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 skills add vinayaklatthe/microsoft-security-skills --skill windows-hellogit clone --depth 1 https://github.com/vinayaklatthe/microsoft-security-skillsWrote 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/vinayaklatthe/microsoft-security-skills/windows-hello)<a href="https://agentmods.dev/skills/vinayaklatthe/microsoft-security-skills/windows-hello"><img src="https://agentmods.dev/badge/skills/vinayaklatthe/microsoft-security-skills/windows-hello/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/vinayaklatthe/microsoft-security-skills/windows-hello"><img src="https://agentmods.dev/badge/skills/vinayaklatthe/microsoft-security-skills/windows-hello.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 | $0.00185 | $0.01874 |
| Opus 5 | $0.00093 | $0.00937 |
| Sonnet 5 | $0.00037 | $0.00375 |
| Haiku 4.5 | $0.00018 | $0.00187 |
Grade A, and why
windows-hello 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 9d 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 — 124 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Windows Hello for Business
Windows Hello for Business (WHfB) replaces passwords on Windows with a phishing-resistant 2-factor credential: a PIN or biometric (something you know/are) that unlocks a per-device asymmetric key (something you have, bound to TPM). The credential never leaves the device and is not replayable.
When to use
Eliminating password sign-in on Windows endpoints and meeting phishing-resistant MFA requirements for users on Windows. Use this skill to choose the trust model, satisfy prerequisites, and roll out provisioning.
Do not use this skill for FIDO2 keys on shared devices (entra-id), CA policy
(conditional-access-mfa), or device compliance (intune-device-mgmt).
Pick the trust model
WHfB has three trust models. The choice depends on whether on-prem AD SSO is needed and the state of the AD environment.
| Scenario | Trust model | Why |
|---|---|---|
| Cloud-only (Entra-joined, no on-prem AD) | Cloud-only (default) | No on-prem trust needed |
| Hybrid (Entra-joined / hybrid-joined, AD SSO needed) | Cloud Kerberos trust (recommended) | Simplest hybrid model; requires Entra Kerberos server objects |
| Hybrid, can't deploy Entra Kerberos | Key trust | Legacy; needs Windows Server 2016+ DCs + cert on each DC |
| Hybrid with strict cert-based environment | Certificate trust | Requires AD CS + NDES + Intune cert connector; most complex |
Rule of thumb: cloud Kerberos trust is the default for hybrid in 2026 unless there is a specific blocker (no Entra Connect Sync, regulated environment forbidding new auth models). Don't deploy key trust or certificate trust on new tenants - both are legacy.
Approach
- Verify prerequisites — Devices: Windows 10 1903+ / Windows 11; TPM 2.0 (TPM 1.2 in
limited cases). Users: Entra-joined or hybrid-joined; MFA registered; supported license.
For cloud Kerberos trust: deploy Entra Kerberos server objects in AD (
Set-AzureADKerberosServer). Verify:dsregcmd /statusshows AzureAdJoined = YES;Get-AzureADKerberosServerreturns one object per AD forest.
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.
- 9d ago First seen · 124 lines · 185 tokens per session scan A 6d67be1064b6
windows-hello is a skill published in the GitHub repository vinayaklatthe/microsoft-security-skills (173 stars, last pushed 2mo ago), licensed MIT. It adds 185 tokens to every session and 1,874 once invoked, about $0.0009 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 2026-09-03.
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