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-wire-types/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-wire-types)<a href="https://agentmods.dev/skills/ag-ui-protocol/ag-ui/agui-dotnet-wire-types"><img src="https://agentmods.dev/badge/skills/ag-ui-protocol/ag-ui/agui-dotnet-wire-types/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-wire-types"><img src="https://agentmods.dev/badge/skills/ag-ui-protocol/ag-ui/agui-dotnet-wire-types.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 | $0.00174 | $0.02040 |
| Opus 5.5 | $0.00070 | $0.00816 |
| Sonnet 5.5 | $0.00035 | $0.00408 |
| Haiku 4.5 | $0.00017 | $0.00204 |
Grade A, and why
agui-dotnet-wire-types 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 2mo 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 — 119 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AG-UI .NET Wire/Protocol Types
Add or change a serialized protocol type in sdks/dotnet/src/AGUI.Abstractions/. These types are the JSON wire format. The TypeScript SDK is the reference — every type must round-trip against its JSON. Add // Keep in sync with sdks/typescript/packages/core/src/{events,types}.ts to each new type.
The 5 source packages are AGUI.Abstractions, AGUI.Formatting, AGUI.Protobuf, AGUI.Client, AGUI.Server. Wire types live in AGUI.Abstractions only. (sdks/dotnet/AGENTS.md is the canonical reference for the serialization rules and conventions.)
Run all commands from sdks/dotnet/.
Hard rules (forgetting any breaks the build or wire compat)
Every change to a polymorphic type touches four coordinated spots. Miss one and either the build fails or the type silently won't deserialize:
- The concrete class (
Events/,Messages/). - The discriminator constant (
AGUIEventTypes/AGUIRoles/AGUIInputContentTypes). - The source-gen context registration (
Serialization/AGUIJsonSerializerContext.cs). - The hand-written converter
ReadandWritecases (BaseEventJsonConverter/AGUIMessageJsonConverter/AGUIInputContentJsonConverter).
Plus: PublicAPI.Unshipped.txt (analyzer fails the build) and a round-trip test.
Recipe: new EVENT type
- Class in
Events/{Name}Event.cs,sealed, derivingBaseEvent. OverrideType => AGUIEventTypes.{Name}. - Constant in
Events/AGUIEventTypes.cs:public const string {Name} = "SCREAMING_SNAKE_CASE";. - Register
[JsonSerializable(typeof({Name}Event))]inAGUIJsonSerializerContext. - Converter in
BaseEventJsonConverter: add aReadswitch arm (AGUIEventTypes.{Name} => jsonElement.Deserialize(options.GetTypeInfo(typeof({Name}Event))) as {Name}Event) and aWritecase {Name}Event x: JsonSerializer.Serialize(writer, x, options.GetTypeInfo(typeof({Name}Event))); break;. - PublicAPI — add every new public member to
src/AGUI.Abstractions/PublicAPI.Unshipped.txt(format below). - Test in
tests/AGUI.Abstractions.UnitTests/{Name}EventTest.cs(JsonDocument assertions).
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.
- 2mo ago First seen · 119 lines · 174 tokens per session scan A 5f2358091d1b
agui-dotnet-wire-types is a skill published in the GitHub repository ag-ui-protocol/ag-ui (16,912 stars, last pushed today), licensed MIT. It adds 174 tokens to every session and 2,040 once invoked, about $0.0007 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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