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 agentmods add skills/the-biomechanist/windows-dev-agent/win-setupnpx skills add The-Biomechanist/Windows-Dev-Agent --skill win-setupgit clone --depth 1 https://github.com/The-Biomechanist/Windows-Dev-AgentWrote 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/the-biomechanist/windows-dev-agent/win-setup)<a href="https://agentmods.dev/skills/the-biomechanist/windows-dev-agent/win-setup"><img src="https://agentmods.dev/badge/skills/the-biomechanist/windows-dev-agent/win-setup.svg" alt="Measured on agentmods" 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 | $0.00028 | $0.00467 |
| Opus 5 | $0.00014 | $0.00234 |
| Sonnet 5 | $0.00006 | $0.00093 |
| Haiku 4.5 | $0.00003 | $0.00047 |
Grade A, and why
win-setup 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 4d 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 — 25 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Windows Setup
Procedure
- Inspect current state first. Use
env_inspectand project requirements. Preservenull/unknown probe state; do not reinstall a tool merely because discovery failed to establish it. - Locate the earliest missing or broken prerequisite. Distinguish runtime absence, unknown probe state, PATH/session propagation, version mismatch, package-manager failure, project dependency failure, and Windows feature state.
- Choose the native repair. Prefer the smallest Windows-owned change that repairs that prerequisite. Do not turn a local project problem into a machine-wide setup rewrite.
- For system packages, resolve identity before install. Preserve an exact ID supplied by the user or authoritative project/config state. Otherwise call
package_search, inspect the candidates, and callpackage_installwithexecute: falsefor the resolved ID before requesting execution. - For Windows optional features, use an explicitly approved PowerShell action only when the feature is actually required. WSL, Windows Sandbox, and Hyper-V are OS features, not ordinary package installs. If feature discovery is unknown because the current process could not establish it, resolve that fact before treating the feature as absent.
- For project dependencies, switch to the project's own package manager only after the required runtime/toolchain is established. Preserve lockfiles and project conventions. Project-code/build/test execution follows the active host's ordinary permission path.
- Verify the repaired joint with fresh state. Prefer the narrow version, availability, build, or project check that can establish the requested post-state. If full
env_inspectis the right witness after a host mutation, useforce_refresh: true.
Rules
- Never use
--silentto bypass license or installer interaction. - Resolve an exact package identity before installation; do not guess WinGet IDs.
- Do not treat a successful installer exit as proof that the current shell sees the new PATH.
- Do not mutate unrelated runtimes or package-manager state while repairing one dependency.
- If elevation or restart is required, state that post-state explicitly rather than claiming completion early.
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.
- 4d ago First seen · 25 lines · 28 tokens per session scan A a79e18f93b3b
win-setup is a skill published in the GitHub repository The-Biomechanist/Windows-Dev-Agent (0 stars, last pushed 4d ago), licensed MIT. It adds 28 tokens to every session and 467 once invoked, about $0.0001 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 2026-08-31.
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