Borrowing it
Nothing to install: this file belongs to managedcode/PrompterOne. 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/managedcode/PrompterOne/main/.codex/skills/dotnet-microsoft-agent-framework/references/official-docs/tutorials/agents/middleware.mdgit clone --depth 1 https://github.com/managedcode/PrompterOneWrote 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/agents/managedcode/prompterone/middleware)<a href="https://agentmods.dev/agents/managedcode/prompterone/middleware"><img src="https://agentmods.dev/badge/agents/managedcode/prompterone/middleware/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/agents/managedcode/prompterone/middleware"><img src="https://agentmods.dev/badge/agents/managedcode/prompterone/middleware.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 | $0.00017 | $0.00381 |
| Opus 5.5 | $0.00007 | $0.00152 |
| Sonnet 5.5 | $0.00003 | $0.00076 |
| Haiku 4.5 | $0.00002 | $0.00038 |
Grade A, and why
middleware 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.
What it actually says
Adding middleware to agents
[!NOTE] The live Learn URL for this old tutorial now resolves to the same canonical middleware page as
user-guide/agents/agent-middleware.md:https://learn.microsoft.com/agent-framework/agents/middleware/Keep this local file only as a compatibility alias for existing references inside the skill catalog.
Learn how to add middleware to your agents in a few simple steps. Middleware allows you to intercept and modify agent interactions for logging, security, and other cross-cutting concerns.
::: zone pivot="programming-language-csharp"
For the current C# walkthrough, use references/official-docs/user-guide/agents/agent-middleware.md.
Current tutorial-level takeaways
- Register agent-run middleware through
AsBuilder().Use(...). - Prefer supplying both
runFuncandrunStreamingFunc; useUse(sharedFunc: ...)only for input inspection that should not rewrite output. - Current run middleware examples use
AgentSession? sessioninstead ofAgentThread? thread. - Function middleware is still the right place for approvals, allow/deny policy, and risky-tool interception.
- Current official C# samples use
DefaultAzureCredentialand explicitly warn against carrying that default into production unchanged.
::: zone-end ::: zone pivot="programming-language-python"
The live alias now resolves to the canonical middleware article. Use the canonical live docs for current Python examples.
::: zone-end
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 · 40 lines · 17 tokens per session scan A aabf806c2177
middleware is an agent published in the GitHub repository managedcode/PrompterOne (45 stars, last pushed 5mo ago), licensed MIT. It adds 17 tokens to every session and 381 once invoked, about $0.0001 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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