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)
Lindy
Lindy · digital-employee
chat/api · cloud · Free tier; Pro from ~$49/mo — credit-based, higher tiers scale on tasks
CrewAI
CrewAI · agent-communication
api/cli · local/cloud · Free OSS core; CrewAI Enterprise paid (verify)
Microsoft Agent Framework
Microsoft · agent-communication
api · local/cloud · Free OSS (MIT); Azure hosting via Foundry
LangGraph
LangChain · agent-communication
api · local/cloud · Free OSS; LangGraph Platform paid tiers
MetaGPT
DeepWisdom · agent-communication
api/cli · local/cloud · Free OSS; MGX hosted product paid (verify)
CAMEL
CAMEL-AI · agent-communication
api · local/cloud · Free (OSS, Apache-2.0)
Agency Swarm
VRSEN · agent-communication
api · local/cloud · Free (OSS)
OpenAI Agents SDK
OpenAI · agent-communication
api · local/cloud · Free (OSS SDK); model usage metered
Arcade
Arcade · agent-services
api · cloud · Free tier; usage-based (verify)
Composio
Composio · agent-services
api · local/cloud · Free tier; usage-based (verify)
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
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