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 rodydavis/signals.dart --skill signals-preact-dartgit clone --depth 1 https://github.com/rodydavis/signals.dartWrote 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/rodydavis/signals.dart/signals-preact-dart)<a href="https://agentmods.dev/skills/rodydavis/signals.dart/signals-preact-dart"><img src="https://agentmods.dev/badge/skills/rodydavis/signals.dart/signals-preact-dart/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/rodydavis/signals.dart/signals-preact-dart"><img src="https://agentmods.dev/badge/skills/rodydavis/signals.dart/signals-preact-dart.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 | $0.00022 | $0.00943 |
| Opus 5.5 | $0.00009 | $0.00377 |
| Sonnet 5.5 | $0.00004 | $0.00189 |
| Haiku 4.5 | $0.00002 | $0.00094 |
Grade A, and why
signals-preact-dart 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.
How it starts
The opening of the file, as written. The whole thing — 124 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Preact Signals in Dart
This skill covers the core reactive programming primitives and implementation patterns of the preact_signals package.
Related Documentation & Items
| Related File | Description |
|---|---|
| signal.md | Standard writeable reactive state primitive containing value accessors, mutation mechanics, and basic custom options. |
| computed.md | Lazy, memoized read-only derived state signal tracking reactive dependencies dynamically. |
| effect.md | Synchronous observer managing active subscription loops, dynamic dependency updates, and lifecycle teardown. |
| readonly.md | Read-only signal views ensuring unidirectional data access flows. |
| batch.md | Transactional state mutation blocks optimizing reactive computations and preventing rendering/recompute churn. |
Core Primitives Quick Start Guide
The signals library exposes five core functions which are the building blocks to model any reactive business logic.
1. signal(initialValue)
Creates a new mutable signal container. You read a signal's value or subscribe to updates by accessing .value.
final counter = signal(0);
print(counter.value); // 0
counter.value = 1; // Mutates value and schedules dependent updates
.peek()
Reads a signal's current value without subscribing to its mutations.
final counter = signal(0);
final logCount = signal(0);
effect(() {
print(counter.value);
// Read using peek to avoid subscribing/triggering loop
logCount.value = logCount.peek() + 1;
});
2. untracked(fn)
Executes a callback that reads signals without subscribing to any of them.
final counter = signal(0);
final count = signal(0);
effect(() {
print(counter.value);
count.value = untracked(() => count.value + 1);
});
3. computed(fn)
Combines the values of multiple signals into a lazy, memoized derived signal.
final first = signal('John');
final last = signal('Doe');
final fullName = computed(() => '${first.value} ${last.value}');
print(fullName.value); // John Doe
What ships with it
7 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.
- 1mo ago First seen · 124 lines · 22 tokens per session scan A 130ee1868fbe
signals-preact-dart is a skill published in the GitHub repository rodydavis/signals.dart (824 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 22 tokens to every session and 943 once invoked, about $0.0001 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.
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