What is semrush-mcp CLAUDE.md?

Project guidance for Semrush MCP, a server and command-line tool that provides Semrush data for keyword research, website analysis, backlinks, traffic, and competitor research. MCP is a standard way for AI clients to call external tools.

Use it when developing or checking the Semrush server or CLI, running unit or integration tests, validating TypeScript, or working with its Git hooks.

It clarifies how to install, build, test, lint, format, and publish the project while separating tests that need an API key from those that do not.

semrush-mcp CLAUDE.md — Instructions file for coding agents by mrkooblu: Project guidance for Semrush MCP, a server and command-line…

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add instructions/mrkooblu/semrush-mcp/claude-md

Clone the repo

git clone --depth 1 https://github.com/mrkooblu/semrush-mcp

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/mrkooblu/semrush-mcp/claude-md.svg)](https://agentmods.dev/instructions/mrkooblu/semrush-mcp/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/mrkooblu/semrush-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/mrkooblu/semrush-mcp/claude-md.svg" alt="Measured on agentmods" height="20"></a>

Per session 920 This file is loaded in full into every session.

When invoked 920 The same file — it is already loaded in full.

Security scan A 0 findings. Scan, not verified.

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	$0.00920	$0.00920
Opus 5	$0.00460	$0.00460
Sonnet 5	$0.00184	$0.00184
Haiku 4.5	$0.00092	$0.00092

Measured 5d ago against content hash 4fab2a618635, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

semrush-mcp 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 5d 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 · 105 lines

How it starts

The opening of the file, as written. The whole thing — 105 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 when working with code in this repository.

Project Overview

semrush-mcp is a unified Semrush MCP server and CLI for keyword research, domain analytics, backlinks, traffic analysis, and competitive intelligence. It provides two entry points that share the same API client:

semrush-mcp — MCP server (stdio transport) for AI clients (Claude, Cursor, etc.)
semrush — CLI for direct terminal usage

Commands

# Development
npm install          # Install dependencies
npm run build        # Build TypeScript to dist/
npm run dev          # Start MCP server in dev mode (tsx)
npm run start        # Start built MCP server

# Testing
npm test             # Run all tests
npm run test:unit    # Unit tests only (mocked, no API key needed)
npm run test:integration  # Integration tests (requires SEMRUSH_API_KEY)

# Quality
npm run lint         # ESLint
npm run format       # Prettier format

Git Hooks

Pre-commit and pre-push hooks are installed via Husky.

Pre-commit runs:

lint-staged (prettier + eslint auto-fix on staged .ts files)
ESLint (full lint pass)
TypeScript type-check (tsc --noEmit)
Unit tests (excludes integration tests)
Secret detection (scans for hardcoded API keys/tokens)

Pre-push runs:

Uncommitted changes check
Full build (npm run build)
Integration tests (requires SEMRUSH_API_KEY)

Architecture

src/
├── index.ts          # MCP server entry point (McpServer API)
├── cli.ts            # CLI entry point (Commander.js)
├── semrush-api.ts    # Shared API client (singleton via lazy Proxy)
├── schemas.ts        # Zod validation schemas + inferred TS types
├── config.ts         # Configuration, logger, env loading
└── __tests__/        # Test suite (unit + integration)

Key patterns:

semrushApi is a lazy Proxy singleton — import it, never construct SemrushApiClient directly (except in tests)
The API client handles retries (429/5xx), caching, and rate limiting internally
SemrushApiError has .status and .response fields for error handling

Read the full file on GitHub · 105 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.

5d ago First seen · 105 lines · 920 tokens per session scan A 4fab2a618635

Subscribe to this mod's changes

semrush-mcp CLAUDE.md is an instructions file published in the GitHub repository mrkooblu/semrush-mcp (39 stars, last pushed 5mo ago), licensed MIT. It adds 920 tokens to every session, about $0.0046 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 2026-08-30.

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codex AGENTS.md

AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.

openai/codex · 5,182 tokens

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).

microsoft/vscode · 6,785 tokens

semrush-mcp CLAUDE.md