Receipts: the cockpit trust surface — live ledger of every governed decision

docs/cockpit-receipts.md

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+# Cockpit Receipts — the trust surface
+
+The 5th surface of `docs/cockpit-spec.md` §2, and the one no incumbent can copy: a
+live, verifiable ledger of **every governed decision** the enforcing bridge made —
+across all three surfaces — presented to the user.
+
+Gartner told enterprises to *block* agentic browsers because "controls to inspect
+agent intent do not exist at scale." Receipts is that control, made visible: a
+running, signed log of every action the user's agents proposed and exactly what
+policy did about it.
+
+## One stream, three surfaces
+`agent-control-bridge.py` attests every decision as a safe-trace `ReasoningEvent` to
+one append-only stream (`reasoning-events.ndjson`):
+
+| prefix | surface | contract |
+|---|---|---|
+| `browser.*` | the governed browser | `agentActionContract` |
+| `iot.*` | the smart-home / IoT estate | `iotActionContract` |
+| `agent.*` | the cockpit's local agent | `agentMachineActionContract` (Lane 4) |
+
+`scripts/bearbrowser-receipts.py` reads that one stream and serves it as the ledger.
+It derives the surface from the event-type prefix, so it unifies all three
+automatically — a `browser.navigate` permit, an `iot.unlock-door` violation, and an
+`agent.execute-shell` block all land in the same feed.
+
+## API (loopback-only, read-only)
+```
+GET /health                       liveness + stream location
+GET /receipts                     parsed receipts, newest first
+     ?surface=browser|iot|agent   filter by surface
+     &decision=permit|deny        filter by verdict
+     &violations=1                only policy violations
+     &since=<ISO8601>&limit=N
+GET /receipts/summary             counts by surface / decision / class + violations
+GET /receipts/stream              Server-Sent Events live tail (new receipts)
+```
+The cockpit's Receipts panel (client-vue) fetches `/receipts` + subscribes to
+`/receipts/stream` — pointed at this loopback service by the resolver
+(`window.__COCKPIT_CONFIG__`). Nothing reaches off-device; the loopback bind is the
+security boundary (CORS is permissive because the payload is read-only, non-secret).
+
+## Each receipt
+```jsonc
+{ "id": "...", "at": "2026-…Z", "surface": "agent",
+  "action": "execute-shell", "eventType": "agent.policy.violation",
+  "decision": "deny", "class": "prohibited", "violation": true,
+  "reason": "PROHIBITED action 'execute-shell' BLOCKED at decision time",
+  "runRef": "...", "policyRef": "...", "trustLevel": "trusted-control-input",
+  "traceLevel": "workspace-safe" }
+```
+Safe-trace by construction: the summary carries the action + verdict, never raw page
+content, secret values, or private reasoning.
+
+## Verify
+`scripts/tests/test_receipts.py` — seeds real browser + iot decisions via the bridge
+plus a synthetic `agent.*` event, then asserts the projection, filters, and summary:
+7 receipts, 3 surfaces unified, 3 violations flagged, 4 permits / 3 denies.
+
+Wire alongside the other loopback sidecars (`bearbrowser-sidecar-server`,
+`bearbrowser-agent-machine-gate`, the Rust `iot-sidecar`); the browser rewrites the
+ephemeral port into `cockpit-config.js` at launch, same as the rest.

scripts/bearbrowser-receipts.py

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+#!/usr/bin/env python3
+"""BearBrowser Receipts — the cockpit's trust surface (loopback).
+
+Every governed decision the enforcing bridge makes — across ALL three surfaces —
+is attested to one evidence stream (agent-control-bridge.py writes safe-trace
+ReasoningEvents to reasoning-events.ndjson):
+
+    browser.*   the governed browser        (agentActionContract)
+    iot.*       the smart-home / IoT estate (iotActionContract)
+    agent.*     the cockpit's local agent   (agentMachineActionContract)
+
+This service reads that one stream and serves it as a live, verifiable ledger — the
+Receipts surface of docs/cockpit-spec.md §2. It is the trust differentiator: a
+running, signed log of every action the user's agents proposed and exactly what
+policy did about it — the thing Gartner says agentic browsers cannot show. Nothing
+here reaches off-device; it only reads the local evidence stream and serves loopback.
