18 tools with consistent naming (verb_noun pattern) and reasonable descriptions (avg ~120 chars). All tools have input schemas with typed parameters. However, critical gaps: (1) descriptions lack actionable context for LLM selection, most are 1-2 sentences without WHEN/WHY guidance; (2) no output schemas documented, LLMs cannot plan downstream calls; (3) enum constraints missing for status/entity/metrics params (free-form strings invite hallucination); (4) error handling returns raw API payloads without recovery guidance; (5) write tools lack confirmation/dry-run patterns despite destructive capability. Naming is strong (auth_check, list_campaigns, set_campaign_status), but parameter descriptions are sparse (e.g., 'campaign payload' vs 'name (string, 1-100 chars), objective (enum: awareness|traffic|conversions), budget_limit_day (int, 100-1000000 RUB)').

• Document output schemas for all tools. E.g., list_campaigns returns {ok: bool, items: [{campaign_id: int, name: string, status: enum, budget_limit: int, ...}], total: int}. Include all fields LLMs need to chain downstream calls.
• Convert status, entity, and metrics parameters to enums. E.g., status: enum('active'|'blocked'|'deleted'), entity: enum('campaigns'|'ad_groups'|'banners'|'users'), metrics: enum('base'|'video'|'uniques'|'all'). Prevents hallucinated values.
• Expand descriptions to 80-150 chars with WHEN/WHY context. E.g., 'Get a single campaign by ID. Use when you have a campaign_id from list_campaigns(); use list_campaigns() to search by name or status.' This guides LLM selection.
• Add confirmation step for destructive writes. E.g., set_campaign_status('deleted') should return {ok: false, requires_confirmation: true, message: 'This will permanently delete campaign 123. Call confirm_delete_campaign(campaign_id=123) to proceed.'} Pattern: confirmation-request.
• Enhance error responses with recovery guidance. E.g., 'Invalid campaign_id: 999 not found. Available campaigns: [123 (My Campaign), 456 (Q4 Promo)]. Use list_campaigns() to search by name.' Pattern: recovery-guide.