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Bug: MCP tool integration is broken in 1.53.0 #12217

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#12226
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Bug: MCP tool integration is broken in 1.53.0#12217
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#12226
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rogerbarreto
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bugSomething isn't working

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@Lanayx
Vladimir Shchur (Lanayx)
opened on May 21, 2025

Describe the bug

kernel.Plugins.AddFromFunctions("CurrentDateTool", tools |> Seq.map _.AsKernelFunction()) |> ignore

Importing plugin from kernel function occurs with prefixed name "plugin_function", while later function is retrieved using just "function" name, so integration is broken later.

Issue is not reproduced in 1.52.0

To Reproduce
Check out the repro, change SemanticKernel version to 1.53.0
https://github.com/Lanayx/Oxpecker/tree/develop/examples/MCP

Expected behavior
MCP function is added as plugin properly and can be used later

Screenshots

Image

Platform

  • Language: [F#]
  • Source: [NuGet package version 1.53.0]
  • AI model: [Ollama + Llama3.2]
  • IDE: [Rider]
  • OS: [Windows]

Activity

  1. Vladimir Shchur (Lanayx)
    added the
    Bug
    issue type on May 21, 2025
  2. Vladimir Shchur (Lanayx)
    added
    bugSomething isn't working
    on May 21, 2025
  3. Mark Wallace (markwallace-microsoft)
    added
    triage
    on May 21, 2025
  4. Roger Barreto (rogerbarreto)
    self-assigned this
    on May 21, 2025
  5. Roger Barreto (rogerbarreto)
    removed
    triage
    on May 21, 2025
  6. Roger Barreto (rogerbarreto)
    added this to Semantic Kernelon May 21, 2025
  7. Roger Barreto (rogerbarreto)
    moved this to Sprint: In Review in Semantic Kernelon May 21, 2025
  8. github-merge-queue
    added a commit that references this issue on May 22, 2025

    .Net: Fixes MCP Behavior for AIFunction.AsKernelFunction() + Fix ensu…

    cecee4c
  9. westey (westey-m)
    closed this as completedin #12226on May 22, 2025
  10. Eduard van Valkenburg (eavanvalkenburg)
    added a commit that references this issue on May 26, 2025

    .Net: Fixes MCP Behavior for AIFunction.AsKernelFunction() + Fix ensu…

    2ad196e
  11. Roger Barreto (rogerbarreto)
    moved this from Sprint: In Review to Sprint: Done in Semantic Kernelon May 28, 2025
  12. jcruzmot-te
    added a commit that references this issue on Sep 15, 2025

    .Net: Fixes MCP Behavior for AIFunction.AsKernelFunction() + Fix ensu…

    51b1515
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