query_at
AI agents call query_at to retrieve information from Chronos MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool appears designed to retrieve historical data from the knowledge graph at specified time points. Even though the description is missing, the naming convention 'query_at' combined with the server's stated purpose of time-travel queries and the pattern of read-only sibling tools strongly suggests a retrieval operation with no side effects.
From the tool's definition Tool name 'query_at' suggests querying data at a specific point in time, consistent with the server's capability for 'time-travel queries to reconstruct past information'.
Attacks that exploit this kind of access
query_at. It is categorised as a Read tool in the Chronos MCP MCP Server, which means it retrieves data without modifying state.
Register the Chronos MCP server in PolicyLayer and add a rule for query_at: 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 Chronos MCP. Nothing to install.
query_at 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 query_at 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 query_at. 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.
query_at is provided by the Chronos MCP server (synaptikal/chronosmcp). 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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