kimi-webbridge

name

kimi-webbridge

description

Kimi WebBridge lets AI control the user's real browser — navigate, click, type, read, screenshot, and interact with any website using the user's actual login sessions. Use this skill whenever the user wants to interact with websites, automate browser tasks, scrape web content, or perform any action requiring a real browser. Also use when the user mentions "browser", "webpage", "open URL", "screenshot", or asks to read/interact with any website. Use even for simple-sounding browser requests — the daemon handles all complexity.

Kimi WebBridge

Control the user's real browser (with their login sessions) via a local daemon at http://127.0.0.1:10086.

Health check (always do this first)

~/.kimi-webbridge/bin/kimi-webbridge status

Then act on the result:

• running: true and extension_connected: true — healthy. Proceed with the tool calls below.
• Anything else (command not found, running: false, extension_connected: false, errors) — Read references/operations.md in this skill directory. It has the install / start / diagnose routing table.

Don't guess fixes here — every non-healthy state is handled in references/operations.md.

Tools

Tool	Args	Returns	Note
navigate	url, newTab(bool), group_title	{success, url, tabId}	Always use newTab:true on first call. group_title sets the tab group's visible label
find_tab	url, active(bool)	{success, url, tabId}	Reuse an already-open tab — pass any URL or domain; active:true picks the tab the user is currently viewing, default picks the leftmost match
snapshot	—	{url, title, tree} with @e refs	Accessibility tree (text) — use this to read page content and locate elements
click	selector (@e ref or CSS)	{success, tag, text}	Synthetic el.click()
fill	selector, value	{success, tag, mode}	Works on <input>/<textarea> AND [contenteditable] (ProseMirror/Lexical/Slate). mode is "value" or "contenteditable"
evaluate	code (supports async/await)	{type, value}
screenshot	format(png|jpeg), quality(0-100), optional selector (@e/CSS)	{format, dataLength, data} (base64)	Full page floods context — use helper script (saves to disk, returns path). With selector only that element is captured (small, OK to call API directly)
network	cmd(start|stop|list|detail), filter, requestId	request/response data
upload	selector, files(string[])	{success, fileCount}
save_as_pdf	paper_format, landscape, scale, print_background, file_name	{path, sizeBytes, mimeType, pageTitle}	Render current page → PDF, saved under /tmp/kimi-webbridge-pdfs/
list_tabs	—	{success, tabs:[{tabId, url, title, active, groupTitle}]}	Inspect tabs in the current session
close_tab	—	{success, closed: bool}	Close the current tab in the session
close_session	—	{success, closed: int}	Close all tabs — closed is the count. Always call at task end

Using find_tab

Use find_tab when the user explicitly asks to operate on an already-open tab. It matches by domain, so any URL on the same site works. Without active:true, returns the leftmost matching tab; with active:true, returns the tab the user is currently viewing — pass it when the user says "用我打开的 X" / "在我当前的 X 页面上".

curl -s -X POST http://127.0.0.1:10086/command \
  -d '{"action":"find_tab","args":{"url":"https://www.kimi.com","active":true},"session":"kimi"}'

If find_tab returns "no open tab found", the page is not open — fall back to navigate with newTab:true.

Call Format

curl -s -X POST http://127.0.0.1:10086/command \
  -H 'Content-Type: application/json' \
  -d '{"action":"navigate","args":{"url":"https://example.com","newTab":true}}'

Sessions

Each session maps to a separate browser tab group. Use different session names for different sites to keep operations isolated.

Add "session":"name" to the request body:

curl -s -X POST http://127.0.0.1:10086/command \
  -d '{"action":"navigate","args":{"url":"https://example.com","newTab":true},"session":"my-task"}'

Always assign distinct session names when working with multiple sites in parallel.

Screenshots: Use the Helper Script

Never call the screenshot API directly — it returns base64-encoded image data (hundreds of KB of text) that will flood the context window.

