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 RadOrigin-LLC/RAD-Claude-Skills --skill chrome-ext-storagegit clone --depth 1 https://github.com/RadOrigin-LLC/RAD-Claude-SkillsWrote 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/radorigin-llc/rad-claude-skills/chrome-ext-storage)<a href="https://agentmods.dev/skills/radorigin-llc/rad-claude-skills/chrome-ext-storage"><img src="https://agentmods.dev/badge/skills/radorigin-llc/rad-claude-skills/chrome-ext-storage/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/radorigin-llc/rad-claude-skills/chrome-ext-storage"><img src="https://agentmods.dev/badge/skills/radorigin-llc/rad-claude-skills/chrome-ext-storage.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 | $0.00106 | $0.00922 |
| Opus 5 | $0.00053 | $0.00461 |
| Sonnet 5 | $0.00021 | $0.00184 |
| Haiku 4.5 | $0.00011 | $0.00092 |
Grade A, and why
chrome-ext-storage 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 11d 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 — 99 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Chrome Extension Storage
Chrome extensions have four storage areas plus IndexedDB. Each serves a different purpose with different lifecycles, quotas, and trade-offs. Choose based on data size, persistence needs, and cross-device requirements.
Storage Selection Guide
| Mechanism | Best For | Capacity | Lifecycle |
|---|---|---|---|
storage.session |
Hot state, temporary variables | 10 MB (in-memory) | Clears on browser close |
storage.local |
Device settings, cached data | 10 MB (expandable) | Persists until extension removed |
storage.sync |
User preferences across devices | 100 KB total | Syncs across Chrome instances |
storage.managed |
Enterprise-pushed config | Read-only | Set by IT admin policy |
| IndexedDB | Large datasets, binary data | ~80% disk | Persists until extension removed |
When to Use What
storage.session — In-memory state that must be fast but doesn't need to survive browser restart. Service worker volatile cache. Authentication tokens for the current session.
storage.local — Default choice for most extension data. Settings, cached API responses, user data that stays on one device. Use unlimitedStorage permission to remove the 10 MB cap.
storage.sync — Small user preferences that should follow the user across devices. Subject to strict quotas: 8 KB per item, 512 items max, 1,800 writes/hour.
IndexedDB — Large datasets, binary data (images, model weights, video metadata), or data requiring structured queries. No JSON serialization overhead (uses structured cloning). Can use ~80% of available disk.
Data That Must Never Be Stored
- Passwords and credentials in
storage.localorstorage.sync— these are NOT encrypted. Usestorage.sessionfor temporary auth tokens (clears on browser close). - Non-serializable objects —
chrome.storageonly accepts JSON-serializable types. NoDate,Set,Map,RegExp, or class instances.
Write-Through Cache Pattern
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.
- 11d ago First seen · 99 lines · 106 tokens per session scan A 4f46078db2e0
chrome-ext-storage is a skill published in the GitHub repository RadOrigin-LLC/RAD-Claude-Skills (5 stars, last pushed 25d ago), licensed Apache-2.0. It adds 106 tokens to every session and 922 once invoked, about $0.0005 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 2026-08-31.
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