needle_search
AI agents call needle_search to retrieve information from Needle MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The 'needle_search' tool appears designed to query and retrieve information from stored documents without modifying or deleting them. Sibling tools like 'needle_list_collections' and 'needle_get_collection_details' confirm this server's read-oriented architecture. Search operations typically have no side effects unless they trigger unintended execution, but the context suggests simple document retrieval.
From the tool's definition Tool name 'needle_search' and server description stating it 'perform Claude-powered searches using Needle' indicates data retrieval capability.
Attacks that exploit this kind of access
needle_search. It is categorised as a Read tool in the Needle MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Needle MCP Server MCP server in PolicyLayer and add a rule for needle_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 Needle MCP Server. Nothing to install.
needle_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 needle_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 needle_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.
needle_search is provided by the Needle MCP Server MCP server (needle-ai/needle-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.
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