The server implements a single tool 'view_image' with a clear action verb, comprehensive description, and structured input schema. The tool definition is explicit and visible in ViewImageMcpServer.ts with Zod-based validation. Description is detailed (247 chars) and appropriately instructs LLM behavior. Input schema defines both filePath and base64Data with optional flags and descriptions. However, output schema is not formally documented in the tool definition itself, callers must infer structure from code comments and type interfaces. Error handling is present but generic. The tool is well-named and follows verb_noun pattern, though the assertive tone in the description ('MUST use this tool', 'Do not attempt') is somewhat aggressive for a read-only utility.

• Add an explicit outputSchema to the tool registration defining the multipart response structure: {type: 'object', properties: {content: {type: 'array', items: [...]}}, required: ['content']}.
• Enhance error messages with recovery hints. Example: 'Both filePath and base64Data are missing. Provide one parameter: either an absolute file path (e.g., "/home/user/image.png") or a base64 data URI (e.g., "data:image/png;base64,...").'
• Document resource limits in the tool description. Example: 'Supports images up to 50MB. PNG, JPEG, WebP, GIF formats. Returns PNG-converted output with dimensions metadata.'
• Add tool annotation with readOnlyHint: true when registering the tool to signal to agents that this tool does not modify state.
• Consider softening the language in the description. Replace 'MUST use this tool' and 'Do not attempt' with 'Use this tool to view images' and 'Viewing images through this tool ensures accurate analysis.' This reduces assertiveness while maintaining clarity.