List branch codes and names (C005 Library Location). Optional substring filter via
AI agents call list_branches 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 tool retrieves library branch metadata (codes and names) without side effects. It fits the Read category definition: 'retrieves or queries data; no side effects (search, list, get, fetch).' The word 'List' and the mention of filtering static reference data (branch codes/names) confirm it only queries existing information.
From the tool's definition Tool lists branch codes and names with optional substring filter. No modification, deletion, or execution involved. Description indicates read-only query of static library branch information.
Attacks that exploit this kind of access
List branch codes and names (C005 Library Location). Optional substring filter via. 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 list_branches: 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.
list_branches 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 list_branches 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 list_branches. 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.
list_branches 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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