diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index fb2dba0..cb830f4 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -1,7 +1,7 @@
 # Supervaizer Changelog
 
 > **Created:** 2025-08-05
-> **Updated:** 2026-05-19
+> **Updated:** 2026-05-20
 
 All notable changes to this project will be documented in this file.
 
@@ -11,19 +11,32 @@ All notable changes to this project will be documented in this file.
 
 - Review and test feature/data-persistence
 - Complete feature/smart-install implementation
-- Fix receive_human_input
-- When AgentMethodField returns its value (in the kwargs of job_start), the value should be casted in the appropriate type :
-  - example: here the 'How many times to say hello' is supposed to be an 'int'.
   - agent_simple:job_start:74 - AGENT ExampleAgent: Received kwargs: {'action': 'start', 'fields': {'How many times to say hello': '3'}, 'context': JobContext(workspace_id='odm', job_id='01KGM75NQ76AWBAXHXERW8FKHW', started_by='alp', started_at=datetime.datetime(2026, 2, 4, 11, 39, 0, 712598, tzinfo=TzInfo(0)), mission_id='01KGG50ZMFYMHG9N5FGCACF0XA', mission_name='Operate Agent Hello World AI Agent', mission_context=None, job_instructions=JobInstructions(max_cases=None, max_duration=None, max_cost=None, stop_on_warning=False, stop_on_error=True, job_start_time=None)), 'agent_parameters': [{'name': 'SIMPLE AGENT PARAMETER', 'team_id': 2, 'description': 'Setup agent parameter in this workspace', 'is_environment': True, 'value': '123456', 'is_secret': False, 'is_required': False}, {'name': 'SIMPLE AGENT SECRET', 'team_id': 2, 'description': 'Setup agent secret in this workspace', 'is_environment': True, 'value': '123456', 'is_secret': True, 'is_required': False}]}
 
 ## [Unreleased]
 
+### Changed
+
+- **Cloud Logging structured output** — `SUPERVAIZER_LOG_FORMAT=json` now switches controller stderr logs to newline-delimited JSON with Cloud Logging-compatible `severity` plus bound fields such as access-denial `path`, `reason`, and truncated `key_preview`; local text logging remains the default.
+
+### Tests
+
+- `tests/test_common.py` — structured JSON log output for API access-denial records
+- `just test`
+
+| Status     | Count |
+| ---------- | ----- |
+| ✅ Passed  | 658   |
+| 🤔 Skipped | 0     |
+| 🔴 Failed  | 0     |
+| ⏱️ in      | 92s   |
+
 ## [1.1.0] - 2026-05-19
 
 ### Added
 
 - **Workspace agent authorization** — Studio-signed Ed25519 workspace authorization tokens on `X-Supervaize-Workspace-Authorization`; the SDK verifies JWKS-backed tokens and exposes `V2VerifiedWorkspaceContext` for handlers. Workspace and tenant slugs remain routing hints only.
-- **Workspace binding protocol** — Agents can declare optional `workspace_binding` metadata with bootstrap `workspace_binding.options`, `workspace_binding.create`, and the `workspace_binding.create` surface so Studio can bind an agent-side record before a Workspace Agent Grant exists.
+- **Workspace binding rotocol** — Agents can declare optional `workspace_binding` metadata with bootstrap `workspace_binding.options`, `workspace_binding.create`, and the `workspace_binding.create` surface so Studio can bind an agent-side record before a Workspace Agent Grant exists.
 - **Workspace authorization docs** — `docs/2026_05_WORKSPACE_AGENT_GRANTS.md` plus workspace authorization and binding bootstrap rules in `docs/2026_05_PROTOCOLS.md` and `docs/2026_05_SUPERVAIZER_v2.md`.
 
 ### Changed
diff --git a/src/supervaizer/common.py b/src/supervaizer/common.py
index 32d5b25..7aefeaa 100644
--- a/src/supervaizer/common.py
+++ b/src/supervaizer/common.py
@@ -14,9 +14,10 @@
 import base64
 import json
 import os
+import sys
 import traceback
 from collections.abc import Callable
-from typing import Any, TypeVar
+from typing import Any, TextIO, TypeVar
 
 import demjson3
 from cryptography.hazmat.primitives import hashes
@@ -28,6 +29,57 @@
 log = logger.bind(module="supervaize")
 
 T = TypeVar("T")
+STRUCTURED_LOG_FORMAT_ENV = "SUPERVAIZER_LOG_FORMAT"
+STRUCTURED_LOG_FORMAT_JSON = "json"
+_DEFAULT_LOG_FORMAT = (
+    "<green>{time:YYYY-MM-DD HH:mm:ss.SSS}</green>|"
+    "<level> {level}</level> | <level>{message}</level>"
+)
+
+
+def structured_logging_enabled() -> bool:
+    """Return whether Supervaizer should emit newline-delimited JSON logs."""
+    return (
+        os.getenv(STRUCTURED_LOG_FORMAT_ENV, "").strip().lower()
+        == STRUCTURED_LOG_FORMAT_JSON
+    )
+
+
+def configure_controller_logging(
+    log_level: str,
+    *,
+    sink: TextIO = sys.stderr,
+) -> int:
+    """Configure Supervaizer controller logs for local text or Cloud Logging JSON."""
+    log.remove()
+    if structured_logging_enabled():
+        return log.add(
+            lambda message: _write_structured_log(message.record, sink),
+            level=log_level,
+        )
+    return log.add(
+        sink,
+        colorize=True,
+        format=_DEFAULT_LOG_FORMAT,
+        level=log_level,
+    )
+
+
+def _write_structured_log(record: dict[str, Any], sink: TextIO) -> None:
+    payload: dict[str, Any] = {
+        "severity": record["level"].name,
+        "message": record["message"],
+        "timestamp": record["time"].isoformat(),
+        "logger": record["name"],
+        "module": record["module"],
+        "function": record["function"],
+        "line": record["line"],
+    }
+    for key, value in record["extra"].items():
+        target_key = key if key not in payload else f"extra_{key}"
+        payload[target_key] = value
+    sink.write(json.dumps(payload, default=str, separators=(",", ":")) + "\n")
+    sink.flush()
 
