Single tool 'post_tweet' has a clear action verb and basic schema with Zod validation. However, the description is minimal (47 chars), lacks context on when to use it vs alternatives, and does not explain the write-side effects or prerequisites (Twitter API credentials). Parameter descriptions are present but terse. No output schema is documented, the response structure is inferred from code. Error handling returns raw API errors without recovery guidance. The tool lacks idempotency hints and does not address the destructive nature of posting (irreversible action).

• Expand tool description to 100-200 chars: 'Post a new tweet or reply to X (Twitter). Tweets are permanent and cannot be deleted via this tool. Requires valid Twitter API credentials. Use this to share updates, reply to conversations, or engage with followers.'
• Document the output schema explicitly: 'Returns {content: [{type: string, text: string}], isError?: boolean}. On success, text contains 'Tweet posted. ID: <tweet_id>'. On error, isError=true and text contains the error message.'
• Enhance error handling: catch specific Twitter API errors (auth failure, rate limit, invalid tweet length) and return actionable messages like 'Tweet exceeds 280 characters. Reduce text length and retry.' or 'Rate limited. Wait 15 minutes before posting again.'
• Add a 'dry_run' parameter (boolean, optional, default false) to preview the tweet without posting. This prevents accidental posts and lets agents validate content before committing.
• Clarify 'replyToId' parameter: 'Optional tweet ID to reply to (numeric string, e.g. "1234567890"). If provided, the tweet will be posted as a reply. If invalid or deleted, the API will return an error.'

Inferred effective spec: <=2025-11-25.

• Relies on Stateful initialize / Mcp-Session-Id (removed; protocol is stateless) - make each request self-contained