Bulk update metadata for multiple annotations.
AI agents use onui_bulk_update_annotation_metadata to create or update resources in onUI — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your onUI environment.
This tool creates or modifies annotation metadata in a reversible manner. It does not execute code, delete data irreversibly, or involve financial operations. The 'bulk' aspect increases severity to medium due to wider potential blast radius affecting multiple annotations at once, but it remains a Write operation since metadata updates are generally reversible.
From the tool's definition Tool name contains 'bulk_update' and description states 'Bulk update metadata for multiple annotations', indicating it modifies annotation data.
Documented attack patterns abuse exactly the kind of access onui_bulk_update_annotation_metadata gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and onUI, and nothing reaches the server without passing your rules. This is the rule we recommend for onui_bulk_update_annotation_metadata:
{
"version": "1",
"default": "deny",
"tools": {
"onui_bulk_update_annotation_metadata": {
"limits": [
{
"counter": "onui_bulk_update_annotation_metadata_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}onui_bulk_update_annotation_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.
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Bulk update metadata for multiple annotations. It is categorised as a Write tool in the onUI MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the onUI MCP server in PolicyLayer and add a rule for onui_bulk_update_annotation_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 onUI. Nothing to install.
onui_bulk_update_annotation_metadata 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 onui_bulk_update_annotation_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.
Set action: deny in the PolicyLayer policy for onui_bulk_update_annotation_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.
onui_bulk_update_annotation_metadata is provided by the onUI MCP server (onllm-dev/onui). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 8 onUI tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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8 onUI tools catalogued and risk-classified — across an index of 42,500+ MCP servers.