diff --git a/.claude/settings.local.json b/.claude/settings.local.json
index 1490c05..51d6bd8 100644
--- a/.claude/settings.local.json
+++ b/.claude/settings.local.json
@@ -25,7 +25,8 @@
       "mcp__minecraft-bridge__clear_area",
       "mcp__minecraft-bridge__fill",
       "mcp__minecraft-bridge__teleport",
-      "mcp__minecraft-bridge__save_schematic"
+      "mcp__minecraft-bridge__save_schematic",
+      "mcp__minecraft-bridge__get_biome"
     ]
   }
 }
diff --git a/minecraft-mcp/src/minecraft_mcp/__pycache__/server.cpython-314.pyc b/minecraft-mcp/src/minecraft_mcp/__pycache__/server.cpython-314.pyc
index 9bd2de0..57660ae 100644
Binary files a/minecraft-mcp/src/minecraft_mcp/__pycache__/server.cpython-314.pyc and b/minecraft-mcp/src/minecraft_mcp/__pycache__/server.cpython-314.pyc differ
diff --git a/minecraft-mcp/src/minecraft_mcp/server.py b/minecraft-mcp/src/minecraft_mcp/server.py
index ebd8833..06cd6e1 100644
--- a/minecraft-mcp/src/minecraft_mcp/server.py
+++ b/minecraft-mcp/src/minecraft_mcp/server.py
@@ -1,5 +1,8 @@
+import asyncio
 import json
+import math
 import os
+import time
 from typing import Any
 
 import httpx
@@ -10,6 +13,17 @@ BASE_URL = f"http://localhost:{MINECRAFT_PORT}"
 
 mcp = FastMCP("minecraft-bridge")
 
+# ---------------------------------------------------------------------------
+# Build-session state
+# ---------------------------------------------------------------------------
+
+_build_session_active = False
+_build_session_lock = asyncio.Lock()
+_last_build_time: float = 0.0
+_BUILD_SESSION_TIMEOUT = 3.0  # seconds of inactivity before session ends
+_build_session_origin: tuple[float, float, float] | None = None
+_watcher_task: asyncio.Task | None = None
+
 
 async def _request(method: str, path: str, **kwargs) -> Any:
     """Make an HTTP request to the Minecraft mod server."""
@@ -35,6 +49,98 @@ def _fmt(data: Any) -> str:
     return json.dumps(data, indent=2)
 
 
+# ---------------------------------------------------------------------------
+# Build-session helpers (internal, not exposed as tools)
+# ---------------------------------------------------------------------------
+
+
+async def _set_bot_state(state: str) -> None:
+    await _request("POST", "/set_state", json={"state": state})
+
+
+async def _teleport_bot(x: float, y: float, z: float) -> None:
+    await _request("POST", "/teleport", json={"x": x, "y": y, "z": z})
+
+
+async def _look_at_pos(x: float, y: float, z: float) -> None:
+    await _request("POST", "/look_at", json={"x": x, "y": y, "z": z})
+
+
+async def _get_bot_position() -> tuple[float, float, float] | None:
+    data = await _request("GET", "/status")
+    if isinstance(data, dict) and "position" in data:
+        p = data["position"]
+        return (p["x"], p["y"], p["z"])
+    return None
+
+
+def _compute_viewing_position(
+    build_x: float, build_y: float, build_z: float,
+    bot_x: float, bot_y: float, bot_z: float,
+) -> tuple[float, float, float]:
+    """Compute a spot 5 blocks from the build, on the side the bot is on."""
+    dx = bot_x - build_x
+    dz = bot_z - build_z
+    dist = math.hypot(dx, dz)
+    if dist < 0.01:
+        dx, dz = 1.0, 0.0
+        dist = 1.0
+    scale = 5.0 / dist
+    return (build_x + dx * scale, build_y, build_z + dz * scale)
+
+
+async def _ensure_build_session(x: float, y: float, z: float) -> None:
+    """Start or continue a build session, managing state/teleport/look."""
+    global _build_session_active, _last_build_time, _build_session_origin
+    global _watcher_task
+
+    async with _build_session_lock:
+        _last_build_time = time.monotonic()
+
+        if _build_session_active:
+            # Session already running — just look at the new target
+            _build_session_origin = (x, y, z)
+            await _look_at_pos(x, y, z)
+            return
+
+        # --- Start a new session ---
+        _build_session_active = True
+        _build_session_origin = (x, y, z)
+
+        await _set_bot_state("building")
+
+        pos = await _get_bot_position()
+        if pos is not None:
+            bx, by, bz = pos
+            dist = math.sqrt((bx - x) ** 2 + (by - y) ** 2 + (bz - z) ** 2)
+            if dist > 16:
+                vx, vy, vz = _compute_viewing_position(x, y, z, bx, by, bz)
+                await _teleport_bot(vx, vy, vz)
+
+        await _look_at_pos(x, y, z)
+
+        # Start the watcher if not already running
+        if _watcher_task is None or _watcher_task.done():
+            _watcher_task = asyncio.create_task(_build_session_watcher())
+
+
+async def _build_session_watcher() -> None:
+    """Background task that ends the build session after inactivity."""
+    global _build_session_active, _build_session_origin
+
+    while True:
+        await asyncio.sleep(1.0)
+        async with _build_session_lock:
+            if not _build_session_active:
+                return
+            elapsed = time.monotonic() - _last_build_time
+            if elapsed >= _BUILD_SESSION_TIMEOUT:
+                await _set_bot_state("idle")
+                _build_session_active = False
+                _build_session_origin = None
+                return
+
+
 # ---------------------------------------------------------------------------
 # Observation tools (GET)
 # ---------------------------------------------------------------------------
@@ -106,7 +212,8 @@ async def get_weather() -> str:
 
