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<body>
<!-- Nav -->
<nav>
<div class="nav-logo">HyperKitty <span>Chromium</span></div>
<div class="nav-links">
<a href="#architecture" class="active">Architecture</a>
<a href="#supervision">Supervision</a>
<a href="#agent">Agent FSM</a>
<a href="#api">API</a>
<a href="#tests">Tests</a>
<a href="#quickstart">Quickstart</a>
</div>
<div class="nav-right">
<span class="badge green">24 tests β</span>
<span class="badge orange">Erlang/OTP</span>
</div>
</nav>
<!-- Hero -->
<div id="hero">
<div class="hero-title">
<span class="hl">HyperKitty</span> Chromium
</div>
<div class="hero-sub">
An Erlang/OTP-native browser agent platform. Headless Chromium wrapped in an explicit supervision tree β so browser control, agent orchestration, search, and messaging are separate, independently-supervised subsystems rather than library calls inside one monolithic process.
</div>
<div class="hero-stats">
<div class="stat"><div class="stat-num">24</div><div class="stat-label">tests passing</div></div>
<div class="stat"><div class="stat-num">7</div><div class="stat-label">OTP supervisors</div></div>
<div class="stat"><div class="stat-num">11</div><div class="stat-label">search pipeline stages</div></div>
<div class="stat"><div class="stat-num">14</div><div class="stat-label">browser capability ops</div></div>
<div class="stat"><div class="stat-num">6</div><div class="stat-label">REST + WS API domains</div></div>
</div>
</div>
<hr>
<!-- Architecture -->
<section id="architecture">
<div class="section-label">Overview</div>
<div class="section-title">The core principle</div>
<div class="section-sub">An LLM-driven agent is a planning function that proposes tool calls. It is never trusted with direct, unchecked access to a browser process. Every tool call crosses an explicit, typed capability boundary β enforced by Erlang code, not by the prompt β before it reaches Chromium.</div>
<div class="cards">
<div class="card">
<div class="card-icon">π</div>
<div class="card-title">HK-BROWSER</div>
<div class="card-body">Launches a real headless Chromium OS process per session. Drives it over CDP (via <code>gun</code>) and Chrome's HTTP control endpoint. 14-operation typed capability interface with auth + argument validation.</div>
<span class="card-tag tag-green">gen_server</span>
</div>
<div class="card">
<div class="card-icon">π€</div>
<div class="card-title">HK-AGENT</div>
<div class="card-body">A <code>gen_statem</code> agent loop enforcing configurable action, time, network, and search-iteration limits before any tool call reaches the browser. 7-state FSM from created β completed/failed/terminated.</div>
<span class="card-tag tag-blue">gen_statem</span>
</div>
<div class="card">
<div class="card-icon">π</div>
<div class="card-title">HK-SEARCH</div>
<div class="card-body">An 11-stage pipeline where each stage is a literal state. Emits an ordered event per stage with a pluggable provider behaviour and a mock reference implementation.</div>
<span class="card-tag tag-orange">pipeline</span>
</div>
<div class="card">
<div class="card-icon">π‘</div>
<div class="card-title">HK-MSG</div>
<div class="card-body">Append-only event bus with WebSocket streaming. Every action, state transition, and result is published before it is acted on β making the system fully observable.</div>
<span class="card-tag tag-purple">event bus</span>
</div>
<div class="card">
<div class="card-icon">π</div>
<div class="card-title">HK-API</div>
<div class="card-body">6-domain REST + WebSocket API built on Cowboy. Agents, browsers, search, messages, events, health β all independently addressable. OpenAPI-compatible route layout.</div>
<span class="card-tag tag-blue">Cowboy + REST</span>
</div>
<div class="card">
<div class="card-icon">β₯</div>
<div class="card-title">HK-HEALTH</div>
