Update agent registration file URI on Identity Registry
AI agents use set_agent_uri to create or update resources in Waiaas — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Waiaas environment.
This is a Write operation because it updates data (agent registration URI) in a reversible manner. Severity is medium because while it doesn't directly move funds or execute arbitrary code, modifying agent registration in an identity registry could affect how agents are identified or authenticated in the system, potentially enabling impersonation or routing attacks if an AI agent sets a malicious URI pointing to…
From the tool's definition 'Update agent registration file URI on Identity Registry' indicates the tool modifies an existing registration record by changing its URI reference.
Documented attack patterns abuse exactly the kind of access set_agent_uri gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Waiaas, and nothing reaches the server without passing your rules. This is the rule we recommend for set_agent_uri:
{
"version": "1",
"default": "deny",
"tools": {
"set_agent_uri": {
"limits": [
{
"counter": "set_agent_uri_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}set_agent_uri 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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Update agent registration file URI on Identity Registry. It is categorised as a Write tool in the Waiaas MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Waiaas MCP server in PolicyLayer and add a rule for set_agent_uri: 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 Waiaas. Nothing to install.
set_agent_uri 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 set_agent_uri 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 set_agent_uri. 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.
set_agent_uri is provided by the Waiaas MCP server (minhoyoo-iotrust/waiaas). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Waiaas, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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