JetBrains, desktop app, web, mobile (via web/cloud sessions)
Project instructions: CLAUDE.md; can read AGENTS.md instead
Access: Most surfaces require a Claude subscription or Anthropic Console account; CLI, VS Code and JetBrains also support third-party providers
Extensibility: MCP, skills, hooks, subagents, Agent SDK

Latest on Claude Code

Agents · ExplainerClaude Code mods, explained: what Anthropic's new extension layer can do, where it runs, and the security trade-offSince October 1, 2026, Claude Code can load JavaScript and TypeScript 'mods' that redraw its interface, rewrite prompts and approve tool calls. What Anthropic's docs say they can do, and what they can reach.Oct 9·8 min read

Developers · GuideBuild your first agent with the Claude Agent SDK (TypeScript, October 2026)Install @anthropic-ai/claude-agent-sdk, call query(), lock down tools and permission modes, add a custom MCP tool and a safety hook, and cap spend. Code type-checked against v0.3.293.Oct 9·7 min read

Developers · GuideHow to write a CLAUDE.md or AGENTS.md file that coding agents actually followWhere each agent looks for its instructions, how long the file should be, what to put in it, and how to check the agent is reading it, from Claude Code, Codex, Cursor and Copilot docs.Oct 9·10 min read

Industry · ExplainerAnthropic explained: history, products and how it makes moneyFounded in 2021 by former OpenAI staff, Anthropic was valued at $965 billion in May 2026. Here's how it's governed, funded and paid, and what's unresolved.Oct 9·9 min read

Developers · ExplainerMCP resources vs tools vs prompts: who decides, and when to use eachMCP servers expose three primitives with three different owners: the model, the app and the user. Here's how each works on the wire in the 2026-07-28 spec, plus what happened to sampling, roots and elicitation.Oct 9·6 min read

Developers · GuideBuild a local MCP server with the official TypeScript SDK (v2): one tool, one resource, one promptA step-by-step guide to a stdio MCP server using @modelcontextprotocol/server 2.3.1, with code we compiled and ran to check it works, plus the MCP Inspector, Claude Desktop and Claude Code.Oct 9·5 min read

Agents · ExplainerWhat "agentic" really means in 2026Every AI product now calls itself agentic. Here's the definition the labs themselves use, how the tool loop works, and how to tell a real agent from a relabeled chatbot.Oct 9·6 min read

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