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 lvcoi/solidJSkills --skill solid-reactivity-core-expertgit clone --depth 1 https://github.com/lvcoi/solidJSkillsWrote 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/lvcoi/solidjskills/solid-reactivity-core-expert)<a href="https://agentmods.dev/skills/lvcoi/solidjskills/solid-reactivity-core-expert"><img src="https://agentmods.dev/badge/skills/lvcoi/solidjskills/solid-reactivity-core-expert/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/lvcoi/solidjskills/solid-reactivity-core-expert"><img src="https://agentmods.dev/badge/skills/lvcoi/solidjskills/solid-reactivity-core-expert.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00039 | $0.00568 |
| Opus 5.5 | $0.00016 | $0.00227 |
| Sonnet 5.5 | $0.00008 | $0.00114 |
| Haiku 4.5 | $0.00004 | $0.00057 |
Grade A, and why
solid-reactivity-core-expert 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 2mo 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 — 66 lines — stays where its author put it; the contents beside it link to each section on GitHub.
solid-reactivity-core-expert
Trigger
Use for reactivity correctness decisions involving createSignal, createMemo, createEffect, createResource, batch, untrack.
Required Inputs
- State ownership and mutation boundaries.
- Current or planned derivations.
- Side effects and async behavior.
Workflow
- Classify each reactive operation as state, derivation, side effect, or async boundary.
- Replace effect-driven derivations with memo/signal derivations when possible.
- Confirm dependency tracking is minimal and explicit.
- Provide handoff notes to macro skill for implementation/refactor/review.
Failure Modes
- Unknown state ownership: require explicit owner boundary.
- Effect loops detected: mark as blocking issue and propose memo-driven rewrite.
- Async without loading/error semantics: add resource state matrix.
Output Contract
Return DomainGuidanceOutput with decisions, handoff steps, validation commands, and citations containing doc_id.
Validation
node tools/scripts/validate-skills.mjs --skill solid-reactivity-core-expertnode tools/scripts/validate-solid-corpus.mjs
Key Corpus References
Use these doc_id values with the read_corpus_doc MCP tool:
solid-core.reference.basic-reactivity.create-signal— signal creation and update semanticssolid-core.reference.basic-reactivity.create-memo— derivation caching rulessolid-core.reference.basic-reactivity.create-effect— side-effect tracking and cleanupsolid-core.reference.basic-reactivity.create-resource— async reactive data loadingsolid-core.reference.reactive-utilities.batch— grouped signal updates
References
../../references/solidjs/reactivity-core.md../../references/solidjs-normalized/manifest.jsonl../../references/solidjs-normalized/docs/reference/basic-reactivity/create-signal.md../../references/solidjs-normalized/docs/reference/basic-reactivity/create-memo.md../../references/solidjs-normalized/docs/reference/basic-reactivity/create-effect.md
What ships with it
1 file 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.
- 2mo ago First seen · 66 lines · 39 tokens per session scan A 4fc09782f2ae
solid-reactivity-core-expert is a skill published in the GitHub repository lvcoi/solidJSkills (9 stars, last pushed 8mo ago), licensed MIT. It adds 39 tokens to every session and 568 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 2026-08-31.
solid-reactivity-core-expert compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| solid-reactivity-core-expertlvcoi/solidJSkills | Skill | 9 | 8mo ago | MIT | A | 39 | Claude Code, Codex |
| imagegenopenai/codex | Skill | 133k | yesterday | Apache-2.0 | A | 113 | Codex |
| playwright-climicrosoft/playwright | Skill | 99k | yesterday | Apache-2.0 | A | 19 | Claude Code |
| local-ai-agentsmicrosoft/ai-agents-for-beginners | Skill | 79k | 4d ago | MIT | A | 200 | Claude Code, Codex |
| systematic-debuggingobra/superpowers | Skill | 313k | 3d ago | MIT | A | 21 | Claude Code |
| next-cache-components-adoptionvercel/next.js | Skill | 143k | today | MIT | A | 95 | Claude Code |
| next-partial-prefetching-adoptionvercel/next.js | Skill | 143k | today | MIT | A | 103 | Claude Code |