AI agents call chronica_search to retrieve information from Chronica without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool name and context indicate a search/query operation over a persistent memory store. While the description is empty, the naming convention and sibling tools provide strong evidence this is a Read operation that retrieves data without side effects.
From the tool's definition Tool name 'chronica_search' indicates a search operation. Sibling tools include 'chronica_get_last_seen', 'chronica_get_thread_info', and 'chronica_list_threads', which are all Read operations that query persistent memory without modifying it.
Attacks that exploit this kind of access
chronica_search. It is categorised as a Read tool in the Chronica MCP Server, which means it retrieves data without modifying state.
Register the Chronica MCP server in PolicyLayer and add a rule for chronica_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 Chronica. Nothing to install.
chronica_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 chronica_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 chronica_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.
chronica_search is provided by the Chronica MCP server (nic9dev/chronica). 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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