Single-pass semantic search against the Mixedbread store bound to a content scope. Call list_integrations first, then pass only the scope and query; raw store identifiers are never accepted.
AI agents call mixedbread_search to retrieve information from Open MCP Knowledgebase without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries a knowledge store and returns search results—a typical Read operation with no side effects. The severity is low because search operations have minimal blast radius; misuse results in information disclosure rather than data loss, financial impact, or system compromise. Confidence is high due to explicit 'search' language and read-only semantics in the description.
From the tool's definition Tool performs "semantic search" with "query" parameter; description explicitly states it retrieves data from a store without creating, modifying, or deleting content.
Attacks that exploit this kind of access
Single-pass semantic search against the Mixedbread store bound to a content scope. Call list_integrations first, then pass only the scope and query; raw store identifiers are never accepted. It is categorised as a Read tool in the Open MCP Knowledgebase MCP Server, which means it retrieves data without modifying state.
Register the Open MCP Knowledgebase MCP server in PolicyLayer and add a rule for mixedbread_search: 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 Open MCP Knowledgebase. Nothing to install.
mixedbread_search 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 mixedbread_search 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 mixedbread_search. 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.
mixedbread_search is provided by the Open MCP Knowledgebase MCP server (no-product/knowledgebase-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
Teams ship this data inside their own products. See what a licence covers →