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/.github/copilot-instructions.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/copilot-instructions)<a href="https://agentmods.dev/instructions/microsoft/agent365-dotnet/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/microsoft/agent365-dotnet/copilot-instructions/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/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/microsoft/agent365-dotnet/copilot-instructions.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 | $0.02196 | $0.02196 |
| Opus 5.5 | $0.00878 | $0.00878 |
| Sonnet 5.5 | $0.00439 | $0.00439 |
| Haiku 4.5 | $0.00220 | $0.00220 |
Grade A, and why
Agent365-dotnet copilot-instructions.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 — 182 lines — stays where its author put it; the contents beside it link to each section on GitHub.
GitHub Copilot Instructions for Agent365-dotnet
The Microsoft Agent 365 SDK (C#/.NET) extends the Microsoft 365 Agents SDK with enterprise capabilities across four modules: Observability, Notifications, Runtime, and Tooling. Packages publish to NuGet under the Microsoft.Agents.A365.* prefix.
Build, Test, and Lint
All commands run from the repository root unless noted. Requires the .NET 8.0.100 SDK (pinned in src/global.json).
# Build / test the whole solution
dotnet build src/Microsoft.Agents.A365.Sdk.sln
dotnet test src/Microsoft.Agents.A365.Sdk.sln
# Build script (traversal build via src/dirs.proj) — preferred for full runs
./build/build.ps1 # Release build
./build/build.ps1 -Clean -Restore -Test # clean rebuild + tests
./build/build.ps1 -Pack # produce NuGet packages
# Run all tests in ONE project
dotnet test src/Tests/Microsoft.Agents.A365.Runtime.Tests/Microsoft.Agents.A365.Runtime.Tests.csproj
# Run a SINGLE test or test class (xUnit primary; some MSTest)
dotnet test src/Microsoft.Agents.A365.Sdk.sln --filter "FullyQualifiedName~TenantContextHelperTests"
dotnet test src/Microsoft.Agents.A365.Sdk.sln --filter "Name=Extract_Returns_TenantId"
# Format check (enforced as a pre-commit hook)
dotnet format src/Microsoft.Agents.A365.Sdk.sln --verify-no-changes
CI (.github/workflows/ci.yml) builds and tests in Release with --no-restore/--no-build, then packs. Some Observability/Tooling tests read AZURE_OPENAI_ENDPOINT, AZURE_OPENAI_API_KEY, and AZURE_OPENAI_DEPLOYMENT from the environment.
Pre-commit hooks (.pre-commit-config.yaml, install with pip install pre-commit && pre-commit install) run gitleaks (secret scanning), whitespace/EOL fixers, and dotnet format.
Architecture
The SDK follows a consistent Core + Extensions pattern. Each module has a Core/Runtime package with base functionality and per-framework extension packages (SemanticKernel, AgentFramework, AzureAIFoundry, OpenAI). Source lives under src/<Module>/:
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 · 182 lines · 2,196 tokens per session scan A 59c5955257f3
Agent365-dotnet copilot-instructions.md is an instructions file published in the GitHub repository microsoft/Agent365-dotnet (29 stars, last pushed 2d ago), licensed MIT. It adds 2,196 tokens to every session, about $0.0088 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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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).