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 agents/managedcode/dotnet-skills/background-agentsgit clone --depth 1 https://github.com/managedcode/dotnet-skillsWhat 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 | $0.00021 | $0.01880 |
| Opus 5 | $0.00010 | $0.00940 |
| Sonnet 5 | $0.00004 | $0.00376 |
| Haiku 4.5 | $0.00002 | $0.00188 |
Grade A, and why
background-agents 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.
How it starts
The opening of the file, as written. The whole thing — 246 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Background agents
Background agents let a parent agent delegate independent tasks to named child agents. Each task runs concurrently in its own child-agent session, while the parent keeps a task ID that it can use to wait, retrieve results, continue work, or release the task.
[!IMPORTANT] Background agents are experimental.
Background agents are different from background responses. A background response represents one provider request that the application polls or resumes. A background-agent task invokes another Agent Framework agent and later feeds that agent's text result back to the parent.
Set up background agents manually
Each child agent must have a nonempty, case-insensitively unique name. Give child agents focused instructions and only the tools needed for their delegated role.
::: zone pivot="programming-language-csharp"
Import BackgroundAgentsProvider and add it to a regular agent through ChatClientAgentOptions.AIContextProviders:
using Microsoft.Agents.AI;
using Microsoft.Extensions.AI;
var backgroundProvider = new BackgroundAgentsProvider(
[webSearchAgent, codeAnalysisAgent]);
AIAgent parentAgent = chatClient.AsAIAgent(new ChatClientAgentOptions
{
Name = "research-coordinator",
AIContextProviders = [backgroundProvider],
});
AgentSession session = await parentAgent.CreateSessionAsync();
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 · 246 lines · 21 tokens per session scan A 8ca59ba2610a
background-agents is an agent published in the GitHub repository managedcode/dotnet-skills (477 stars, last pushed 2d ago), licensed MIT. It adds 21 tokens to every session and 1,880 once invoked, about $0.0001 per session on Opus 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 agents, from other repositories
observability
Prometheus-metrikker, OpenTelemetry-tracing, Grafana-dashboards og varsling.
research-agent
Utforsker kodebaser, undersøker problemer og samler kontekst før implementering.
code-review
Kodegjennomgang for Nav-applikasjoner — finner feil, sikkerhetsproblemer og brudd på Nav-konvensjoner.
rust-agent
Idiomatisk Rust-utvikling med cargo, clippy, error handling, async/tokio, unsafe og testing.
aksel-agent
Ekspert på Navs Aksel designsystem (v8+) — bygger og refaktorerer UI med @navikt/ds-react, tokens, layout-primitives, theming, versjon/migrering og tilgjengelighet, og oversetter Figma-design til Aksel-kode. Drevet av aksel-builder-skillen og Aksel MCP som fasit.
MAF Migration Agent
Use when migrating a .NET codebase to Microsoft Agent Framework (MAF) 1.3.0. Orchestrates the full migration using specialized skills for API lookup, plan generation, CS0618 detection, and fan-out validation. Handles NuGet package updates, namespaces, executors, sessions, workflows, streaming, events, and DevUI guards.