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Quoting Thariq Shihipar

Blog · Watch/Read · (gathered 2026-09-23)

  • Anthropic’s Claude Code is introducing a new mechanism for defining AI agent instructions, moving towards greater customization and flexibility.
  • Starting with version 2.1.277, Claude Code will support AGENTS.md files as an alternative to CLAUDE.md for project instructions, checking for AGENTS.md if CLAUDE.md is not present.
  • This AGENTS.md support is a “built-in mod” within the “Claude Code mods” framework, which will eventually allow users to build and deploy their own custom versions of project instructions to customize the Claude Code harness.
  • Developers using Claude Code can expect enhanced control over agent behavior and instructions, with the future ability to create bespoke instruction sets.