List all indexed documents, optionally filtered by category. Read-only. No side effects. Args: category: Optional category filter. Must be a valid category name — call list_categories() to see available options (e.g., security, ctf, logscale, development, general, redteam, blueteam). Returns: JSO...
AI agents call list_documents to retrieve information from Knowledge Rag without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool purely queries and returns information about indexed documents with optional category filtering. It has no capability to modify, delete, execute, or trigger external operations. The read-only guarantee and return of metadata-only information clearly place this in the Read category with low severity since exposure poses minimal risk even if misused by an AI agent.
From the tool's definition Tool description explicitly states 'Read-only. No side effects.' and 'List all indexed documents' — retrieves metadata about indexed documents without modification, deletion, or execution.
Documented attack patterns abuse exactly the kind of access list_documents gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Knowledge Rag, and nothing reaches the server without passing your rules. This is the rule we recommend for list_documents:
{
"version": "1",
"default": "deny",
"tools": {
"list_documents": {}
}
}list_documents is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all indexed documents, optionally filtered by category. Read-only. No side effects. Args: category: Optional category filter. Must be a valid category name — call list_categories() to see available options (e.g., security, ctf, logscale, development, general, redteam, blueteam). Returns: JSON string with list of document filepaths, categories, and metadata for each indexed file. Usage: Use to browse what's in the index or verify a specific file is indexed. Use list_categories() first to see valid category names. Use search_knowledge() when you want to find documents by topic rather than browsing the full list. Use get_document() to read a specific file once you have its filepath. It is categorised as a Read tool in the Knowledge Rag MCP Server, which means it retrieves data without modifying state.
Register the Knowledge Rag MCP server in PolicyLayer and add a rule for list_documents: 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 Knowledge Rag. Nothing to install.
list_documents 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 list_documents 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 list_documents. 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.
list_documents is provided by the Knowledge Rag MCP server (lyonzin/knowledge-rag). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Knowledge Rag, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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12 Knowledge Rag tools catalogued and risk-classified — across an index of 43,000+ MCP servers.