Update a subscription action
Risk signalsAccepts URL/endpoint input (__requestBody.webhook) · Accepts file system path (__requestBody.webhook.destination)
Part of the Saber server.
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AI agents use subscription_actions-update to create or modify resources in Saber. 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 subscription_actions-update 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 Saber.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"subscription_actions-update": {
"limits": [
{
"counter": "subscription_actions-update_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Saber policy for all 77 tools.
These attack patterns abuse exactly the kind of access subscription_actions-update 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.
Update a subscription action. It is categorised as a Write tool in the Saber MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Saber MCP server in PolicyLayer and add a rule for subscription_actions-update: 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 Saber. Nothing to install.
subscription_actions-update 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 subscription_actions-update 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 subscription_actions-update. 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.
subscription_actions-update is provided by the Saber MCP server (https://mcp.saber.app/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 77 Saber tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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