Refine previous search results with an additional query. Useful for progressive search refinement: first search broadly (e.g.,
AI agents call search_within_results to retrieve information from TDZ C64 Knowledge without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and filters existing search results without modifying, deleting, or executing any operations. It performs a secondary query against cached or in-memory search results, which is a non-destructive read operation with no side effects or capability to alter data. The low severity reflects minimal blast radius—a misused search refinement cannot cause harm beyond returning incorrect information.
From the tool's definition Tool name is 'search_within_results' and description explicitly states it 'Refine previous search results with an additional query' - a read-only refinement operation on already-fetched search results.
Attacks that exploit this kind of access
Refine previous search results with an additional query. Useful for progressive search refinement: first search broadly (e.g.,. It is categorised as a Read tool in the TDZ C64 Knowledge MCP Server, which means it retrieves data without modifying state.
Register the TDZ C64 Knowledge MCP server in PolicyLayer and add a rule for search_within_results: 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 TDZ C64 Knowledge. Nothing to install.
search_within_results 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_within_results 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_within_results. 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_within_results is provided by the TDZ C64 Knowledge MCP server (michaeltroelsen/tdz-c64-knowledge). 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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