Markdown Bold Text in AI Agent Instruction Files Does Not Affect Model Behavior

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Developers commonly bold rules in AI agent instruction files like CLAUDE.md or AGENTS.md expecting the model to prioritize them, but no documented mechanism translates text emphasis into increased model attention. Language models process asterisks as plain characters in a sequence, with no pathway from visual formatting to weighted instruction following. Research from Georgia Tech, UC Berkeley, and Microsoft (PASTA) shows attention reweighting is possible at inference, but this is not how current agent file parsing works. Anthropic's own Claude Code guidance recommends using the word 'IMPORTANT' on a single line instead of bold markup, warning that over-emphasizing many lines makes none stand out. Across Claude, Codex, and Gemini ecosystems, none document Markdown emphasis as a functional steering mechanism in instruction files.

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