NEXUS AEGIS MCP-Sentinel gateway for prompt-injection resistant tool execution
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Part of the aaaa-nexus — Formally Verified AI Safety APIs server.
Free to start. No card required.
AI agents invoke aegis_mcp_proxy_execute to trigger processes or run actions in aaaa-nexus — Formally Verified AI Safety APIs. Execute operations can have side effects beyond the immediate call -- triggering builds, sending notifications, or starting workflows. Rate limits and argument validation are essential to prevent runaway execution.
aegis_mcp_proxy_execute can trigger processes with real-world consequences. An uncontrolled agent might start dozens of builds, send mass notifications, or kick off expensive compute jobs. PolicyLayer enforces rate limits and validates arguments to keep execution within safe bounds.
Execute tools trigger processes. Rate-limit and validate arguments to prevent unintended side effects.
{
"version": "1",
"default": "deny",
"tools": {
"aegis_mcp_proxy_execute": {
"limits": [
{
"counter": "aegis_mcp_proxy_execute_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}See the full aaaa-nexus — Formally Verified AI Safety APIs policy for all 27 tools.
These attack patterns abuse exactly the kind of access aegis_mcp_proxy_execute gives an agent. Each links to the full case and the policy that stops it:
Other execute tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
NEXUS AEGIS MCP-Sentinel gateway for prompt-injection resistant tool execution. It is categorised as a Execute tool in the aaaa-nexus — Formally Verified AI Safety APIs MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the aaaa-nexus — Formally Verified AI Safety APIs MCP server in PolicyLayer and add a rule for aegis_mcp_proxy_execute: 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 aaaa-nexus — Formally Verified AI Safety APIs. Nothing to install.
aegis_mcp_proxy_execute is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the aegis_mcp_proxy_execute 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 aegis_mcp_proxy_execute. 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.
aegis_mcp_proxy_execute is provided by the aaaa-nexus — Formally Verified AI Safety APIs MCP server (https://aaaa-nexus.atomadictech.workers.dev/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 27 aaaa-nexus — Formally Verified AI Safety APIs tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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