Independently grade an MCP server (A–F) BEFORE connecting an agent to it. Returns spec-conformance, security (OWASP MCP Top 10), reliability, tool-hygiene and transparency sub-scores plus a connect/caution/avoid recommendation. Audited by wmcp.sh; the grade is free and never for sale.
Risk signalsAccepts URL/endpoint input (url)
Part of the Trust Oracle server.
Free to start. No card required.
AI agents call grade_mcp_server to retrieve information from Trust Oracle 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 grade_mcp_server 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": {
"grade_mcp_server": {}
}
}See the full Trust Oracle policy for all 3 tools.
These attack patterns abuse exactly the kind of access grade_mcp_server 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.
Independently grade an MCP server (A–F) BEFORE connecting an agent to it. Returns spec-conformance, security (OWASP MCP Top 10), reliability, tool-hygiene and transparency sub-scores plus a connect/caution/avoid recommendation. Audited by wmcp.sh; the grade is free and never for sale.. It is categorised as a Read tool in the Trust Oracle MCP Server, which means it retrieves data without modifying state.
Register the Trust Oracle MCP server in PolicyLayer and add a rule for grade_mcp_server: 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 Trust Oracle. Nothing to install.
grade_mcp_server 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 grade_mcp_server 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 grade_mcp_server. 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.
grade_mcp_server is provided by the Trust Oracle MCP server (https://wmcp.sh/mcp/trust). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 3 Trust Oracle 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.