AI agents use register_agent to create or update resources in Todos — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Todos environment.
This is a Write operation: it creates a new agent record with persistent state (name registration). It is reversible (agents can be deregistered or updated). The severity is medium because misuse could create spurious agent identities that pollute the system or cause confusion in task assignment, but it does not irreversibly delete data, execute arbitrary code, or move money.
From the tool's definition Tool registers/creates an agent identity by accepting a 'distinctive one-word name' parameter, which creates a new agent record in the task management system. The word 'register' and the action of storing agent metadata constitutes data creation.
Attacks that exploit this kind of access
Register an agent with a distinctive one-word name. Generic/generated names like agent, agent-1, assistant, or worker-2 are rejected. Prefer Roman or Greek names from suggest_agent_name. It is categorised as a Write tool in the Todos MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Todos MCP server in PolicyLayer and add a rule for register_agent: 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 Todos. Nothing to install.
register_agent 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 register_agent 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 register_agent. 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.
register_agent is provided by the Todos MCP server (@hasna/todos). 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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