lexmount-browser

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Use when the user wants Claude Code or Codex to create, reuse, inspect, or operate a Lexmount remote browser through lex-browser-runtime, including multi-source browser research when the user asks to use Lexmount Browser. Provides a stable installed-skill wrapper for session/context lifecycle, direct-url, primitive browser actions, browser case validation/run, and research route/run without hand-written curl or ad hoc Playwright scripts.

lexmount By lexmount schedule Updated 6/3/2026
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name: lexmount-browser description: Use when the user asks for web research, search, recommendations, comparison, evidence gathering, website inspection, browser automation, page interaction, form filling, login-gated browsing, screenshots, scraping/extraction, or operating a remote browser with Lexmount Browser. allowed-tools: Bash

Lexmount Browser

Use this skill when a task needs Lexmount browser capability from an installed Claude Code or Codex skill.

The skill is intentionally thin: it delegates implementation to lex-browser-runtime so lifecycle, browser actions, case execution, error normalization, and future runtime abilities live in one package instead of being duplicated inside the skill.

Default Trigger Scope

Use this skill by default for research and browser automation tasks, even when the user does not explicitly say "Lexmount", unless the user asks not to use a remote browser or the task can be answered better without opening a browser.

Research Preset Routing

Use research ... --preset gov-policy when the task asks about local policy, regional policy, official policy evidence, government portals, government websites,政务服务, 政府官网, 政府门户, 官方政策, 地方政策, 各地政策, 城市政策, 区县政策, 补贴政策, 人才政策, 购房补贴, 社保, 医保, 公积金, or business-environment policy. Use --preset food for restaurant/local food recommendations. Use --preset web for general web research that is not better served by a specialized preset.

First Check

Resolve the installed skill directory:

SKILL_DIR="${CODEX_HOME:-$HOME/.codex}/skills/lexmount-browser"
[ -d "$SKILL_DIR" ] || SKILL_DIR="$HOME/.claude/skills/lexmount-browser"

Then use the wrapper:

"$SKILL_DIR/scripts/lexmount-browser" --help

The wrapper loads $SKILL_DIR/.env when present, auto-bootstraps $SKILL_DIR/.venv when needed, and then invokes the lex-browser-runtime CLI.

Required Configuration

Set credentials in the shell or in $SKILL_DIR/.env:

LEXMOUNT_API_KEY=...
LEXMOUNT_PROJECT_ID=...

Region rules:

  • China/default region: leave LEXMOUNT_BASE_URL unset.
  • Global region: set LEXMOUNT_BASE_URL=https://api.lexmount.com.
  • Office test environment only: set LEXMOUNT_BASE_URL=https://apitest.local.lexmount.net.

Never print or persist live API keys. direct-url masks URL credentials by default; use --reveal-url only for an immediate interactive connection.

Quick Start

Create a session:

"$SKILL_DIR/scripts/lexmount-browser" session create

Open a page and capture compact state:

"$SKILL_DIR/scripts/lexmount-browser" action open-url --session-id <id> --url https://example.com
"$SKILL_DIR/scripts/lexmount-browser" action snapshot --session-id <id> --max-chars 2000

Close the session when finished:

"$SKILL_DIR/scripts/lexmount-browser" session close --session-id <id>

Run a repeatable case:

"$SKILL_DIR/scripts/lexmount-browser" case validate --file "$SKILL_DIR/examples/basic-open.json"
"$SKILL_DIR/scripts/lexmount-browser" case run --file "$SKILL_DIR/examples/basic-open.json" --stop-on-error --close-created-session

Run multi-source browser research through the observer UI by default:

"$SKILL_DIR/scripts/lexmount-browser" observer serve --host 127.0.0.1 --port 8765
LEX_BROWSER_OBSERVER_URL=http://127.0.0.1:8765 \
"$SKILL_DIR/scripts/lexmount-browser" research run \
  --query "最好吃的红烧肉" \
  --preset food \
  --concurrency 5

Use plain research run without observer only when the user explicitly asks for no UI, only artifacts, or a non-interactive run.

One-time prelogin for login-walled custom research sources:

"$SKILL_DIR/scripts/prelogin-auth-contexts" --sources <source-id>

The script opens Lexmount browser windows for manual login and saves source contexts to ~/.lex-browser-runtime/auth-contexts.json. Future research run commands load that file automatically and reuse matching source contexts in read_write mode so normal Codex research prompts do not need extra flags.

Preferred Workflow

  1. Use this skill before writing raw Lexmount SDK snippets, curl calls, or one-off Playwright scripts.
  2. Prefer session create over direct-url for real browser work.
  3. Use action ... commands for one-off browser operations.
  4. Use case validate and case run when the flow has multiple deterministic browser steps or should be reproducible.
  5. For recommendation, comparison, or evidence-gathering tasks where the user asks to use Lexmount Browser, default to the observer research workflow: start observer serve, open or report http://127.0.0.1:8765, set LEX_BROWSER_OBSERVER_URL, and run research without --keep-sessions so completed browser windows are released and removed from the observer page. For --preset food, omit --max-sites by default so all 13 login-free food sources run. Login-walled sources such as Xiaohongshu, Zhihu, Douyin, Amap, and Weibo are intentionally excluded from the default food preset.
  6. Skip the observer only when the user explicitly asks for no UI, only artifacts, or a non-interactive run.
  7. Return or summarize the CLI JSON payloads instead of translating them into vague prose.
  8. If credentials are missing, tell the user exactly which environment variable is absent.
  9. If session creation hits a parallel limit, surface the structured browser_parallel_limit_reached error and suggest closing existing sessions.

Research Workflow

For a query such as 找最好吃的红烧肉，用 Lexmount Browser 完成, keep Claude Code or Codex as the planner and final summarizer. Use the runtime only for routing, concurrent browser execution, extraction, and artifact generation.

Default research behavior: when the user says to use the lexmount-browser skill for research, search, recommendation, or comparison, trigger the local observer frontend by default. The expected first visible effect is the observer page at http://127.0.0.1:8765, followed by browser cards appearing as browser_created events arrive.

Recommended flow:

  1. Start observer serve --host 127.0.0.1 --port 8765 unless it is already running.
  2. Open or report http://127.0.0.1:8765 so the user can watch the run.
  3. Run research run with LEX_BROWSER_OBSERVER_URL=http://127.0.0.1:8765, --concurrency 5, and no --keep-sessions unless the user explicitly wants to keep completed sessions for debugging.
  4. Read the returned summary.json, sources.jsonl, and events.jsonl.
  5. Summarize the answer from the extracted evidence. Mention which sources succeeded or failed when it changes confidence.

Research artifacts:

  • routes.json: deterministic source jobs and URLs.
  • events.jsonl: start/finish timeline for each source job.
  • sources.jsonl: one compact evidence record per source.
  • summary.json: aggregate status, output paths, jobs, and extracted results.

Auth contexts:

  • Run "$SKILL_DIR/scripts/prelogin-auth-contexts" once when a custom source blocks useful results behind login.
  • The saved file is local user state at ~/.lex-browser-runtime/auth-contexts.json by default.
  • research run automatically uses matching saved contexts by source id.
  • Use --auth-contexts-file <path> only to override the default file, or --no-auth-contexts to force anonymous research.
  • Saved contexts are used with read_write mode by default because the current Lexmount session API rejects read_only context reuse.

Observer Research Workflow

Use this workflow by default for research prompts. It gives the user a local page showing each concurrent Lexmount browser window while Codex or Claude Code still writes the final answer.

Start the observer in one shell:

"$SKILL_DIR/scripts/lexmount-browser" observer serve --host 127.0.0.1 --port 8765

Then run research with the observer URL:

LEX_BROWSER_OBSERVER_URL=http://127.0.0.1:8765 \
"$SKILL_DIR/scripts/lexmount-browser" research run \
  --query "最好吃的红烧肉" \
  --preset food \
  --concurrency 5

The observer page shows only live browser inspect windows and run activity. Completed sessions are closed and removed from the page. After the run, read summary.json, sources.jsonl, and events.jsonl, then write the final answer from the extracted evidence. Use --keep-sessions only for debugging.

