Microsoft Agent 365 SDK is a C#/.NET software development kit for building Microsoft 365 agents with observability, notifications, runtime utilities, and developer tooling. Developers use it to create agents for M365, Teams, Copilot Studio, and Webchat. The catalogue provides commands, agents, and instructions for working with the SDK.
Borrowing it
Nothing to install: this file belongs to microsoft/Agent365-dotnet. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/microsoft/Agent365-dotnet/main/CLAUDE.mdgit clone --depth 1 https://github.com/microsoft/Agent365-dotnetWrote 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/instructions/microsoft/agent365-dotnet/claude-md)<a href="https://agentmods.dev/instructions/microsoft/agent365-dotnet/claude-md"><img src="https://agentmods.dev/badge/instructions/microsoft/agent365-dotnet/claude-md/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/instructions/microsoft/agent365-dotnet/claude-md"><img src="https://agentmods.dev/badge/instructions/microsoft/agent365-dotnet/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.02322 | $0.02322 |
| Opus 5.5 | $0.00929 | $0.00929 |
| Sonnet 5.5 | $0.00464 | $0.00464 |
| Haiku 4.5 | $0.00232 | $0.00232 |
Grade A, and why
Agent365-dotnet CLAUDE.md 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 — 247 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
Build Commands
Basic Build Operations
# Build the entire solution
dotnet build src/Microsoft.Agents.A365.Sdk.sln
# Build using PowerShell script (recommended)
./build/build.ps1
# Full clean rebuild
./build/build.ps1 -Clean -Restore
# Build with tests
./build/build.ps1 -Test
# Build with NuGet packaging
./build/build.ps1 -Pack
# Debug build with tests
./build/build.ps1 -Configuration Debug -Test
Testing
# Run all tests
dotnet test src/Microsoft.Agents.A365.Sdk.sln
# Run tests using build script
./build/build.ps1 -Test
# Run tests for a specific project
dotnet test src/Tests/Runtime.Tests/Microsoft.Agents.A365.Runtime.Tests.csproj
Package Management
- All package versions are centralized in
src/Directory.Packages.props - To add a new package: add the version to
Directory.Packages.props, then reference without version in the.csproj - Never specify versions directly in project files
Code Standards
Copyright Headers
Every C# file must include this header at the top:
// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.
Exceptions:
- Auto-generated files (
.g.cs,.designer.cs, files with<auto-generated>markers) - Files in
bin/,obj/directories - Third-party or vendored code
Legacy References
- Never use the keyword "Kairo" in any code - this is legacy terminology that must be replaced
Observability Export Configuration — Coordinated Review Required
The following three constants must stay in sync. If a PR changes any one of them, the reviewer (human or Copilot) must ask the author to confirm the other two are still correct:
| Constant | Location |
|---|---|
ProdObservabilityScope |
src/Observability/Runtime/Common/EnvironmentUtils.cs (accessed via GetObservabilityAuthenticationScope()) |
DefaultEndpointHost |
src/Observability/Runtime/Tracing/Exporters/Agent365ExporterOptions.cs |
| Export URL path pattern | BuildEndpointPath() in src/Observability/Runtime/Tracing/Exporters/Agent365ExporterCore.cs |
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 First seen · 247 lines · 2,322 tokens per session scan A 17b8ee92432b
Agent365-dotnet CLAUDE.md is an instructions file published in the GitHub repository microsoft/Agent365-dotnet (29 stars, last pushed 2d ago), licensed MIT. It adds 2,322 tokens to every session, about $0.0093 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.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).