This record as markdown: /tools/io-github-kivanccakmak-yaver/df.md
What df does on Yaver
AI agents call df to retrieve information from Yaver without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
path | string | — |
Parameters from the server's own tool schema.
Why df is rated Low
The df tool retrieves disk space usage statistics, a read-only operation with no side effects. It presents system information to the user without creating, modifying, deleting, or executing any operations. The low severity reflects minimal blast radius even if called unexpectedly by an agent.
From the tool's definition Tool named 'df' with description 'Show disk space usage.' – a standard Unix/Linux utility that reads and displays filesystem information without modifying or executing anything.
Risk signalsAccepts file system path (path)
Attacks that exploit this kind of access
The rule that runs df safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Yaver, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For df, this is the rule to start with:
df is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Yaver, apply this rule, and every df call is checked against it from then on.
Questions about df
Show disk space usage. It is categorised as a Read tool in the Yaver MCP Server, which means it retrieves data without modifying state.
df accepts 1 parameter: path. The full parameter table on this page comes from the server's own tool schema.
Register the Yaver MCP server in PolicyLayer and add a rule for df: 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 Yaver. Nothing to install.
df is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the df 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 df. 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.
df is provided by the Yaver MCP server (yaver-cli). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
More on Yaver, and thousands of servers like it.
This server
Across the catalogue