AI agents call list_attachments to retrieve information from Tbird without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves attachment metadata (filenames) from an existing message. It has no side effects, does not execute code, does not modify data, and does not remove or create anything. It is a pure read operation with minimal blast radius if misused by an agent—at worst, an attacker learns what files are attached to messages the agent can access.
From the tool's definition Tool name 'list_attachments' and description 'List attachment filenames on a message' indicate a retrieval operation that queries metadata about message attachments without modifying, executing, or deleting anything.
Attacks that exploit this kind of access
List attachment filenames on a message. It is categorised as a Read tool in the Tbird MCP Server, which means it retrieves data without modifying state.
Register the Tbird MCP server in PolicyLayer and add a rule for list_attachments: 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 Tbird. Nothing to install.
list_attachments 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 list_attachments 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 list_attachments. 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.
list_attachments is provided by the Tbird MCP server (neil-zielsdorf/tbird-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.
Teams ship this data inside their own products. See what a licence covers →