ADVANCED: Update contact with raw vCard data. Requires manual vCard formatting - use update_contact instead for simple field updates (name, email, phone). Only use this if you have complete pre-formatted vCard data or need to update advanced vCard properties.
Part of the Dav server.
Free to start. No card required.
AI agents use update_contact_raw to create or modify resources in Dav. 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 update_contact_raw 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 Dav.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"update_contact_raw": {
"limits": [
{
"counter": "update_contact_raw_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Dav policy for all 26 tools.
These attack patterns abuse exactly the kind of access update_contact_raw 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.
ADVANCED: Update contact with raw vCard data. Requires manual vCard formatting - use update_contact instead for simple field updates (name, email, phone). Only use this if you have complete pre-formatted vCard data or need to update advanced vCard properties.. It is categorised as a Write tool in the Dav MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Dav MCP server in PolicyLayer and add a rule for update_contact_raw: 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 Dav. Nothing to install.
update_contact_raw 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 update_contact_raw 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 update_contact_raw. 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.
update_contact_raw is provided by the Dav MCP server (dav-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 26 Dav 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.