HVE Core is a collection of agents, prompts, coding instructions, and skills for building repeatable software-development workflows with GitHub Copilot. It is intended for individuals and teams that want structured AI-assisted research, planning, implementation, and review, while the catalogue entries provide many of its reusable workflow components.
Borrowing it
Nothing to install: this file belongs to microsoft/hve-core. 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/microsoft/hve-core/main/.github/instructions/skill-security-model.instructions.mdgit clone --depth 1 https://github.com/microsoft/hve-coreWrote 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/microsoft/hve-core/skill-security-model)<a href="https://agentmods.dev/instructions/microsoft/hve-core/skill-security-model"><img src="https://agentmods.dev/badge/instructions/microsoft/hve-core/skill-security-model/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/microsoft/hve-core/skill-security-model"><img src="https://agentmods.dev/badge/instructions/microsoft/hve-core/skill-security-model.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 | $0.01685 | $0.01685 |
| Opus 5.5 | $0.00674 | $0.00674 |
| Sonnet 5.5 | $0.00337 | $0.00337 |
| Haiku 4.5 | $0.00169 | $0.00169 |
Grade A, and why
hve-core skill-security-model.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 21d 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 — 74 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Security Model Conventions
A skill whose shipped scripts meet any trigger in When a Model Is Required carries a SECURITY.md STRIDE threat model next to its SKILL.md. These models mirror the repo-wide model at docs/security/security-model.md and are registered in its Skill Security Models section, which is the authoritative index for locating any of them. When that index is unavailable, say so and locate models by looking for a SECURITY.md beside the skill's own SKILL.md rather than assuming a skill has no model. The canonical exemplars are the SECURITY.md files bundled with the mural, jira, and gitlab skills; resolve them by skill name rather than by a package path, which is not stable across repository, plugin, and extension layouts. When none of them is available, follow the Required Structure below, which is self-contained. The fill-in template is docs/templates/skill-security-model-template.md; when it is unavailable, build the document from the Required Structure section instead of improvising a layout.
When a Model Is Required
Evaluate every shipped script in the skill. Test files are excluded: files under a tests/ directory and *.test.* or *.spec.* files.
A skill requires a SECURITY.md when any of its shipped scripts:
- Makes network requests.
- Reads, stores, or sends credentials, tokens, or keys.
- Parses files, media, or responses that can come from outside the operator's control, such as downloads, customer-supplied data, or content from another repository.
- Writes outside
.copilot-tracking/, stdout, or the skill's own declared output location, for example into a user's repository, global settings, or system paths. - Runs an external program with arguments or input derived from any of the conditions above.
A skill is exempt when none of the triggers apply. Typical exempt scripts only read the local repository, run fixed-argument programs such as git or pwsh, and write to stdout or .copilot-tracking/.
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.
- 21d ago Changed · +4 lines · +127 tokens per session b977dc8ad1fa
- 23d ago Changed · +32 lines · +531 tokens per session 4a64d775edf5
- 1mo ago First seen · 38 lines · 1,027 tokens per session scan A 0d524db7abbc
hve-core skill-security-model.instructions.md is an instructions file published in the GitHub repository microsoft/hve-core (1,580 stars, last pushed yesterday), licensed MIT. It adds 1,685 tokens to every session, about $0.0067 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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AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
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Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deno copilot-instructions.md
Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.