"A system for building an autonomous second brain" matching MCP servers:

Provides a Docker container for managing markdown notes with semantic search and an MCP server to expose brain tools to AI clients like Claude.

Enables AI assistants to search a shared local archive of selected sessions, notes, and connected sources, returning source-backed context and citations through read-only MCP access.

This MCP server implements a second brain system, managing unvalidated investigation cases as JSON and validated knowledge as markdown files and skills. It provides tools for creating, updating, promoting cases, managing knowledge files, and performing semantic search.

MCP server that ingests YouTube videos and podcasts, making them searchable with timestamps and deep links to exact moments.

Self-maintaining personal knowledge database — MCP server with figure-level search, auto-wikilinks, and Ebbinghaus-based memory compression

An MCP server that exposes an Obsidian vault to Claude, enabling reading, searching, writing notes, capturing voice thoughts, and managing tasks. It enforces vault filing rules in code, with path confinement and no hard deletes for safety.

Turns an Obsidian vault of plain Markdown notes into memory shared by every Claude client, so notes, people, meetings, and follow-ups carry across chats and devices. Provides tools to search, read, capture, write, and link notes, and to track people, organizations, connections, and interactions.

Turns an Obsidian vault into semantic memory for coding agents, providing read-only semantic search and a human-approved write workflow via MCP.

Enables AI assistants to file notes into a self-hosted Obsidian vault and retrieve them later through structured and semantic search over plain Markdown.

Enables capturing, searching, and organizing Obsidian notes from Telegram via Hermes Agent (MCP).

Enables LLM clients to read, search, create, update, and delete notes in a self-hosted shared memory bank over MCP, using hybrid vector and full-text search with optional summarization.

Enables any Claude client to capture bullet notes into a GitHub-backed markdown vault's inbox and read files from that vault through the GitHub Contents API.

Enables AI clients to search and append to a local Markdown knowledge base through MCP, with automatic incremental indexing and offline hybrid retrieval.

A small, authenticated remote MCP server that lets an AI app safely read and write one GitHub repository, built for a second-brain / Obsidian vault stored on GitHub.

Runs a local, read-only knowledge graph over MCP, enabling graph queries, path finding, explanations, neighbor exploration, statistics, and god-node discovery without cloud dependencies.

Provides semantic search, note retrieval, source explanation, daily digests, and health checks for a local Obsidian vault, enabling MCP clients like Claude Desktop and Claude Code to query the second brain via natural language.

A personal AI-powered knowledge base MCP server that allows Claude to search, add, list, and delete documents from a local knowledge base.

Provides an intelligent, graph-based memory system for LLM agents using the Zettelkasten principle, enabling automatic note construction, semantic linking, memory evolution, and autonomous graph maintenance with background optimization processes.

Enables Claude to review drafts by fact-checking claims against web sources, building the strongest counter-argument, suggesting copy edits, and flagging potentially unoriginal text, returning a sourced report.

Provides 12 tools to query South Korean building register data, including title sheets, floor details, and official house prices via the data.go.kr API. It enables users to perform smart building lookups and region code searches using natural language.

Lets MCP-aware agents consult rival LLMs mid-conversation, sending questions to a specific provider or fanning out to OpenAI, Gemini, Anthropic, and xAI/Grok in parallel for second opinions.

Runs locally on your Mac to give AI agents a shared, private memory of your profile, notes, projects, and saved web pages, with semantic search and version history.

Turns a plain-Markdown Obsidian vault into a second brain that any MCP-speaking coding agent can search, read, extend, and maintain, using swappable SQLite, Qdrant, or markdown memory backends with automatic re-indexing and wiki-link graph navigation. Exposes read, write, and index tools plus an operator CLI for health, linting, and graph export.

Evaluates proposed crypto trades against historical base rates and live order-book costs before Binance execution, returning APPROVE, CAUTION, or VETO decisions to guard against hallucinated trading rationales.

Combines structured sequential thinking with batch operation execution, enabling step-by-step reasoning with revision/branching capabilities and chained operations with variable piping between steps.

A private, local AI second brain for Markdown notes, providing hybrid search and read/write tools for MCP-compatible AI clients like Claude and Cursor.

A natural language interface for the Brain knowledge management system, enabling conversational interactions, intelligent workflows, and tool suggestions.

Enables AI agents to perform workspace file operations (read/write/recover) with transaction-safe guarantees, durable recovery, and explicit human approval via a separate Broker.

Serves a PARA-structured, Obsidian-compatible Markdown vault as read tools plus a constrained capture tool that only creates new notes in the inbox, enabling MCP clients to read and capture to a second brain.

Enables Claude to consult over 17 AI platforms and 800,000+ models to provide alternative perspectives, code reviews, and diverse feedback. It features a unique personality system and supports multi-AI group discussions and debates directly within the chat interface.