set_metadata

Set or update agent metadata key-value pair on Identity Registry

SERVERWaiaas SOURCEminhoyoo-iotrust/waiaas

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/minhoyoo-iotrust-waiaas/set-metadata.md

WHAT IT DOES

What set_metadata does on Waiaas

AI agents use set_metadata 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.

RISK

Why set_metadata is rated Medium

The tool modifies metadata on an Identity Registry, which is a data mutation operation. While not destructive (changes can be reversed), it goes beyond read-only access. Severity is medium rather than high because metadata updates have limited blast radius compared to financial operations or destructive actions on this wallet server.

From the tool's definition Tool description explicitly states 'Set or update agent metadata key-value pair', which are write operations that create or modify data reversibly.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs set_metadata safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Waiaas, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For set_metadata, this is the rule to start with:

set_metadata Rate-limited

set_metadata 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "set_metadata": {
      "limits": [
        {
          "counter": "set_metadata_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Waiaas, apply this rule, and every set_metadata call is checked against it from then on.

FAQ

Questions about set_metadata

What does the set_metadata tool do? +

Set or update agent metadata key-value pair 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.

How do I enforce a policy on set_metadata? +

Register the Waiaas MCP server in PolicyLayer and add a rule for set_metadata: 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.

What risk level is set_metadata? +

set_metadata is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit set_metadata? +

Yes. Add a rate_limit block to the set_metadata 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.

How do I block set_metadata completely? +

Set action: deny in the PolicyLayer policy for set_metadata. 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.

What MCP server provides set_metadata? +

set_metadata 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.

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