AI agents call show_decay_chart to retrieve information from Ogham without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and presents historical data about memory decay patterns. It has no side effects, does not create or modify data, does not execute code or commands, and does not delete information. It is purely informational/analytical.
From the tool's definition show_decay_chart displays a line chart of historical memory importance trends; it retrieves and visualizes data without modifying, deleting, or executing operations. The description explicitly states it 'shows' (displays) trends over the last 30 days.
Attacks that exploit this kind of access
Line chart showing memory importance trends over the last 30 days. It is categorised as a Read tool in the Ogham MCP Server, which means it retrieves data without modifying state.
Register the Ogham MCP server in PolicyLayer and add a rule for show_decay_chart: 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 Ogham. Nothing to install.
show_decay_chart 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 show_decay_chart 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 show_decay_chart. 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.
show_decay_chart is provided by the Ogham MCP server (ogham-mcp/ogham-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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