AI agents call status_favourited_by to retrieve information from Mastodon without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves existing data (which accounts favourited a status) without modifying, deleting, or executing any operations. It is a pure read operation that accesses publicly available engagement information on the Mastodon platform. No side effects or state changes occur.
From the tool's definition Tool name 'status_favourited_by' and description 'Get accounts that favourited a status' indicate retrieval of public metadata about engagements on a status. The verb 'Get' is characteristic of read operations.
Attacks that exploit this kind of access
Get accounts that favourited a status. It is categorised as a Read tool in the Mastodon MCP Server, which means it retrieves data without modifying state.
Register the Mastodon MCP server in PolicyLayer and add a rule for status_favourited_by: 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 Mastodon. Nothing to install.
status_favourited_by 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 status_favourited_by 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 status_favourited_by. 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.
status_favourited_by is provided by the Mastodon MCP server (vitexsoftware/mastodon-mcp-server). 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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