Search NLB catalogue by keyword (BRN/ISBN/Title/Author/Subject).
AI agents call search_titles to retrieve information from NLB Singapore Library MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a straightforward catalogue search function that retrieves bibliographic data without side effects. It matches the 'Read' category as a search/query operation. Severity is low because misuse (e.g., querying for sensitive information) poses minimal risk within a public library catalogue context. High confidence due to clear read-only semantics in the description.
From the tool's definition Tool searches NLB catalogue by keyword (BRN/ISBN/Title/Author/Subject) with no mention of modification, deletion, or execution capabilities. Description explicitly indicates retrieval/query operation only.
Attacks that exploit this kind of access
Search NLB catalogue by keyword (BRN/ISBN/Title/Author/Subject). It is categorised as a Read tool in the NLB Singapore Library MCP Server MCP Server, which means it retrieves data without modifying state.
Register the NLB Singapore Library MCP Server MCP server in PolicyLayer and add a rule for search_titles: 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 NLB Singapore Library MCP Server. Nothing to install.
search_titles 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_titles 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_titles. 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_titles is provided by the NLB Singapore Library MCP Server MCP server (nikhil-grayscale/nlb-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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