What is Fetchium CLAUDE.md?

Repository instructions for Fetchium, a Rust workspace containing several related software packages. They document how to compile, test, lint, format, and run its command-line program.

Use them when developing Fetchium, checking its packages, building debug or release binaries, running tests, enforcing zero-warning linting, or generating documentation.

They give an agent the exact project commands and warn about a macOS development-setting issue that can break native dependencies.

How zuhabul/Fetchium configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to zuhabul/Fetchium. 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/zuhabul/Fetchium/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/zuhabul/Fetchium

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/zuhabul/fetchium/claude-md/github.svg)](https://agentmods.dev/instructions/zuhabul/fetchium/claude-md)

Your own site

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

Per session 2,643 This file is loaded in full into every session.

When invoked 2,643 The same file — it is already loaded in full.

Security scan C 2 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	$0.02643	$0.02643
Opus 5.5	$0.01057	$0.01057
Sonnet 5.5	$0.00529	$0.00529
Haiku 4.5	$0.00264	$0.00264

Measured 2mo ago against content hash f56878e39639, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade C, and why

Fetchium CLAUDE.md scanned grade C with 2 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.

Downloads and executes remote codehighSupply chain

curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

CLAUDE.md · 232 lines

How it starts

The opening of the file, as written. The whole thing — 232 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.

Build Commands

# Check all crates compile (fast, no linking)
cargo check

# Build the fetchium binary
cargo build -p fetchium-cli

# Build optimized release binary
cargo build -p fetchium-cli --release

# Run the binary
./target/debug/fetchium --help
./target/debug/fetchium doctor

# Run all tests
cargo test

# Run tests for a specific crate
cargo test -p fetchium-core
cargo test -p fetchium-cli

# Run a single test by name
cargo test -p fetchium-core extract::layer1::tests::extract_simple_page

# Lint (zero warnings policy — treat warnings as errors in CI)
cargo clippy -- -D warnings

# Format
cargo fmt

# Generate docs
cargo doc --open

macOS SDK Note

Xcode on this machine sometimes defaults to the iPhoneOS SDK, which breaks C dependency compilation (zstd-sys, rusqlite, ring). This is fixed in .cargo/config.toml which forces SDKROOT to the macOS SDK. If you see "architecture not supported" errors, run:

export SDKROOT=$(xcrun --sdk macosx --show-sdk-path)

Architecture Overview

Fetchium is a Cargo workspace with 4 crates:

Crate	Role
`fetchium-core`	All algorithms: search, extract, rank, validate, cache, AI, intelligence
`fetchium-cli`	The `fetchium` binary — clap derive CLI, delegates everything to fetchium-core
`fetchium-mcp`	MCP server (Phase 4) — exposes fetchium-core as Model Context Protocol tools
`fetchium-api`	REST API server via axum (Phase 4)

Data flow: CLI command → FetchiumConfig → fetchium-core pipeline → formatted output

The CLI (fetchium-cli/src/main.rs) parses args, loads config, then dispatches to one file per command in crates/fetchium-cli/src/commands/. Each command calls into fetchium-core modules.

fetchium-core Module Map

The retrieval pipeline is implemented across these modules. Foundational types/config:

types.rs — Shared data types: AgentSearchResult, SearchResult, ResultItem, Segment, Finding, Source, EvidenceGraph, CepLayer, PdsTier, ResourceTier, BackendId, etc.
error.rs — FetchiumError, StructuredError, ErrorKind, FetchiumResult<T>
config.rs — FetchiumConfig loaded from ~/.fetchium/config.toml with env var overrides; includes detect_resource_tier() and data_dir()
http/client.rs — HttpClient (reqwest with pooling/retries)
resource/mod.rs — detect_tier() delegating to FetchiumConfig::detect_resource_tier()

Read the full file on GitHub · 232 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.

2mo ago First seen · 232 lines · 2,643 tokens per session scan C f56878e39639

Subscribe to this mod's changes

Fetchium CLAUDE.md is an instructions file published in the GitHub repository zuhabul/Fetchium (4 stars, last pushed 4mo ago), licensed Apache-2.0. It adds 2,643 tokens to every session, about $0.0106 per session on Opus 5.5. A static security scan graded it C with 2 findings (downloads and executes remote code, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

LLM ai cli mcp open-source

Fetchium CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
Fetchium CLAUDE.mdzuhabul/Fetchium	Instructions file	4	4mo ago	Apache-2.0	C	2,643	Claude Code
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Fetchium: Instructions file for Claude Code