Core dossier check: Retrieve and parse a domain's DMARC policy from its _dmarc.<domain> TXT record, returning all tags. Use to audit email authentication policy, verify the p (policy) and rua (reporting) settings, or confirm alignment mode; pair with dossier_spf and dossier_dkim for complete emai...
Part of the Drwho Me developer tools server.
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AI agents call dossier_dmarc to retrieve information from Drwho Me developer tools without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though dossier_dmarc only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"dossier_dmarc": {}
}
}See the full Drwho Me developer tools policy for all 19 tools.
These attack patterns abuse exactly the kind of access dossier_dmarc gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Core dossier check: Retrieve and parse a domain's DMARC policy from its _dmarc.<domain> TXT record, returning all tags. Use to audit email authentication policy, verify the p (policy) and rua (reporting) settings, or confirm alignment mode; pair with dossier_spf and dossier_dkim for complete email-auth coverage. Queries _dmarc.<domain> via Cloudflare DoH (1.1.1.1), 5 s timeout; parses each tag=value pair. Returns a CheckResult: on success, {status:"ok", raw, tags:{p, rua, ruf, adkim, aspf,...}}; on failure, {status:"error", reason}.. It is categorised as a Read tool in the Drwho Me developer tools MCP Server, which means it retrieves data without modifying state.
Register the Drwho Me developer tools MCP server in PolicyLayer and add a rule for dossier_dmarc: 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 Drwho Me developer tools. Nothing to install.
dossier_dmarc is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the dossier_dmarc 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 dossier_dmarc. 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.
dossier_dmarc is provided by the Drwho Me developer tools MCP server (https://drwho.me/mcp/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 19 Drwho Me developer tools tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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