 @mcp.tool()
 async def move_to(x: float, y: float, z: float) -> str:
-    """Move the bot to the given coordinates by pathfinding. Returns distance moved."""
+    """Move the bot to the given coordinates by pathfinding. Returns distance moved.
+    Use this to walk up to players or move closer to inspect builds."""
     return _fmt(await _request("POST", "/move_to", json={"x": x, "y": y, "z": z}))
 
 
@@ -119,6 +226,7 @@ async def teleport(x: float, y: float, z: float) -> str:
 @mcp.tool()
 async def place_block(x: int, y: int, z: int, block_type: str) -> str:
     """Place a block at the given coordinates. block_type is a Minecraft block ID like 'stone' or 'oak_planks'."""
+    await _ensure_build_session(x, y, z)
     return _fmt(await _request("POST", "/place_block", json={
         "x": x, "y": y, "z": z, "type": block_type,
     }))
@@ -127,12 +235,18 @@ async def place_block(x: int, y: int, z: int, block_type: str) -> str:
 @mcp.tool()
 async def place_blocks(blocks: list[dict]) -> str:
     """Place multiple blocks at once. Each entry is {x, y, z, type}. Max 10,000 blocks per call."""
+    if blocks:
+        cx = sum(b.get("x", 0) for b in blocks) / len(blocks)
+        cy = sum(b.get("y", 0) for b in blocks) / len(blocks)
+        cz = sum(b.get("z", 0) for b in blocks) / len(blocks)
+        await _ensure_build_session(cx, cy, cz)
     return _fmt(await _request("POST", "/place_blocks", json={"blocks": blocks}))
 
 
 @mcp.tool()
 async def fill(x1: int, y1: int, z1: int, x2: int, y2: int, z2: int, block_type: str) -> str:
     """Fill a bounding box with a single block type. Max volume 32x32x32."""
+    await _ensure_build_session((x1 + x2) / 2, (y1 + y2) / 2, (z1 + z2) / 2)
     return _fmt(await _request("POST", "/fill", json={
         "x1": x1, "y1": y1, "z1": z1,
         "x2": x2, "y2": y2, "z2": z2,
@@ -143,12 +257,14 @@ async def fill(x1: int, y1: int, z1: int, x2: int, y2: int, z2: int, block_type:
 @mcp.tool()
 async def break_block(x: int, y: int, z: int) -> str:
     """Break (destroy) the block at the given coordinates."""
+    await _ensure_build_session(x, y, z)
     return _fmt(await _request("POST", "/break_block", json={"x": x, "y": y, "z": z}))
 
 
 @mcp.tool()
 async def clear_area(x1: int, y1: int, z1: int, x2: int, y2: int, z2: int) -> str:
     """Clear all blocks in a bounding box (replace with air). Max volume 64x64x64."""
+    await _ensure_build_session((x1 + x2) / 2, (y1 + y2) / 2, (z1 + z2) / 2)
     return _fmt(await _request("POST", "/clear_area", json={
         "x1": x1, "y1": y1, "z1": z1,
         "x2": x2, "y2": y2, "z2": z2,
@@ -176,6 +292,7 @@ async def place_structure(
 
     Max 64 blocks in any dimension.
     """
+    await _ensure_build_session(origin_x, origin_y, origin_z)
     return _fmt(await _request("POST", "/place_structure", json={
         "origin": {"x": origin_x, "y": origin_y, "z": origin_z},
         "palette": palette,
@@ -199,6 +316,7 @@ async def save_schematic(name: str, x1: int, y1: int, z1: int, x2: int, y2: int,
 async def load_schematic(name: str, x: int, y: int, z: int) -> str:
     """Load a previously saved schematic and place it at the given origin coordinates.
     Name may only contain letters, numbers, underscore, and hyphen."""
+    await _ensure_build_session(x, y, z)
     return _fmt(await _request("POST", "/load_schematic", json={
         "name": name, "x": x, "y": y, "z": z,
     }, timeout=30.0))
@@ -206,7 +324,8 @@ async def load_schematic(name: str, x: int, y: int, z: int) -> str:
 
 @mcp.tool()
 async def set_state(state: str) -> str:
-    """Set the bot's visual state. Valid states: idle, thinking, building, moving."""
+    """Set the bot's visual state. Valid states: idle, thinking, building, moving.
+    Note: building state is auto-managed when using build tools. Use this manually for thinking or moving."""
     return _fmt(await _request("POST", "/set_state", json={"state": state}))
 
 
@@ -218,7 +337,9 @@ async def look_at(x: float, y: float, z: float) -> str:
 
 @mcp.tool()
 async def chat(message: str) -> str:
-    """Send a chat message in-game as the bot."""
+    """Send a chat message in-game as the bot.
+    Use this to narrate what you're doing, react to builds, or respond to players.
+    Keep messages short and in-character."""
     return _fmt(await _request("POST", "/chat", json={"message": message}))