This server exposes API credentials (_apiKey, _secretKey) as required tool parameters, violating critical security patterns. Tool descriptions are present but generic (avg 95 chars, below 194-char baseline). Parameter descriptions lack format constraints, enums, and validation guidance. No output schemas documented. Error handling is minimal, ampFetch throws raw API errors without recovery guidance. Tools are well-named with action verbs (amp_get_*, amp_user_search), but parameter naming is inconsistent (event_type vs m vs re). No pagination documented for amp_get_user_activity despite offset/limit params. Overall: functional but unsafe and incomplete.

• Move _apiKey and _secretKey to server-side environment variables or a vault. Inject credentials at runtime, never expose as parameters. Update tool descriptions to note 'Credentials configured server-side.'
• Document output schemas for all tools. Example for amp_get_events: 'Returns {data: [{event: string, count: number, ...}], series: [...]}'. Include field types and meanings.
• Convert free-form string parameters to enums: 'm' → enum ['active', 'new', 'returning']; 're' → enum ['rolling', 'bracket']. Add format constraint to date params: 'YYYYMMDD format, e.g. 20240115'.
• Enhance error handling: catch API errors and return structured responses like {error: 'auth_failed', message: 'Invalid API key. Verify _apiKey and _secretKey are correct.', retryable: true}. Guide LLM on next steps.
• Standardize parameter naming: rename 'm' → 'metric', 're' → 'retention_type', 'user' → 'user_query'. Use consistent _id suffix for IDs (amplitude_id is correct; keep it).