Multi-field semantic search (custom field selection)
AI agents call search_multi_field_semantic to retrieve information from ContextForge MCP Gateway without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a search tool that retrieves data based on semantic matching across multiple fields. It performs read-only queries without creating, modifying, deleting, or executing operations. The custom field selection allows flexible querying but does not alter underlying data. The blast radius of misuse is minimal—an agent could retrieve unintended data, but cannot modify systems or trigger external effects.
From the tool's definition Tool name 'search_multi_field_semantic' and description 'Multi-field semantic search (custom field selection)' indicate a query/retrieval operation with no mutation, deletion, or execution of code.
Attacks that exploit this kind of access
Multi-field semantic search (custom field selection). It is categorised as a Read tool in the ContextForge MCP Gateway MCP Server, which means it retrieves data without modifying state.
Register the ContextForge MCP Gateway MCP server in PolicyLayer and add a rule for search_multi_field_semantic: 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 ContextForge MCP Gateway. Nothing to install.
search_multi_field_semantic 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_multi_field_semantic 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_multi_field_semantic. 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_multi_field_semantic is provided by the ContextForge MCP Gateway MCP server (jrmatherly/mcp-context-forge). 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.
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