IncomeOS MCP has 4 tools with clear verb-noun naming (get_*, log_*) and reasonable descriptions (avg 120 chars). However, critical gaps undermine production readiness: 3 of 4 tools have empty input schemas ({}), violating the requirement that every parameter needs a description. The one tool with parameters (get_month, log_monthly_income) has proper Zod schemas with regex patterns and descriptions. Error handling is minimal, no recovery guidance, no categorization of retryable vs fatal errors. Output is unstructured text rather than typed JSON objects, forcing LLMs to parse free-form strings. No pagination, no per-item success/failure reporting. Security: credentials injected via env vars (correct), but no audit logging or permission gates documented.

• Add explicit input schemas to get_income_summary and get_sources. Even if they take no parameters, declare {} with a comment or add optional filters (e.g., limit, offset) to enable pagination.
• Return structured JSON objects instead of plain text. E.g., get_income_summary should return {summary: {avgPerDay, thisMonth, thisYear, allTime}, topSources: [{name, emoji, monthly, yearly}], goals: [{name, current, target, percent}]}.
• Add pagination to get_sources and get_month: accept limit (default 20, max 100) and offset parameters. Return total_count and next_offset to enable multi-page queries.
• Enhance error messages with recovery guidance. E.g., 'Source "xyz" not found. Available sources: [list]. Try log_monthly_income with one of these names.'
• Document output schemas in tool descriptions. E.g., 'Returns a summary object with fields: avgPerDay (USD string), thisMonth (USD string), topSources (array of {name, emoji, amount}).' This helps LLMs plan downstream calls.