AI agents call adr_history to retrieve information from Mcp Adr without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The adr_history tool retrieves and queries existing Architecture Decision Records based on search criteria and returns them in chronological order. This is a read-only operation that has no side effects on the data. It does not create, modify, delete, or execute any operations - it only fetches and presents information in a specific format (timeline).
From the tool's definition Tool description states 'Find ADRs matching a query, returned as a timeline sorted by date' - this is a search/retrieval operation with no modification of data.
Attacks that exploit this kind of access
Find ADRs matching a query, returned as a timeline sorted by date. It is categorised as a Read tool in the Mcp Adr MCP Server, which means it retrieves data without modifying state.
Register the Mcp Adr MCP server in PolicyLayer and add a rule for adr_history: 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 Mcp Adr. Nothing to install.
adr_history 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 adr_history 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 adr_history. 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.
adr_history is provided by the Mcp Adr MCP server (mauriziomocci/mcp-adr). 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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