What is file-search-on CLAUDE.md?

Repository instructions and developer guidance for file-search-on, a Go command-line tool that searches files recursively and matches them using expressions based on file metadata and content.

Building, testing, linting, and understanding the file-search-on Go project, including its file-type analysis and tree-sitter language parsers.

It gives coding agents the project’s commands, testing routine, and architecture so they can make changes consistently and check their work.

How richardwooding/file-search-on configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to richardwooding/file-search-on. 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/richardwooding/file-search-on/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/richardwooding/file-search-on

Made for: Claude Code.

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/richardwooding/file-search-on/claude-md/github.svg)](https://agentmods.dev/instructions/richardwooding/file-search-on/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/richardwooding/file-search-on/claude-md"><img src="https://agentmods.dev/badge/instructions/richardwooding/file-search-on/claude-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/richardwooding/file-search-on/claude-md"><img src="https://agentmods.dev/badge/instructions/richardwooding/file-search-on/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 4,855 This file is loaded in full into every session.

When invoked 4,855 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	$0.04855	$0.04855
Opus 5.5	$0.01942	$0.01942
Sonnet 5.5	$0.00971	$0.00971
Haiku 4.5	$0.00485	$0.00485

Measured 1mo ago against content hash 3279ba81d635, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

file-search-on CLAUDE.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 1mo 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.

CLAUDE.md · 127 lines

How it starts

The opening of the file, as written. The whole thing — 127 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Project

file-search-on is a Go CLI that recursively searches a directory and matches files against a CEL expression evaluated over file metadata and content-type-specific attributes (e.g. is_pdf && page_count > 10, is_markdown && word_count > 500).

Module: github.com/richardwooding/file-search-on. Toolchain: Go 1.26.2.

Commands

go build ./...                                  # build all packages
go build -o file-search-on ./cmd/file-search-on # build the CLI binary
go test ./...                                   # run all tests
go test -race -coverprofile=coverage.out ./...  # what CI runs
go test ./internal/celexpr -run TestEvaluator   # run a single test (regex match)
go vet ./...
go fix -diff ./...                              # preview Go 1.26 modernizers
go fix ./...                                    # apply them
golangci-lint run                               # CI uses `latest` version

Tree-sitter grammars (binary size). Symbol + complexity extraction for every source language except Go (which keeps the stdlib AST) — Rust / TypeScript / JavaScript / Ruby / Swift / Kotlin / C / C++ plus Python / Java / C# / PHP / Perl / R / MATLAB / Scala — lives in the extracted module github.com/richardwooding/treesitter-symbols (tssymbols.Extract, called from sourcetype.go; positional references via tssymbols.ReferenceSites in reference_lines.go; #540). It carries the github.com/odvcencio/gotreesitter runtime + the bundled grammars and computes per-function cyclomatic + cognitive complexity over the same parse via github.com/richardwooding/codemetrics. gotreesitter is a transitive (indirect) dep of this repo now. The grammar-embedding build tags still apply module-wide: a plain go build / go test embeds all ~206 grammars (~~+22 MB) — fine for dev. Release builds (.goreleaser.yaml) pass grammar_subset + one grammar_subset_<lang> tag per supported language so only those embed (~~+13 MB for the 16). To reproduce a release-equivalent local build:

Read the full file on GitHub · 127 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.

1mo ago Changed · +174 tokens per session 3279ba81d635
2mo ago First seen · 127 lines · 4,681 tokens per session scan A a98b39b01d5a

Subscribe to this mod's changes

file-search-on CLAUDE.md is an instructions file published in the GitHub repository richardwooding/file-search-on (5 stars, last pushed 4d ago), licensed MIT. It adds 4,855 tokens to every session, about $0.0194 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 2026-08-31.

cel cli content-detection file-search go mcp

file-search-on CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
file-search-on CLAUDE.mdrichardwooding/file-search-on	Instructions file	5	4d ago	MIT	A	4,855	Claude Code
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vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

file-search-on: Instructions file for Claude Code