register_component
Register a UI component in the dive tree. Components form a hierarchy: page → section → form/modal/list → button/input/link. Set parentId to nest under an existing component (null for top-level). The main agent registers the initial tree, then subagents can add child components they discover duri...
This record as markdown: /tools/io-github-homenshum-nodebench/register-component.md
What register_component does on Nodebench
AI agents use register_component to create or update resources in Nodebench, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Nodebench environment.
Why register_component is rated Medium
This tool creates and modifies data (UI component registry) in a structured hierarchy. It establishes relationships between components but does not execute code, trigger external operations, or permanently delete anything. The impact is limited to the internal component tracking system used for UI traversal workflows.
From the tool's definition Tool registers/creates UI components in a dive tree hierarchy with parent-child relationships. The description explicitly states it sets parentId to nest components and returns component_id for subsequent operations, indicating reversible creation of tree…
Attacks that exploit this kind of access
The rule that runs register_component safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Nodebench, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For register_component, this is the rule to start with:
register_component 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Nodebench, apply this rule, and every register_component call is checked against it from then on.
Questions about register_component
Register a UI component in the dive tree. Components form a hierarchy: page → section → form/modal/list → button/input/link. Set parentId to nest under an existing component (null for top-level). The main agent registers the initial tree, then subagents can add child components they discover during traversal. Returns the component_id for use in start_component_flow and log_interaction. It is categorised as a Write tool in the Nodebench MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Nodebench MCP server in PolicyLayer and add a rule for register_component: 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 Nodebench. Nothing to install.
register_component 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_component 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_component. 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_component is provided by the Nodebench MCP server (nodebench-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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