Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add managedcode/dotnet-skills --skill semantic-kernelgit clone --depth 1 https://github.com/managedcode/dotnet-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/managedcode/dotnet-skills/semantic-kernel)<a href="https://agentmods.dev/skills/managedcode/dotnet-skills/semantic-kernel"><img src="https://agentmods.dev/badge/skills/managedcode/dotnet-skills/semantic-kernel/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/managedcode/dotnet-skills/semantic-kernel"><img src="https://agentmods.dev/badge/skills/managedcode/dotnet-skills/semantic-kernel.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00116 | $0.02403 |
| Opus 5.5 | $0.00046 | $0.00961 |
| Sonnet 5.5 | $0.00023 | $0.00481 |
| Haiku 4.5 | $0.00012 | $0.00240 |
Grade A, and why
semantic-kernel scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 292 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Semantic Kernel for .NET
Trigger On
- adding AI-driven prompts, plugins, or orchestration to a .NET app
- reviewing kernel construction, service registration, or plugin usage
- building function-calling patterns with LLMs
- migrating older Semantic Kernel code to current APIs
Documentation
- Semantic Kernel Overview
- Plugins and Functions
- Agent Functions
- GitHub Repository
- Semantic Kernel .NET 1.80.1 release
- Microsoft Agent Framework
References
- patterns.md - Plugin patterns, function calling patterns, multi-agent patterns, prompt templates, and RAG patterns
- anti-patterns.md - Common Semantic Kernel mistakes and how to avoid them
Core Concepts
| Concept | Description |
|---|---|
| Kernel | Central orchestrator for AI services and plugins |
| Plugin | Collection of functions exposed to the LLM |
| Function | Native C# method or prompt template |
| Chat Completion | LLM service for generating responses |
| Memory | Vector storage for semantic search |
Workflow
- Build the Kernel with required services
- Create Plugins with well-described functions
- Configure Function Calling for automatic tool use
- Handle Responses and manage conversation state
- Test and Observe AI behavior with logging
- For Semantic Kernel
dotnet-1.79.0and later, keep OpenAPI plugin server URL validation enabled, do not re-enable automatic redirects on the defaultHttpPluginorWebFileDownloadPluginclients without an explicit trusted-host policy, and use the current Microsoft Agent Framework-compatible migration samples when moving SK agent code to Agent Framework. - Re-test Cosmos DB vector-store queries, file and document plugins, OpenAPI server-variable URLs, and Ollama reasoning settings after upgrading to
1.79.0. The release fixes the Cosmos vector-store path, rejects mixed-separator UNC paths, URL-encodes OpenAPI server variables, adds OllamaThink, and allows deterministicTimePlugintests throughTimeProviderinjection. - Treat the Prompty.Core
2.0.0-beta.3update in1.79.0as a breaking dependency change. Re-run prompt-template tests and remove security workarounds that are no longer needed after the vulnerable transitive version is gone. - In
1.80.0, re-test OpenAPI plugin HTTP-client defaults and Gemini calls that restrictFunctionChoiceBehaviorto a supplied function list. The migrated .NET MEVD providers are no longer owned by Semantic Kernel; follow their redirect guidance and keep vector-provider package references explicit during upgrades.
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago Changed · +2 lines 3c3298308f75
- 1mo ago First seen · 290 lines · 116 tokens per session scan A 9b6da01afa5a
semantic-kernel is a skill published in the GitHub repository managedcode/dotnet-skills (489 stars, last pushed yesterday), licensed MIT. It adds 116 tokens to every session and 2,403 once invoked, about $0.0005 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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