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 instructions/stephbu/csharp-dns-server/agents-mdgit clone --depth 1 https://github.com/stephbu/csharp-dns-serverWhat 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 | $0.01305 | $0.01305 |
| Opus 5 | $0.00652 | $0.00652 |
| Sonnet 5 | $0.00261 | $0.00261 |
| Haiku 4.5 | $0.00130 | $0.00130 |
Grade A, and why
csharp-dns-server AGENTS.md 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 — 94 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS GUIDE
Scope: assistants may edit code, tests, and documentation in this repository. Infrastructure/deployment assets remain off-limits unless explicitly approved.
1. Mission
- Maintain and extend the
csharp-dns-serverso it becomes a production-ready DNS service with rich testing, observability, and zone-provider capabilities. - Follow the roadmap in
docs/product_requirements.md, respect the priority tiers indocs/priorities.md(P0 reliability/protocol accuracy, P1 security & maintenance, P2 features), and focus on open GitHub issues aligned with those tiers. - Reference the prioritized backlog in
docs/task_list.mdwhen picking up work to stay aligned with near-term goals.
2. Repository Orientation
| Project | Purpose | Notes |
|---|---|---|
Dns/ |
Core library implementing DNS protocol, server loop, zone providers, HTTP status surface. | Entry point: Dns/Program.cs. Zone providers under Dns/ZoneProvider. |
dns-cli/ |
Console host that runs the DNS server for local testing. | Mirrors Dns/appsettings.json. |
dnstest/ |
xUnit suite covering protocol/utility components. | Expand here before adding new test assemblies. |
docs/ |
Specs, PRD and future design docs. | docs/product_requirements.md drives priorities. |
Key classes & files:
Dns/Program.cs: wiring for DI/config/servers viaMicrosoft.Extensions.DependencyInjection.Dns/DnsServer.cs: UDP DNS loop and upstream forwarding.Dns/SmartZoneResolver.cs: in-memory zone cache & round-robin dispenser.Dns/HttpServer.cs: embedded status/diagnostics surface.Dns/ZoneProvider/**: implementations (CSV, IP probes, BIND placeholder).
3. Getting Started
# restore & build
dotnet build csharp-dns-server.sln
# run tests
dotnet test csharp-dns-server.sln
# run server (localhost)
cd dns-cli
dotnet run -- ./appsettings.json
Gotchas:
- UDP port 53 may be taken by Docker/ICS on Windows; change listener port in
appsettings.json. Dns/appsettings.jsonis copied to output; edit with care when adding samples.- Zone providers may depend on local files (CSV) or ping-able IPs—mock or isolate tests accordingly.
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 · 94 lines · 1,305 tokens per session scan A b973f0968126
csharp-dns-server AGENTS.md is an instructions file published in the GitHub repository stephbu/csharp-dns-server (122 stars, last pushed 9mo ago), licensed MIT. It adds 1,305 tokens to every session, about $0.0065 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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