foreguard 0.7.0

Preview what your AI agent is about to do — before it does it. A dry-run trust layer for autonomous agents, powered by kedge.
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<!doctype html>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<meta name="referrer" content="no-referrer" />
<title>foreguard · approve</title>
<style>
  :root {
    --bg: #0f1113;
    --panel: #16191c;
    --line: #262b30;
    --fg: #e8e6e1;
    --muted: #9aa0a6;
    --warn: #d98a4a;
    --danger: #d9534f;
    --ok: #6fbf8b;
  }
  * { box-sizing: border-box; }
  body {
    margin: 0;
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
    background: var(--bg);
    color: var(--fg);
    font: 15px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
    -webkit-font-smoothing: antialiased;
  }
  main { width: 100%; max-width: 620px; }
  .card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 22px;
  }
  .kicker {
    font: 11px/1 ui-monospace, SFMono-Regular, Menlo, monospace;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--muted);
    margin: 0 0 10px;
  }
  h1 {
    margin: 0 0 4px;
    font-size: 20px;
    font-weight: 600;
    letter-spacing: -0.01em;
  }
  .tool { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
  .risk {
    display: inline-block;
    margin-left: 8px;
    padding: 1px 8px;
    border-radius: 999px;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    border: 1px solid currentColor;
  }
  .risk.medium { color: var(--warn); }
  .risk.high { color: var(--danger); }
  .effect {
    margin: 16px 0 0;
    padding: 12px 14px;
    background: #0b0d0f;
    border: 1px solid var(--line);
    border-radius: 6px;
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 13px;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
  }
  .taint {
    margin: 14px 0 0;
    padding: 12px 14px;
    border: 1px solid rgba(217, 83, 79, 0.4);
    background: rgba(217, 83, 79, 0.08);
    border-radius: 6px;
    font-size: 13.5px;
  }
  .taint b { color: var(--danger); }
  .taint code {
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    overflow-wrap: anywhere;
  }
  .actions { display: flex; gap: 10px; margin-top: 20px; }
  button {
    flex: 1;
    padding: 11px 16px;
    font: inherit;
    font-weight: 600;
    border-radius: 7px;
    border: 1px solid var(--line);
    background: #1d2126;
    color: var(--fg);
    cursor: pointer;
  }
  button:hover { border-color: #3a4149; }
  button.approve { border-color: rgba(111, 191, 139, 0.5); color: var(--ok); }
  button:disabled { opacity: 0.5; cursor: default; }
  .foot { margin-top: 14px; font-size: 12.5px; color: var(--muted); }
  .idle { text-align: center; color: var(--muted); }
  .idle .dot {
    display: inline-block;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--ok);
    margin-right: 7px;
    vertical-align: middle;
  }
</style>

<main id="root">
  <div class="card idle"><span class="dot"></span>Waiting for foreguard…</div>
</main>

<script>
  // The token is in this page's own URL. Every request carries it; a page that
  // cannot read this URL cannot forge one.
  const TOKEN = new URLSearchParams(location.search).get('t') || ''
  const root = document.getElementById('root')
  let showing = null
  let busy = false
  // Foreguard is a child of the agent process, so when the run finishes it
  // exits and this page's polling starts failing. That is the *success* path,
  // and it used to render as "foreguard is not running." at the exact moment
  // the approved write had just succeeded. The scariest possible wording for
  // the happiest possible outcome.
  let lastDecision = null

  const esc = (s) =>
    String(s).replace(/[&<>"]/g, (c) => ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;' })[c])

  function idle(msg) {
    root.innerHTML = `<div class="card idle"><span class="dot"></span>${esc(msg)}</div>`
  }

  function render(p) {
    root.innerHTML = `
      <div class="card">
        <p class="kicker">approval required</p>
        <h1><span class="tool">${esc(p.tool)}</span><span class="risk ${esc(p.risk)}">${esc(p.risk)}</span></h1>
        <p style="margin:2px 0 0;color:var(--muted);font-size:13.5px">
          This call mutates. Nothing has run yet.
        </p>
        ${p.effect ? `<div class="effect">${esc(p.effect)}</div>` : ''}
        ${
          p.taint
            ? `<div class="taint"><b>Rule of Two violation.</b> Untrusted data is driving this
                 mutation (<code>${esc(p.taint)}</code>). Approving lets content foreguard did not
                 trust decide what happens.</div>`
            : ''
        }
        <div class="actions">
          <button id="deny">Deny</button>
          <button id="approve" class="approve">Approve &amp; run</button>
        </div>
        <p class="foot">
          Denying keeps it a dry-run. Doing nothing denies it too: the request expires.
        </p>
      </div>`
    document.getElementById('approve').onclick = () => decide(true)
    document.getElementById('deny').onclick = () => decide(false)
  }

  async function decide(approve) {
    if (busy) return
    busy = true
    for (const b of root.querySelectorAll('button')) b.disabled = true
    try {
      await fetch(`/decide?t=${encodeURIComponent(TOKEN)}`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ approve }),
      })
      showing = null
      lastDecision = approve
      idle(approve ? 'Approved. Running it now…' : 'Denied. Nothing was executed.')
    } catch {
      // The proxy went away. It denies on a dropped channel, so the safe thing
      // already happened; just say so.
      idle('Lost contact with foreguard. Nothing was executed.')
    } finally {
      busy = false
    }
  }

  async function poll() {
    try {
      const r = await fetch(`/pending?t=${encodeURIComponent(TOKEN)}`, { cache: 'no-store' })
      if (!r.ok) return idle('This link is no longer valid.')
      const p = await r.json()
      const key = p && JSON.stringify(p)
      if (key !== showing) {
        showing = key
        if (p) render(p)
        else if (!busy) idle('Waiting for foreguard…')
      }
    } catch {
      // Gone. If a decision was made, the run finished and took the proxy with
      // it, which is what is supposed to happen.
      if (lastDecision === true) idle('Approved and executed. The run has finished.')
      else if (lastDecision === false) idle('Denied. Nothing ran, and the run has finished.')
      else idle('Foreguard has exited. Nothing is waiting for approval.')
    }
  }

  poll()
  setInterval(poll, 700)
</script>