Best Claude Code mcp servers for api development on Rag (July 2026)

Self-improving tool discovery for AI agents. Searches registries, installs MCP servers as subprocesses, and persists tool knowledge across sessions — no restarts needed.

MCP server that drafts client proposals in your own voice. Save 2-3 of your winning proposals, paste a new brief, and Claude generates a ready-to-send draft. No API key, no cloud — local storage only. `npx -y github:jabbawocky/proposalcraft`

Unified MCP server for email across Gmail (REST API), Outlook (Microsoft Graph), iCloud, and generic IMAP/SMTP. 24 tools for search, send, organize, and batch-manage emails with built-in OAuth2 and encrypted credential storage.

Firebase services including Auth, Firestore and Storage.

interact with Keboola Connection Data Platform. This server provides tools for listing and accessing data from Keboola Storage API.

Narrative & signal intelligence for AI agents (crypto/AI/macro): cross-source narrative convergence and capital-vs-narrative divergence. Remote MCP server, self-serve keys, fails safe (says "no coverage" rather than hallucinating).

Privacy-first document search server running entirely locally. Supports semantic search over PDFs, DOCX, TXT, and Markdown files with LanceDB vector storage and local embeddings - no API keys or cloud services required.

Transform 17 source types (docs, GitHub repos, PDFs, videos, Jupyter, Confluence, Notion, Slack/Discord) into AI-ready skills and RAG knowledge. 35 MCP tools for scraping, packaging, enhancing, and exporting to vector databases (Weaviate, Chroma, FAISS, Qdrant). Supports 16+ tar…

An MCP server for accessing all of CustomGPT.ai's anti-hallucination RAG-as-a-service API endpoints.

An MCP server for Apify's open-source RAG Web Browser Actor to perform web searches, scrape URLs, and return content in Markdown.

"primitive" RAG-like web search model context protocol (MCP) server that runs locally. No APIs needed.