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testbed: agent demo loop (LLM via OpenAI-compatible endpoints + scripted fallback + auto handoff), E2E verified over WebSocket

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opencode
2026-08-08 04:28:31 +03:00
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scripts/run_bridge.sh
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#!/usr/bin/env bash
# Start the AICC capsule testbed bridge over WebSocket (headless).
# Usage: scripts/run_bridge.sh [port] (default 8765)
set -euo pipefail
cd "$(dirname "$0")/.."
PORT="${1:-8765}"
exec testbed/.venv/bin/python -m testbed.bridge --host 127.0.0.1 --port "$PORT"
testbed/demo.py
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"""End-to-end demo: an agent drives the capsule to the beacon and interacts.
Two agents:
- ``llm`` (default): any tool-calling LLM via an OpenAI-compatible endpoint.
Ships configured for a local ollama (http://localhost:11434/v1), swap
``--base-url``/``--model`` for any provider. The agent perceives through
the protocol tools only; vision frames are summarized into a coarse color
grid so text-only models can navigate too. The loop keeps a compact
CURRENT STATE note (agent-side working memory, protocol §9) and nudges the
model back on track if it drifts (no tool calls, moving away, collisions).
- ``scripted``: deterministic sensor-driven fallback (same tools, no LLM).
- ``auto`` (default): tries the LLM for a bounded number of steps, then
hands off to the scripted agent so the demo always reaches the beacon.
Every tool call and result is printed to stdout as a transcript. The final
first-person frame is saved to ``--frame`` (default demo_final_frame.png).
Usage:
python -m testbed.demo --agent llm --model gemma4:e2b
python -m testbed.demo --agent scripted
"""
from __future__ import annotations
import argparse
import asyncio
import base64
import io
import json
import math
import sys
from typing import Any
from aicc.client import AICCClient
from aicc.errors import ToolError
from aicc.protocol import SessionInit, ToolSpec
from aicc.transport.websocket import WebSocketClientTransport
DEFAULT_URL = "ws://127.0.0.1:8765"
DEFAULT_BASE_URL = "http://localhost:11434/v1"
DEFAULT_MODEL = "gemma4:e2b"
NUDGE = (
"You have not called a tool. Continue the mission: check the CURRENT STATE note, "
"then call a tool (turn or move, or interact if within 1.6 m)."
)
MISSION = (
"You are a capsule AI inside a 16x16 m room. Your mission: reach the glowing "
"beacon pillar and activate it with the interact tool. "
"World: yaw 0 faces +z, 90 faces +x, coordinates in meters; three wooden "
"crates block parts of the room. "
"Perception: proprioception gives position/heading; world_query gives the room "
"layout and the beacon's exact coordinates (call it once at the start); "
"vision gives the first-person frame; hear tells you how close you are to the beacon. "
"Every tool result is prefixed with a CURRENT STATE note: read it — it tells you "
"your position, heading, distance to the beacon, and the bearing to turn toward it. "
"Standard loop, one action per turn: "
"1. call proprioception (and hear every few steps); "
"2. compute the bearing to the beacon and turn toward it (turn yaw_deg = that bearing, max 90 per call); "
"3. move forward 1.0 m; if the result says collision, turn 60-90 degrees and go around, "
"then re-aim. "
"Never walk into a crate or wall twice in a row. "
"Call interact ONLY when proprioception puts you within 1.6 m of the beacon. "
"Keep tool calls short and decisive. Stop once the beacon is active."
