inspect_tool_server
Live-inspect one active, provider-verified, operator-curated public MCP server from the 404.directory catalog. Returns only the remote read-only tools approved for gateway execution, including their current descriptions, JSON input schemas, and annotations. Use after search_tools and before the f...
This record as markdown: /tools/404-directory/inspect-tool-server.md
What inspect_tool_server does on 404 Directory
AI agents call inspect_tool_server to retrieve information from 404 Directory without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why inspect_tool_server is rated Low
Tool retrieves metadata and schemas from curated servers without side effects or code execution.
From the tool's definition Live-inspect active MCP server, returns read-only tools, descriptions, schemas, does not execute
Attacks that exploit this kind of access
The rule that runs inspect_tool_server safely
PolicyLayer is an MCP gateway: it sits between your AI agents and 404 Directory, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For inspect_tool_server, this is the rule to start with:
inspect_tool_server 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 404 Directory, apply this rule, and every inspect_tool_server call is checked against it from then on.
Questions about inspect_tool_server
Live-inspect one active, provider-verified, operator-curated public MCP server from the 404.directory catalog. Returns only the remote read-only tools approved for gateway execution, including their current descriptions, JSON input schemas, and annotations. Use after search_tools and before the first invoke_registered_tool call, or whenever arguments may have changed. This operation does not execute a remote business tool. It is categorised as a Read tool in the 404 Directory MCP Server, which means it retrieves data without modifying state.
Register the 404 Directory MCP server in PolicyLayer and add a rule for inspect_tool_server: 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 404 Directory. Nothing to install.
inspect_tool_server 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 inspect_tool_server 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 inspect_tool_server. 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.
inspect_tool_server is provided by the 404 Directory MCP server (MM-sheng/404-directory). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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