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 defender-for-office-365git 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/defender-for-office-365)<a href="https://agentmods.dev/skills/vinayaklatthe/microsoft-security-skills/defender-for-office-365"><img src="https://agentmods.dev/badge/skills/vinayaklatthe/microsoft-security-skills/defender-for-office-365/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/defender-for-office-365"><img src="https://agentmods.dev/badge/skills/vinayaklatthe/microsoft-security-skills/defender-for-office-365.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 | $0.00221 | $0.02388 |
| Opus 5 | $0.00111 | $0.01194 |
| Sonnet 5 | $0.00044 | $0.00478 |
| Haiku 4.5 | $0.00022 | $0.00239 |
Grade A, and why
defender-for-office-365 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 12d 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 — 150 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Microsoft Defender for Office 365
Microsoft Defender for Office 365 (MDO) protects email and collaboration workloads against phishing, malware, spoofing, and business email compromise. It provides preset policies, detonation (Safe Attachments), time-of-click URL protection (Safe Links), post-delivery detection and hunting (Threat Explorer + AIR), and attack simulation training.
When to use
Securing Exchange Online mail flow and Microsoft 365 collaboration (Teams, SharePoint, OneDrive). Use this skill for plan/preset decisions, control configuration, drift detection, and SOC operations on email incidents.
Do not use this skill for endpoint protection (defender-for-endpoint), broader
cross-workload investigation (defender-xdr), or SharePoint oversharing before Copilot
rollout (purview-copilot-oversharing).
Pick the plan, then the preset
| If you need... | Plan / SKU | Notes |
|---|---|---|
| Safe Links, Safe Attachments, anti-phish, anti-spam, anti-malware | MDO Plan 1 | Bundled with M365 Business Premium and E3 add-on |
| Threat Explorer, Real-time detections, AIR, attack simulation training, automated investigation | MDO Plan 2 | Bundled with M365 E5 / MDO P2 |
| Cross-tenant secure collaboration (B2B/B2C with MDO) | MDO P1 or P2 | Apply preset to guest senders too |
| Posture | Preset to apply | Who it fits |
|---|---|---|
| Default healthy baseline, low admin overhead | Standard preset | Most enterprises - apply to all users |
| High-target, regulated, or executive-heavy estate | Strict preset | Tier-0 admins, finance, exec mailboxes |
| Custom carve-out (e.g. vendor with broken SPF) | Custom policy with priority above preset | Use sparingly - documents drift risk |
Rule of thumb: apply Standard preset to all users as the floor, Strict preset to high-risk groups (executives, finance, IT admins, legal) as the ceiling. Custom policies only where presets genuinely don't fit - every custom policy is a future drift source.
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.
- 12d ago First seen · 150 lines · 221 tokens per session scan A d1d3b41396fb
defender-for-office-365 is a skill published in the GitHub repository vinayaklatthe/microsoft-security-skills (173 stars, last pushed 2mo ago), licensed MIT. It adds 221 tokens to every session and 2,388 once invoked, about $0.0011 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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