MDL

Decompose dense codebase-wide, multi-document, PDF, and aggregation work even when the input fits the context window, following Recursive Language Models (Zhang, Kraska, Khattab, 2025). Use when the user asks to analyse all files, a whole repo, all docs, large PDFs, or to aggregate or multi-hop across scattered sources. Skip one file, one function, a single needle, or a one-page PDF conversion. Triggers: long context, context rot, large codebase, many files, all files, big document, multi-document, PDF, aggregate, summarize everything, codebase-wide, multi-hop, recursive, sub-agents, map-reduce.

Use Nerd Fonts (nerdfonts) glyphs for icons in CLI output, TUIs, shell prompts, statuslines, editor and terminal configs, docs, and web pages. Pick a named glyph from the 10,995 on nerdfonts.com/cheat-sheet (nf-md-, nf-fa-, nf-dev-, nf-oct-, nf-cod-, nf-seti-, nf-pl-), verify the codepoint, and install a patched font from nerdfonts.com/font-downloads. Use when adding or fixing terminal or editor icons, tofu or empty boxes instead of icons, starship, powerlevel10k, oh-my-posh, tmux, lualine, nvim-tree, or a Nerd Font install, even if the user does not say nerd fonts. Do not use for Lucide, Heroicons, Tabler, Iconify SVGs, or Google Fonts pairings. Also: Nerd Font Mono vs Propo, brew, scoop, choco, font-patcher. Triggers: icon, glyph, nerd font, nerdfonts, powerline, starship, powerlevel10k, oh-my-posh, tmux status, lualine, nvim-tree, devicons, tofu, boxes instead of icons, terminal font, editor font, codepoint, font-patcher, emoji, icon font, file icons, statusline icons.

Write and review production Rust using the official API Guidelines, Style Guide, and this engineering standard: allocation contracts, ownership, Result vs panic, debug_assert, Clippy, tests, rustdoc, unsafe, and Cargo CI. Use when writing, reviewing, or refactoring Rust; choosing borrow vs clone; designing crate APIs; handling errors; bounding heap use; configuring clippy or rustfmt; or when the user runs /rust-best-practices. Do not use for other languages. Triggers: rust, rustc, cargo, clippy, rustfmt, ownership, clone, borrow, Result, unwrap, expect, panic, thiserror, anyhow, heapless, no_std, allocation, debug_assert, type-state, Send, Sync, unsafe, FFI, rustdoc, MSRV, rust-best-practices, rust style, rust guidelines