AI agents call explain_error to retrieve information from Molmcp without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool name indicates it explains or retrieves information about errors rather than executing code, modifying data, or causing side effects. Contextually, it fits the Read category pattern of other introspection and documentation tools on this codebase discovery server. Without an explicit description, confidence is moderate, but the name and sibling tools strongly indicate a query/retrieval operation.
From the tool's definition Tool name 'explain_error' and position among sibling tools (explain_command, get_command_doc, get_doc_index, get_howto, etc.) suggests it retrieves or analyzes error information without modifying state. Description is empty, reducing confidence.
Attacks that exploit this kind of access
explain_error. It is categorised as a Read tool in the Molmcp MCP Server, which means it retrieves data without modifying state.
Register the Mol MCP server in PolicyLayer and add a rule for explain_error: 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 Molmcp. Nothing to install.
explain_error 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 explain_error 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 explain_error. 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.
explain_error is provided by the Mol MCP server (molcrafts/molmcp). 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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