matrix_joined_rooms
List rooms the authenticated user is in, with a name hint for each.
This record as markdown: /tools/kh0pper-crow/matrix-joined-rooms.md
What matrix_joined_rooms does on Crow
AI agents call matrix_joined_rooms to retrieve information from Crow without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why matrix_joined_rooms is rated Low
This tool performs a simple list/query operation on the authenticated user's Matrix rooms. It has no side effects, does not create, modify, or delete data, and does not execute code or trigger external operations. It is a straightforward data retrieval function, placing it squarely in the Read category.
From the tool's definition Tool name 'matrix_joined_rooms' and description 'List rooms the authenticated user is in, with a name hint for each' indicate a read-only query operation that retrieves existing data without modification.
Attacks that exploit this kind of access
The rule that runs matrix_joined_rooms safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Crow, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For matrix_joined_rooms, this is the rule to start with:
matrix_joined_rooms is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Crow, apply this rule, and every matrix_joined_rooms call is checked against it from then on.
Questions about matrix_joined_rooms
List rooms the authenticated user is in, with a name hint for each. It is categorised as a Read tool in the Crow MCP Server, which means it retrieves data without modifying state.
Register the Crow MCP server in PolicyLayer and add a rule for matrix_joined_rooms: 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 Crow. Nothing to install.
matrix_joined_rooms 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 matrix_joined_rooms 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 matrix_joined_rooms. 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.
matrix_joined_rooms is provided by the Crow MCP server (kh0pper/crow). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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