BROWSER USE - Browser Use Agents: give Browser Use a task and receive completed work. API V4 is current for new integrations. - Browser Infrastructure: connect your agent or automation to managed browsers through SDK, REST, or CDP. Starts at $0.02/browser-hour. - Developer tools: Open Source, Browser Harness, SDK, and MCP support the two products above. [Developer Index](https://browser-use.com/index.md) [Product Map](https://browser-use.com/llms.txt) [Full Product Context](https://browser-use.com/llms-full.txt) [Pricing](https://browser-use.com/pricing.md) [Cloud Docs](https://docs.browser-use.com/cloud/quickstart) [Open Source Docs](https://docs.browser-use.com/open-source/introduction) --- # KEYLIT: 33 WebMCP tools for AI agents ![](https://www.google.com/s2/favicons?domain=keyboard-midi.uset182.chatgpt.site&sz=96) Education & health · keyboard-midi.uset182.chatgpt.site ## KEYLIT Shared browser piano for learning. Agents can run lessons, light next keys, play duets and design instrument sounds. [Open keyboard-midi.uset182.chatgpt.site](https://keyboard-midi.uset182.chatgpt.site/) ## Ask an agent to - Start the first piano lesson for a beginner - Harmonize the chord I'm holding - Design a warm Rhodes-like sound ## 33 tools - `answer-human` Play a call-and-response on the shared keys using the human's last take. Requires that they already played. - `arrange-human-take` Turn the human's last live take into the shared phrase roll and play it back. Requires notes they already played on this page. - `demo-next` Play the next lesson notes as the agent (green keys) so the student can hear them, then they copy on the glowing keys. Requires an active lesson. - `design-instrument` Build a whole instrument sound in one call from a description like "metallic digital orchestral stab" or "thunderous staccato strikes". Prefer this over separate set-layer/set-adsr/set-fx calls. Samples (layer A is… presetName: string?, layerA: object?, layerB: object?, adsr: object?, fx: object? - `export-midi` Download the current phrase as a Standard MIDI File. - `focus-control` Open the STUDIO drawer and visually highlight controls: 'fx', 'layers', 'tempo', 'phrase', or 'studio'. target: string - `follow-human` Shadow the human an octave up in real time on the same keyboard. Toggle off to stop. Better only when they keep playing. on: boolean? - `generate-phrase` Generate a musical stab phrase in a style and play it on the shared instrument. style: string?, bars: integer? - `get-duet-state` See what the human is playing on this live page right now: held notes, last take, and whether you can harmonize, answer, or follow. Use this before acting. - `get-instrument-state` Return the live KEYBED state: layers, FX, phrase, and who is holding which keys (you vs agent). - `get-lesson-state` See the live piano lesson: which keys to play next, computer-key hints, hits, misses, and what the student just played. Call this after they play. - `harmonize-held` Add agent notes around the chord the human is holding on the shared keyboard. Does nothing useful if they are not holding keys — this is the together feature. - `list-lessons` List the piano curriculum on this live page in ladder order, with each lesson's tier and timing mode. First steps: landmarks, first-keys, rh-c-position, lh-c-position, hands-together, c-chord. Basic: hot-cross-buns… - `load-preset` Load the last saved KEYBED preset from localStorage. - `lock-layer` Lock or unlock layer A or B so generate/cycle will not replace it. layer: string, locked: boolean? - `make-track` Generate a complete track in one of the 5 styles (piano, rave, house, techno, garage) with matching sound design, BPM, and drum groove. style: string, bars: integer? - `play-notes` Play MIDI notes as the agent on the shared piano. Lights keys green. The human's amber keys stay theirs. notes: array, velocity: integer?, durationMs: integer? - `reset-sound` Put the instrument back to its factory sound: Steinway, clean effects, default envelope. Keeps the running lesson and the master volume. - `save-preset` Save the current KEYBED preset to localStorage. name: string? - `set-adsr` Set the shared ADSR envelope. Switches the LCD to Envelope. attack: number?, decay: number?, sustain: number?, release: number? - `set-bpm` Set the tempo from 40 to 200 BPM. This is the single most useful thing you can do for a struggling student: halve the tempo, let them play it right, then put it back. Also drives the metronome and the duet loop. bpm: number?, scale: number? - `set-drums` Start or stop a looping backing beat under the keys. Patterns: backbeat, house, techno, garage. Pass an empty pattern to stop. The keys stay a piano; this is accompaniment, not a drum map. pattern: string? - `set-fx` Set the 5-stage FX chain: filter, distortion, crush, delay, reverb (0-1). filter: number?, distortion: number?, crush: number?, delay: number?, reverb: number? - `set-layer` Set layer A or B sample, volume, transpose, or lock. Samples: pn-ivory (Steinway): bright acoustic grand piano, hard percussive attack, long ringing decay pn-felt (Soft Grand): soft felt piano, muted and intimate… layer: string, sampleId: string?, volume: number?, transpose: integer?, locked: boolean?, cycle: integer? - `set-master` Set master volume from 0 to 1. volume: number - `set-mode` Switch what the page is for. 'teach' shows the lesson curriculum, the next-key glow and the hand map. 'dj' hides all of that and opens the STUDIO deck: styles, FX knobs, generated loops, MIDI export. mode: string - `set-next-keys` Light specific next keys for the student to play, in order. Use this to invent a drill. They must press those glowing keys — you cannot play them for the student. notes: array, title: string?, coach: string? - `set-sustain` Hold or release the sustain pedal (MIDI CC 64). Same as a pedal on an APC Key 25, Roland, or Yamaha controller. down: boolean - `set-swing` Set phrase swing from 0 to 0.4. swing: number - `show-next-keys` Show the student the next keys on the shared piano. Target keys glow cyan; on a find-the-note step the black-key group that locates them glows violet. Starts the landmarks lesson if none is running. Does not play the… - `start-lesson` Start a piano lesson on this shared keyboard. Lights the next keys the student must play. Basic lessons wait forever; Intermediate ones run a metronome and grade timing; Advanced ones add a falling-note highway.… lesson: string? - `stop-lesson` End the current piano lesson and clear the next-key glow. - `teach-phrase` Turn the phrase you last generated into a lesson: light its top line, first two bars, one key at a time. Call this after generate-phrase when the student asks to learn what you made. Stops any backing beat. title: string? Tools 33 Registered with JavaScript Scan finished Oct 19, 2026 Tool names and descriptions are what keyboard-midi.uset182.chatgpt.site/ registered when we loaded it in Chrome 154 on Browser Use Cloud. The summary and the “ask an agent” lines are AI-written from them. To call the tools yourself, see [Chrome’s WebMCP docs](https://developer.chrome.com/docs/ai/webmcp). 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