)
COLOR_NAMES = [
("beacon_cyan", (120, 210, 235)),
("beacon_yellow", (255, 190, 90)),
("crate_red", (178, 64, 54)),
("crate_blue", (64, 96, 178)),
("crate_olive", (128, 128, 60)),
("floor_gray", (60, 60, 66)),
("wall_gray", (96, 96, 106)),
("dark", (30, 30, 36)),
]
def _nearest_color(r: float, g: float, b: float) -> str:
best, best_d = "dark", 1e9
for name, (cr, cg, cb) in COLOR_NAMES:
d = (r - cr) ** 2 + (g - cg) ** 2 + (b - cb) ** 2
if d < best_d:
best, best_d = name, d
return best
def vision_digest(png_b64: str, cols: int = 12, rows: int = 9) -> str:
"""Coarse color-grid summary of a vision frame (agent-side preprocessing)."""
try:
from PIL import Image
img = Image.open(io.BytesIO(base64.b64decode(png_b64))).convert("RGB")
except Exception: # noqa: BLE001 - digest is best-effort
return "(no digest: unreadable frame)"
small = img.resize((cols, rows))
grid: list[list[tuple[int, int, int]]] = []
for r in range(rows):
row: list[tuple[int, int, int]] = []
for c in range(cols):
px = small.getpixel((c, r))
if isinstance(px, (tuple, list)) and len(px) >= 3:
row.append((int(px[0]), int(px[1]), int(px[2])))
elif isinstance(px, (int, float)):
v = int(px)
row.append((v, v, v))
else:
row.append((0, 0, 0))
grid.append(row)
lines = []
for r in range(rows):
lines.append(" ".join(_nearest_color(*grid[r][c]) for c in range(cols)))
return f"frame digest ({cols}x{rows}, center = where you face):\n" + "\n".join(
lines
)
# ---------------------------------------------------------------------------
# LLM agent (OpenAI-compatible)
# ---------------------------------------------------------------------------
def to_openai_tools(tools: list[ToolSpec]) -> list[dict[str, Any]]:
out = []
for t in tools:
if t.id in (
"echo",
"boom",
"bump",
): # conformance-only tools: not for the agent
continue
out.append(
{
"type": "function",
"function": {
"name": t.id,
"description": t.description,
"parameters": t.input_schema,
},
}
)
return out
async def run_llm_agent(
client: AICCClient,
manifest: SessionInit,
*,
base_url: str,
api_key: str,
model: str,
max_steps: int,
) -> dict[str, Any]:
from openai import AsyncOpenAI
ac = AsyncOpenAI(base_url=base_url, api_key=api_key)
tools = to_openai_tools(manifest.tools)
messages: list[dict[str, Any]] = [
{"role": "system", "content": MISSION},
{
"role": "user",
"content": "Begin your mission. Use the tools to reach and activate the beacon.",
},
]
summary: dict[str, Any] = {
"steps": 0,
"tool_calls": 0,
"result": None,
"interacted": False,
}
# Agent-side working memory: a compact summary of state the model has
# already observed via sensors, prefixed to tool results so small models
# don't drift (protocol §9: agent memory is the agent's concern).
beacon_pos: tuple[float, float] | None = None
pos: tuple[float, float] | None = None
yaw: float = 0.0
def state_hint() -> str:
if pos is None:
return ""
if beacon_pos is not None:
dist = math.hypot(beacon_pos[0] - pos[0], beacon_pos[1] - pos[1])
bearing = (
math.degrees(math.atan2(beacon_pos[0] - pos[0], beacon_pos[1] - pos[1]))
- yaw
) % 360.0
return (
f"CURRENT STATE: you are at ({pos[0]:.2f}, {pos[1]:.2f}), heading {yaw:.1f} deg; "
f"the beacon is {dist:.2f} m away at relative bearing {bearing:.0f} deg. "
f"Action: turn yaw_deg={bearing:.0f} to face it, then move forward."
)
return f"CURRENT STATE: you are at ({pos[0]:.2f}, {pos[1]:.2f}), heading {yaw:.1f} deg."
