15 tools with complete schemas and descriptions, but quality is uneven. Tool names follow verb_noun convention (get_, create_, find_) which is good. Descriptions are present but often generic (avg ~80 chars, below the 194-char baseline). Parameters lack depth: no enums for constrained values (e.g., dealstage should be an enum), no format constraints (closedate is 'string' not 'date-time'), no min/max bounds on numeric params (limit, days). Output schemas are not documented, LLMs cannot predict response structure. Error handling is minimal; no recovery guidance. Duplicate-checking logic mentioned in create_contact/create_company descriptions but not formalized. Missing: idempotency hints, permission scopes, rate-limit guidance.

• Document output schemas for all tools. Example: hubspot_create_contact should return {contact_id: string, email: string, firstname: string, lastname: string}. This enables LLMs to chain tools (e.g., create_contact → get_contact with returned ID).
• Convert dealstage parameter to an enum with valid values (appointmentscheduled, qualifiedtobuy, negotiation, closedwon, closedlost, etc.). Add format='date-time' to closedate parameter.
• Add min/max constraints to numeric parameters: limit (1 - 100), days (1 - 365). Document defaults in descriptions: 'Maximum number of contacts to return (default: 10, max: 100)'.
• Expand descriptions to 100 - 200 chars with context on when to use each tool. Example: 'Find a contact by email. Use this when you have an email address but not a contact ID. Returns contact details including ID for use in associations.'
• Add error recovery guidance to create_* tools: 'If creation fails due to duplicate, call find_contact_by_email() to retrieve the existing contact ID and use it for associations.'