list_completed_tasks
AI agents call list_completed_tasks to retrieve information from Todoist MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries/retrieves historical task data (completed tasks) with no ability to modify, delete, or execute operations. It is purely a read operation with minimal blast radius if misused—an agent could only retrieve information already available to the user. Low severity and high confidence due to clear naming convention and server context, despite empty tool description.
From the tool's definition Tool name is 'list_completed_tasks' which retrieves completed tasks; the server description states it 'enables AI agents to create and list tasks' indicating listing is a read-only operation.
Attacks that exploit this kind of access
list_completed_tasks. It is categorised as a Read tool in the Todoist MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Todoist MCP Server MCP server in PolicyLayer and add a rule for list_completed_tasks: 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 Todoist MCP Server. Nothing to install.
list_completed_tasks 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_completed_tasks 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_completed_tasks. 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_completed_tasks is provided by the Todoist MCP Server MCP server (mehularora8/todoist-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.
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