Instead of spawning the dev server, parse an existing log file the user redirects
AI agents call attach_log to retrieve information from Nextjs Agent without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool reads/parses an existing log file rather than spawning or modifying anything. It is a read-only operation with minimal blast radius since it only consumes already-existing log data.
From the tool's definition 'parse an existing log file the user redirects' — the tool reads and parses an existing log file without modifying it
Attacks that exploit this kind of access
Instead of spawning the dev server, parse an existing log file the user redirects. It is categorised as a Read tool in the Nextjs Agent MCP Server, which means it retrieves data without modifying state.
Register the Nextjs Agent MCP server in PolicyLayer and add a rule for attach_log: 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 Nextjs Agent. Nothing to install.
attach_log 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 attach_log 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 attach_log. 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.
attach_log is provided by the Nextjs Agent MCP server (zohaib3249/nextjs-agent-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
attach_log is one line of Nextjs Agent's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
Teams ship this data inside their own products. See what a licence covers →