4 tools. 1 can modify or destroy data without limits.
1 write tool that can modify data. Rate limits recommended.
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Write operations (write-cypher) modify state. Without rate limits, an agent can make hundreds of changes in seconds — faster than any human can review or revert.
Intercept sits between your agent and Neo4j. Every tool call checked against your policy before it executes — so your agent can do its job without breaking things.
npx -y @policylayer/intercept scan -- npx -y @neo4j/mcp write-cypher:
rules:
- rate_limit: 30/hour Prevents bulk unintended modifications from agents caught in loops.
get-schema:
rules:
- rate_limit: 60/minute Controls API costs and prevents retry loops from exhausting upstream rate limits.
The Neo4j server has 1 write tools including write-cypher. Set rate limits in your policy file -- for example, rate_limit: 10/hour prevents an agent from making more than 10 modifications per hour. Intercept enforces this at the transport layer.
4 tools across 2 categories: Read, Write. 3 are read-only. 1 can modify, create, or delete data.
One line change. Instead of running the Neo4j server directly, prefix it with Intercept: intercept -c neo4j.yaml -- npx -y @@neo4j/mcp. Download a pre-built policy from policylayer.com/policies/neo4j and adjust the limits to match your use case.
Set budgets, approvals, and hard limits across MCP servers.
npx -y @policylayer/intercept init