32 tools with consistent naming (verb_noun pattern) and basic descriptions, but critical gaps in schema completeness and parameter documentation. All tools have descriptions (10-50 chars, below the 50-200 char baseline for LLM optimization). Input schemas visible but severely incomplete: most tools lack detailed parameter type info, constraints, and enums. No output schemas documented. Error handling absent. Composition is sound (single responsibility per tool), but parameter descriptions are minimal, forcing LLMs to infer intent. Example: create_invoice has 'items' param described only as 'Line items for the invoice' with no schema for array element structure. update_* and delete_* tools lack parameter documentation beyond IDs. No pagination support on list_* tools despite Wave API likely returning large result sets.

• Expand all tool descriptions from 10-50 chars to 50-200 chars. Include WHAT the tool does, WHEN to use it, and any prerequisites. Example: 'List invoices for a Wave business. Optionally filter by status (DRAFT, SENT, PAID, OVERDUE, CANCELLED) or customer. Returns paginated results with invoice ID, number, amount, and status, use to find invoices before updating or deleting.'
• Add pagination to all list_* tools: add 'limit' (1-100, default 20) and 'offset' (default 0) parameters. Document that results are capped at limit and include a 'total_count' field in responses so agents know when to paginate.
• Document output schemas for all tools. For get_invoice, specify: returns {id, number, amount, status, customer_id, due_date, items: [{description, quantity, price}]}. This enables agents to chain calls (e.g., extract customer_id and pass to get_customer).
• For update_* tools, document which fields are updatable. Example: 'Update an existing invoice. Updatable fields: dueDate, status (DRAFT, SENT, CANCELLED). Provide only the fields to change; omitted fields are not modified.'
• Add error handling guidance to all tools. Example: 'Returns 404 if invoice not found, try list_invoices to verify the ID. Returns 401 if not authenticated, check Wave credentials. Returns 422 if status transition invalid, consult Wave docs for allowed transitions.'

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

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