44 tools. 22 can modify or destroy data without limits.
6 destructive tools with no built-in limits. Policy required.
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Destructive tools (cancel-email, remove-api-key, remove-broadcast) permanently delete resources. There is no undo. An agent calling these in a retry loop causes irreversible damage.
Write operations (create-api-key, create-broadcast, create-contact) 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 Resend. 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 @resend-mcp cancel-email:
rules:
- action: deny Destructive tools should never be available to autonomous agents without human approval.
create-api-key:
rules:
- rate_limit: 30/hour Prevents bulk unintended modifications from agents caught in loops.
get-broadcast:
rules:
- rate_limit: 60/minute Controls API costs and prevents retry loops from exhausting upstream rate limits.
Yes. The Resend server exposes 6 destructive tools including cancel-email, remove-api-key, remove-broadcast. These permanently remove resources with no undo. Intercept blocks destructive tools by default so they never reach the upstream server.
The Resend server has 16 write tools including create-api-key, create-broadcast, create-contact. 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.
44 tools across 3 categories: Destructive, Read, Write. 22 are read-only. 22 can modify, create, or delete data.
One line change. Instead of running the Resend server directly, prefix it with Intercept: intercept -c resend.yaml -- npx -y @@resend-mcp. Download a pre-built policy from policylayer.com/policies/resend 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