write-age-cypher · AGE-MCP-Server MCP: Risk & Policy

WHAT IT DOES

What write-age-cypher does on AGE-MCP-Server

AI agents use write-age-cypher to create or update resources in AGE-MCP-Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your AGE-MCP-Server environment.

WHY IT NEEDS A POLICY

Why write-age-cypher needs a policy

This tool creates or modifies data reversibly through Cypher query execution against an Apache AGE graph database. While 'write' operations can include updates and inserts that are theoretically reversible, the high severity reflects the potential blast radius: an AI agent with unconstrained access could modify critical graph relationships, node properties, or business data at scale.

From the tool's definition Tool name explicitly states 'write-age-cypher' and description confirms 'Execute a write Cypher query'. The tool is designed to modify graph data in PostgreSQL via AGE.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

write-age-cypher Rate-limited

write-age-cypher stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "write-age-cypher": {
      "limits": [
        {
          "counter": "write-age-cypher_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches AGE-MCP-Server, so you can run agents against it safely.

FAQ

Questions about write-age-cypher

What does the write-age-cypher tool do? +

Execute a write Cypher query on the AGE. It is categorised as a Write tool in the AGE-MCP-Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on write-age-cypher? +

Register the AGE-MCP-Server MCP server in PolicyLayer and add a rule for write-age-cypher: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches AGE-MCP-Server. Nothing to install.

What risk level is write-age-cypher? +

write-age-cypher is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit write-age-cypher? +

Yes. Add a rate_limit block to the write-age-cypher rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block write-age-cypher completely? +

Set action: deny in the PolicyLayer policy for write-age-cypher. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides write-age-cypher? +

write-age-cypher is provided by the AGE-MCP-Server MCP server (rioriost/age_mcp_server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.