AI agents call list_json_schemas to retrieve information from Todos without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only query of available JSON schemas. It retrieves structural information about tasks, projects, plans, runs, evidence, handoffs, bundles, and MCP responses with no capability to modify, delete, or execute operations. The action is non-destructive and informational in nature, fitting the 'Read' category for data retrieval tools.
From the tool's definition Tool name 'list_json_schemas' combined with description 'List versioned JSON schemas' indicates a retrieval operation that queries and returns schema metadata without modification or side effects.
Attacks that exploit this kind of access
List versioned JSON schemas for tasks, projects, plans, runs, evidence, handoffs, bundles, and MCP responses. It is categorised as a Read tool in the Todos MCP Server, which means it retrieves data without modifying state.
Register the Todos MCP server in PolicyLayer and add a rule for list_json_schemas: 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 Todos. Nothing to install.
list_json_schemas 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_json_schemas 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_json_schemas. 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_json_schemas is provided by the Todos MCP server (@hasna/todos). 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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