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agent-framework-builder-dotnet

agent-framework-builder-dotnet is a skill for Claude Code, Codex from microsoft/agent-framework. It costs 82 tokens per session (1,785 once invoked), scanned A, original, MIT.

A guide for building applications in C# and .NET with Microsoft Agent Framework, a toolkit for creating software agents and workflows. It covers choosing an approach, using the installed packages, making changes, and running focused checks.

In plain words
What is it for?
Use it to build, modify, review, evaluate, connect, or host .NET agents, workflows, tools, sessions, and related integrations.
Why use it?
It reduces the risk of using outdated framework examples or mismatched package APIs. It also encourages checking the existing project before changing it.

Skill for Claude CodeCodex ✓ vendor

Written for no agent in particular: nothing here depends on one.

not rated 14krepo +109 yesterday A scan 82 tokens original MIT

Good fit Use it to build, modify, review, evaluate, connect, or host .NET agents, workflows, tools, sessions, and related integrations.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/microsoft/agent-framework/agent-framework-builder-dotnet
View source ↗ microsoft/agent-framework aka.ms
About the project

Microsoft Agent Framework is a multi-language framework for building, coordinating, and running AI agents and workflows in Python and .NET. Teams use it for agent systems that need orchestration, collaboration, durability, observability, governance, or human involvement beyond a single prompt or chat loop. Catalogue add-ons provide skills and instructions for working with the framework.

microsoft/agent-framework · 14,305 stars · on GitHub · aka.ms

Install

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.

Any agent
npx skills add microsoft/agent-framework --skill agent-framework-builder-dotnet
Clone the repo
git clone --depth 1 https://github.com/microsoft/agent-framework

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for agent-framework-builder-dotnet

README.md
[![agentmods](https://agentmods.dev/badge/skills/microsoft/agent-framework/agent-framework-builder-dotnet/github.svg)](https://agentmods.dev/skills/microsoft/agent-framework/agent-framework-builder-dotnet)
Your own site
<a href="https://agentmods.dev/skills/microsoft/agent-framework/agent-framework-builder-dotnet"><img src="https://agentmods.dev/badge/skills/microsoft/agent-framework/agent-framework-builder-dotnet/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.

agentmods 80×15 button for agent-framework-builder-dotnet

Your own site · 80×15
<a href="https://agentmods.dev/skills/microsoft/agent-framework/agent-framework-builder-dotnet"><img src="https://agentmods.dev/badge/skills/microsoft/agent-framework/agent-framework-builder-dotnet.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 82 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,785 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00082 $0.01785
Opus 5.5 $0.00033 $0.00714
Sonnet 5.5 $0.00016 $0.00357
Haiku 4.5 $0.00008 $0.00178

Measured 2d ago against content hash f4b5279eee44, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

agent-framework-builder-dotnet 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 2d 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.

skills/agent-framework-builder-dotnet/SKILL.md · 115 lines

How it starts

The opening of the file, as written. The whole thing — 115 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Agent Framework builder for .NET

Use this skill as the entry point for .NET Agent Framework application work. Choose the smallest framework pattern that preserves the required behavior, load only the relevant references, and validate against current APIs instead of relying on remembered preview-era syntax.

Workflow

  1. Inspect the existing solution: target frameworks, SDK version, package management (central package management or per-project), and installed Microsoft.Agents.AI.* packages and versions.
  2. Choose the simplest matching path from the table below.
  3. Resolve design questions only when they materially change the implementation.
  4. Read only the linked reference for the selected path.
  5. Implement the smallest coherent change and run the narrowest validation that exercises it.

Core abstractions

  • A chat client is a Microsoft.Extensions.AI.IChatClient. It sends messages and options to a model provider and returns chat responses or streaming updates. Agent Framework builds on Microsoft.Extensions.AI types such as ChatMessage, AIFunction, and ChatOptions instead of redefining them.
  • An agent derives from AIAgent and exposes RunAsync(...) and RunStreamingAsync(...). ChatClientAgent is the standard implementation: it wraps an IChatClient with instructions, tools, context providers, a chat history provider, and session handling. Provider packages usually create one through an AsAIAgent(...) extension method.
  • A harness agent is a HarnessAgent from Microsoft.Agents.AI.Harness. It wraps a ChatClientAgent with an opinionated set of context providers and agent decorators; it is still an AIAgent.
  • A workflow (Microsoft.Agents.AI.Workflows) coordinates explicit execution paths between executors and agents. AgentWorkflowBuilder provides standard sequential, concurrent, handoff, group-chat, and Magentic patterns over AIAgent participants. A workflow can be exposed as an AIAgent when callers need the agent contract.

Read the full file on GitHub · 115 lines

Files

What ships with it

9 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.

Changes

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.

  1. 2d ago First seen · 115 lines · 82 tokens per session scan A f4b5279eee44

Subscribe to this mod's changes

agent-framework-builder-dotnet is a skill published in the GitHub repository microsoft/agent-framework (14,305 stars, last pushed yesterday), licensed MIT. It adds 82 tokens to every session and 1,785 once invoked, about $0.0003 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 2026-10-24.

Building agentsC# and .NETLanguagesMulti-AgentOrchestrationagent-frameworkagentic-aiagentsai
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