Regex/keyword search within a single document. Returns matches with
AI agents call doc_grep to retrieve information from MinerU Document Explorer without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
doc_grep is a search tool that retrieves matching text from documents without creating, modifying, deleting, or executing operations. It has read-only semantics and minimal blast radius if misused by an AI agent.
From the tool's definition Tool description states 'Regex/keyword search within a single document. Returns matches with' - performs search/retrieval operation with no modification capability.
Documented attack patterns abuse exactly the kind of access doc_grep gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MinerU Document Explorer, and nothing reaches the server without passing your rules. This is the rule we recommend for doc_grep:
{
"version": "1",
"default": "deny",
"tools": {
"doc_grep": {}
}
}doc_grep is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Regex/keyword search within a single document. Returns matches with. It is categorised as a Read tool in the MinerU Document Explorer MCP Server, which means it retrieves data without modifying state.
Register the MinerU Document Explorer MCP server in PolicyLayer and add a rule for doc_grep: 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 MinerU Document Explorer. Nothing to install.
doc_grep 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 doc_grep 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 doc_grep. 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.
doc_grep is provided by the MinerU Document Explorer MCP server (opendatalab/mineru-document-explorer). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 15 MinerU Document Explorer tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
15 MinerU Document Explorer tools catalogued and risk-classified — across an index of 42,500+ MCP servers.