# Mcp client side adds a variable that doesn't exist in the server side

**URL:** <https://community.retellai.com/t/mcp-client-side-adds-a-variable-that-doesnt-exist-in-the-server-side/3731>\
**Category:** Support Help\
**Tags:** bug\
**Created:** [October 6, 2026, 8:41pm UTC](https://community.retellai.com/t/mcp-client-side-adds-a-variable-that-doesnt-exist-in-the-server-side/3731 "2026-10-06T20:41:13Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![duncan](https://yyz2.discourse-cdn.com/flex008/user_avatar/community.retellai.com/duncan/32/1096_2.png) [@duncan](https://community.retellai.com/u/duncan)\
**Post date:** [October 6, 2026, 8:41pm UTC](https://community.retellai.com/t/mcp-client-side-adds-a-variable-that-doesnt-exist-in-the-server-side/3731/1 "2026-10-06T20:41:13Z")

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call\_269cd9045339ced7908996ed6fd why does the mcp client side add “clinicnum” a variable not available when fetching details? @support12@support11

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**Author:** ![mark1](https://yyz2.discourse-cdn.com/flex008/user_avatar/community.retellai.com/mark1/32/2524_2.png) [@mark1](https://community.retellai.com/u/mark1)\
**Post date:** [October 6, 2026, 8:47pm UTC](https://community.retellai.com/t/mcp-client-side-adds-a-variable-that-doesnt-exist-in-the-server-side/3731/2 "2026-10-06T20:47:52Z")

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Hey @duncan

Thanks for sharing the Call ID.

Could you also please share the **Agent ID** associated with this call and, if possible, the **MCP tool/server name** where `clinicnum` is appearing unexpectedly?

Best Regards.