MCP-Based Feedback Submission, Let LLMs Report Missing Capabilities

Description: Enable LLM agents connected via an MCP (Model Context Protocol) server to submit feedback directly into Sleekplan — the same way a human user would. This includes reports about missing tools, refused actions, out-of-scope requests, or capability gaps the LLM encounters during a session. Problem: When an LLM uses an MCP server (either customer-provided or Sleekplan-provided) and hits a limitation — a missing tool, a capability it can't fulfill, or a task it shouldn't perform — that signal is currently lost. There is no structured way for the model to surface these gaps back to the product team as feedback. Benefit: Product teams gain a new, automated feedback channel: real-time capability gap reports straight from LLM agents in the field. Missing MCP tools or unsupported use cases become actionable feedback items, not silent failures. Sleekplan becomes a natural destination for AI-native feedback loops, making the feedback board richer and more proactive. Works symmetrically for both Sleekplan-hosted MCP servers and customer-operated ones.