Call a specific MCP tool on a running Next.js development server. REQUIREMENTS: - Port number of the target Next.js dev server - Tool name to execute - Optional arguments object (if the tool requires parameters) Use 'nextjs_index' first to discover available servers, tools, and their input sche...
Single-target operation
Part of the Midnight Nextjs MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.
AI agents may call nextjs_call to permanently remove or destroy resources in Midnight Nextjs. Without a policy, an autonomous agent could delete critical data in a loop with no way to undo the damage. Intercept blocks destructive tools by default and requires explicit human approval before enabling them.
Without a policy, an AI agent could call nextjs_call in a loop, permanently destroying resources in Midnight Nextjs. There is no undo for destructive operations. Intercept blocks this tool by default and only allows it when a human explicitly approves the action.
Destructive tools permanently remove data. Block by default. Only enable with explicit approval workflows.
tools:
nextjs_call:
rules:
- action: deny
reason: "Blocked by default — enable with approval"See the full Midnight Nextjs policy for all 35 tools.
Agents calling destructive-class tools like nextjs_call have been implicated in these attack patterns. Read the full case and prevention policy for each:
Other tools in the Destructive risk category across the catalogue. The same policy patterns (deny, require_approval) apply to each.
nextjs_call is one of the critical-risk operations in Midnight Nextjs. For the full severity-focused view — only the critical-risk tools with their recommended policies — see the breakdown for this server, or browse all critical-risk tools across every MCP server.
Call a specific MCP tool on a running Next.js development server. REQUIREMENTS: - Port number of the target Next.js dev server - Tool name to execute - Optional arguments object (if the tool requires parameters) Use 'nextjs_index' first to discover available servers, tools, and their input schemas. If 'nextjs_index' auto-discovery fails, ask the user for the port and call 'nextjs_index' again with the 'port' parameter. IMPORTANT: When calling tools: - The 'args' parameter MUST be an object (e.g., {key: "value"}), NOT a string - If a tool doesn't require arguments, OMIT the 'args' parameter entirely - do NOT pass {} or "{}" - Check the tool's inputSchema from 'nextjs_index' to see what arguments are required Common Next.js MCP tools include: - Error diagnostics (get compilation/runtime errors) - Route information (list all routes) - Build status (check compilation state) - Cache management (clear caches) - And more (varies by Next.js version) Example usage: 1. Call 'nextjs_index' to see servers and tools 2. Call 'nextjs_call' with port=3000, toolName="get_errors" to get errors from server on port 3000. It is categorised as a Destructive tool in the Midnight Nextjs MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Add a rule in your Intercept YAML policy under the tools section for nextjs_call. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Midnight Nextjs MCP server.
nextjs_call is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the nextjs_call rule in your Intercept 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 Intercept policy for nextjs_call. 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.
nextjs_call is provided by the Midnight Nextjs MCP server (midnight-nextjs-mcp). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic policy on every MCP tool call. Per-identity grants. Full audit log.