This server has 3 tools with minimal but present descriptions and basic schemas. However, the naming is inconsistent (mixing verbs like 'echo', 'fetch', 'fetch'), parameter descriptions are sparse or missing, and output schemas are not documented. Tool names lack clarity about what distinguishes similar tools (echo_message vs fetch_cat_fact vs fetch_image_test). No tool annotations, limited error handling guidance, and no evidence of idempotency or composition support. The server follows a basic template structure but falls well short of production-grade tool definition quality. Most tools are simple read-only operations with trivial purposes (echo, cat facts, image test), which limits their real-world utility and sophistication.

• Rename tools to use clear verb_noun format that immediately signals purpose. Consider 'describe_cat_behavior', 'analyze_image_content', and 'echo_user_message' to clarify intent.
• Document the output schema for each tool. For fetch_cat_fact, specify: returns {fact: string, source_url?: string}. For fetch_image_test, specify: returns {width: number, height: number, format: string, analysis?: string}. For echo_message, specify: returns {echoed_message: string, length: number}.
• Expand tool descriptions to 100 - 200 characters, answering WHAT (what does the tool do?), WHEN (when should an agent use it?), and OUTPUT (what structure is returned?). Example: 'fetch_cat_fact: Retrieves a random fact about cat behavior from the Cat API. Use when the agent needs engaging trivia to present to the user. Returns a JSON object with the fact text and source URL.'
• Add descriptions to all parameters. For fetch_image_test's URL parameter: 'The URL of an image file to fetch and analyze. Must be a publicly accessible HTTP(S) URL pointing to a JPG, PNG, or WebP file. Examples: https://example.com/photo.jpg'.
• Implement tool annotations. Mark all three tools with readOnlyHint: true and idempotentHint: true in the tool registration, so agents know they are safe to retry.
• Add error handling guidance in tool descriptions. Example for fetch_image_test: 'If the URL is invalid or the image cannot be fetched, the tool returns an error with a message like "Invalid URL: must be HTTP(S)" or "Image fetch failed: server returned 404." Suggest the user provide a different URL or verify the link is public.'

Inferred effective spec: <=2025-11-25.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry