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cheliped-browser

cheliped-browser is a skill for Claude Code, Codex from tykimos/cheliped-skills. It costs 162 tokens per session (2,204 once invoked), scanned A, original, MIT.

A browser-control runtime that lets an agent open web pages, read their content, fill fields, click controls, and inspect the page through Chrome.

In plain words
What is it for?
Use it to browse sites, extract text or links, submit forms, and test web interactions.
Why use it?
It provides a repeatable way to interact with websites and report each browser action and its result.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

not rated 62repo 4mo ago A scan 162 tokens original MIT

Good fit Use it to browse sites, extract text or links, submit forms, and test web interactions.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/tykimos/cheliped-skills/browser
View source ↗ tykimos/cheliped-skills
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 tykimos/cheliped-skills --skill browser
Clone the repo
git clone --depth 1 https://github.com/tykimos/cheliped-skills

Made for: Claude Code, Codex.

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 cheliped-browser

README.md
[![agentmods](https://agentmods.dev/badge/skills/tykimos/cheliped-skills/browser/github.svg)](https://agentmods.dev/skills/tykimos/cheliped-skills/browser)
Your own site
<a href="https://agentmods.dev/skills/tykimos/cheliped-skills/browser"><img src="https://agentmods.dev/badge/skills/tykimos/cheliped-skills/browser/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 cheliped-browser

Your own site · 80×15
<a href="https://agentmods.dev/skills/tykimos/cheliped-skills/browser"><img src="https://agentmods.dev/badge/skills/tykimos/cheliped-skills/browser.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 162 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,204 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 $0.00162 $0.02204
Opus 5.5 $0.00065 $0.00882
Sonnet 5.5 $0.00032 $0.00441
Haiku 4.5 $0.00016 $0.00220

Measured 2mo ago against content hash 497d12de4f04, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

cheliped-browser 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.

The scan reads SKILL.md. This mod also ships 42 executable files (scripts/benchmark-challenge.mjs, scripts/benchmark-compare.mjs, scripts/benchmark-limitations.mjs, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

browser/SKILL.md · 161 lines

How it starts

The opening of the file, as written. The whole thing — 161 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Agent Browser Runtime

Control Chrome via CDP. Extract Agent DOM — a compressed DOM where every interactive element gets a numeric agentId.

Setup

Run once before first use:

cd scripts && npm install && npm run build

Core Workflow: Observe-Act Loop

# 1. Navigate and observe
node scripts/cheliped-cli.mjs '[{"cmd":"goto","args":["https://example.com"]},{"cmd":"observe"}]'

# 2. Use agentId from observe output to interact
node scripts/cheliped-cli.mjs '[{"cmd":"fill","args":["3","search term"]},{"cmd":"click","args":["4"]},{"cmd":"observe"}]'

First call auto-launches Chrome and saves session. Subsequent calls reconnect (the reconnect is identity-checked against the browser's DevTools token, so a crashed-and-reused PID/port can't be mistaken for the original Chrome). Call close when done.

Output Envelope

Output is always a JSON array, one envelope per command, compact by default:

[{ "cmd": "goto",  "ok": true,  "result": { "url": "...", "title": "..." } },
 { "cmd": "click", "ok": false, "error": { "code": "E_STALE_ID", "message": "..." } }]

By default each command runs even if a prior one fails (per-command isolation). Error code is one of E_BAD_ARG, E_STALE_ID, E_TIMEOUT, E_BROWSER, E_UNKNOWN.

CLI flags (before the JSON argument)

Flag Effect
--session <name> named session (concurrent browsers)
--no-headless / --headed run Chrome with a visible window
--pretty indent JSON output (default is compact, fewer tokens)
--stop-on-error fail-fast: halt the batch on the first error
--chrome-path <path> explicit Chrome/Chromium binary (or CHROME_PATH env)
--timeout <ms> launch/connect timeout
--max-links <n> / --max-texts <n> / --max-text-length <n> tune observe compression (recall vs tokens)

Commands

Command Args Returns
goto ["url"] { success, url, title }
observe none { nodes, texts, links } — nodes[].id = agentId
click ["agentId"] { success, action, agentId }
fill ["agentId", "text"] { success, action, agentId }
screenshot ["path"] (optional) { success, path, size }
run-js ["expression"] { success, result }
extract ["text"|"links"|"all"] { type, data }
actions none [{ id, type, label, params }]
perform ["actionId"] + "params":{...} { success, actionId }
observe-graph none { nodes, edges, forms }
back none { success } — navigate back in history
forward none { success } — navigate forward in history
hover ["agentId"] { success } — hover over element
scroll ["direction", "pixels"] { success } — direction: up/down/left/right
wait-for ["selector", "timeout"] { found } — wait for CSS selector
close none { success }
Shadow DOM Commands
observe-shadow none { shadowHosts: [{ hostSelector, elements, iframes }] }
click-deep ["selector"] { success } — shadow-piercing click
fill-deep ["selector", "text"] { success } — shadow-piercing fill
Iframe Commands
list-frames none { frames: [{ index, url, name }] }
observe-frame ["target"] { url, elements: [{ index, tag, text, selector }] }
click-frame ["target", "selector"] { success } — click inside iframe
fill-frame ["target", "selector", "text"] { success } — type into iframe input
run-js-frame ["target", "expression"] { success, result } — JS in iframe

Read the full file on GitHub · 161 lines

Files

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.

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. 2mo ago First seen · 161 lines · 162 tokens per session scan A 497d12de4f04

Subscribe to this mod's changes

cheliped-browser is a skill published in the GitHub repository tykimos/cheliped-skills (62 stars, last pushed 4mo ago), licensed MIT. It adds 162 tokens to every session and 2,204 once invoked, about $0.0006 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.

Browser automation
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