24 tools. 24 can modify or destroy data without limits.
24 write tools that can modify data. Rate limits recommended.
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Write operations (cairo-custom, cairo-erc1155, cairo-erc20) modify state. Without rate limits, an agent can make hundreds of changes in seconds — faster than any human can review or revert.
Execute tools (cairo-account, cairo-multisig) trigger processes with side effects. Builds, notifications, workflows — all fired without throttling.
Intercept sits between your agent and Contracts. 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 @openzeppelin/contracts-mcp cairo-custom:
rules:
- rate_limit: 30/hour Prevents bulk unintended modifications from agents caught in loops.
The Contracts server has 22 write tools including cairo-custom, cairo-erc1155, cairo-erc20. 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.
24 tools across 2 categories: Execute, Write. 0 are read-only. 24 can modify, create, or delete data.
One line change. Instead of running the Contracts server directly, prefix it with Intercept: intercept -c contracts.yaml -- npx -y @@openzeppelin/contracts-mcp. Download a pre-built policy from policylayer.com/policies/contracts and adjust the limits to match your use case.
Starter policies available for each. Same risk classification, same one-command setup.
Set budgets, approvals, and hard limits across MCP servers.
npx -y @policylayer/intercept init