dmtrKovalenko/fff is a file-search toolkit that helps people and AI agents find paths and content, including through typo-tolerant search and an in-memory index. Editors and agent tools use it when they need repeated file searches and background updates.
Borrowing it
Nothing to install: this file belongs to dmtrKovalenko/fff. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/dmtrKovalenko/fff/main/AGENTS.mdgit clone --depth 1 https://github.com/dmtrKovalenko/fffWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/instructions/dmtrkovalenko/fff/agents-md)<a href="https://agentmods.dev/instructions/dmtrkovalenko/fff/agents-md"><img src="https://agentmods.dev/badge/instructions/dmtrkovalenko/fff/agents-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/dmtrkovalenko/fff/agents-md"><img src="https://agentmods.dev/badge/instructions/dmtrkovalenko/fff/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.01321 | $0.01321 |
| Opus 5.5 | $0.00528 | $0.00528 |
| Sonnet 5.5 | $0.00264 | $0.00264 |
| Haiku 4.5 | $0.00132 | $0.00132 |
Grade A, and why
fff AGENTS.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 119 lines — stays where its author put it; the contents beside it link to each section on GitHub.
To Clankers
This repository contains FFF.nvim (Fast File Finder), a high-performance file picker for Neovim inspired by blink.cmp's fuzzy matching technology. It's NOT a completion plugin, but rather a standalone file finder with advanced fuzzy search and frecency scoring. The project aims to be the drop-in replacement for telescope, fzf-lua, snacks.picker and similar plugins, focusing on speed, accuracy search and usability features.
Development Commands
Always prefer Makefile commands listed to the cargo/bun/node if possible.
Building
make build- build everything
Testing and Development Tools
This project does not have a traditional test suite. Testing is done through:
- Create e2e local test file for Neovim: Load any Lua test file with
nvim -l <test_file> - Write inline rust unit tests for any functionality that is standalone and scoped within a single function
Code Quality
make lint- Rust linting and code analysismake format- Format all codemake test- Run unit tests (limited coverage, primarily integration testing)
When doing code make sure to REDUCE SIZE OF COMMENTS. This is very important. Every comment should be concise 1-2 liner maximum 4 lines if describes really extensive and unnatural concept.
Important coding rules
- Do not add doc comments to the private structs and functions.
- Do not make public structs if something can be private
Style guide
- NO MODULES COMMENTS
- NO TOP FILE COMMENTS
- NO COMMENT LONGER THAN 2 LINES UNLESS ASKED EXPLICITLY
- UTILITY FUNCTIONS GO INTO THE END OF FILE
Architecture
Everything that is performance critical happens in rust world, everything that is neovim specific happens in the lua code.
There are 3 main components:
- Rust binary with the global file picker state containing index of all files
- Background thread with the file system watcher that updates the index in real time
- Lua UI layer that renders the picker, handles user input, and calls the rust functions via FFI
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2mo ago First seen · 119 lines · 1,321 tokens per session scan A bf506bb095f4
fff AGENTS.md is an instructions file published in the GitHub repository dmtrKovalenko/fff (11,184 stars, last pushed today), licensed MIT. It adds 1,321 tokens to every session, about $0.0053 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.