MCP Inspector exposes 2 tools for introspection and tool invocation. Both tools have descriptions and basic input schemas, but critical gaps limit production readiness. listTools lacks required parameters entirely (only optional _meta). callTool has required parameters (name, arguments) but descriptions are minimal (under 50 chars each). Neither tool documents output schemas, error handling, or recovery guidance. Parameter descriptions do not explain constraints, formats, or valid ranges. No tool annotations (readOnlyHint/destructiveHint) despite callTool being destructive. Schemas present but incomplete, missing type constraints, enums, and detailed field documentation. Error handling is absent; no guidance on what to do if a tool call fails or if a tool name is invalid.

• Add destructiveHint: true to callTool schema to signal that it can modify remote state. Include a warning in the description: 'This tool invokes arbitrary tools on the connected MCP server. Verify tool names and arguments before calling.'
• Document output schemas for both tools. listTools should return {tools: [{name: string, description: string, inputSchema: object}], total: number}. callTool should return {result: object, success: boolean, error?: string}.
• Expand parameter descriptions to 100-150 characters. For 'arguments', explain: 'Object containing tool-specific parameters. Structure depends on the target tool's input schema. Pass as key-value pairs matching the tool's documented parameters.'
• Add error handling guidance: 'If the tool name is not found, the response will include an error field. Call listTools first to verify available tool names. If arguments are invalid, the error will describe the constraint violation.'
• Add type constraints to the 'arguments' parameter schema: {type: 'object', additionalProperties: true, description: '...'}. Consider documenting common argument patterns (string, number, boolean, array) in the tool description.