AI agents call cairntir_timeline to retrieve information from Cairntir without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves historical information from the memory system in chronological order. It reads and presents existing data without creating, modifying, deleting, or executing external operations. This is a straightforward data retrieval function typical of a memory/knowledge base lookup, making it a Read-category tool with low risk.
From the tool's definition Tool provides a 'chronological view' of stored items ('drawers in a wing') mentioning an entity—a retrieval and query operation with no modification or deletion capability described.
Attacks that exploit this kind of access
Chronological view of drawers in a wing mentioning an entity. It is categorised as a Read tool in the Cairntir MCP Server, which means it retrieves data without modifying state.
Register the Cairntir MCP server in PolicyLayer and add a rule for cairntir_timeline: 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 Cairntir. Nothing to install.
cairntir_timeline 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 cairntir_timeline 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 cairntir_timeline. 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.
cairntir_timeline is provided by the Cairntir MCP server (pnmcguire480/cairntir). 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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