AI agents use append_file to create or update resources in Mcp Ssh — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Ssh environment.
This tool modifies an existing remote file by adding content to it. It is a write operation (reversible in principle, as content can be removed), but misuse could corrupt configuration files or logs on remote systems, giving it medium severity.
From the tool's definition Append content to a remote file
Attacks that exploit this kind of access
Append content to a remote file. It is categorised as a Write tool in the Mcp Ssh MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Mcp Ssh MCP server in PolicyLayer and add a rule for append_file: 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 Mcp Ssh. Nothing to install.
append_file 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_file 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_file. 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_file is provided by the Mcp Ssh MCP server (zhouxiangjing/mcp-ssh). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
append_file is one line of Mcp Ssh's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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