Submit a vote in a multi-agent consensus decision process
AI agents use consensus_vote to create or update resources in Nexus Agents — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Nexus Agents environment.
The tool writes/posts a vote into a consensus decision process. It modifies the state of an ongoing multi-agent decision (adds a vote record), which is a reversible write operation. It doesn't execute code, delete data, or move money. Severity is medium because casting votes in a consensus system could influence which AI model output gets accepted or rejected, potentially affecting downstream actions.
From the tool's definition Submit a vote in a multi-agent consensus decision process
Documented attack patterns abuse exactly the kind of access consensus_vote gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Nexus Agents, and nothing reaches the server without passing your rules. This is the rule we recommend for consensus_vote:
{
"version": "1",
"default": "deny",
"tools": {
"consensus_vote": {
"limits": [
{
"counter": "consensus_vote_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}consensus_vote stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Submit a vote in a multi-agent consensus decision process. It is categorised as a Write tool in the Nexus Agents MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Nexus Agents MCP server in PolicyLayer and add a rule for consensus_vote: 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 Nexus Agents. Nothing to install.
consensus_vote is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the consensus_vote 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 consensus_vote. 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.
consensus_vote is provided by the Nexus Agents MCP server (nexus-substrate/nexus-agents). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Nexus Agents, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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