extension-standards

extension-standards is a skill for Claude Code from saeedkolivand/ai-job-hunter-app. It costs 75 tokens per session (1,847 once invoked), scanned A, original, Apache-2.0.

Standards for building browser extensions and the software bridge they communicate with. It covers Chrome and Firefox extension rules, permissions, pairing authentication, the TypeScript-to-Rust message format, and store submission requirements.

In plain words
What is it for?
It guides work on browser-extension code, its local bridge, authentication, shared messages, and Chrome Web Store or Firefox AMO submissions.
Why use it?
It helps keep extension permissions and local communication restricted, while avoiding common browser-store policy and compatibility problems.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

Good fit It guides work on browser-extension code, its local bridge, authentication, shared messages, and Chrome Web Store or Firefox AMO submissions.

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Install with agentmods
npx agentmods add skills/saeedkolivand/ai-job-hunter-app/extension-standards
Install

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.

Any agent
npx skills add saeedkolivand/ai-job-hunter-app --skill extension-standards
Clone the repo
git clone --depth 1 https://github.com/saeedkolivand/ai-job-hunter-app

Made for: Claude Code.

Wrote 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.

agentmods badge for extension-standards

README.md
[![agentmods](https://agentmods.dev/badge/skills/saeedkolivand/ai-job-hunter-app/extension-standards/github.svg)](https://agentmods.dev/skills/saeedkolivand/ai-job-hunter-app/extension-standards)
Your own site
<a href="https://agentmods.dev/skills/saeedkolivand/ai-job-hunter-app/extension-standards"><img src="https://agentmods.dev/badge/skills/saeedkolivand/ai-job-hunter-app/extension-standards/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.

agentmods 80×15 button for extension-standards

Your own site · 80×15
<a href="https://agentmods.dev/skills/saeedkolivand/ai-job-hunter-app/extension-standards"><img src="https://agentmods.dev/badge/skills/saeedkolivand/ai-job-hunter-app/extension-standards.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 75 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,847 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00075 $0.01847
Opus 5 $0.00037 $0.00924
Sonnet 5 $0.00015 $0.00369
Haiku 4.5 $0.00007 $0.00185

Measured 9d ago against content hash 05713d4b0955, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

extension-standards 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.

.claude/skills/extension-standards/SKILL.md · 67 lines

How it starts

The opening of the file, as written. The whole thing — 67 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Extension + bridge standards

Standards for the browser extension and the desktop⇄extension bridge. Load with author-contract (authors) / token-efficiency (reviewers).

Architecture & paths

  • Extension (apps/extension/**) — MV3, published on Chrome Web Store and Firefox AMO. Content scripts on supported job boards → import the user-selected posting into the desktop app.
  • Bridge — the extension reaches the desktop app over a loopback-only WebSocket (127.0.0.1, a fixed port range) and Chrome Native Messaging (the native host relays frames verbatim). Server: apps/desktop/src-tauri/src/extension_bridge/** + commands/extension_bridge.rs.
  • Wire contractpackages/shared/src/ipc/extension-protocol-constants.ts (envelope + EXTENSION_MESSAGE_TYPES), its zod schema extension-protocol.ts, and the Rust msg constants in the bridge. A Rust↔TS parity test pins the message-type strings together.

Auth model (the security boundary)

  • The per-frame 256-bit pairing token (loopback only) is what authenticates. The origin allowlist (Chrome id / Firefox UUID-shape / native-host sentinel) is defense-in-depth only.
  • A connection is authorized/connected ONLY after a frame passes the token check — never on the WS handshake alone. On open the extension sends { type: "auth", token, reqId, payload: null }; the desktop replies an import.result with no error (= authorized) or { error: "unauthorized" } and closes the socket. A wrong token is never reported as connected. (This is the fix for the "any token looks authorized" bug — don't regress it.)
  • Never echo/confirm the token back; never log it. Token file is owner-only (0o600) on unix.

Protocol lockstep (don't let the two sides drift)

A new message type/field is added in the same change to: the TS EXTENSION_MESSAGE_TYPES constant, the TS zod ExtensionMessageTypeSchema, and the Rust msg module. The envelope shape (type / token / reqId / payload) stays identical on both sides. The parity + uniqueness tests must stay green.

Read the full file on GitHub · 67 lines

Changes

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.

  1. 9d ago First seen · 67 lines · 75 tokens per session scan A 05713d4b0955

Subscribe to this mod's changes

extension-standards is a skill published in the GitHub repository saeedkolivand/ai-job-hunter-app (55 stars, last pushed yesterday), licensed Apache-2.0. It adds 75 tokens to every session and 1,847 once invoked, about $0.0004 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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