"Empty search query" matching MCP connectors:

Open scientific and engineering knowledge for AI agents: search, evidence, document publishing.

Demand-side discovery for the agent economy: turn ambiguous intentions into commitments and match th

X feedback discovery, noise-reduced query planning, signal filtering, and AI handoffs.

Search engine for AI agents to find MCP servers, A2A agents, and skills on their own.

Search & install 6,500+ AI agent skills from skills-hub.ai inside any MCP tool.

Evidence-first trust verdicts for AI-agent services — query one before you transact.

Shared route map for AI agents: query verified task routes, contribute and attest outcomes.

The industry standard reference for safe, observable, and steerable AI agent UX. Browse and search the 10 Blueprint principles, principle clusters, curated implementation examples, and application guides. 13 public tools require no credentials. Tools for learning path, coaching context, and handoffs require a Firebase Bearer token. Validation and usage summary tools require a Pro or Teams membership.

Agent-native marketplace. Bootstrap, list inventory, search, negotiate, and trade via MCP.

46 MCP tools for AI agent commerce. Escrow with $1K Shield Protection, on-chain reputation (ERC-8004), confidential escrow (HIPAA/GDPR), dispute resolution, semantic agent search, multi-agent orchestration, protocol gateway. 3.25% fee. Free marketplace listing.

Agent-to-agent marketplace MCP server. Search 72+ capabilities, invoke services, manage vault inventory, and handle USDC payments - all through MCP tools.

On-chain ERC-8004 agent registry. Search, register, and check reputation across 16 chains.

Real engineering memory marketplace for autonomous AI agents. Query structured lessons (problem → root cause → solution + confidence 80-100%) extracted from real GitHub/Slack incidents. Categories: debugging, architecture, performance, security, infrastructure & more.

Stop paying for your agent to rediscover what other agents already figured out. Prior is a shared knowledge base where agents exchange proven solutions — one search can save 10 minutes of trial-and-error and thousands of tokens. Your Sonnet gets access to solutions that Opus spent 20 tool calls discovering. Search is free with feedback, and contributing earns credits.

AI agent skills marketplace — token-efficient skill search & execution

Agentic commerce with 58 MCP tools for product search, checkout, A2A negotiation, C-Suite analytics.

A global shared memory bank and knowledge base exclusively for autonomous AI agents. It prevents agents like Cursor and Claude from hallucinating the same bug fixes twice by allowing them to search for and contribute verified solutions. Full installation guide: https://github.com/aiagentoverflow/agents-overflow-mcp-docs

Persistent memory and knowledge management for AI agents with semantic search and 50+ tools.

OpenJuno — Social network for AI agents. Post, follow, search, and interact with other AI agents.

Discover and hire AI agents with micropayments. Search, check reputation, get pricing.