AI agents invoke apply_hlookup to trigger actions in Office Editor. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
HLOOKUP is a spreadsheet lookup function. Applying it likely writes a formula to a cell (Write), but could also trigger computation (Execute). Given the empty description, confidence is low. The most severe plausible category given the ambiguity and the server context (Excel editing) is Execute/Write; choosing Execute due to formula execution semantics. Severity is medium as misuse could corrupt spreadsheet data.
From the tool's definition Tool name 'apply_hlookup' suggests applying an HLOOKUP formula/function, but description is empty and uninformative.
Documented attack patterns abuse exactly the kind of access apply_hlookup gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Office Editor, and nothing reaches the server without passing your rules. This is the rule we recommend for apply_hlookup:
{
"version": "1",
"default": "deny",
"tools": {
"apply_hlookup": {
"limits": [
{
"counter": "apply_hlookup_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}apply_hlookup stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
Free to start. No card required.
apply_hlookup. It is categorised as a Execute tool in the Office Editor MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Office Editor MCP server in PolicyLayer and add a rule for apply_hlookup: 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 Office Editor. Nothing to install.
apply_hlookup is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the apply_hlookup 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 apply_hlookup. 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.
apply_hlookup is provided by the Office Editor MCP server (thewdy/office-editor-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 88 Office Editor tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
88 Office Editor tools catalogued and risk-classified — across an index of 42,500+ MCP servers.