What is webshift CLAUDE.md?

A project instruction file for a Rust web-search library and MCP server, including communication rules, required session setup, project structure, and a reference implementation.

Use it when developing the webshift library, its MCP server, or internal tools, especially for code navigation, porting behavior, and repository-specific workflows.

It ensures the coding agent loads the project's tooling and context before making changes, which helps keep development aligned with the existing Rust and Python designs.

How x-hannibal/webshift configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to x-hannibal/webshift. 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/x-hannibal/webshift/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/x-hannibal/webshift

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/x-hannibal/webshift/claude-md/github.svg)](https://agentmods.dev/instructions/x-hannibal/webshift/claude-md)

Your own site

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

Per session 1,793 This file is loaded in full into every session.

When invoked 1,793 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	$0.01793	$0.01793
Opus 5.5	$0.00717	$0.00717
Sonnet 5.5	$0.00359	$0.00359
Haiku 4.5	$0.00179	$0.00179

Measured 2mo ago against content hash 98e09c4ddd29, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

webshift 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 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.

CLAUDE.md · 177 lines

How it starts

The opening of the file, as written. The whole thing — 177 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.

Communication

Chat in Italian, develop and document in English.

MANDATORY Session Initialization & Tooling

At the start of every session, run Serena's onboarding process to activate the MCP integration and get access to all LSP-powered tools (code navigation, symbol search, references, diagnostics, etc.). Do this before any coding task — it ensures the full toolset is available and the project context is loaded correctly.

Once Serena is active, always prefer its tools over CLI alternatives.

Project

Native Rust port of mcp-webshift (Python). Denoised web search library and MCP server. Two crates in a workspace:

webshift — library crate (crates.io). Public API: clean(), fetch(), query(), Config.
webshift-mcp — binary crate (crates.io). MCP server over stdio. Installs as mcp-webshift.
robot — internal dev tool (not published). bump, test, promote, unpromote, publish.

Reference implementation

The Python source lives in ../mcp-webshift/src/mcp_webshift/. Key files to reference when porting:

scraper/cleaner.py — lxml XPath cleaning + text sterilization
scraper/fetcher.py — httpx concurrent fetcher, streaming, UA rotation, retry
tools/query.py — full search pipeline
tools/fetch.py — single page fetch
config.py — Pydantic config with env/toml/CLI resolution
backends/ — 5 search backend implementations
llm/ — OpenAI-compatible client, expander, summarizer
utils/reranker.py — BM25 + LLM reranking
utils/url.py — sanitize, dedup, binary filter

Stack

Rust 2024 edition
tokio — async runtime
reqwest — HTTP client (streaming)
scraper (html5ever) — pure-Rust HTML parsing + CSS selector noise removal
serde + toml — config deserialization
regex — text sterilization
clap — CLI argument parsing
rmcp — MCP server SDK (official Anthropic Rust SDK, 1.x stable)
serde_json — JSON output

Read the full file on GitHub · 177 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 · 177 lines · 1,793 tokens per session scan A 98e09c4ddd29

Subscribe to this mod's changes

webshift CLAUDE.md is an instructions file published in the GitHub repository x-hannibal/webshift (8 stars, last pushed 6mo ago), licensed MIT. It adds 1,793 tokens to every session, about $0.0072 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.

Research ai-agents bing-search bm25 brave-search context-window denoiser

webshift CLAUDE.md next to 6 instructions from other repositories
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webshift: Instructions file for Claude Code