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 agentmods add skills/microsoft/agents/agents-sdk-dotnetnpx skills add microsoft/Agents --skill agents-sdk-dotnetgit clone --depth 1 https://github.com/microsoft/AgentsWhat 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 | $0.00112 | $0.05083 |
| Opus 5 | $0.00056 | $0.02542 |
| Sonnet 5 | $0.00022 | $0.01017 |
| Haiku 4.5 | $0.00011 | $0.00508 |
Grade A, and why
agents-sdk-dotnet scanned grade A with 1 finding 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -s -X POST \ How it starts
The opening of the file, as written. The whole thing — 770 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Overview
The Microsoft 365 Agents SDK builds multichannel agents for Teams, Copilot Studio, and web chat.
| Package | Purpose |
|---|---|
Microsoft.Agents.Hosting.AspNetCore |
ASP.NET Core hosting, auth, endpoint mapping |
Microsoft.Agents.Authentication.Msal |
MSAL-based auth (client credentials, OBO) |
Microsoft.Agents.Builder |
Core: AgentApplication, ITurnContext, ITurnState |
Microsoft.Agents.Core |
Models, activity types, channel accounts |
Microsoft.Agents.Storage |
IStorage, MemoryStorage |
Microsoft.Agents.Extensions.Teams |
Teams-specific models and extensions |
Microsoft.Agents.Builder.Dialogs |
Dialog system (waterfall, prompts) |
Microsoft.Agents.AI |
AI-specific features |
Minimal project requires only: Microsoft.Agents.Hosting.AspNetCore + Microsoft.Agents.Authentication.Msal. The others are transitive dependencies pulled in automatically.
Always use the latest non-beta (stable) version. Do not use --prerelease unless specifically needed.
Requires .NET 8+.
Azure Resources Required
Microsoft Entra App Registration
ClientId— Application (client) IDClientSecret— Certificates & secretsTenantId— Directory (tenant) ID
Azure Bot Resource
- Messaging endpoint:
https://<your-host>/api/messages - Microsoft App ID must match
ClientId
Local dev: Set TokenValidation:Enabled to false. No Azure Bot needed until deployment.
Configuration (appsettings.json)
Single connection (most common)
appsettings.json — no secret here (safe to commit):
{
"Connections": {
"ServiceConnection": {
"Settings": {
"AuthType": "ClientSecret",
"AuthorityEndpoint": "https://login.microsoftonline.com/<tenantId>",
"ClientId": "<appId>",
"Scopes": ["https://api.botframework.com/.default"]
}
}
},
"ConnectionsMap": [
{
"ServiceUrl": "*",
"Connection": "ServiceConnection"
}
],
"TokenValidation": {
"Enabled": true,
"Audiences": ["<appId>"],
"TenantId": "<tenantId>"
}
}
What ships with it
2 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.
- 2d ago First seen · 770 lines · 112 tokens per session scan A 4a4f4e16df1b
agents-sdk-dotnet is a skill published in the GitHub repository microsoft/Agents (1,050 stars, last pushed 5d ago), licensed MIT. It adds 112 tokens to every session and 5,083 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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