Perform an advanced search using custom CQL query syntax. Examples: dc.creator all
AI agents call advanced_search to retrieve information from Gallica/BnF MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries the Gallica digital library and returns search results without any side effects. CQL (Contextual Query Language) is a standard query syntax for searching structured data, and the tool is limited to searching metadata fields like dc.creator (Dublin Core creator field). No data is modified, deleted, or executed; only information is retrieved.
From the tool's definition Tool performs search operations using CQL query syntax on a digital library. The description states it 'Perform[s] an advanced search' with no mention of data modification, deletion, or execution of arbitrary code.
Attacks that exploit this kind of access
Perform an advanced search using custom CQL query syntax. Examples: dc.creator all. It is categorised as a Read tool in the Gallica/BnF MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Gallica/BnF MCP Server MCP server in PolicyLayer and add a rule for advanced_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 Gallica/BnF MCP Server. Nothing to install.
advanced_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 advanced_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 advanced_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.
advanced_search is provided by the Gallica/BnF MCP Server MCP server (ukicar/sweet-bnf). 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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