+
+    GET /health                          liveness + stream location
+    GET /receipts?surface=&decision=&violations=&limit=&since=
+                                         parsed receipts, newest first
+    GET /receipts/summary                aggregate counts per surface + verdicts
+    GET /receipts/stream                 Server-Sent Events live tail (new receipts)
+
+    BEARBROWSER_RECEIPTS_PORT            listen port (default 8092)
+    SOURCEOS_REASONING_EVIDENCE         evidence root (default ~/.local/state/sourceos/reasoning)
+"""
+import json
+import os
+import sys
+import time
+import threading
+import pathlib
+from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer
+from urllib.parse import urlparse, parse_qs
+
+PORT = int(os.environ.get("BEARBROWSER_RECEIPTS_PORT", "8092"))
+
+
+def evidence_root() -> pathlib.Path:
+    env = os.environ.get("SOURCEOS_REASONING_EVIDENCE")
+    if env:
+        return pathlib.Path(env).expanduser()
+    return pathlib.Path.home() / ".local" / "state" / "sourceos" / "reasoning"
+
+
+def stream_path() -> pathlib.Path:
+    return evidence_root() / "reasoning-events.ndjson"
+
+
+def surface_of(event_type: str) -> str:
+    head = (event_type or "").split(".", 1)[0]
+    return head if head in ("browser", "iot", "agent") else "other"
+
+
+def to_receipt(ev: dict) -> dict:
+    """Project a raw ReasoningEvent into a receipt row for the surface."""
+    et = ev.get("eventType", "")
+    decision = ev.get("decision")  # merged from the bridge's extra: permit|deny
+    is_violation = et.endswith("policy.violation")
+    if decision is None:
+        decision = "deny" if is_violation else "permit"
+    # action = the event type minus the surface prefix (browser.navigate -> navigate)
+    action = et.split(".", 1)[1] if "." in et else et
+    return {
+        "id": ev.get("id"),
+        "at": ev.get("capturedAt"),
+        "surface": surface_of(et),
+        "eventType": et,
+        "action": action,
+        "decision": decision,
+        "class": ev.get("actionClass"),
+        "violation": is_violation,
+        "reason": ev.get("summary"),
+        "runRef": ev.get("runRef"),
+        "policyRef": ev.get("policyRef"),
+        "approvalTokenRef": ev.get("approvalTokenRef"),
+        "trustLevel": ev.get("trustLevel"),
+        "traceLevel": ev.get("traceLevel"),
+    }
+
+
+def read_events():
+    """Yield parsed events from the stream (skips malformed lines)."""
+    p = stream_path()
+    if not p.exists():
+        return
+    with p.open("r", encoding="utf-8", errors="replace") as fh:
+        for line in fh:
+            line = line.strip()
+            if not line:
+                continue
+            try:
+                yield json.loads(line)
+            except json.JSONDecodeError:
+                continue
+
+
+class ReceiptsHandler(BaseHTTPRequestHandler):
+    protocol_version = "HTTP/1.1"
+
+    def _json(self, obj, status=200):
+        body = json.dumps(obj).encode()
+        self.send_response(status)
+        self.send_header("Content-Type", "application/json")
+        # Loopback-only page (cockpit) reads this; permissive CORS is safe (no secrets,
+        # read-only, loopback bind). The bind — not CORS — is the security boundary.
