This server demonstrates solid definition quality with consistent naming conventions, reasonable descriptions, and proper schema definitions across all 15 tools. All tools follow a clear verb_noun or verb_resource pattern (companies_list, filings_retrieve, etc.). Descriptions are present and contextually adequate (averaging ~80-120 chars), though some lack the depth recommended for LLM optimization. All tools have documented input parameters with types and descriptions. However, there are notable gaps: output schemas are not explicitly documented in the provided source, no tool annotations (readOnlyHint/destructiveHint) are present despite all being READ_ONLY operations, parameter constraints are minimal (no enums where applicable), and error handling patterns are not visible in the tool definitions. The server uses fastmcp framework with HTTP transport and appears well-structured for production use, but lacks some of the polish expected in A-grade tool definitions.

• Document output schemas for all tools. Example: companies_list should return {companies: [{id, name, country_code, ...}], total_count: number, has_more: boolean}. This enables LLMs to extract data and plan follow-up calls.
• Add tool annotations to all tools. Use readOnlyHint=true for all 15 tools to signal idempotency and safe retry behavior to LLMs.
• Convert free-form string parameters to enums where values are known. For companies_financials_retrieve, make statement_type and fiscal_period enums instead of strings.
• Document pagination constraints explicitly. State max page_size, whether count/total is returned, and how to detect end-of-results (has_more flag, empty array, or null next_cursor).
• Add numeric constraints to all integer/number parameters. E.g., page: {type: integer, minimum: 1}, page_size: {type: integer, minimum: 1, maximum: 100}.
• Enhance parameter descriptions with actionable format details. E.g., 'Search term for company name (2-255 characters, alphanumeric + spaces)' instead of just 'Search term for company name'.
• Add error handling documentation to tool descriptions. E.g., 'Returns 404 if company_id not found, try companies_list to search by name first.'
• Consider adding dependency hints to tool descriptions. E.g., companies_list states 'Call this first if you only have a company name but need the ID for other tools.'
• Document the cap for filings_markdown_retrieve limit parameter (150k chars mentioned) more prominently in description.
• Validate and reject oversized page_size or offset values at request time, returning clear error: 'page_size must be 1-100, got {value}' rather than silently truncating.

Inferred effective spec: 2025-06-18+.

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