AICodeKing

Claude Code 3.0 (New Mods Feature): Anthropic has SILENTLY dropped their BIGGEST NEW Feature!

Sep 19, 2026 7 min
claude codeanthropicai agentssoftware development
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Summary

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Anthropic has introduced a 'mods' system and agent instructions to Claude Code, allowing developers to customize agent behavior and manage project workflows.

This video details significant updates to Claude Code, specifically the new 'mods' system and support for AGENTS.md instruction files. By creating custom mod plugins that utilize function hooks, developers can intercept and customize Claude Code's core behavior, such as modifying tool outputs or altering UI components. Furthermore, the introduction of AGENTS.md allows for project-specific instructions that take priority over general configurations, enabling specialized workflows for complex, multi-component projects. The update also covers practical improvements like a new live diff panel and the introduction of Fable 5.1, providing increased context windows for complex development tasks.

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Worth watching if: You are a software developer using Claude Code and looking to optimize your workflow through project-specific instructions and custom plugin development.

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