AI agents call search_full_docs to retrieve information from Union MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool name 'search' combined with 'docs' indicates a read-only query operation that retrieves or searches documentation. There is no indication of modifications, execution, deletion, or financial impact. Despite the empty description reducing confidence slightly, the naming convention clearly points to a Read category tool with low severity.
From the tool's definition Tool name 'search_full_docs' indicates a search/query operation over documentation. The description is empty, which limits confidence, but the name strongly suggests retrieval without side effects.
Documented attack patterns abuse exactly the kind of access search_full_docs gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Union MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for search_full_docs:
{
"version": "1",
"default": "deny",
"tools": {
"search_full_docs": {}
}
}search_full_docs is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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search_full_docs. It is categorised as a Read tool in the Union MCP MCP Server, which means it retrieves data without modifying state.
Register the Union MCP server in PolicyLayer and add a rule for search_full_docs: 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 Union MCP. Nothing to install.
search_full_docs 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 search_full_docs 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 search_full_docs. 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.
search_full_docs is provided by the Union MCP server (unionai-oss/union-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Union MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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14 Union MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.