List all personal Capacities spaces. Returns space IDs and names.
AI agents call capacities_list_spaces to retrieve information from Capacities MCP Worker without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves information about available spaces in a Capacities knowledge base. It performs a query operation that returns existing data (space IDs and names) without creating, modifying, deleting, or executing any operations. The blast radius of misuse is minimal—an attacker could learn the structure of a user's knowledge base but cannot alter or delete data, execute code, or cause financial harm.
From the tool's definition Tool description states it 'List all personal Capacities spaces' and 'Returns space IDs and names.' The verb 'List' and the read-only nature of returning metadata without modification indicates data retrieval with no side effects.
Attacks that exploit this kind of access
List all personal Capacities spaces. Returns space IDs and names. It is categorised as a Read tool in the Capacities MCP Worker MCP Server, which means it retrieves data without modifying state.
Register the Capacities MCP Worker MCP server in PolicyLayer and add a rule for capacities_list_spaces: 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 Capacities MCP Worker. Nothing to install.
capacities_list_spaces 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 capacities_list_spaces 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 capacities_list_spaces. 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.
capacities_list_spaces is provided by the Capacities MCP Worker MCP server (tieubao/capacities-mcp-worker). 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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