Add a subscriber to an email sequence
Part of the Kit server.
Free to start. No card required.
AI agents use kit_add_subscriber_to_sequence to create or modify resources in Kit. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call kit_add_subscriber_to_sequence repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Kit.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"kit_add_subscriber_to_sequence": {
"limits": [
{
"counter": "kit_add_subscriber_to_sequence_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Kit policy for all 29 tools.
These attack patterns abuse exactly the kind of access kit_add_subscriber_to_sequence gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Add a subscriber to an email sequence. It is categorised as a Write tool in the Kit MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Kit MCP server in PolicyLayer and add a rule for kit_add_subscriber_to_sequence: 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 Kit. Nothing to install.
kit_add_subscriber_to_sequence is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the kit_add_subscriber_to_sequence 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.
Set action: deny in the PolicyLayer policy for kit_add_subscriber_to_sequence. 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.
kit_add_subscriber_to_sequence is provided by the Kit MCP server (kit-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 29 Kit tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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