What is neo4j-mcp CLAUDE.md?

Project instructions for an MCP server that connects an agent to Neo4j, a database for storing linked data such as people, companies, and their relationships. They explain the project, its commands, and its graph-database features.

Running the server, querying graph data with Cypher, managing nodes and relationships, finding paths, checking the database schema, and testing in mock mode.

They give the agent the repository context and operating instructions it needs to work with Neo4j consistently.

How lesleslie/neo4j-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to lesleslie/neo4j-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/lesleslie/neo4j-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/lesleslie/neo4j-mcp

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

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Your own site

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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.

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Per session 1,291 This file is loaded in full into every session.

When invoked 1,291 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	$0.01291	$0.01291
Opus 5.5	$0.00516	$0.00516
Sonnet 5.5	$0.00258	$0.00258
Haiku 4.5	$0.00129	$0.00129

Measured 1mo ago against content hash e67fe080f8f9, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

neo4j-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 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 · 160 lines

How it starts

The opening of the file, as written. The whole thing — 160 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 this repository.

For a shorter, tool-neutral bootstrap document, start with AGENTS.md.

Project Overview

neo4j-mcp is an MCP server for Neo4j graph database operations, providing graph query and node/relationship management, and path finding capabilities via the Model Context Protocol.

Key Dependencies: Python 3.13+, mcp-common, neo4j-driver

Core Features

Cypher Queries: Execute Cypher queries with parameterized inputs
Node Operations: Create, get, delete, find nodes
Relationship Operations: Create and delete relationships
Path Finding: Find paths between nodes
Schema Inspection: Get database schema info
Mock Mode: Testing without real Neo4j instance

Most Common Commands

The CLI is built via mcp-common's MCPServerCLIFactory and exposes the standard MCP lifecycle surface (no per-flag subcommands). Connection overrides are environment variables, not CLI flags.

# Start the managed HTTP MCP server
uv run neo4j-mcp start

# Stop / restart / status / health probes
uv run neo4j-mcp stop
uv run neo4j-mcp restart
uv run neo4j-mcp status
uv run neo4j-mcp health

# Custom connection details via environment variables
NEO4J_MCP_URI=bolt://localhost:7687 \
NEO4J_MCP_DATABASE=neo4j \
    uv run neo4j-mcp start

# Mock mode (no live Neo4j required)
NEO4J_MCP_MOCK_MODE=true uv run neo4j-mcp start

Critical Rules

1. SECURITY IS NON-NEGOTIABLE

NEVER expose database passwords in code
ALWAYS use environment variables for credentials
NEVER log credential values
ALWAYS sanitize Cypher query inputs to prevent injection

2. NEO4J CONNECTION MANAGEMENT

Use connection pooling for performance
Handle connection errors gracefully
Close connections properly in cleanup

3. NO PLACEHOLDERS - EVER

NEVER use dummy node IDs or placeholder data
ALWAYS use proper variable references

Read the full file on GitHub · 160 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 · +20 lines · +206 tokens per session e67fe080f8f9
2mo ago First seen · 140 lines · 1,085 tokens per session scan A da631abcbd14

Subscribe to this mod's changes

neo4j-mcp CLAUDE.md is an instructions file published in the GitHub repository lesleslie/neo4j-mcp (1 stars, last pushed 1mo ago), licensed BSD-3-Clause. It adds 1,291 tokens to every session, about $0.0052 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.

Databases

neo4j-mcp CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
neo4j-mcp CLAUDE.mdlesleslie/neo4j-mcp	Instructions file	1	1mo ago	BSD-3-Clause	A	1,291	Claude Code
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	today	MIT	A	7,461	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	5,649	GitHub Copilot
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	today	MIT	A	4,680	Codex, OpenCode
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	3,093	GitHub Copilot
vscode model-prompts.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	2,022	GitHub Copilot

neo4j-mcp: Instructions file for Claude Code