append_docx
Append text content to an existing document.
This record as markdown: /tools/andrew82106-llm-docx-agent-mcp/append-docx.md
What append_docx does on Docx
AI agents use append_docx to create or update resources in Docx, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Docx environment.
Why append_docx is rated Medium
This tool creates or modifies data in a reversible manner by appending text to a Word document. It does not delete, execute arbitrary code, or commit financial transactions. The severity is medium because appending text to documents could be misused to inject malicious content, alter agreements, or corrupt document integrity, but the damage is potentially reversible by editing or undoing changes.
From the tool's definition Tool name 'append_docx' and description 'Append text content to an existing document' indicate modification of an existing document. The word 'append' explicitly describes a write operation that adds content reversibly.
Attacks that exploit this kind of access
The rule that runs append_docx safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Docx, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For append_docx, this is the rule to start with:
append_docx 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 Docx, apply this rule, and every append_docx call is checked against it from then on.
Questions about append_docx
Append text content to an existing document. It is categorised as a Write tool in the Docx MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Docx MCP server in PolicyLayer and add a rule for append_docx: 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 Docx. Nothing to install.
append_docx 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 append_docx 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 append_docx. 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.
append_docx is provided by the Docx MCP server (andrew82106/llm_docx_agent_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
More on Docx, and thousands of servers like it.
This server
Across the catalogue