What is fzf-mcp AGENTS.md?

Repository instructions for fzf-mcp, a local server that lets an agent search files and file contents using fzf, a fuzzy finder, and findstr or grep.

Use them when changing, testing, or configuring fzf-mcp, especially when updating its search tools or checking that the source and bundle behave the same way.

They document the repository's unusual setup, including two code copies that must stay in sync and a built file that is launched instead of the source file.

How danielsimonjr/fzf-mcp configures Claude Code and Codex

Reuse

Borrowing it

Nothing to install: this file belongs to danielsimonjr/fzf-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/danielsimonjr/fzf-mcp/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/danielsimonjr/fzf-mcp

Made for: Claude Code, Codex, OpenCode.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/danielsimonjr/fzf-mcp/agents-md/github.svg)](https://agentmods.dev/instructions/danielsimonjr/fzf-mcp/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/danielsimonjr/fzf-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/danielsimonjr/fzf-mcp/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/danielsimonjr/fzf-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/danielsimonjr/fzf-mcp/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 959 This file is loaded in full into every session.

When invoked 959 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00959	$0.00959
Opus 5	$0.00479	$0.00479
Sonnet 5	$0.00192	$0.00192
Haiku 4.5	$0.00096	$0.00096

Measured 9d ago against content hash 8fd190b26f86, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

fzf-mcp 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 9d 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.

AGENTS.md · 72 lines

How it starts

The opening of the file, as written. The whole thing — 72 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md — fzf-mcp

How to operate on this repo without breaking it. Read this and MEMORY.md before making changes. Pairs with TODO.md (open work).

What this is

MCP server (@danielsimonjr/fzf-mcp, CommonJS, Windows-primary) that wraps the fzf fuzzy finder plus findstr/grep for content search. Tools: fuzzy_search_files, fuzzy_search_content, fuzzy_filter. install-fzf.js (postinstall) downloads the fzf binary into bin/.

The things that bite

Two copies of the code — edit both.
- index.js — source (package.json main/bin).
- bundle/index.cjs — the built bundle that .mcp.json launches (${CLAUDE_PLUGIN_ROOT}/bundle/index.cjs).
- No build script (package.json scripts has only postinstall/test), so the bundle is not regenerated — hand-port any index.js change into bundle/index.cjs and keep them in sync. The bundle uses __require, so require("fs")/require("path") work inside it. tests/test_fzf_path_resolution.js runs against both modules to catch parity drift.
The running server is NOT this repo (maintainer's machine). Claude Code loads a separate copy at %USERPROFILE%\servers\src\fzf-mcp\index.js via .claude.json. Repo commits do not change the running server until redeployed to servers\src. See TODO.md.
CRLF churn — normalize to LF before staging. (.gitattributes now enforces LF, but existing working-tree flips may linger.) Before staging an edited file:
```
tr -d '\r' < index.js > index.js.tmp && mv -f index.js.tmp index.js
git diff HEAD --stat -- index.js   # should be tiny
```
Confirm a suspected EOL flip with git diff HEAD --ignore-all-space -- <file> (empty = pure EOL). Stage narrowly — never git add -A.
Never spawn a bare executable name. On Windows spawn("fzf") / spawn("findstr") lets CreateProcess search the CWD first (binary planting).
- fzf: resolveFzfPath() requires an absolute FZF_PATH or probes known absolute locations, and throws instead of a bare name. Resolved lazily (at spawn time).
- archive extract (install-fzf.js): uses absolute %SystemRoot%\System32\tar.exe.
- Still bare (tracked in TODO): findstr/grep in runSearchCommand.

Read the full file on GitHub · 72 lines

Changes

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.

9d ago First seen · 72 lines · 959 tokens per session scan A 8fd190b26f86

Subscribe to this mod's changes

fzf-mcp AGENTS.md is an instructions file published in the GitHub repository danielsimonjr/fzf-mcp (3 stars, last pushed yesterday), licensed MIT. It adds 959 tokens to every session, about $0.0048 per session on Opus 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 2026-08-31.

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