Check what is needed to reach a specific Crescendo status tier, or see the full progression path. Shows NCTR lock thresholds, multipliers, and perks for each tier.
Part of the Nctr server.
Free to start. No card required.
AI agents call check_tier_requirements to retrieve information from Nctr 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 check_tier_requirements 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": {
"check_tier_requirements": {}
}
}See the full Nctr policy for all 6 tools.
These attack patterns abuse exactly the kind of access check_tier_requirements 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.
Check what is needed to reach a specific Crescendo status tier, or see the full progression path. Shows NCTR lock thresholds, multipliers, and perks for each tier.. It is categorised as a Read tool in the Nctr MCP Server, which means it retrieves data without modifying state.
Register the Nctr MCP server in PolicyLayer and add a rule for check_tier_requirements: 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 Nctr. Nothing to install.
check_tier_requirements 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_tier_requirements 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_tier_requirements. 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_tier_requirements is provided by the Nctr MCP server (Hoya25/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 6 Nctr tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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