Matrix/Features/Tool calling & MCP
Which voice AI agent platforms have Tool calling & MCP?
Yes = agents can call MCP servers. Partial = custom tool/function calling but no agent-side MCP documented.
6 Yes5 Partial0 Unknown
Verified Yes: Vapi, Retell AI, ElevenLabs Agents, OpenAI Realtime API, LiveKit Agents, Vaani.
| Platform | Status | What the vendor says | Source |
|---|---|---|---|
| ElevenLabs AgentsElevenLabs | Yes | MCP Agents can connect to MCP servers. | Source |
| LiveKit AgentsLiveKit | Yes | MCP client Tools docs cover Model Context Protocol support. | Source |
| OpenAI Realtime APIOpenAI | Yes | Remote MCP Realtime sessions can use remote MCP servers. | Source |
| Retell AIRetell AI | Yes | MCP Agents can call tools on MCP servers. | Source |
| VaaniVaani | Yes | MCP Docs list MCP support. | Source |
| VapiVapi | Yes | MCP tool Native MCP tool lets agents call MCP servers. | Source |
| Bland AIBland | Partial | Custom tools Custom tools are documented. Bland's MCP server controls the Bland API from your editor; it is not agent-side MCP. | Source |
| Cartesia AgentsCartesia | Partial | Tool calls Tool calls supported; agent-side MCP not stated. | Source |
| Deepgram Voice Agent APIDeepgram | Partial | Function calling Function calling documented; agent-side MCP not stated. | Source |
| SynthflowSynthflow | Partial | Custom Actions Custom Actions for tool calls; Synthflow's MCP server manages agents rather than giving agents MCP tools. | Source |
| UltravoxUltravox | Partial | Custom tools Custom tools API documented; MCP not found (docs MCP page 404). | Source |
Checked Nov 4, 2026. Filter the matrix by this feature →
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