def observe(output: dict[str, Any]) -> None:
nonlocal pos, yaw
if isinstance(output.get("position"), dict):
pos = (output["position"]["x"], output["position"]["z"])
if isinstance(output.get("rotation"), dict):
yaw = output["rotation"]["yaw_deg"] % 360.0
def log(role: str, msg: str) -> None:
print(f"[{role}] {msg}")
# Progress monitor: if the capsule keeps moving away from the beacon,
# reflect that back to the model as a correction (framework-style loop).
dist_history: list[float] = []
corrections = 0
last_correct_step = -99
last_collision_step = -99
def distance_to_beacon() -> float:
if pos is None or beacon_pos is None:
return float("nan")
return math.hypot(beacon_pos[0] - pos[0], beacon_pos[1] - pos[1])
def maybe_correct(step: int) -> None:
nonlocal corrections, last_correct_step
if pos is None or beacon_pos is None:
return
dist = distance_to_beacon()
if not math.isfinite(dist) or dist < 2.0:
return
dist_history.append(dist)
recent = dist_history[-4:]
moving_away = len(recent) == 4 and all(
recent[i] > recent[i + 1] for i in range(3)
)
bearing = (
math.degrees(math.atan2(beacon_pos[0] - pos[0], beacon_pos[1] - pos[1]))
- yaw
) % 360.0
deviation = min(bearing, 360.0 - bearing)
facing_wrong = dist > 4.0 and deviation > 40.0 and step - last_correct_step > 3
detouring = step - last_collision_step < 3
if (moving_away or (facing_wrong and not detouring)) and corrections < 5:
corrections += 1
last_correct_step = step
hint = state_hint()
msg = (
"You are not making progress toward the beacon. Stop and follow the CURRENT "
f"STATE note exactly: {hint} Call turn with that yaw_deg, then move forward."
)
messages.append({"role": "user", "content": msg})
log("agent", "(correction: re-aim at the beacon)")
dist_history.clear()
for step in range(max_steps):
summary["steps"] = step + 1
try:
resp = await ac.chat.completions.create(
model=model, messages=messages, tools=tools, tool_choice="auto"
)
except Exception as exc: # noqa: BLE001 - provider errors end the demo
log("agent", f"LLM error: {exc}")
summary["result"] = f"LLM error: {exc}"
return summary
choice = resp.choices[0]
if choice.message.content:
log("agent", choice.message.content[:400])
messages.append({"role": "assistant", "content": choice.message.content})
calls = choice.message.tool_calls
if not calls:
# Nudge a model that drifted into plain text back to acting.
silent = (not choice.message.content) or len(choice.message.content) < 8
already_nudged = bool(messages) and messages[-1].get("content") == NUDGE
if silent or already_nudged:
summary["result"] = "model produced no tool call"
return summary
messages.append({"role": "user", "content": NUDGE})
log("agent", "(nudge: no tool call; continue the mission)")
continue
messages.append(
{
"role": "assistant",
"content": choice.message.content or "",
"tool_calls": [
{
"id": c.id,
"type": "function",
"function": {
"name": c.function.name,
"arguments": c.function.arguments,
},
}
for c in calls
],
}
)
for tc in calls:
name = tc.function.name
try:
args = json.loads(tc.function.arguments or "{}")
except json.JSONDecodeError:
args = {}
log("tool", f"{name}({json.dumps(args)})")
try:
result = await client.call_tool(name, args)
output = result.output
extra = ""
if name == "vision" and isinstance(output.get("png_b64"), str):
extra = "\n" + vision_digest(output["png_b64"])
output = dict(output, png_b64="<binary, decoded for digest>")
log("bridge", f"ok {json.dumps(output)[:500]}{extra}")
messages.append(
{
"role": "tool",
"tool_call_id": tc.id,
"content": json.dumps(result.output) + extra,
}
)
summary["tool_calls"] += 1
if name == "world_query":
b = output.get("beacon")
if isinstance(b, dict):
beacon_pos = (b["x"], b["z"])
observe(output)
hint = state_hint()
if hint:
messages[-1] = dict(
messages[-1], content=hint + "\n" + messages[-1]["content"]
)
maybe_correct(step)
if name == "move" and output.get("collision"):
last_collision_step = step
obj = output.get("collision_normal")
hint_msg = (
f"You collided with an obstacle (normal {obj}). Turn yaw_deg=90 and move "
"forward twice to get around it, then follow the CURRENT STATE note to re-aim."
