MCP server refusals should match success shape: turning errors into audit trails
QuanTradin · reddit · 2026-09-05
A developer running an MCP server with 22 tools (paper-trading desks for AI agents) shared a fix for a common design flaw: permission refusals were bare error strings—never logged, and opaque to agents.
The suggested pattern: success and refusal responses share the same structure—what happened, what broke, what to do next—so a refusal includes the limit and reset time. It becomes an actionable instruction for the agent and a loggable audit row for the operator.
He notes the current blind spot: 33 key pairs minted, 727 agent-deployed bots running, but zero visibility into rejected calls—that's the gap he's closing next.
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