fix: resolve all CI failures — format, lint, mypy, and review comments

- Format: auto-reformat agent_tui.py, benchmark.py, coworker_tools.py via ruff
- Lint: 0 remaining errors after format pass
- Mypy: fix _NullPrinter to subclass Printer for type compatibility in
  executor.py, planning.py, and skill_builder.py; add isinstance(r, Message)
  guards in spawn_tools.py; annotate return types and fix dict type params
  and MCPToolResolver logger type in new_agent.py; add missing printer args
  to get_llm_response calls
- cli.py: fix _read_config to use sentinel so falsy values (0, false) are
  returned correctly instead of being treated as missing keys
- create_agent.py: replace regex-based JSONC comment stripper with a
  token-aware parser that preserves // inside quoted strings (e.g. URLs)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/cli/src/crewai_cli/agent_tui.py

@@ -533,8 +533,13 @@ class AgentTUI(App[None]):
                         yield Static("AGENTS", classes="sidebar-label")
                         yield OptionList(id="agent-list")
                     with TabPane("Memory", id="tab-memory"):
-                        yield Static("Click below to open the memory browser.", id="memory-scope-label")
-                        yield Button("Open Memory Browser", id="btn-memory", variant="default")
+                        yield Static(
+                            "Click below to open the memory browser.",
+                            id="memory-scope-label",
+                        )
+                        yield Button(
+                            "Open Memory Browser", id="btn-memory", variant="default"
+                        )
             with Vertical(id="chat-area"):
                 yield VerticalScroll(id="chat-scroll")
                 with Horizontal(id="input-row"):
@@ -1617,6 +1622,7 @@ class AgentTUI(App[None]):
                 callback=self._on_room_created,
             )
             return
+
     # ── Room creation ──
 
     def _on_room_created(self, result: dict[str, Any] | None) -> None:

lib/cli/src/crewai_cli/benchmark.py

@@ -111,7 +111,6 @@ def load_benchmark_cases(path: str | Path) -> LoadedCases:
     return LoadedCases(cases, threshold)
 
 
-
 def _check_expected(expected: str, actual: str) -> tuple[bool, float]:
     """Check if expected output is found in actual (case-insensitive substring match).
 

lib/cli/src/crewai_cli/cli.py

@@ -604,10 +604,12 @@ def _read_config(*keys: str) -> Any:
     """Read a nested value from config.json (JSONC-safe).
 
     Example: _read_config("test", "threshold") reads config["test"]["threshold"].
+    Returns None only when the key is missing, not when the value is falsy.
     """
     import json
     from pathlib import Path
 
+    _MISSING = object()
     config_path = Path("config.json")
     if not config_path.exists():
         return None
@@ -618,8 +620,8 @@ def _read_config(*keys: str) -> Any:
         for k in keys:
             if not isinstance(data, dict):
                 return None
-            data = data.get(k)
-            if data is None:
+            data = data.get(k, _MISSING)
+            if data is _MISSING:
                 return None
         return data
     except Exception:

lib/cli/src/crewai_cli/create_agent.py

@@ -812,10 +812,30 @@ def _prompt_agent_name() -> str:
         )
 
 
+_JSONC_TOKEN_RE = re.compile(
+    r'"(?:[^"\\]|\\.)*"'  # double-quoted string
+    r"|'(?:[^'\\]|\\.)*'"  # single-quoted string (not standard JSON, but safe)
+    r"|/\*.*?\*/"  # /* block comment */
+    r"|//[^\n]*"  # // line comment
+    r"|.",  # any other character
+    re.DOTALL,
+)
+
+
 def _strip_jsonc(text: str) -> str:
-    """Strip // and /* */ comments from JSONC text, then fix trailing commas."""
-    result = re.sub(r"(?<!:)//.*?$", "", text, flags=re.MULTILINE)
-    result = re.sub(r"/\*.*?\*/", "", result, flags=re.DOTALL)
+    """Strip // and /* */ comments from JSONC text, then fix trailing commas.
+
+    Only strips comments that appear outside of quoted strings, so double
+    slashes inside string values (e.g. URLs) are preserved correctly.
+    """
+
+    def _replacer(match: re.Match[str]) -> str:
+        token = match.group(0)
+        if token.startswith(("//", "/*")):
+            return ""
+        return token
+
+    result = _JSONC_TOKEN_RE.sub(_replacer, text)
     result = re.sub(r",\s*([}\]])", r"\1", result)
     return result