Borrowing it
Nothing to install: this file belongs to peters/horizon. 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/peters/horizon/main/.github/instructions/azure-arm-client.instructions.mdgit clone --depth 1 https://github.com/peters/horizonWrote 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/instructions/peters/horizon/azure-arm-client)<a href="https://agentmods.dev/instructions/peters/horizon/azure-arm-client"><img src="https://agentmods.dev/badge/instructions/peters/horizon/azure-arm-client/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/instructions/peters/horizon/azure-arm-client"><img src="https://agentmods.dev/badge/instructions/peters/horizon/azure-arm-client.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 | $0.00267 | $0.00267 |
| Opus 5.5 | $0.00107 | $0.00107 |
| Sonnet 5.5 | $0.00053 | $0.00053 |
| Haiku 4.5 | $0.00027 | $0.00027 |
Grade A, and why
horizon azure-arm-client.instructions.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 3d 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
Azure ARM client boundary
Read docs/architecture/azure-arm-client.md before review.
- An ARM answer is untrusted data: status, headers, body and operation URL.
- Build each URL only from validated segments. A bad segment sends nothing.
- Keep the HTTPS-only, no-redirect and 30-second rules of the production agent.
Do not make
with_agentorwith_sleepspublic. - Read a success body with
RESPONSE_LIMITand a failure body withFAILURE_BODY_LIMIT. Never put body text in an error except as aReason. - Poll an operation URL only after
owns_operation_urlaccepts it. - A 409 is not definite and is never retried.
reconcilesends GET requests only and adopts a group only with the exact name andhorizon-operationtag.- Do not add credential sources, power actions, run commands or UI, CLI or MCP callers as part of this client.
azure/catalog.rsandazure/catalog/**are not part of this client. Review them withazure-price-catalog.instructions.md.
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.
- 3d ago First seen · 23 lines · 267 tokens per session scan A 35839fb6d6fe
horizon azure-arm-client.instructions.md is an instructions file published in the GitHub repository peters/horizon (722 stars, last pushed today), licensed MIT. It adds 267 tokens to every session, about $0.0011 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 2026-10-25.
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