Use scripts/screenshot.sh instead. It decodes and saves the image to disk, returning only the file path:

# Default — saves to /tmp/kimi-webbridge-screenshots/{timestamp}.png
bash "$(dirname "$SKILL_PATH")/scripts/screenshot.sh"

# With a session
bash "$(dirname "$SKILL_PATH")/scripts/screenshot.sh" -s my-task

# Custom output path
bash "$(dirname "$SKILL_PATH")/scripts/screenshot.sh" -o /tmp/page.png

# JPEG format, quality 60
bash "$(dirname "$SKILL_PATH")/scripts/screenshot.sh" -f jpeg -q 60

After getting the file path, use the Read tool to view the image.

If $SKILL_PATH is unavailable, call the script by its absolute path.

Prefer snapshot over CSS/JS selectors

snapshot returns interactive elements with @e refs based on semantic role/name. Use them directly with click/fill — they survive CSS class hash changes that break manually-written selectors.

Fall back to evaluate (JS) only when:

• The target has no @e ref in the snapshot
• You need attributes not in the snapshot (e.g., href)
• You need to dispatch complex event sequences, or scroll

Evaluate Tips

• Always use compact JSON.stringify(data) — never add null, 2 formatting. Indentation and newlines can inflate the response several times over, causing truncation during transmission.
• evaluate calls share the page's JS realm — re-declaring the same const/let across two calls throws SyntaxError. Wrap in an IIFE for a fresh scope: (() => { const x = ...; return x; })().

Text input — use fill

fill handles all three text input shapes. Pass selector (CSS or @e ref) + value:

Target	What fill does	Returned mode
<input> / <textarea>	Sets .value via native setter, fires input/change.	"value"
[contenteditable] (ProseMirror / TipTap / Lexical / Slate / Quill etc.)	Focuses, selects all existing content, calls document.execCommand('insertText', ...) which fires beforeinput/input with inputType:'insertText' and data:value.	"contenteditable"
Other element	Best-effort .value + events.	"value"

fill is clear-and-insert: existing content is replaced. For "append to existing text", read the current value via evaluate, concatenate, then fill with the result.

Form submit / special keys

There's no separate "press Enter" tool. To submit a form, click the submit button directly (click on the @e ref or selector). To dispatch a key event programmatically (e.g. Escape to close a modal):

{"action":"evaluate","args":{"code":"document.activeElement.dispatchEvent(new KeyboardEvent('keydown',{key:'Escape',bubbles:true}))"}}

Save the current page as PDF

save_as_pdf renders the current page to PDF, writes it to /tmp/kimi-webbridge-pdfs/, and returns the file path (the daemon strips the base64 — agent never sees raw PDF bytes).

All args optional:

• paper_format: letter (default) | a4 | legal | a3 | tabloid
• landscape: false (default)
• scale: 1.0 (default), range [0.1, 2.0]
• print_background: true (default) — keep background colors
• file_name: caller-supplied name; if absent, derived from page title

Decoded PDF cap is 100 MB. Above that the daemon refuses; reduce scale or split the page.

Known limitations

• Sites that strictly check event.isTrusted (some banking portals, captcha challenges) reject fill and click because both go through DOM-level synthetic events (isTrusted=false). This is a product boundary, not a bug — no automation primitive that runs on the user's machine without stealing OS focus can produce trusted events on these sites.
• Cross-origin iframes: fill, click, evaluate, and snapshot operate on the top frame. If a target element lives in a same-page iframe from a different origin (e.g. embedded sandbox demos), navigate to the iframe's URL directly instead.

Versions

Daemon, extension, and this skill share a 1:1 version string. Read both via:

~/.kimi-webbridge/bin/kimi-webbridge status
# {"version":"<daemon>", "extension_version":"<extension>"}

If a tool returns an error containing "Please update the Kimi WebBridge extension", the user's extension is older than this skill. Tell the user:

请更新 Kimi WebBridge 浏览器扩展后重试：https://kimi.com/features/webbridge

Don't retry the failed tool. Don't auto-switch skill versions based on extension_version — the pairing protocol isn't finalized.