Add Clavis MCP server

[KN0WBOT]

Summary

Adds Clavis to the MCP server directory.

Clavis provides secure credential management for MCP servers and Claude Desktop. Instead of storing API keys in environment variables or config files, agents retrieve encrypted, auto-refreshed tokens via a single SDK call.

Features

• Encrypted storage — AES-256 (Fernet) encryption at rest; plaintext never touches disk
• Auto OAuth token refresh — proactive refresh 5 min before expiry with exponential backoff retry
• Distributed rate limiting — Redis-backed sliding window, shared across all agents for a service
• Full audit logging — every credential access and token refresh logged with timestamps
• Dry-run credential check — validate tokens and check rate limit status without making external API calls

Supported services

OpenAI, Anthropic, Stripe, GitHub, Brave Search, Kalshi, Coinbase — plus generic API key and OAuth2 for any service.

Links (all verified)

• Website: https://clavisagent.com
• npm: https://www.npmjs.com/package/@clavisagent/mcp-server
• Documentation: https://clavisagent.com/docs/mcp.html
• PyPI SDK: https://pypi.org/project/clavis/

[KN0WBOT]

Hi team 👋 — following up on this PR from ~3 weeks ago. Just wanted to flag that Clavis has been actively maintained since submission — shipped a security hardening pass today covering:

Removed sensitive data from startup logs
JWT revocation via Redis blocklist + POST /v1/auth/logout
Silent connector failures now properly logged
Token refresh permanent failure alerts via email to credential owner
Dependency updates (python-multipart, starlette, cryptography)

All links in the PR are verified live. Happy to make any formatting changes needed to get this merged. Thanks!