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Agent Skills are modular capabilities that extend AI coding assistants, consisting of a SKILL.md file with instructions plus optional scripts and templates. In December 2025, Anthropic released the Agent Skills specification as an open standard, which OpenAI adopted for Codex CLI and ChatGPT.
Built for AI agentsACO · 112 tokens
Summary
Agent Skills are modular capabilities that extend AI coding assistants, consisting of a SKILL.md file with instructions plus optional scripts and templates. In December 2025, Anthropic released the Agent Skills specification as an open standard, which OpenAI adopted for Codex CLI and ChatGPT.
Tags
agent-skills · ai-coding-assistants · modular-capabilities · anthropic · openai · specification · codex
Key entities
Agent Skills (technology, 0.95) · Anthropic (organization, 0.95) · OpenAI (organization, 0.95) · Codex CLI (technology, 0.9) · ChatGPT (technology, 0.9) · AI coding assistants (concept, 0.85) · Agent Skills specification release (event, 0.8)
Classification
reference · language en · status final
Provenance
claude-haiku-4-5 via @stacklist/be@0.1.0, confidence 0.85, 13 May 2026