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feat(agent_config): add AGCFG-009 for hidden text in AGENTS.md - #193
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An AGENTS.md containing zero-width characters, Unicode Tags-block characters or bidirectional overrides, which can hide an instruction from a reviewer while the model still reads it. Medium severity, objective character test, with the byte order mark, emoji joiner and flag-emoji cases exempt. Mirrors the engine fixture byte for byte and bumps the pack schema to 25. Merge only after the analyzer change that adds the repo_agents_md_has_hidden_text predicate: an older engine skips the rule.
trustabl
approved these changes
Oct 20, 2026
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An AGENTS.md containing zero-width characters, Unicode Tags-block characters or bidirectional overrides, which can hide an instruction from a reviewer while the model still reads it. Medium severity, objective character test, with the byte order mark, emoji joiner and flag-emoji cases exempt. Mirrors the engine fixture byte for byte and bumps the pack schema to 25. Merge only after the analyzer change that adds the repo_agents_md_has_hidden_text predicate: an older engine skips the rule.