| 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.
|
| metadata | {"version":"1.10.0"} |
Kimi WebBridge
Control the user's real browser (with their login sessions) via a local daemon at http://127.0.0.1:10086.
Tools
| Tool | Args | Returns | Note |
|---|
navigate | url, newTab(bool), group_title | {success, url, tabId} | First call opens a tab — see Tabs. group_title sets the group's visible label |
find_tab | url, active(bool) | {success, url, tabId} | Select an already-open tab as the current one — see Tabs |
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} | |
cdp | method, params | raw CDP response | Raw chrome.debugger passthrough — what evaluate is to JS, cdp is to CDP. Low-level escape hatch for cases the tools above don't cover |
screenshot | format(png|jpeg), quality(0-100), optional selector (@e/CSS), optional path | {format, path, sizeBytes, mimeType} | Returns a file path, not base64 — see Screenshots |
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, optional path | {path, sizeBytes, mimeType, pageTitle} | Render current page → PDF, returns a file path — see Save as PDF |
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 in the session — closed is the count. See Sessions for when to call |
Tabs and the current tab
Single-tab tools (snapshot, click, fill, screenshot, save_as_pdf) act on the current tab — the one you most recently opened with navigate or selected with find_tab.
- Opening pages: use
newTab:true when pages should coexist (comparing, cross-referencing); omit it to send the current tab to a new URL.
- Going back to an earlier tab: call
find_tab to make a tab you already opened the current one again. Pass the tab's full URL — take it from list_tabs or the earlier navigate result. A bare root domain (kimi.com) may miss a www.kimi.com tab, so prefer the exact URL. active:true picks the tab the user is currently viewing — use it when the user asks to act on a page they already have open ("use my open X tab" / "the X page I'm viewing"); otherwise the leftmost match wins.
- If
find_tab returns "no open tab found", the page isn't open — navigate with newTab:true instead.
curl -s -X POST http://127.0.0.1:10086/command \
-d '{"action":"find_tab","args":{"url":"https://www.kimi.com","active":true},"session":"k26-research"}'
Call Format
Every command carries a top-level session naming the current task — see Sessions below. The examples in later sections omit it only for brevity; in real calls always include it. The command format depends on the user's OS.
macOS / Linux — inline JSON is fine:
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,"group_title":"My task"},"session":"my-task"}'
Windows (PowerShell / cmd) — the shell corrupts non-ASCII characters (Chinese etc.) carried inline in command arguments or pipes; they reach the daemon as ? and the text is unrecoverable. Send every request as a file body instead:
- Write the JSON body to a uniquely-named temp file with your own file-write tool — never with shell
echo/heredoc, which corrupts non-ASCII the same way. Give every request its own filename with a random suffix (e.g. webbridge-req-<random>.json) so concurrent requests never share a file and overwrite each other.
- POST the file with
curl.exe — always curl.exe, never bare curl, which Windows PowerShell aliases to Invoke-WebRequest:
curl.exe -s -X POST http://127.0.0.1:10086/command -H "Content-Type: application/json" --data-binary "@$env:TEMP\webbridge-req-<random>.json"
- Delete the temp file as soon as the request returns — don't leave request bodies on disk.
The bash one-liner examples elsewhere in this document are for brevity — on Windows, send the same JSON via the file-body pattern above instead of inlining it.
Sessions
One task = one session = one tab group. A session collects every tab the task opens into one tab group, so the user sees a single group for "what the agent is doing right now". Pass it as a top-level field of the request body (not inside args).
- Pick one session name at the task's start, put it on every command, and never switch mid-task — even across different sites. Switching session names per site is the #1 cause of fragmented tab groups.
- Name it after the task, not the site (
camping-research, phone-compare). Use multiple sessions only for genuinely unrelated parallel tasks.
group_title is the human-readable group label — write it in the user's language, on the first navigate of the task.
curl -s -X POST http://127.0.0.1:10086/command \
-d '{"action":"navigate","args":{"url":"https://www.kimi.com","newTab":true,"group_title":"K2.6 feature research"},"session":"k26-research"}'
curl -s -X POST http://127.0.0.1:10086/command \
-d '{"action":"navigate","args":{"url":"https://www.moonshot.cn","newTab":true},"session":"k26-research"}'
When the task is done and the user no longer needs the pages, close_session clears the group. If they might follow up, deliver your answer first and leave the tabs open — closing too eagerly throws away work they can still see.
Screenshots
The daemon writes the image to disk and returns {format, path, sizeBytes, mimeType} — never base64, since the model can't read raw image bytes. Take the .path and open it with the Read tool to actually see it.
curl ... -d '{"action":"screenshot","args":{}}'
curl ... -d '{"action":"screenshot","args":{"format":"jpeg","quality":60}}'
curl ... -d '{"action":"screenshot","args":{"selector":"@e123"}}'
A caller-supplied path is honored verbatim (parent dirs created, existing file overwritten) — use a unique name to avoid clobbering. save_as_pdf follows the same rule.
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 (selector = CSS or @e ref, plus the value) works on <input>/<textarea> (returns mode: "value") and on [contenteditable] rich editors — ProseMirror, TipTap, Lexical, Slate, Quill, etc. (returns mode: "contenteditable"), firing the right input events so the page reacts.
fill is clear-and-insert: existing content is replaced. To append, 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 and returns the file path. All args optional:
paper_format: letter (default) | a4 | legal | a3 | tabloidlandscape: false (default)scale: 1.0 (default), range [0.1, 2.0]print_background: true (default) — keep background colorspath: caller-supplied output path; if absent, daemon picks a default under OS temp dir using the page title as the filename
path semantics match screenshot: written verbatim, parent dirs auto-created, existing files overwritten.
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, captchas) ignore click / fill because those fire DOM-level synthetic events (isTrusted=false). For these, tell the user the page needs manual interaction. (Trusted input is possible at the protocol level via the cdp escape hatch, but treat that as advanced.)
- 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.
If a tool call fails (daemon or extension not ready)
If a tool call can't reach the daemon (connection refused), start it yourself — don't ask the user. This is safe to run anytime: it no-ops if the daemon is already up.
macOS / Linux:
~/.kimi-webbridge/bin/kimi-webbridge start
Windows (PowerShell):
& "$env:USERPROFILE\.kimi-webbridge\bin\kimi-webbridge.exe" start
Then retry the tool call. If it still fails — or the browser extension won't connect — point the user to the help page instead of deep-troubleshooting:
Never run stop / restart / uninstall automatically — those kill a running daemon. See references/operations.md for anything deeper.
Version mismatches
If a tool returns an error containing "Please update the Kimi WebBridge extension", the user's browser extension is older than this skill. Don't retry, and don't try to reconcile versions yourself — just tell the user, in their language, to update the extension and retry:
