This record as markdown: /tools/com-local-mcp-local-mcp/excel-write-cell.md
What excel_write_cell does on Local
AI agents use excel_write_cell to create or update resources in Local, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Local environment.
| Parameter | Type | Required | Description |
|---|---|---|---|
row | integer | Yes | Row number (1-based) |
path | string | Yes | Path to the .xlsx file |
value | string | Yes | Value to write |
column | integer | Yes | Column number (1-based) |
confirm | boolean | — | Must be true to modify |
sheet_name | string | — | Sheet name (default: first sheet) |
Parameters from the server's own tool schema.
Why excel_write_cell is rated Medium
This tool modifies data in Excel files by writing values to cells. This is a reversible operation (cells can be edited or undone), so it falls under Write rather than Destructive. The severity is medium because misuse could corrupt spreadsheets or manipulate financial/business data, but the operation is not irreversible and depends on the specific cell targeted.
From the tool's definition Tool name is 'excel_write_cell' and description states 'Writes a value to a specific cell in an Excel file.' The verb 'writes' indicates creation or modification of data.
Risk signalsAccepts file system path (path)
Attacks that exploit this kind of access
The rule that runs excel_write_cell safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Local, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For excel_write_cell, this is the rule to start with:
excel_write_cell 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 Local, apply this rule, and every excel_write_cell call is checked against it from then on.
Questions about excel_write_cell
Writes a value to a specific cell in an Excel file. It is categorised as a Write tool in the Local MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
excel_write_cell accepts 6 parameters: row, path, value, column, confirm, sheet_name. Required: row, path, value, column. The full parameter table on this page comes from the server's own tool schema.
Register the Local MCP server in PolicyLayer and add a rule for excel_write_cell: 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 Local. Nothing to install.
excel_write_cell 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 excel_write_cell 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 excel_write_cell. 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.
excel_write_cell is provided by the Local MCP server (local-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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