Extenshi MCP has 21 tools with consistent naming (verb_noun pattern) and reasonable descriptions (avg ~120 chars). However, critical gaps exist: input schemas are not visible in the provided source code excerpt, parameter descriptions are largely absent, and output schemas are undocumented. The tools.ts file shows tool bodies but not explicit schema registration. Error handling is minimal, most tools lack recovery guidance. Security is well-designed (identity-agnostic, no secrets in params), and composition is sound (single responsibility per tool). The server instructions are comprehensive, but tool-level documentation falls short of production standards.

• Add explicit input schemas to all 21 tools. For each parameter, define type (string, number, boolean, enum), constraints (min/max, pattern, length), and a 50 - 100 character description explaining what it controls and valid values. Use Zod or JSON Schema.
• Document output schemas. For each tool, describe the response structure: field names, types, and what each field represents. Include examples of successful responses so LLMs know what to expect.
• Add parameter descriptions to search_extensions, get_risk_by_store_ids, and list_privacy_policy. Explain what store_ids, policy_id, and filter parameters do, their format, and constraints (e.g., 'store_ids: array of 1 - 40 Chrome Web Store extension IDs').
• Enhance error handling in scan_extension and publish_extension. When ScanError or PublishSetupError occurs, return a message like 'Scan failed: [reason]. Try: [recovery step]' instead of a bare error code.
• Document pagination for list_* tools. Add limit and offset/cursor parameters to search_extensions, list_my_projects, list_privacy_policy, and list_extension_templates. Specify default and max limits (e.g., default=20, max=100) and return a total_count or next_cursor in responses.