APM is a package manager for AI-agent configuration, using a manifest to declare reusable instructions, skills, prompts, agents, hooks, plugins, and MCP components. Development teams use it to reproduce agent setups across projects and control their dependencies through policies and lockfiles, while the catalogue contains many of these agent components.
Borrowing it
Nothing to install: this file belongs to microsoft/apm. 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/microsoft/apm/main/.agents/skills/devx-ux/SKILL.mdgit clone --depth 1 https://github.com/microsoft/apmWrote 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/apm/devx-ux)<a href="https://agentmods.dev/skills/microsoft/apm/devx-ux"><img src="https://agentmods.dev/badge/skills/microsoft/apm/devx-ux/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/apm/devx-ux"><img src="https://agentmods.dev/badge/skills/microsoft/apm/devx-ux.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00048 | $0.00293 |
| Opus 5.5 | $0.00019 | $0.00117 |
| Sonnet 5.5 | $0.00010 | $0.00059 |
| Haiku 4.5 | $0.00005 | $0.00029 |
Grade A, and why
devx-ux 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 1mo 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.
What it actually says
Developer Tooling UX Skill
Developer Tooling UX expert persona
When to activate
- Changes to
src/apm_cli/cli.pyor any Click command definition - New / renamed commands, subcommands, flags, or positional args
- Help strings (
help=) and command docstrings - Error messages that the user reads (not internal exceptions)
apm init,apm install,apm run,apm compile,apm preview,apm list,apm depsflow changes- README quickstart edits that change the first-run path
Key rules
- Compare every flow against
npm/pip/cargo/ghmental models -- justify any deviation. - Default output is for humans;
--verboseis for agents. - Every error names the failure, the cause, and one next action.
- Defer logging-architecture decisions (
_rich_*, CommandLogger patterns) to the CLI Logging UX skill.
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.
- 1mo ago First seen · 31 lines · 48 tokens per session scan A e66de2f844ee
devx-ux is a skill published in the GitHub repository microsoft/apm (4,133 stars, last pushed yesterday), licensed MIT. It adds 48 tokens to every session and 293 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 2026-08-30.
Other skills, from other repositories
mermaid
Create, validate, and repair Mermaid.js diagrams. Use when generating flowcharts, sequence, class, ER, state, or Gantt diagrams, or any visualization.
design-system-reviewer
Review selected UI components, tokens, themes, and public component APIs against the project's actual design system, approved design, and consumer contracts.
frontend-ui-interaction-reviewer
Use when reviewing 2D UI controls, dialogs, drawers, forms, keyboard/focus behavior, loading/error recovery, empty states or task-oriented microcopy, including a bounded frontend-ui umbrella referral.
presentation-reviewer
Use when reviewing scroll-driven web presentation sections using GSAP ScrollTrigger, phone frames, DOM screen layers, or 3D screen textures for correctness and responsive behavior.
ui-reviewer
Review selected UI components and user flows for interaction, accessibility, responsive layout, visual hierarchy, state, and design contract defects using source and explicitly identified rendered evidence.
frontend-ui-color-reviewer
Use when reviewing assigned 2D UI palettes, semantic color tokens, themes, color spaces, gamut, contrast or color-dependent status and focus information.