We scan this tool’s changelog a few times a day and keep the changes that would alter your agent’s next action: 45 since January 2026, each linked to its source.
agent-browserWhen agent-browser responses announce WebMCP tools on first discovery or a catalog change, select a relevant tool and fetch its schema before invoking it. After compaction or joining an existing session, list tools to recover context.
agent-browser webmcp list <tool> --frame <frame-id> --jsonWhen checking whether a page changed between captures, run `agent-browser screenshot --if-changed`; add `--threshold <0-1>` to treat small pixel changes as unchanged.
agent-browser screenshot --if-changedWhen inspecting a page across browser interactions, run `agent-browser snapshot --delta` for an initial full snapshot and subsequent unchanged revisions or structural changes. Reuse refs for surviving DOM elements across same-document updates; run `agent-browser snapshot --delta --full` to refresh the baseline and take a fresh snapshot after navigation or to observe page changes.
agent-browser snapshot --deltaWhen browsing with locally managed Chrome, discover current-page WebMCP tools with `agent-browser webmcp list` and invoke a selected tool with its parameters. To expose WebMCP through the MCP server, start it with `agent-browser mcp --tools webmcp`; disable WebMCP with `--no-webmcp` or `AGENT_BROWSER_NO_WEBMCP` when needed.
agent-browser open <url>
agent-browser webmcp list
agent-browser webmcp invoke <tool> --params '{"key":"value"}'For named sessions sharing Chrome through `--cdp` or `--auto-connect`, start with `--pin-tab` to persist the session’s CDP target binding and fail with `tab_gone` if that tab closes. Use the target ID as a tab reference; recover with `tab new <url>` or select a tab from `tab list`.
agent-browser --session <name> --cdp <port|url> --pin-tab open <url>When streaming frames and bandwidth is constrained, set the daemon’s JPEG quality and, if downscaling is needed, both maximum frame dimensions. These settings are read once at daemon startup; the dimensions cap encoded frames without resizing the page.
AGENT_BROWSER_STREAM_QUALITY=20 AGENT_BROWSER_STREAM_MAX_WIDTH=640 AGENT_BROWSER_STREAM_MAX_HEIGHT=360 agent-browser stream enableWhen auditing a page, run the `a11y` command with its URL, optionally filtering axe tags, scoping to a selector, or requesting JSON output. The audit uses an embedded axe-core engine and requires a CDP browser.
agent-browser a11y <url>When reverse-engineering a site’s internal API, load the derive-client skill and record the browser flows you need in a HAR. Use the HAR to identify endpoints, derive a standalone client or CLI, and verify its calls against the live API.
agent-browser skills get derive-clientWhen recording a site's API traffic, start HAR capture; text-like response bodies are embedded by default. Choose `--content all` for all bodies or `--content none` for metadata only, then stop capture to save the HAR.
agent-browser network har start
agent-browser open <url>
agent-browser network har stop <output.har>When a browser task needs WebGPU rendering, launch it with `--webgpu` and wait for the app to render before capturing. Run `agent-browser doctor --webgpu` to check rendering and screenshot capture; use `--headed` to probe capture on Windows or Linux.
agent-browser --webgpu open <https://your-webgpu-app.example.com>
agent-browser screenshot <output.png>