<div class="card-body">Aggregate subsystem health β all 7 subsystems up or down in one call. Used by the observability frontend and external monitoring. No external dependency.</div>
<span class="card-tag tag-green">monitoring</span>
</div>
</div>
</section>
<!-- Supervision tree -->
<section id="supervision">
<div class="section-label">OTP</div>
<div class="section-title">Supervision tree</div>
<div class="section-sub"><code>rest_for_one</code> at the root β if the event bus dies, everything that depends on it restarts too. Each browser and agent is its own isolated process with its own restart budget.</div>
<div id="tree-container">
<pre class="tree"><span class="tree-root">hyperkitty_sup</span> <span class="tree-note">(rest_for_one, intensity 8/10)</span>
<span class="tree-line"> βββ</span> <span class="tree-sup">hk_event_sup</span> <span class="tree-note">(one_for_one)</span>
<span class="tree-line"> β βββ</span> <span class="tree-worker">hk_event_bus</span> <span class="tree-note">[gen_server] append-only audit log + pub/sub</span>
<span class="tree-line"> βββ</span> <span class="tree-sup">hk_messaging_sup</span> <span class="tree-note">(one_for_one)</span>
<span class="tree-line"> β βββ</span> <span class="tree-worker">hk_messaging_portal</span> <span class="tree-note">[gen_server] HK-MSG</span>
<span class="tree-line"> βββ</span> <span class="tree-sup">hk_browser_sup</span> <span class="tree-note">(one_for_one)</span>
<span class="tree-line"> β βββ</span> <span class="tree-worker">hk_browser_registry</span> <span class="tree-note">[gen_server] session_id β pid</span>
<span class="tree-line"> β βββ</span> <span class="tree-sup">hk_browser_session_sup</span> <span class="tree-note">(simple_one_for_one, transient)</span>
<span class="tree-line"> β βββ</span> <span class="tree-worker">hk_browser_session</span> <span class="tree-note">[gen_server] owns a Chrome OS process per session</span>
<span class="tree-line"> βββ</span> <span class="tree-sup">hk_agent_sup</span> <span class="tree-note">(one_for_one)</span>
<span class="tree-line"> β βββ</span> <span class="tree-worker">hk_agent_registry</span> <span class="tree-note">[gen_server] agent_id β pid</span>
<span class="tree-line"> β βββ</span> <span class="tree-sup">hk_agent_fsm_sup</span> <span class="tree-note">(simple_one_for_one, transient)</span>
<span class="tree-line"> β βββ</span> <span class="tree-worker">hk_agent_fsm</span> <span class="tree-note">[gen_statem] one per agent, 7-state FSM</span>
<span class="tree-line"> βββ</span> <span class="tree-sup">hk_search_sup</span> <span class="tree-note">(one_for_one)</span>
<span class="tree-line"> β βββ</span> <span class="tree-worker">hk_search_registry</span>
<span class="tree-line"> β βββ</span> <span class="tree-sup">hk_search_job_sup</span> <span class="tree-note">(simple_one_for_one)</span>
<span class="tree-line"> β βββ</span> <span class="tree-worker">hk_search_job</span> <span class="tree-note">[gen_statem] 11-stage pipeline per job</span>
<span class="tree-line"> βββ</span> <span class="tree-sup">hk_api_sup</span>
<span class="tree-line"> β βββ</span> <span class="tree-worker">hk_api_listener</span> <span class="tree-note">[Cowboy] REST + WS (trap_exit for clean teardown)</span>
<span class="tree-line"> β βββ</span> <span class="tree-worker">hk_frontend_*</span> <span class="tree-note">connected client registry</span>
<span class="tree-line"> βββ</span> <span class="tree-worker">hk_health</span> <span class="tree-note">[gen_server] aggregate subsystem health</span></pre>
</div>
</section>
<!-- Agent FSM -->
<section id="agent">
<div class="section-label">gen_statem</div>
<div class="section-title">Agent state machine</div>
<div class="section-sub">Every agent is a <code>gen_statem</code> process. No tool call reaches the browser without passing through this FSM β configurable action limits, time limits, and network limits are enforced structurally, not by the LLM.</div>