 
 def is_local_mode() -> bool:
@@ -220,13 +272,20 @@ def dict(self) -> dict[str, Any]:
 
 def log_access_denied_tailscale(ip: str, path: str, reason: str) -> None:  # <-- ADDED
     """Log a Tailscale access denial with structured fields."""
-    log.warning(f"[access:tailscale] denied ip={ip!r} path={path!r} reason={reason!r}")
+    log.bind(access_type="tailscale", ip=ip, path=path, reason=reason).warning(
+        f"[access:tailscale] denied ip={ip!r} path={path!r} reason={reason!r}"
+    )
 
 
 def log_access_denied_api(key: str | None, path: str, reason: str) -> None:  # <-- ADDED
     """Log an API-key access denial; key is truncated to avoid leaking secrets."""
-    key_preview = (key[:6] + "…") if key and len(key) > 6 else (key or "<none>")
-    log.warning(
+    key_preview = f"{key[:6]}..." if key and len(key) > 6 else (key or "<none>")
+    log.bind(
+        access_type="api",
+        key_preview=key_preview,
+        path=path,
+        reason=reason,
+    ).warning(
         f"[access:api] denied key={key_preview!r} path={path!r} reason={reason!r}"
     )
 
diff --git a/src/supervaizer/server.py b/src/supervaizer/server.py
index 37f3e36..6097eb5 100644
--- a/src/supervaizer/server.py
+++ b/src/supervaizer/server.py
@@ -11,15 +11,14 @@
 # https://mozilla.org/MPL/2.0/.
 
 import asyncio
-from hashlib import sha256
 import os
 import secrets
-import sys
 import time
 import uuid
 from collections.abc import AsyncIterator, Callable
 from contextlib import asynccontextmanager
 from datetime import datetime  # <-- REMOVED: Path (no longer needed)
+from hashlib import sha256
 from typing import Any, ClassVar, TypeVar, cast
 from urllib.parse import urlunparse
 
@@ -45,6 +44,7 @@
     ApiResult,
     ApiSuccess,
     SvBaseModel,
+    configure_controller_logging,
     decrypt_value,
     encrypt_value,
     is_local_mode,
@@ -735,13 +735,7 @@ def registration_info(self) -> dict[str, Any]:
 
     def launch(self, log_level: str | None = "INFO") -> None:
         if log_level:
-            log.remove()
-            log.add(
-                sys.stderr,
-                colorize=True,
-                format="<green>{time:YYYY-MM-DD HH:mm:ss.SSS}</green>|<level> {level}</level> | <level>{message}</level>",
-                level=log_level,
-            )
+            configure_controller_logging(log_level)
 
             # Add log handler for admin streaming if API key is enabled
             if self.api_key:
diff --git a/tests/test_common.py b/tests/test_common.py
index 7a16b94..99093e2 100644
--- a/tests/test_common.py
+++ b/tests/test_common.py
@@ -12,6 +12,7 @@
 
 
 import json
+from io import StringIO
 from typing import Any
 
 import pytest
@@ -23,8 +24,12 @@
     ApiError,
     ApiSuccess,
     SvBaseModel,
+    STRUCTURED_LOG_FORMAT_ENV,
+    configure_controller_logging,
     decrypt_value,
     encrypt_value,
+    log,
+    log_access_denied_api,
     singleton,
 )
 
@@ -203,6 +208,29 @@ def __init__(self, status_code: int, response_text: str) -> None:
     assert error.log_message == "❌ error : "
 
 
+def test_configure_controller_logging_outputs_cloud_logging_json(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    """Structured logging emits JSON with Cloud Logging severity and queryable fields."""
+    monkeypatch.setenv(STRUCTURED_LOG_FORMAT_ENV, "json")
+    output = StringIO()
+    sink_id = configure_controller_logging("INFO", sink=output)
+    try:
+        log_access_denied_api("abcdef123456", "/a2a", "invalid key")
+    finally:
+        log.remove(sink_id)
+
+    payload = json.loads(output.getvalue())
+    assert payload["severity"] == "WARNING"
+    assert payload["message"] == (
+        "[access:api] denied key='abcdef...' path='/a2a' reason='invalid key'"
+    )
+    assert payload["access_type"] == "api"
+    assert payload["key_preview"] == "abcdef..."
+    assert payload["path"] == "/a2a"
+    assert payload["reason"] == "invalid key"
+
+
 def test_singleton() -> None:
     """Test singleton decorator"""