Scores an MCP server on agent usability (A–F) and returns the specific defects that cost it points, each with a concrete fix. Grades description quality, schema design, tool naming, token cost and catalog consistency — the properties that determine whether a model picks the right tool and fills valid arguments, which spec-compliance checks do not measure. Returns a grade, per-category scores, finding counts by severity, and a prioritized finding list. Use this before depending on a third-party server, or after changing your own catalog.

Returns the full rationale for one grading rule: what it detects, why it degrades agent behaviour, and how to fix it. Use this after grade_mcp_server reports a finding you want to understand or dispute, rather than guessing what a rule ID means.

Lists every rule mcpgrade applies, with its identifier, severity and one-line summary. Use this to see what is checked before grading, or to find the identifier of a rule to pass to explain_rule.