tail_logs
Tail log files or system logs (journalctl on Linux, system.log on macOS).
This record as markdown: /tools/io-github-kivanccakmak-yaver/tail-logs.md
What tail_logs does on Yaver
AI agents call tail_logs 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 | — | Log file path (default: system logs) |
lines | integer | — | Number of lines (default: 100) |
Parameters from the server's own tool schema.
Why tail_logs is rated Low
Tailing logs retrieves historical or real-time log data for observation and debugging. This is a non-destructive read operation with no side effects, no code execution capability, and no data modification. The blast radius of misuse is low—an agent could read sensitive information from logs, but cannot alter system state, execute code, or cause damage beyond information disclosure.
From the tool's definition Tool description states 'Tail log files or system logs' — the verb 'tail' is a read-only operation that retrieves and displays log output without modification or execution of commands.
Risk signalsAccepts file system path (path)
Attacks that exploit this kind of access
The rule that runs tail_logs 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 tail_logs, this is the rule to start with:
tail_logs 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 tail_logs call is checked against it from then on.
Questions about tail_logs
Tail log files or system logs (journalctl on Linux, system.log on macOS). It is categorised as a Read tool in the Yaver MCP Server, which means it retrieves data without modifying state.
tail_logs accepts 2 parameters: path, lines. 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 tail_logs: 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.
tail_logs 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 tail_logs 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 tail_logs. 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.
tail_logs 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.
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