Three tools with mixed quality. 'add' has a trivial description (8 chars, well below 20-char minimum) and lacks parameter descriptions entirely. 'userInfoOctokit' has no description and empty schema. 'generateImage' has a reasonable description (127 chars) and well-documented parameters with constraints (min/max, enum-like descriptions). Parameter descriptions are present only for generateImage. No output schemas documented for any tool. Error handling is absent across all tools.

• Add a substantive description to 'add' (currently 8 chars). Example: 'Add two numbers and return the sum. Useful for arithmetic operations in agent workflows.' (80+ chars).
• Add descriptions to 'a' and 'b' parameters in 'add'. Example: 'a': 'The first number to add (numeric value)', 'b': 'The second number to add (numeric value)'.
• Add a description to 'userInfoOctokit'. Example: 'Fetch the authenticated GitHub user's profile information (login, name, email, public repos, etc.) using the OAuth token from the current session.'
• Document output schemas for all tools. For 'generateImage', specify: returns {type: 'image', data: base64_string, mimeType: 'image/jpeg'}. For 'userInfoOctokit', document the Octokit user object structure.
• Add error handling with recovery guidance. Example: 'If GitHub API returns 401, the OAuth token may have expired, re-authenticate. If image generation times out after 30s, retry with fewer steps (4-6 instead of 8).'