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 pproenca/dot-skills --skill chrome-extensiongit clone --depth 1 https://github.com/pproenca/dot-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/pproenca/dot-skills/chrome-extension)<a href="https://agentmods.dev/skills/pproenca/dot-skills/chrome-extension"><img src="https://agentmods.dev/badge/skills/pproenca/dot-skills/chrome-extension/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/pproenca/dot-skills/chrome-extension"><img src="https://agentmods.dev/badge/skills/pproenca/dot-skills/chrome-extension.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- 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 | $0.00048 | $0.02357 |
| Opus 5 | $0.00024 | $0.01179 |
| Sonnet 5 | $0.00010 | $0.00471 |
| Haiku 4.5 | $0.00005 | $0.00236 |
Grade A, and why
chrome-extension 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 5d 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 — 160 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Chrome Extension Best Practices
Comprehensive performance and code quality guide for Chrome Extensions (Manifest V3). Contains 67 rules across 12 categories, prioritized by impact to guide automated refactoring and code generation.
When to Apply
Reference these guidelines when:
- Writing new Chrome extension code
- Migrating from Manifest V2 to Manifest V3
- Optimizing service worker lifecycle and state management
- Implementing content scripts for page interaction
- Debugging performance issues in extensions
Rule Categories by Priority
| Priority | Category | Impact | Prefix |
|---|---|---|---|
| 1 | Service Worker Lifecycle | CRITICAL | sw- |
| 2 | Content Script Optimization | CRITICAL | content- |
| 3 | Message Passing Efficiency | HIGH | msg- |
| 4 | Storage Operations | HIGH | storage- |
| 5 | Network & Permissions | MEDIUM-HIGH | net- |
| 6 | Memory Management | MEDIUM | mem- |
| 7 | UI Performance | MEDIUM | ui- |
| 8 | API Usage Patterns | LOW-MEDIUM | api- |
| 9 | Code Style & Naming | MEDIUM | style- |
| 10 | Component Patterns | MEDIUM | comp- |
| 11 | Error Handling | HIGH | err- |
| 12 | Testing Patterns | MEDIUM | test- |
Quick Reference
1. Service Worker Lifecycle (CRITICAL)
sw-persist-state-storage- Persist state with chrome.storage instead of global variablessw-avoid-keepalive- Avoid artificial service worker keep-alive patternssw-use-alarms-api- Use chrome.alarms instead of setTimeout/setIntervalsw-return-true-async- Return true from message listeners for async responsessw-register-listeners-toplevel- Register event listeners at top levelsw-use-offscreen-for-dom- Use offscreen documents for DOM APIs
2. Content Script Optimization (CRITICAL)
What ships with it
60 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.
- AGENTS.md 9.6 KB
- assets/templates/_template.md 1.3 KB
- metadata.json 1.4 KB
- README.md 4.4 KB
- references/_sections.md 2.0 KB
- references/api-avoid-redundant-api-calls.md 2.0 KB
- references/api-handle-context-invalidated.md 2.4 KB
- references/api-query-tabs-efficiently.md 1.9 KB
- references/api-use-alarms-minperiod.md 2.0 KB
- references/api-use-declarative-content.md 2.1 KB
- references/api-use-promises-over-callbacks.md 2.0 KB
- references/comp-adapter-interface.md 2.7 KB
- references/comp-content-script-structure.md 2.9 KB
- references/comp-css-class-patterns.md 2.2 KB
- references/comp-manager-class.md 2.4 KB
- references/comp-type-guards.md 3.6 KB
- references/comp-ui-components.md 3.0 KB
- references/content-batch-dom-operations.md 2.3 KB
- references/content-minimize-script-size.md 1.8 KB
- references/content-programmatic-injection.md 2.0 KB
- references/content-use-document-idle.md 1.8 KB
- references/content-use-mutation-observer.md 2.4 KB
- references/content-use-specific-matches.md 1.6 KB
- references/err-context-invalidation.md 3.6 KB
- references/err-early-return.md 2.9 KB
- references/err-null-coalescing.md 2.7 KB
- references/err-promise-barrier.md 3.5 KB
- references/err-storage-operations.md 3.0 KB
- references/err-url-parsing.md 3.1 KB
- references/err-validation-pattern.md 3.9 KB
- references/mem-avoid-closure-leaks.md 2.1 KB
- references/mem-avoid-detached-dom.md 2.0 KB
- references/mem-cleanup-event-listeners.md 2.4 KB
- references/mem-clear-intervals-timeouts.md 2.1 KB
- references/mem-use-weak-collections.md 2.1 KB
- references/msg-avoid-broadcast-to-all-tabs.md 2.2 KB
- references/msg-check-lasterror.md 2.2 KB
- references/msg-debounce-frequent-events.md 2.0 KB
- references/msg-minimize-payload-size.md 2.1 KB
- references/msg-use-ports-for-frequent.md 1.9 KB
- references/net-limit-csp-modifications.md 2.0 KB
- references/net-request-minimal-permissions.md 1.8 KB
- references/net-use-activetab.md 2.0 KB
- references/net-use-declarativenetrequest.md 2.2 KB
- references/storage-avoid-storing-large-blobs.md 2.3 KB
- references/storage-batch-operations.md 2.2 KB
- references/storage-cache-frequently-accessed.md 2.2 KB
- references/storage-choose-correct-type.md 2.0 KB
- references/storage-use-session-for-temp.md 1.9 KB
- references/style-boolean-naming.md 1.6 KB
- references/style-cache-naming.md 1.5 KB
- references/style-constants.md 1.6 KB
- references/style-directory-structure.md 1.7 KB
- references/style-file-naming.md 1.0 KB
- references/style-function-naming.md 1.6 KB
- references/style-import-type.md 2.5 KB
- references/style-index-entry-points.md 1.5 KB
- references/style-message-enums.md 2.1 KB
- references/style-type-naming.md 1.7 KB
- references/sw-avoid-keepalive.md 1.8 KB
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.
- 5d ago First seen · 160 lines · 48 tokens per session scan A f721e44b2ee0
chrome-extension is a skill published in the GitHub repository pproenca/dot-skills (205 stars, last pushed 24d ago), licensed MIT. It adds 48 tokens to every session and 2,357 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 2026-09-03.
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