+        self.send_header("Access-Control-Allow-Origin", "*")
+        self.send_header("Content-Length", str(len(body)))
+        self.end_headers()
+        self.wfile.write(body)
+
+    def do_GET(self):
+        u = urlparse(self.path)
+        q = parse_qs(u.query)
+
+        if u.path == "/health":
+            p = stream_path()
+            return self._json({"ok": True, "stream": str(p), "exists": p.exists()})
+
+        if u.path == "/receipts":
+            receipts = [to_receipt(e) for e in read_events()]
+            # filters
+            surf = (q.get("surface", [None])[0])
+            dec = (q.get("decision", [None])[0])
+            since = (q.get("since", [None])[0])
+            only_viol = q.get("violations", ["0"])[0] in ("1", "true")
+            if surf:
+                receipts = [r for r in receipts if r["surface"] == surf]
+            if dec:
+                receipts = [r for r in receipts if r["decision"] == dec]
+            if only_viol:
+                receipts = [r for r in receipts if r["violation"]]
+            if since:
+                receipts = [r for r in receipts if (r["at"] or "") > since]
+            receipts.reverse()  # newest first
+            try:
+                limit = int(q.get("limit", ["200"])[0])
+            except ValueError:
+                limit = 200
+            return self._json({"count": len(receipts), "receipts": receipts[:limit]})
+
+        if u.path == "/receipts/summary":
+            surfaces, verdicts, violations = {}, {"permit": 0, "deny": 0}, 0
+            classes = {"allowed": 0, "gated": 0, "prohibited": 0}
+            total = 0
+            for e in read_events():
+                r = to_receipt(e)
+                total += 1
+                surfaces[r["surface"]] = surfaces.get(r["surface"], 0) + 1
+                verdicts[r["decision"]] = verdicts.get(r["decision"], 0) + 1
+                if r["class"] in classes:
+                    classes[r["class"]] += 1
+                if r["violation"]:
+                    violations += 1
+            return self._json({
+                "total": total, "bySurface": surfaces, "byDecision": verdicts,
+                "byClass": classes, "violations": violations,
+            })
+
+        if u.path == "/receipts/stream":
+            return self._sse_tail()
+
+        return self._json({"error": "not-found"}, status=404)
+
+    def _sse_tail(self):
+        """Server-Sent Events: emit new receipts as they are appended."""
+        self.send_response(200)
+        self.send_header("Content-Type", "text/event-stream")
+        self.send_header("Cache-Control", "no-cache")
+        self.send_header("Access-Control-Allow-Origin", "*")
+        self.send_header("Connection", "keep-alive")
+        self.end_headers()
+        p = stream_path()
+        # start at end of file; stream appended lines
+        pos = p.stat().st_size if p.exists() else 0
+        try:
+            while True:
+                if p.exists() and p.stat().st_size > pos:
+                    with p.open("r", encoding="utf-8", errors="replace") as fh:
+                        fh.seek(pos)
+                        for line in fh:
+                            line = line.strip()
+                            if not line:
+                                continue
+                            try:
+                                ev = json.loads(line)
+                            except json.JSONDecodeError:
+                                continue
+                            payload = json.dumps(to_receipt(ev))
+                            self.wfile.write(f"data: {payload}\n\n".encode())
+                            self.wfile.flush()
+                        pos = fh.tell()
+                else:
+                    self.wfile.write(b": keepalive\n\n")
+                    self.wfile.flush()
+                time.sleep(1.0)
+        except (BrokenPipeError, ConnectionResetError):
+            return
+
+    def log_message(self, fmt, *args):
+        sys.stderr.write("[receipts] " + (fmt % args) + "\n")
+
+
+def main():
+    srv = ThreadingHTTPServer(("127.0.0.1", PORT), ReceiptsHandler)
+    print(f"[receipts] serving the trust ledger on 127.0.0.1:{PORT} "
+          f"(stream: {stream_path()})", file=sys.stderr)
+    try:
+        srv.serve_forever()
+    except KeyboardInterrupt:
+        srv.shutdown()
+
+
+if __name__ == "__main__":
+    main()

scripts/tests/test_receipts.py

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+#!/usr/bin/env python3
+"""Receipts service proof — the cockpit trust surface reads the evidence stream and
+unifies every governed decision across all three surfaces.
+
+Uses a temp evidence dir. Generates REAL browser + iot decisions via the enforcing
+bridge, plus a synthetic `agent.*` event (the agent-machine surface lands with Lane
+4 / PR #71; the Receipts service derives the surface purely from the event-type
+prefix, so it handles agent.* independently). Asserts the receipts projection,
+filters, and summary.