<div style="margin-bottom: 32px;">
<div class="fsm-states">
<div class="fsm-state start">created</div>
<div class="fsm-arrow">β</div>
<div class="fsm-state middle">ready</div>
<div class="fsm-arrow">β</div>
<div class="fsm-state middle">planning</div>
<div class="fsm-arrow">β</div>
<div class="fsm-state middle">executing</div>
<div class="fsm-arrow">β</div>
<div class="fsm-state middle">waiting</div>
<div class="fsm-arrow">β</div>
<div class="fsm-state end-ok">completed</div>
</div>
<div style="margin-top: 12px; display: flex; gap: 12px; flex-wrap: wrap;">
<div class="fsm-state end-fail" style="font-size:11px">failed</div>
<div class="fsm-state end-fail" style="font-size:11px">terminated</div>
<span style="color:var(--dim);font-size:12px;align-self:center">β reachable from any state on limit exceeded</span>
</div>
</div>
<div class="cards">
<div class="card">
<div class="card-title">Bugs found and fixed</div>
<div class="card-body" style="margin-top:8px">
<div style="margin-bottom:8px"><span style="color:var(--red)">Bug 1:</span> <code>ready</code> state's tool-call handler routed to wrong next state β silently dropping the action. Fixed: correct state transition target.</div>
<div><span style="color:var(--red)">Bug 2:</span> OTP race where a mid-tree supervisor killed abruptly outran its children's cleanup. Fixed: <code>hk_sup_util</code> retry-on-death-wait helper + <code>trap_exit</code> on <code>hk_api_listener</code>.</div>
</div>
</div>
<div class="card">
<div class="card-title">Chrome PUT fix</div>
<div class="card-body" style="margin-top:8px">Modern Chrome requires <code>PUT</code> for <code>/json/new</code> β newer Chrome dropped support for <code>GET</code> on that endpoint. <code>hk_chrome_http.erl</code> updated accordingly.</div>
<span class="card-tag tag-orange">integration fix</span>
</div>
</div>
</section>
<!-- API -->
<section id="api">
<div class="section-label">HTTP + WebSocket</div>
<div class="section-title">API reference</div>
<div class="section-sub">All routes served by Cowboy. WebSocket at <code>/api/events/ws</code> streams every event in real time.</div>
<div style="background:var(--bg1);border:1px solid var(--border);border-radius:8px;overflow:hidden">
<table class="api-table">
<thead>
<tr><th>Method</th><th>Path</th><th>Description</th></tr>
</thead>
<tbody>
<tr><td><span class="method GET">GET</span></td><td class="endpoint">/api/health</td><td class="ep-desc">All 7 subsystems up/down in one call</td></tr>
<tr><td><span class="method POST">POST</span></td><td class="endpoint">/api/agents</td><td class="ep-desc">Create agent with config (limits, browser_session_id)</td></tr>
<tr><td><span class="method GET">GET</span></td><td class="endpoint">/api/agents/:id</td><td class="ep-desc">Agent state + current FSM state</td></tr>
<tr><td><span class="method DELETE">DELETE</span></td><td class="endpoint">/api/agents/:id</td><td class="ep-desc">Terminate agent (transitions to terminated)</td></tr>
<tr><td><span class="method POST">POST</span></td><td class="endpoint">/api/browsers</td><td class="ep-desc">Spawn headless Chromium session</td></tr>
<tr><td><span class="method POST">POST</span></td><td class="endpoint">/api/browsers/:id/capability</td><td class="ep-desc">Execute typed browser capability (14 ops)</td></tr>
<tr><td><span class="method DELETE">DELETE</span></td><td class="endpoint">/api/browsers/:id</td><td class="ep-desc">Kill Chromium process, clean up session</td></tr>
<tr><td><span class="method POST">POST</span></td><td class="endpoint">/api/search</td><td class="ep-desc">Start 11-stage search pipeline job</td></tr>
<tr><td><span class="method GET">GET</span></td><td class="endpoint">/api/search/:id</td><td class="ep-desc">Search job state + stage progress</td></tr>
