This server aggregates three distinct finance/messaging APIs (DART, Toss, Telegram) into a single MCP process. Tool naming is generally verb-first and clear (search_companies, get_financial_statements, place_order, get_messages). However, critical gaps undermine production readiness: (1) Most parameter descriptions are minimal or missing type constraints (e.g., 'Account sequence number' lacks format/range guidance). (2) Output schemas are not documented, LLMs cannot predict response structure for chaining. (3) Error handling is absent from visible code; no recovery guidance. (4) Several tools accept free-form strings where enums would prevent hallucination (report_type, disclosure_type, file_type have valid sets but are not enforced as enums in schema). (5) Sensitive operations (place_order, cancel_order, download_file) lack confirmation/dry-run patterns. (6) Parameter naming inconsistencies: some tools use 'chat' (Telegram), others 'corp_code' (DART), 'account_seq' (Toss), no unified pattern. Average tool description length ~80 chars (below 194-char baseline); many lack actionable context for LLM selection.

• Document output schemas for all tools. Include field names, types, and whether results are paginated. Example: 'Returns {companies: [{code: string, name: string, sector: string}], total: int, next_cursor?: string}'.
• Convert free-form string parameters to enums where valid sets exist. In JSON Schema, use 'enum' constraint: report_type: {type: 'string', enum: ['annual', 'half', 'q1', 'q3', 'all']}.
• Add format/range constraints to parameter descriptions. E.g., 'Account sequence number (8-12 digits, numeric only)' or 'Limit (1-200, default 100)'.
• Implement confirmation pattern for destructive tools. Add optional 'dry_run' parameter or require explicit 'confirm: true' for place_order, cancel_order, download_file.
• Add error handling with recovery guidance. Return structured errors: {error: 'not_found', message: 'Company code not found', suggestion: 'Try search_companies() with partial name'}.