)
if not (messages and messages[-1].get("content") == hint_msg):
messages.append({"role": "user", "content": hint_msg})
log("agent", "(collision: go around)")
if name == "interact" and output.get("success"):
summary["interacted"] = True
summary["result"] = output.get("message", "beacon activated")
return summary
except ToolError as e:
log("bridge", f"error {e.code}: {e.message}")
messages.append(
{
"role": "tool",
"tool_call_id": tc.id,
"content": json.dumps({"error": e.code, "message": e.message}),
}
)
summary["tool_calls"] += 1
summary["result"] = f"exceeded {max_steps} steps"
return summary
# ---------------------------------------------------------------------------
# Scripted agent (sensor-driven fallback, no LLM)
# ---------------------------------------------------------------------------
async def run_scripted_agent(
client: AICCClient, manifest: SessionInit, max_steps: int
) -> dict[str, Any]:
summary: dict[str, Any] = {
"steps": 0,
"tool_calls": 0,
"result": None,
"interacted": False,
}
def log(role: str, msg: str) -> None:
print(f"[{role}] {msg}")
wq = (await client.call_tool("world_query", {})).output
beacon = wq["beacon"]
bx, bz = beacon["x"], beacon["z"]
log("agent", f"mission: reach beacon at ({bx}, {bz})")
consecutive_collisions = 0
detour_steps = 0 # >0: escaping an obstacle before re-aiming at the beacon
detour_turns = 0
for step in range(max_steps):
summary["steps"] = step + 1
prop = (await client.call_tool("proprioception", {})).output
summary["tool_calls"] += 1
pos = prop["position"]
dist = math.hypot(bx - pos["x"], bz - pos["z"])
log(
"agent",
f"at ({pos['x']:.2f}, {pos['z']:.2f}) heading {prop['rotation']['yaw_deg']:.1f} deg, {dist:.2f} m to beacon",
)
if dist <= 1.5:
la = (await client.call_tool("look_at", {"target": "beacon"})).output
summary["tool_calls"] += 1
log("tool", 'look_at({"target": "beacon"})')
log("bridge", f"ok {json.dumps(la)}")
frame = (await client.call_tool("vision", {})).output
summary["tool_calls"] += 1
log("tool", "vision({})")
log("bridge", f"ok {frame['width']}x{frame['height']} frame captured")
res = (await client.call_tool("interact", {})).output
summary["tool_calls"] += 1
log("tool", 'interact({"target": "beacon"})')
log("bridge", f"ok {json.dumps(res)}")
if res["success"]:
summary["interacted"] = True
summary["result"] = res["message"]
return summary
log("agent", "not in reach yet; continue")
if detour_steps > 0:
# Escape the obstacle before re-aiming: keep the detour heading.
mv = (await client.call_tool("move", {"forward": 0.8})).output
summary["tool_calls"] += 1
log("tool", 'move({"forward": 0.8}) [detour]')
log("bridge", f"ok {json.dumps(mv)}")
if mv.get("moved", 0.0) < 0.2 and detour_turns < 6:
detour_turns += 1
t = (await client.call_tool("turn", {"yaw_deg": 45.0})).output
summary["tool_calls"] += 1
log("tool", f'turn({{"yaw_deg": 45.0}}) [detour]')
log("bridge", f"ok {json.dumps(t)}")
else:
