Read-only BIMI readiness check. Validates the default._bimi TXT record, fetches and validates the referenced SVG Tiny PS logo (size, profile, embedded RaSt), and verifies the optional VMC/CMC mark certificate URL chain and trademark issuer. Returns parsed BIMI tags (l, a), logo profile compliance...
AI agents call check_bimi to retrieve information from Intodns without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs validation and verification of BIMI DNS records and related public assets (SVG logos, certificates). It retrieves and analyzes existing data without creating, modifying, deleting, or executing arbitrary operations. The explicit 'read-only' designation and clarification that it 'only fetches' public resources confirms it belongs in the Read category.
From the tool's definition Tool description explicitly states 'Read-only BIMI readiness check' and 'No auth, no destructive actions; only fetches the public logo + certificate.' The tool validates and parses existing DNS records and public certificate URLs without modifying any data.
Attacks that exploit this kind of access
Read-only BIMI readiness check. Validates the default._bimi TXT record, fetches and validates the referenced SVG Tiny PS logo (size, profile, embedded RaSt), and verifies the optional VMC/CMC mark certificate URL chain and trademark issuer. Returns parsed BIMI tags (l, a), logo profile compliance, certificate validity window, and inbox-vendor readiness (Gmail / Apple Mail / Yahoo). Use before paying for a VMC/CMC and before publishing the DNS record. No auth, no destructive actions; only fetches the public logo + certificate. It is categorised as a Read tool in the Intodns MCP Server, which means it retrieves data without modifying state.
Register the Intodns MCP server in PolicyLayer and add a rule for check_bimi: 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 Intodns. Nothing to install.
check_bimi 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 check_bimi 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 check_bimi. 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.
check_bimi is provided by the Intodns MCP server (rosconl/intodns-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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