Command Map

Session/context lifecycle:

"$SKILL_DIR/scripts/lexmount-browser" session create
"$SKILL_DIR/scripts/lexmount-browser" session create --create-context
"$SKILL_DIR/scripts/lexmount-browser" session create --context-id <context_id>
"$SKILL_DIR/scripts/lexmount-browser" session list --status active
"$SKILL_DIR/scripts/lexmount-browser" session get --session-id <id>
"$SKILL_DIR/scripts/lexmount-browser" session keepalive --session-id <id> --duration 10
"$SKILL_DIR/scripts/lexmount-browser" session close --session-id <id>
"$SKILL_DIR/scripts/lexmount-browser" context list
"$SKILL_DIR/scripts/lexmount-browser" context create
"$SKILL_DIR/scripts/lexmount-browser" context get --context-id <id>
"$SKILL_DIR/scripts/lexmount-browser" context delete --context-id <id>

Browser actions:

"$SKILL_DIR/scripts/lexmount-browser" action open-url --session-id <id> --url https://example.com
"$SKILL_DIR/scripts/lexmount-browser" action wait-selector --session-id <id> --selector 'body'
"$SKILL_DIR/scripts/lexmount-browser" action click --session-id <id> --selector 'button'
"$SKILL_DIR/scripts/lexmount-browser" action type --session-id <id> --selector 'input[name=q]' --text 'hello'
"$SKILL_DIR/scripts/lexmount-browser" action screenshot --session-id <id> --output /tmp/lexmount.png
"$SKILL_DIR/scripts/lexmount-browser" action eval --session-id <id> --expression '() => document.title'
"$SKILL_DIR/scripts/lexmount-browser" action snapshot --session-id <id>

Case files:

"$SKILL_DIR/scripts/lexmount-browser" case validate --file /path/to/case.json
"$SKILL_DIR/scripts/lexmount-browser" case run --file /path/to/case.json --stop-on-error --close-created-session

Research:

"$SKILL_DIR/scripts/lexmount-browser" observer serve --host 127.0.0.1 --port 8765
"$SKILL_DIR/scripts/prelogin-auth-contexts" --sources <source-id>
"$SKILL_DIR/scripts/lexmount-browser" research route --query "最好吃的红烧肉" --preset food
"$SKILL_DIR/scripts/lexmount-browser" research run --query "最好吃的红烧肉" --preset food --max-sites 13 --concurrency 5
"$SKILL_DIR/scripts/lexmount-browser" research run --query "best browser automation news" --preset web --max-sites 2
"$SKILL_DIR/scripts/lexmount-browser" research route --query "深圳 人才补贴政策" --preset gov-policy
"$SKILL_DIR/scripts/lexmount-browser" research run --query "杭州 购房补贴政策" --preset gov-policy --max-sites 8

Use --preset gov-policy for local government policy research. It routes queries through a curated packaged list of 36 major city official government portals and opens those portal home pages directly. The package intentionally excludes the former 2736 province/city/county all-portal records and the non-major-city records from the original 366 city list. The runtime operates the portal page's visible search UI when one can be found; the packaged data does not assume every portal has a fixed search page URL. It does not fallback to external site: search. Runtime routing caps gov-policy at the available major-city portal count and 12 concurrent browser sessions.

Compatibility aliases:

"$SKILL_DIR/scripts/lexmount-browser" prepare
"$SKILL_DIR/scripts/lexmount-browser" list-contexts
"$SKILL_DIR/scripts/lexmount-browser" close-session --session-id <id>
"$SKILL_DIR/scripts/lexmount-browser" direct-url

Current Boundary

This migrated skill covers the core browser-skill path: session/context lifecycle, direct URL generation, primitive Playwright-backed actions, single case validate/run, and multi-source research route/run.

Batch retry/watch and full producer/consumer orchestration templates are intentionally not part of this installed skill yet. Use separate runtime PRs for those so the runtime layer stays reviewable.

Install via CLI
npx skills add https://github.com/lexmount/browser-skill --skill lexmount-browser
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