detour_steps -= 1
continue
target_yaw = math.degrees(math.atan2(bx - pos["x"], bz - pos["z"])) % 360.0
cur_yaw = prop["rotation"]["yaw_deg"] % 360.0
delta = (target_yaw - cur_yaw + 540.0) % 360.0 - 180.0
# Keep off the walls so the capsule can round corners.
if pos["x"] < 1.2:
delta = min(delta, -60.0)
elif pos["x"] > 15.0:
delta = max(delta, 60.0)
if pos["z"] < 1.2:
delta = max(delta, 60.0)
elif pos["z"] > 15.0:
delta = min(delta, -60.0)
if abs(delta) > 4.0:
turn = (await client.call_tool("turn", {"yaw_deg": delta * 0.8})).output
summary["tool_calls"] += 1
log("tool", f'turn({{"yaw_deg": {delta * 0.8:.1f}}})')
log("bridge", f"ok {json.dumps(turn)}")
else:
mv = (await client.call_tool("move", {"forward": 0.8})).output
summary["tool_calls"] += 1
log("tool", 'move({"forward": 0.8})')
log("bridge", f"ok {json.dumps(mv)}")
if mv.get("collision"):
consecutive_collisions += 1
angle = 40.0 if consecutive_collisions < 4 else 90.0
t = (await client.call_tool("turn", {"yaw_deg": angle})).output
summary["tool_calls"] += 1
log("tool", f'turn({{"yaw_deg": {angle}}})')
log("bridge", f"ok {json.dumps(t)}")
detour_steps = 3
detour_turns = 0
else:
consecutive_collisions = 0
summary["result"] = f"exceeded {max_steps} steps"
return summary
# ---------------------------------------------------------------------------
# Shared runner
# ---------------------------------------------------------------------------
async def run_demo(args: argparse.Namespace) -> dict[str, Any]:
transport = WebSocketClientTransport(args.url)
async with AICCClient(transport) as client:
manifest = await client.handshake()
print(f"[handshake] session {manifest.session_id} world {manifest.world.name}")
print(f"[handshake] tools: {[t.id for t in manifest.tools]}\n")
if args.agent == "llm":
summary = await run_llm_agent(
client,
manifest,
base_url=args.base_url,
api_key=args.api_key,
model=args.model,
max_steps=args.max_steps,
)
elif args.agent == "scripted":
summary = await run_scripted_agent(client, manifest, args.max_steps)
else: # auto
from openai import AsyncOpenAI
probe = AsyncOpenAI(base_url=args.base_url, api_key=args.api_key)
try:
await asyncio.wait_for(probe.models.list(), timeout=5.0)
llm_steps = min(args.max_steps, 15)
summary = await run_llm_agent(
client,
manifest,
base_url=args.base_url,
api_key=args.api_key,
model=args.model,
max_steps=llm_steps,
)
if summary.get("interacted"):
return summary
print(
f"\n[auto] LLM did not finish in {llm_steps} steps "
f"({summary.get('result')}); handing off to the scripted agent\n"
)
summary = await run_scripted_agent(client, manifest, args.max_steps)
except Exception as exc: # noqa: BLE001 - fall back to scripted
print(
f"\n[auto] LLM endpoint unavailable ({type(exc).__name__}: {exc}); falling back to scripted agent"
)
summary = await run_scripted_agent(client, manifest, args.max_steps)
frame = (await client.call_tool("vision", {})).output
if args.frame:
raw = base64.b64decode(frame["png_b64"])
with open(args.frame, "wb") as fh:
fh.write(raw)
print(f"\n[final frame saved] {args.frame}")
print(
f"\n[demo done] steps={summary['steps']} tool_calls={summary['tool_calls']} "
f"interacted={summary['interacted']} result={summary['result']}"
)
return summary
def main() -> int:
parser = argparse.ArgumentParser(
description="AICC capsule demo: LLM or scripted agent drives the capsule to the beacon."
)
parser.add_argument(
"--url",
default=DEFAULT_URL,
help=f"bridge WebSocket URL (default {DEFAULT_URL})",
)
parser.add_argument(
"--agent",
choices=["llm", "scripted", "auto"],
default="auto",
help="agent driver (default auto: LLM if reachable, else scripted)",
)
parser.add_argument(
"--base-url", default=DEFAULT_BASE_URL, help="OpenAI-compatible endpoint"
)
parser.add_argument(
"--model", default=DEFAULT_MODEL, help="model id on the endpoint"
)
parser.add_argument("--api-key", default="ollama", help="API key for the endpoint")
parser.add_argument("--max-steps", type=int, default=60, help="max agent steps")
parser.add_argument(
"--frame",
default="demo_final_frame.png",
help="where to save the final vision frame",
)
args = parser.parse_args()
summary = asyncio.run(run_demo(args))
return 0 if summary.get("interacted") else 1
if __name__ == "__main__":
sys.exit(main())