+
+Run: python3 scripts/tests/test_receipts.py   (exit 0 = PASS)
+"""
+import importlib.util
+import json
+import os
+import pathlib
+import sys
+import tempfile
+
+_ROOT = pathlib.Path(__file__).resolve().parents[2]
+
+
+def _load(name, rel):
+    spec = importlib.util.spec_from_file_location(name, _ROOT / rel)
+    mod = importlib.util.module_from_spec(spec)
+    spec.loader.exec_module(mod)
+    return mod
+
+
+def main() -> int:
+    tmp = tempfile.mkdtemp()
+    os.environ["SOURCEOS_REASONING_EVIDENCE"] = tmp
+
+    acb = _load("acb", "scripts/agent-control-bridge.py")
+    rec = _load("rec", "scripts/bearbrowser-receipts.py")
+
+    def fire(surface, action, params=None, token=None):
+        pol = acb.load_policy(surface)
+        acb.ControlBridge(pol, emit=True).evaluate_action(action, params or {}, token)
+
+    # REAL decisions across the two surfaces that exist on main.
+    fire("browser", "navigate")                # allowed
+    fire("browser", "enter-credentials")       # prohibited -> browser.policy.violation
+    fire("iot", "read-state")                  # allowed
+    fire("iot", "unlock-door")                 # prohibited -> iot.policy.violation
+    fire("iot", "unlock-door", {"actor": "user", "userGesture": True}, "action:unlock-door")  # gated permit
+
+    # Synthetic agent-machine events (Lane 4 surface). Appended directly so Receipts
+    # is proven surface-complete without requiring Lane 4 to be merged.
+    with rec.stream_path().open("a", encoding="utf-8") as fh:
+        fh.write(json.dumps({"id": "ev-agent-1", "eventType": "agent.read-graph",
+                             "decision": "permit", "actionClass": "allowed",
+                             "summary": "read-graph permitted", "capturedAt": "2026-07-19T10:00:00Z"}) + "\n")
+        fh.write(json.dumps({"id": "ev-agent-2", "eventType": "agent.policy.violation",
+                             "decision": "deny", "actionClass": "prohibited",
+                             "summary": "PROHIBITED execute-shell BLOCKED", "capturedAt": "2026-07-19T10:00:01Z"}) + "\n")
+
+    receipts = [rec.to_receipt(e) for e in rec.read_events()]
+    surfaces = {r["surface"] for r in receipts}
+    violations = sum(1 for r in receipts if r["violation"])
+    permits = sum(1 for r in receipts if r["decision"] == "permit")
+    denies = sum(1 for r in receipts if r["decision"] == "deny")
+
+    checks = [
+        ("read 7 receipts", len(receipts) == 7, len(receipts)),
+        ("all 3 surfaces unified", surfaces == {"browser", "iot", "agent"}, surfaces),
+        ("3 violations flagged", violations == 3, violations),
+        ("permits counted", permits == 4, permits),   # browser navigate, iot read, iot unlock w/ gesture, agent read
+        ("denies counted", denies == 3, denies),       # browser creds, iot unlock, agent shell
+        ("summary agrees", rec_summary_ok(rec), True),
+        ("surface filter works", filter_ok(rec), True),
+    ]
+    print("  receipts:", len(receipts), "surfaces:", surfaces, "violations:", violations,
+          "permit/deny:", permits, "/", denies)
+    fails = [(n, got) for n, ok, got in checks if not ok]
+    for n, ok, got in checks:
+        print(f"  [{'PASS' if ok else 'FAIL'}] {n}" + ("" if ok else f"  (got {got})"))
+
+    print("\n" + "=" * 60)
+    if fails:
+        print(f"RESULT: FAIL ({len(fails)})")
+        return 1
+    print("RESULT: PASS — the Receipts surface unifies browser + iot + agent "
+          "governed decisions into one live, verifiable ledger.")
+    return 0
+
+
+def rec_summary_ok(rec) -> bool:
+    surfaces, verdicts, viol, total = {}, {"permit": 0, "deny": 0}, 0, 0
+    for e in rec.read_events():
+        r = rec.to_receipt(e); total += 1
+        surfaces[r["surface"]] = surfaces.get(r["surface"], 0) + 1
+        verdicts[r["decision"]] = verdicts.get(r["decision"], 0) + 1
+        viol += 1 if r["violation"] else 0
+    return total == 7 and viol == 3 and set(surfaces) == {"browser", "iot", "agent"}
+
+
+def filter_ok(rec) -> bool:
+    agent = [rec.to_receipt(e) for e in rec.read_events() if rec.to_receipt(e)["surface"] == "agent"]
+    return len(agent) == 2
+
+
+if __name__ == "__main__":
+    sys.exit(main())