Create a contact research signal, return immediately, then poll the signal ID or receive results through a webhook.
Risk signalsHigh parameter count (14 properties)
Part of the Saber server.
Free to start. No card required.
AI agents use contacts-create_signal 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 contacts-create_signal 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": {
"contacts-create_signal": {
"limits": [
{
"counter": "contacts-create_signal_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 contacts-create_signal 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.
Create a contact research signal, return immediately, then poll the signal ID or receive results through a webhook.. 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 contacts-create_signal: 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.
contacts-create_signal 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 contacts-create_signal 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 contacts-create_signal. 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.
contacts-create_signal 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.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.