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 fanfan-de/anybox --skill expo-observegit clone --depth 1 https://github.com/fanfan-de/anyboxWrote 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/fanfan-de/anybox/expo-observe)<a href="https://agentmods.dev/skills/fanfan-de/anybox/expo-observe"><img src="https://agentmods.dev/badge/skills/fanfan-de/anybox/expo-observe/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/fanfan-de/anybox/expo-observe"><img src="https://agentmods.dev/badge/skills/fanfan-de/anybox/expo-observe.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 | $0.00129 | $0.00588 |
| Opus 5 | $0.00064 | $0.00294 |
| Sonnet 5 | $0.00026 | $0.00118 |
| Haiku 4.5 | $0.00013 | $0.00059 |
Grade A, and why
expo-observe 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 9d 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
EAS Observe
EAS Observe tracks startup, navigation, and custom-event performance from production Expo apps.
Source of truth: https://docs.expo.dev/eas/observe/ — always consult the canonical docs when API details matter, especially get-started, configuration, integrations, and the metrics reference. EAS Observe is evolving; this skill's references are written to stay accurate but may lag the docs.
Which reference to read
The three reference files in ./references/ cover the three things people typically need this skill for:
- Adding EAS Observe to a project →
./references/setup.md. Install, wrap the root layout (AppMetricsRooton SDK 55,ObserveRooton SDK 56+), callmarkInteractive()(global on SDK 55, via theuseObserve()hook on SDK 56+), and optional per-route navigation metrics through the Expo Router / React Navigation integrations. - Querying metrics from the terminal →
./references/queries.md. The fiveeas observe:*commands —metrics-summary,metrics,routes,events,versions— with flags, table layouts, JSON shapes, and common workflows. - Reading a dashboard or CLI output →
./references/metrics.md. Target thresholds per metric, what the TTIframeRate.*params mean, and diagnostic patterns for telling slow-but-smooth startup apart from main-thread contention or hard blocks.
Quick links to the docs
- Get started: https://docs.expo.dev/eas/observe/get-started/
- Dashboard guide: https://docs.expo.dev/eas/observe/dashboard/
- Metrics reference: https://docs.expo.dev/eas/observe/reference/metrics/
- Expo Router integration: https://docs.expo.dev/eas/observe/integrations/expo-router/
- React Navigation integration: https://docs.expo.dev/eas/observe/integrations/react-navigation/
- Configuration: https://docs.expo.dev/eas/observe/configuration/
What ships with it
3 files 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.
- 9d ago First seen · 30 lines · 129 tokens per session scan A 780843b9d2dd
expo-observe is a skill published in the GitHub repository fanfan-de/anybox (57 stars, last pushed 29d ago), licensed MIT. It adds 129 tokens to every session and 588 once invoked, about $0.0006 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 2026-09-03.
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