What is 4agent?
4agent is a curated directory of APIs, MCP servers, and developer services that AI agents can use to search, act, store data, communicate, and deploy software.
Start with the task
What should your agent accomplish?
Agent task
Research the web
Find, inspect, extract, and synthesize reliable information from the open web.
5 required capabilities →
Agent task
Build and deploy software
Write, execute, test, and ship code from an agent workflow.
4 required capabilities →
Agent task
Manage memory and knowledge
Keep useful context available across long-running tasks and sessions.
3 required capabilities →
Agent task
Communicate with users
Send timely, personalized messages and handle conversations across channels.
3 required capabilities →
Agent task
Automate business workflows
Connect services and coordinate durable multi-step operational work.
4 required capabilities →
Agent task
Operate production agents
Secure, observe, evaluate, and improve agents after they ship.
4 required capabilities →
New: Agent Recipes
A tool list is not a plan
Recipes turn a task into ordered capabilities, recommended tools, alternatives, inputs, outputs, and failure paths. Read them on the web or load them as JSON.
Explore recipes →Executable recipe4 steps
Build a web research agent
A source-backed research pipeline that searches, browses, extracts, synthesizes, and remembers.
Open recipe →Human-readable
Task pages, comparisons, and recipes make tool choices understandable.
Agent-readable
Structured data is available through JSON endpoints, API, and llms.txt.
Composable
Capabilities and fallbacks make tools interchangeable instead of hard-coded.
Tool catalog
Explore every agent-ready tool
227 tools
21stCLI
Deployment · Hosting
Hosted infrastructure for deploying persistent AI agents
Freetypescript, python
ActiveloopCLI
Vector DB · Database · Data
Deep Lake database for multimodal AI and agent memory
Freepython
AgentCashMCPCLI
Payment · Data
A wallet and paid API marketplace built for AI agents
Pay per API call
AgentHaus
Deployment · Observability
Visual agent builder that exports production-ready TypeScript
Private launchtypescript
Agentic FabriqMCPCLI
Auth · Identity
Identity and permissioning for AI agents through a governed MCP gateway
Freepython
AgentMailMCP
Email · Communication
Email inbox API for AI agents — give your agent its own email address
Freetypescript, python
AgentOpsMCP
Observability · Monitoring
Session replay, monitoring, and evaluation for AI agents
Freetypescript, python
AgentQL
Browser · Web Scraping · Data
Semantic web interaction and data extraction for AI agents
Freetypescript, python
AgentuityMCPCLI
Deployment · Hosting · Sandbox · Observability
Full-stack cloud platform built for AI agents
Freetypescript
AirbyteMCPCLI
Data · Database
Data and context layer for production AI agents
Freepython
AirweaveMCPCLI
Search · Data · Memory
Open-source context retrieval for AI agents
Freetypescript, python
AlgoliaMCPCLI
Search · Data
AI-powered search and discovery API for developers
Freejavascript, python, php, ruby, go, java, kotlin, swift
ApifyMCPCLI
Browser · Web Scraping
Cloud platform for web scraping, crawlers, and automation Actors
Freetypescript, python
ArcadeMCP
Auth · Data
MCP runtime for secure, production AI agent tool use
Freetypescript, python
Arga LabsMCPCLI
Sandbox · Code Execution · Observability
Stateful service twins for testing and training AI agents
Free
Arize PhoenixMCPCLI
Observability · Monitoring
Open-source tracing and evaluation for LLM applications
Freetypescript, python
PostBridge
Data
Host WordPress in Shopify subfolders and export Notion docs to your CMS
$29/month
AssemblyAI
Audio · Data
Speech AI APIs for transcription, understanding, and voice agents
Freetypescript, python, go, java, csharp, ruby
Auth0MCPCLI
Auth · Identity
Identity and delegated authorization for AI agents
Freejavascript, python, go, java
AutoSendMCP
Email · Communication
Email platform for developers and AI agents — transactional and marketing
Freetypescript, python
AxiomCLI
Observability · Monitoring · Data
Cloud-native logs, traces, and event data for agent systems
Freetypescript, python, go
Baserun
Observability · Monitoring
Observability, testing, and evaluations for LLM applications
Freetypescript, python
BentoLabs AI
Monitoring · Observability
Monitoring and learning for long-running AI agents
Freetypescript, python
Better AuthMCPCLI
Auth · Identity
The most comprehensive authentication framework for TypeScript
Freetypescript
Bland AIMCPCLI
Audio · Communication
Enterprise API platform for automated AI phone calls
Freetypescript, python
BlaxelMCPCLI
Sandbox · Code Execution · Deployment
Perpetual sandbox platform — sandboxes that sleep but never die
Freetypescript, python
BoundaryCLI
Code Execution · Data
BAML programming language for reliable structured AI outputs
Freetypescript, python, go, ruby
BraintrustMCPCLI
Observability · Monitoring · Data
Evaluation, tracing, and prompt management for AI products
Freetypescript, python
Brave SearchMCP
Search
Privacy-focused search API with web, news, image, and video endpoints
Freepython, javascript, go
BrowserbaseMCP
Browser · Web Scraping
Headless browser infrastructure built for AI agents
Freetypescript, python
Make your tool discoverable by agents
Submit structured integration details and appear in relevant capabilities, tasks, and recipes.
Submit your toolDirectory methodology
How 4agent keeps listings useful
We publish concise, structured facts so developers and agents can compare tools without guessing how each service integrates.
How does 4agent evaluate tools?
Each listing is reviewed for a working product website, a clear agent use case, and practical integration signals such as an API, MCP support, OpenAPI documentation, authentication, SDKs, and pricing.
Integration fields are checked against the official Model Context Protocol specification and OpenAPI Specification.
How often is the catalog updated?
The catalog is reviewed as new tools are submitted and existing listings change. Each public submission is held as a draft until it passes manual review.
Tool pages also expose machine-readable SoftwareApplication data for automated discovery.