Fuzzy-match a name, phone number, or email to a contact record. Uses multi-level resolution: exact match, digits, fuzzy, and macOS AddressBook.
Part of the iMessage MCP server.
Free to start. No card required.
AI agents use resolve_contact to create or modify resources in iMessage MCP. 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 resolve_contact 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 iMessage MCP.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"resolve_contact": {
"limits": [
{
"counter": "resolve_contact_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full iMessage MCP policy for all 25 tools.
These attack patterns abuse exactly the kind of access resolve_contact 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.
Fuzzy-match a name, phone number, or email to a contact record. Uses multi-level resolution: exact match, digits, fuzzy, and macOS AddressBook.. It is categorised as a Write tool in the iMessage MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the iMessage MCP server in PolicyLayer and add a rule for resolve_contact: 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 iMessage MCP. Nothing to install.
resolve_contact 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 resolve_contact 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 resolve_contact. 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.
resolve_contact is provided by the iMessage MCP server (imessage-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 25 iMessage MCP 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.