Borrowing it
Nothing to install: this file belongs to SCStelz/security-investigator. 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/SCStelz/security-investigator/main/.github/skills/ai-agent-posture/SKILL.mdgit clone --depth 1 https://github.com/SCStelz/security-investigatorWrote 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/scstelz/security-investigator/ai-agent-posture)<a href="https://agentmods.dev/skills/scstelz/security-investigator/ai-agent-posture"><img src="https://agentmods.dev/badge/skills/scstelz/security-investigator/ai-agent-posture/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/scstelz/security-investigator/ai-agent-posture"><img src="https://agentmods.dev/badge/skills/scstelz/security-investigator/ai-agent-posture.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Excessive Agency · line 500 Skill grants unrestricted tool access without appropriate constraints. An agent with unfettered tool access can perform arbitrary actions including file modification, network requests, and code execution.Fix: Restrict tool access to only the tools required for the skill's stated purpose. Use an explicit allowlist rather than granting blanket access.
- medium Agent Snooping · line 1256 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
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 | $0.00222 | $0.19901 |
| Opus 5 | $0.00111 | $0.09950 |
| Sonnet 5 | $0.00044 | $0.03980 |
| Haiku 4.5 | $0.00022 | $0.01990 |
Grade A, and why
ai-agent-posture 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 — 1,262 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AI Agent Security Posture — Instructions
Purpose
This skill audits the security posture of AI agents (Copilot Studio, Microsoft 365 Copilot / Agent Builder, Microsoft Foundry, and third-party platforms) across your organization using the AgentsInfo table in Microsoft Defender XDR Advanced Hunting.
🔄 Table migration (AIAgentsInfo → AgentsInfo): This skill was migrated from the deprecated
AIAgentsInfotable to the unified multi-platformAgentsInfotable.AIAgentsInforemains queryable until July 1, 2026, but it is Copilot Studio-only and uses a different schema. All queries in this skill targetAgentsInfo. The new table is a different data model, not a rename — see Table Schema Reference and Known Pitfalls for the differences that shaped these queries.
AI agents are autonomous or semi-autonomous applications that can access organizational data, send emails, call external APIs, and use MCP tools. Misconfigured agents — missing authentication, overly broad access, AI-controlled email sending, hard-coded credentials — represent a growing attack surface. This skill systematically evaluates that surface.
What this skill covers:
| Domain | Key Questions Answered |
|---|---|
| 🔍 Agent Inventory | How many agents exist? What's their status, platform, environment? |
| 🔐 Access Posture | Which agents are broadly accessible (allowForAllUsers)? How are agents shared (appType: lob/shared)? |
| 🛠️ Tools & MCP | Which agents have MCP tools? What operations can they perform? |
| 📚 Knowledge Sources | What data sources are agents connected to? |
| 📧 XPIA Email Risk | Which agents can send email (data exfil precondition)? |
| 🔑 Credential Exposure | Are credentials hard-coded in agent instructions or connector metadata? |
| 🌐 External Endpoint Risk | What external hosts do agent connectors reach? Any insecure schemes or non-standard ports? |
| 👥 Creator Governance | Who creates agents? Is there naming hygiene? Abandoned agents? |
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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 · 1,262 lines · 222 tokens per session scan A 5017394d3b30
ai-agent-posture is a skill published in the GitHub repository SCStelz/security-investigator (245 stars, last pushed 4d ago), licensed MIT. It adds 222 tokens to every session and 19,901 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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