infrastructure capability/tool-calling # Tool calling Function/tool use as a first-class primitive. 12 active agents tagged · verified against the catalog seed. TAGGED ## 12 agents with tool calling [Model Context Protocol Community / OSS · bridge api · local/cloud · Open protocol (free)](https://www.agentlist.io/systems/mcp) [Lindy Lindy · digital-employee chat/api · cloud · Free tier; Pro from ~$49/mo — credit-based, higher tiers scale on tasks](https://www.agentlist.io/systems/lindy) [CrewAI CrewAI · agent-communication api/cli · local/cloud · Free OSS core; CrewAI Enterprise paid (verify)](https://www.agentlist.io/systems/crewai) [Microsoft Agent Framework Microsoft · agent-communication api · local/cloud · Free OSS (MIT); Azure hosting via Foundry](https://www.agentlist.io/systems/agent-framework) [LangGraph LangChain · agent-communication api · local/cloud · Free OSS; LangGraph Platform paid tiers](https://www.agentlist.io/systems/langgraph) [MetaGPT DeepWisdom · agent-communication api/cli · local/cloud · Free OSS; MGX hosted product paid (verify)](https://www.agentlist.io/systems/metagpt) [CAMEL CAMEL-AI · agent-communication api · local/cloud · Free (OSS, Apache-2.0)](https://www.agentlist.io/systems/camel) [Agency Swarm VRSEN · agent-communication api · local/cloud · Free (OSS)](https://www.agentlist.io/systems/agency-swarm) [OpenAI Agents SDK OpenAI · agent-communication api · local/cloud · Free (OSS SDK); model usage metered](https://www.agentlist.io/systems/openai-agents-sdk) [Arcade Arcade · agent-services api · cloud · Free tier; usage-based (verify)](https://www.agentlist.io/systems/arcade) [Composio Composio · agent-services api · local/cloud · Free tier; usage-based (verify)](https://www.agentlist.io/systems/composio) [Grok Voice Agent API xAI · voice-agent api/voice · cloud · $0.08/min agent audio; telephony +$0.01/min; STT $0.10-0.20/hr; TTS $4.20/M chars](https://www.agentlist.io/systems/grok-voice) RELATED ## Related capabilities - [Agent identity & auth](https://www.agentlist.io/capabilities/identity) - [Agent payments](https://www.agentlist.io/capabilities/payments) - [Agent-to-agent protocol](https://www.agentlist.io/capabilities/a2a) - [API-native](https://www.agentlist.io/capabilities/api-native) - [MCP tools](https://www.agentlist.io/capabilities/mcp) - [Messaging surface](https://www.agentlist.io/capabilities/messaging-infra) - [Multi-agent orchestration](https://www.agentlist.io/capabilities/multi-agent) - [Sandbox runtime](https://www.agentlist.io/capabilities/sandbox-runtime) - [Self-hostable](https://www.agentlist.io/capabilities/self-hostable) --- Source: [Tool calling — 12 AI agents | agentlist.io](https://www.agentlist.io/capabilities/tool-calling). This is the public page rendered as Markdown; interactive controls require the website.