Write values to specific cells. Supports both ID-based and name-based targeting: use lineItemName/dimensionName/itemName instead of IDs to skip the dimension resolution chain. For ID-based writes, use show_lineitem_dimensions then show_dimensionitems.
AI agents use write_cells to create or update resources in Anaplan MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Anaplan MCP environment.
This tool modifies existing data in Anaplan model cells. It is classified as Write rather than Execute because it directly alters data values rather than running arbitrary code or commands. It is not Destructive because cell value updates are reversible.
From the tool's definition Tool name is 'write_cells' and description states 'Write values to specific cells', indicating data modification capability. The tool enables writing/updating cell values in Anaplan models, which is reversible data alteration.
Documented attack patterns abuse exactly the kind of access write_cells gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Anaplan MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for write_cells:
{
"version": "1",
"default": "deny",
"tools": {
"write_cells": {
"limits": [
{
"counter": "write_cells_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}write_cells 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.
Free to start. No card required.
Write values to specific cells. Supports both ID-based and name-based targeting: use lineItemName/dimensionName/itemName instead of IDs to skip the dimension resolution chain. For ID-based writes, use show_lineitem_dimensions then show_dimensionitems. It is categorised as a Write tool in the Anaplan MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Anaplan MCP server in PolicyLayer and add a rule for write_cells: 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 Anaplan MCP. Nothing to install.
write_cells 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 write_cells 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 write_cells. 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.
write_cells is provided by the Anaplan MCP server (larasrinath/anaplan-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Anaplan MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
70 Anaplan MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.