Feature
Agent Skills
Packaged skills and instructions for AI agents.
35 providers
132 APIs
31 declared variants
Reusable skill packages, agent instructions, or AGENTS.md-style guidance that teach an agent how to use the product correctly. Turns raw endpoints into reliable agent behavior.
35 API providers on the APIs.io network offer agent skills. The highest-rated are Regal, Anthropic, Knock, UserGems, Swell.
Providers
Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.
Exemplar 7 Complete, well-documented, and agent-ready
RegalRegal is a New York City-based AI Agent Platform purpose-built for contact center operations. The Regal pla...AnthropicAnthropic is an AI safety company and the creator of the Claude family of large language models (Opus, Sonn...KnockKnock is notifications infrastructure as a service — a product and customer messaging platform you use to p...UserGemsUserGems is a San Francisco-based sales intelligence platform that tracks champion job changes and surfaces...SwellSwell is a customizable, API-first headless commerce platform powering modern B2C, B2B, subscription, and m...OmnisendOmnisend is a Lithuanian-headquartered email and SMS marketing automation platform purpose-built for ecomme...Tomorrow.ioTomorrow.io is a Boston-based weather intelligence platform combining a global proprietary numerical weathe...
Strong 10 Solid coverage with minor gaps
ReductoReducto is an AI document-parsing platform that turns unstructured PDFs, images, spreadsheets, slides, and ...AffindaAffinda is an Intelligent Document Processing (IDP) platform that uses AI to extract structured data from d...AshbyAshby is a modern all-in-one recruiting platform combining Applicant Tracking System (ATS), sourcing/CRM, i...Apollo.ioApollo.io is a sales intelligence and go-to-market platform combining a database of 240M+ contacts and 30M+...OktaOkta is the workforce identity incumbent — its Identity Cloud platform (also called the Okta Workforce Iden...emnifyemnify is a cloud-native global IoT cellular connectivity provider operating its own mobile core and SuperN...parcelLabparcelLab is a Munich-headquartered post-purchase experience platform (parcelLab GmbH) used by retailers in...Auth0Auth0 (now part of Okta) is a leading identity-as-a-service platform providing authentication and authoriza...Arcade.devArcade.dev (formerly Arcade AI) is the MCP runtime for production AI agents — a platform that lets agents s...AssembledAssembled is a San Francisco-headquartered support operations platform that unifies workforce management (W...
Developing 12 Usable, with meaningful gaps to close
OxylabsOxylabs is a Lithuanian (Vilnius-based) web intelligence platform providing premium proxy networks (Residen...Oracle IntegrationOracle Integration provides native connectivity to Oracle and non-Oracle Software as a Service (SaaS) and o...FactorialFactorial is an all-in-one HR, payroll, time, talent, finance, and IT management platform headquartered in ...SpeakeasyThe platform to Build APIs your users love. Best in class API tooling for robust SDKs, API docs, Terraform ...StytchStytch is an authentication and identity infrastructure provider. Its Consumer and B2B APIs cover passwordl...LangWatchLangWatch is an open-source LLM observability, evaluation, and AI agent testing platform. Built around Open...WorkOSWorkOS is the "Enterprise Ready" identity platform for B2B SaaS — providing AuthKit user management, enterp...Instabug (Luciq)Instabug — now rebranded as Luciq — is an agentic mobile observability platform covering bug reporting, cra...WrikeWrike is a collaborative work management platform used by 30,000+ organizations. The Wrike Developer Platfo...ActivepiecesActivepieces is an open-source, no-code automation platform that enables users to streamline workflows by c...APIToolkit (Monoscope)APIToolkit (now Monoscope) is an open-source-friendly API observability and monitoring platform that helps ...MubertMubert is a generative AI music platform that composes royalty-free, DMCA-free music in real time from mill...
Thin 4 Limited public surface area
FernFern is an SDK generation and documentation platform designed for the AI era. It transforms OpenAPI, AsyncA...FormantFormant is a San Francisco–based robotics and physical-operations cloud platform that lets companies operat...FactoryFactory is an agent-native software development platform whose Droids act as autonomous AI engineers that p...CrestaCresta (legally Cresta Intelligence, Inc.) is a Palo Alto, California enterprise Customer Experience AI com...
What Providers Actually Declared
This feature is a canonical term. These are the free-text strings
providers wrote in their own apis.yml that map onto it.
50+ Specialized AI AgentsAGENTS.md repository conventionsAI AgentsAI Agents StudioAI agents: Detect Agent, Resolve Agent, Release AgentAI coding-agent skillsAgent SkillsAgent Skills API (beta) — packaged domain expertise with progressive disclosureAuth0 for AI Agents — Token Vault, async auth, Auth for MCP, FGA for RAG (GA, 50% of base)Cresta Conductor — developer-facing agentic engine for building, testing, and optimizing AI agentsFive provider-published agent skills — four in the MCP plug-in, one for the CLIGem-E AI agents for prospect list building and email personalizationIntegrations with AG2, CrewAI, Google ADK, LangChain (Python / TypeScript), Mastra, OpenAI Agents, Spring AI, TanStack AI, and Vercel AI SDKIntegrations — OpenAI, Anthropic, Azure, AWS Bedrock, LiteLLM, LangChain, LangGraph, DSPy, OpenAI Agents, Pydantic AI, CrewAI, Autogen, HaystackKnock skills — procedural knowledge packages for AI agents working with KnockLLMs Center (llms.reducto.ai) and llms.txt for AI-agent friendly documentationLLMs.txt Indexed DocumentationOfficial Agent Skills for Oxylabs productsOfficial MubertAI/skills repo of Agent Skills (setup, generate, streaming, library, manage)Okta for AI Agents: agent discovery, registration, ownership, least-privilege, revocationPipes: human-approved, provider-scoped credentials for AI agentsPostman public workspace and llms.txt feed for AI-agent friendly discoveryPublic llms.txt and llms-full.txt feeds with inline OpenAPI fragments for AI-friendly documentationSMS, Chat, and WebRTC AI Agents sharing the same prompt, knowledge base, and action libraryUnified workforce management for in-house agents, BPO vendors, and AI agentsis-agent SDK for detecting AI agents / bots client-sidellms.txt Generationllms.txt endpoint for AI agents at https://apidoc.factorialhr.com/llms.txtllms.txt index at developers.ashbyhq.com/llms.txt — every operation page exposes its OpenAPI definition inline in a fenced JSON blockllms.txt index for AI-agent consumption of all docs and OpenAPI endpointsskill.md file for AI agents (Claude Code, Cursor) describing the full API surface
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Work with this as data
Every feature here is available over the APIs.io API and to AI agents over MCP. Features is not yet its own endpoint on the v1 API. Reach it through catalog search and the tag graph, or the MCP server.