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/microsoft/apm/devx-uxnpx skills add microsoft/apm --skill devx-uxgit clone --depth 1 https://github.com/microsoft/apmWhat 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 | $0.00048 | $0.00293 |
| Opus 5 | $0.00024 | $0.00147 |
| Sonnet 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 2d 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.
- 2d ago First seen · 31 lines · 48 tokens per session scan A e66de2f844ee
devx-ux is a skill published in the GitHub repository microsoft/apm (3,668 stars, last pushed 2d ago), licensed MIT. It adds 48 tokens to every session and 293 once invoked, about $0.0002 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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