AG-UI is an event-based protocol that lets AI agent backends communicate with user-facing applications. It standardizes agent events and inputs while supporting transports such as server-sent events, WebSockets, and webhooks. The catalogue add-ons help developers build integrations and applications around the protocol.
Borrowing it
Nothing to install: this file belongs to ag-ui-protocol/ag-ui. 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/ag-ui-protocol/ag-ui/main/.github/skills/agui-dotnet-transport/SKILL.mdgit clone --depth 1 https://github.com/ag-ui-protocol/ag-uiWrote 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/skills/ag-ui-protocol/ag-ui/agui-dotnet-transport)<a href="https://agentmods.dev/skills/ag-ui-protocol/ag-ui/agui-dotnet-transport"><img src="https://agentmods.dev/badge/skills/ag-ui-protocol/ag-ui/agui-dotnet-transport/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/skills/ag-ui-protocol/ag-ui/agui-dotnet-transport"><img src="https://agentmods.dev/badge/skills/ag-ui-protocol/ag-ui/agui-dotnet-transport.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00151 | $0.01592 |
| Opus 5 | $0.00076 | $0.00796 |
| Sonnet 5 | $0.00030 | $0.00318 |
| Haiku 4.5 | $0.00015 | $0.00159 |
Grade A, and why
agui-dotnet-transport 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 10d 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 — 109 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AG-UI .NET Transport & Encoding
Encodes the non-obvious design constraints of the AG-UI .NET transport layer, discovered while
building protobuf support. Apply when adding/changing an encoding or the negotiation that selects
one. Read references/wire-format.md before touching the protobuf codec or framing.
Transport architecture
One bidirectional abstraction, IAGUIEventStreamFormatter (in AGUI.Formatting), serves every
transport and both directions:
| Member | Role |
|---|---|
MediaType |
Advertised in client Accept and written as server Content-Type. Registration order = preference. |
CanRead(contentType) |
Client picks the decoder for the response Content-Type. |
ReadAsync(body, ct) |
Decode body → IAsyncEnumerable<BaseEvent>. |
WriteAsync(events, output, ct) |
Encode events → body. |
SseEventStreamFormatter (text/event-stream) is the always-available default;
ProtobufEventStreamFormatter (ProtobufEventStreamFormatter.ProtobufMediaType) is opt-in.
Client negotiation = DelegatingHandler + decode helper:
AGUIEventStreamHandler(public, inAGUI.Client) advertises every registered formatter'sMediaTypeinAccept, then inspects the responseContent-Type, finds the firstCanReadformatter, and records it on the request. The body is left untouched for lazy streaming.AGUIResponseExtensions.ReadAGUIEventStreamAsyncreads that recorded formatter (falling back to SSE) and decodes. The SDK ships noIHttpClientFactoryintegration: a caller that wants protobuf wires the handler into its ownHttpClient, and constructsAGUIChatClientfromAGUIChatClientOptions.
Server negotiation = AGUIResults.Events (samples AGUI.Samples.Shared): collects registered
IAGUIEventStreamFormatter services (+ built-in SSE), then picks protobuf only when its media
type is explicitly present in Accept with non-zero quality, else SSE for text/event-stream/
wildcard/absent, else 406. Mirrors preferredMediaTypes(accept, [proto]) in @ag-ui/encoder.
A server opts in by registering the formatter (for example,
services.AddSingleton<IAGUIEventStreamFormatter, ProtobufEventStreamFormatter>()).
What ships with it
1 file 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.
- 10d ago First seen · 109 lines · 151 tokens per session scan A b15dc5493047
agui-dotnet-transport is a skill published in the GitHub repository ag-ui-protocol/ag-ui (15,802 stars, last pushed today), licensed MIT. It adds 151 tokens to every session and 1,592 once invoked, about $0.0008 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.
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