what does this mean
# ❓・ai-evy-supportb
Bobster2002
12/29/2025, 10:29 PMa
AI Evy
12/29/2025, 10:29 PMThanks for tagging me @Bobster2002. I'll look through relevant sources and get back to you shortly.
AI Evy
12/29/2025, 10:29 PMmessage has been deleted
AI Evy
12/29/2025, 10:29 PM### Answer
I'd be happy to help, but I need a bit more context. Could you share what specific error message, code snippet, or concept you're asking about?
Once you provide more details, I can give you a more useful answer about Retell AI.
AI Evy
12/29/2025, 10:29 PMFeel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.
b
Bobster2002
12/29/2025, 10:30 PMError
Tool name must be unique across general tools + tools of the state + state transitions. Duplicte name found:
I'm using two agents with the same MCP tool, there's no way to add an existing MCP tool even though it exists, and it doesn't let me add it.
Bobster2002
12/29/2025, 10:30 PM@AI Evy Error
Tool name must be unique across general tools + tools of the state + state transitions. Duplicte name found:
I'm using two agents with the same MCP tool, there's no way to add an existing MCP tool even though it exists, and it doesn't let me add it.
a
AI Evy
12/29/2025, 10:30 PMThanks for the follow-up, @Bobster2002. I'll get back to you soon.
AI Evy
12/29/2025, 10:30 PM### Answer
---
The error you're seeing indicates that tool names must be unique within a single agent's configuration—across general tools, state-specific tools, and state transitions. [(1) ]()
Unfortunately, the available documentation doesn't explicitly cover the scenario of reusing the same MCP tool across multiple agents or how to handle duplicate tool names when configuring MCP tools on separate agents.
What you can try:
- Rename the MCP tool to a unique name for each agent (even if they point to the same underlying MCP server/endpoint) .
- If both agents need the exact same tool, consider whether Agent Transfer might help consolidate the workflow into a single agent that uses the MCP tool once. [(2) ]()
For a definitive answer on whether there's a way to share MCP tool configurations across agents without renaming, I'd recommend reaching out to Retell support:
- Visit [Contact Sales]()
- Check out the [Retell AI GitHub]()
Would you like me to try a general answer based on my knowledge instead?
AI Evy
12/29/2025, 10:30 PM
To learn more, see the sources I considered:
[[1] Connect any AI Voice Agent to MCP with Retell AI MCP Node (Guide) | Retell AI](https://www.retellai.com/blog/connect-any-ai-voice-agent-to-mcp-with-retell-ai-mcp-node)
[[2] Agent Transfer](https://docs.retellai.com/build/single-multi-prompt/transfer-agent)
AI Evy
12/29/2025, 10:30 PMFeel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.