microsoft/win-dev-skills is a collection of AI-agent instructions and tools for creating native Windows applications with WinUI 3 and the Windows App SDK. Windows developers use it to guide agents through app development tasks from scaffolding and design to testing, packaging, and release. The catalogue entries are its agents, skills, and plugin components.
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 microsoft/win-dev-skills --skill windbg-user-virtual-memory-exhaustiongit clone --depth 1 https://github.com/microsoft/win-dev-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/microsoft/win-dev-skills/windbg-user-virtual-memory-exhaustion)<a href="https://agentmods.dev/skills/microsoft/win-dev-skills/windbg-user-virtual-memory-exhaustion"><img src="https://agentmods.dev/badge/skills/microsoft/win-dev-skills/windbg-user-virtual-memory-exhaustion/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/microsoft/win-dev-skills/windbg-user-virtual-memory-exhaustion"><img src="https://agentmods.dev/badge/skills/microsoft/win-dev-skills/windbg-user-virtual-memory-exhaustion.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 | $0.00054 | $0.01085 |
| Opus 5.5 | $0.00022 | $0.00434 |
| Sonnet 5.5 | $0.00011 | $0.00217 |
| Haiku 4.5 | $0.00005 | $0.00109 |
Grade A, and why
windbg-user-virtual-memory-exhaustion 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 8d 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 — 114 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Virtual Memory Exhaustion
Load windbg-diagnostic-method first if it is not already loaded in this
conversation, and apply it throughout for evidence ranking, hypothesis testing,
confidence calibration, independent review, and report validation. This skill
adds the bug-family-specific commands and evidence requirements.
Detection
Investigate E_OUTOFMEMORY (0x8007000E), STATUS_NO_MEMORY (0xC0000017),
bad_alloc, or failed heap/virtual allocations in an application, service, or
user-mode driver host (including UMDF). Record the actual API, requested
size/alignment, architecture, flags, and error. Free physical RAM does not rule
out insufficient virtual address space, commit pressure, or applicable limits.
Workflow
1. Examine the process VA map
!address -summary
!address
!heap -s
Compare available regions with the attempted allocation's contiguous range and alignment requirements. Distinguish reserved, committed, free, image, mapped, stack, and heap ranges. A large reservation consumes VA without committing its entire range. Heap internals may require more than the user's requested bytes.
Report unavailable pages/map data rather than inferring completeness from a limited dump.
2. Separate pressure mechanisms
| Mechanism | Evidence needed |
|---|---|
| VA exhaustion | Process address range/architecture and little usable free VA |
| Fragmentation | Free space exists, but no suitable contiguous/aligned region |
| System commit pressure | Commit usage/limit near the failure, not just free RAM |
| Process/job memory limit | Actual configured limit and relevant usage/accounting |
| Allocation policy/API failure | API-specific constraints, flags, or allocator policy |
Use contemporaneous system memory counters or an appropriate live/kernel
session for system commit data. A process PEB is not a documented
MaximumCommit source. A process's committed bytes alone do not establish a
system-wide or job limit.
For 32-bit targets inspect /LARGEADDRESSAWARE and the host architecture;
2 GB versus up to 4 GB depends on those settings. Verify current documented
limits for the target Windows version and architecture instead of applying
one 64-bit limit to every system.
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.
- 8d ago First seen · 114 lines · 54 tokens per session scan A 281202874f7a
windbg-user-virtual-memory-exhaustion is a skill published in the GitHub repository microsoft/win-dev-skills (472 stars, last pushed 2d ago), licensed MIT. It adds 54 tokens to every session and 1,085 once invoked, about $0.0002 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 2026-10-08.
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