<tr><td><span class="method GET">GET</span></td><td class="endpoint">/api/messages</td><td class="ep-desc">Recent messages from event bus</td></tr>
<tr><td><span class="method GET">GET</span></td><td class="endpoint">/api/events/recent</td><td class="ep-desc">Last N events across all subsystems</td></tr>
<tr><td><span class="method WS">WS</span></td><td class="endpoint">/api/events/ws</td><td class="ep-desc">Real-time event stream (all subsystems)</td></tr>
</tbody>
</table>
</div>
</section>
<!-- Tests -->
<section id="tests">
<div class="section-label">EUnit</div>
<div class="section-title">24 tests β 0 failures</div>
<div class="section-sub">Includes real headless Chromium integration tests and chaos tests that kill live processes and verify recovery. Run with <code>rebar3 eunit</code>.</div>
<div class="test-grid">
<div class="test-item"><span class="check">β</span><span class="test-name">hk_agent_fsm_tests</span><span class="test-type">FSM</span></div>
<div class="test-item"><span class="check">β</span><span class="test-name">hk_browser_capability_tests</span><span class="test-type">integration</span></div>
<div class="test-item"><span class="check">β</span><span class="test-name">hk_browser_session_tests</span><span class="test-type">integration</span></div>
<div class="test-item"><span class="check">β</span><span class="test-name">hk_messaging_portal_tests</span><span class="test-type">unit</span></div>
<div class="test-item"><span class="check">β</span><span class="test-name">hk_search_job_tests</span><span class="test-type">pipeline</span></div>
<div class="test-item"><span class="check">β</span><span class="test-name">hk_search_pipeline_tests</span><span class="test-type">pipeline</span></div>
<div class="test-item"><span class="check">β</span><span class="test-name">hk_supervision_tests</span><span class="test-type">chaos</span></div>
<div class="test-item"><span class="check">β</span><span class="test-name">hk_test_helper</span><span class="test-type">harness</span></div>
</div>
<div style="margin-top:24px;background:var(--bg1);border:1px solid var(--green);border-radius:6px;padding:16px;max-width:500px">
<div style="color:var(--green);font-weight:bold;margin-bottom:8px">Test output</div>
<div style="font-size:12px;color:var(--dim)">
<div>24/24 tests pass</div>
<div>SUPERVISOR/CRASH/ERROR REPORTs in output are expected β</div>
<div>chaos tests deliberately kill live processes to verify recovery.</div>
</div>
</div>
</section>
<!-- Quickstart -->
<section id="quickstart">
<div class="section-label">Setup</div>
<div class="section-title">Quickstart</div>
<div class="section-sub">Requires Erlang/OTP 25+, rebar3, and Chromium. Bootstrap script handles the rest.</div>
<div class="code-block"><span class="cmt"># Bootstrap environment (macOS via Homebrew)</span>
<span class="kw">bash</span> bin/bootstrap.sh
<span class="cmt"># Build</span>
<span class="kw">rebar3</span> compile
<span class="cmt"># Run tests</span>
<span class="kw">rebar3</span> eunit
<span class="cmt"># Start</span>
<span class="kw">rebar3</span> shell
<span class="cmt"># Health check</span>
<span class="kw">curl</span> http://localhost:8080/api/health</div>
<div style="margin-top: 24px;">
<a href="https://github.com/SNAPKITTYWEST/hyperkitty-chromium" style="
display: inline-flex; align-items: center; gap: 8px;
padding: 10px 20px; border-radius: 6px;
background: rgba(0,255,136,0.1); border: 1px solid var(--green);
color: var(--green); text-decoration: none; font-size: 13px; font-weight: bold;
transition: background 0.15s;
">View on GitHub β</a>
</div>
</section>
<footer>
HyperKitty Chromium β Erlang/OTP Browser Agent Platform<br>
<a href="https://github.com/SNAPKITTYWEST/hyperkitty-chromium">SNAPKITTYWEST/hyperkitty-chromium</a> Β·
BSL-1.1 / AGPL-3.0 / MPL-2.0 Β· Patent Pending β Bel Esprit D'Accord Irrevocable Trust
</footer>
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