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3193174 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 | """Stdout callback handler for pretty console output."""
from typing import Any
from uuid import UUID
from ..base import BaseCallbackHandler
__all__ = ["StdoutCallbackHandler"]
class StdoutCallbackHandler(BaseCallbackHandler):
"""
Prints events to stdout with colors and emojis.
Similar to LangChain's verbose mode.
"""
def __init__(
self,
color: bool = True,
show_prompts: bool = False,
show_outputs: bool = True,
truncate_length: int = 200,
):
self.color = color
self.show_prompts = show_prompts
self.show_outputs = show_outputs
self.truncate_length = truncate_length
self._indent = 0
def _truncate(self, text: str) -> str:
if len(text) <= self.truncate_length:
return text
return text[: self.truncate_length] + "..."
def _print(self, message: str) -> None:
_ = message # Used in subclass implementations
" " * self._indent
# === Run lifecycle ===
def on_run_start(
self,
*,
run_id: UUID,
query: str,
num_agents: int = 0,
execution_order: list[str] | None = None,
**kwargs: Any,
) -> None:
_ = (run_id, query, kwargs) # Unused but required by interface
self._print(f"🚀 Run started: {num_agents} agents")
if execution_order:
self._print(f" Order: {' → '.join(execution_order)}")
self._indent += 1
def on_run_end(
self,
*,
run_id: UUID,
output: str,
success: bool = True,
error: BaseException | None = None,
total_tokens: int = 0,
total_time_ms: float = 0.0,
executed_agents: list[str] | None = None,
**kwargs: Any,
) -> None:
_ = (run_id, output, executed_agents, kwargs) # Unused but required by interface
self._indent = max(0, self._indent - 1)
if success:
self._print(f"✅ Run completed: {total_tokens} tokens, {total_time_ms:.0f}ms")
else:
self._print(f"❌ Run failed: {error}")
# === Agent lifecycle ===
def on_agent_start(
self,
*,
run_id: UUID,
agent_id: str,
agent_name: str = "",
step_index: int = 0,
prompt: str = "",
**kwargs: Any,
) -> None:
_ = (run_id, kwargs) # Unused but required by interface
name = agent_name or agent_id
self._print(f"▶️ [{step_index}] {name} started")
if self.show_prompts and prompt:
self._print(f" Prompt: {self._truncate(prompt)}")
self._indent += 1
def on_agent_end(
self,
*,
run_id: UUID,
agent_id: str,
output: str,
agent_name: str = "",
step_index: int = 0,
tokens_used: int = 0,
duration_ms: float = 0.0,
is_final: bool = False,
**kwargs: Any,
) -> None:
_ = (run_id, kwargs) # Unused but required by interface
self._indent = max(0, self._indent - 1)
name = agent_name or agent_id
final_marker = " [FINAL]" if is_final else ""
self._print(f"✅ [{step_index}] {name} completed: {tokens_used} tokens, {duration_ms:.0f}ms{final_marker}")
if self.show_outputs and output:
self._print(f" Output: {self._truncate(output)}")
def on_agent_error(
self,
error: BaseException,
*,
run_id: UUID,
agent_id: str,
error_type: str = "",
will_retry: bool = False,
attempt: int = 0,
max_attempts: int = 0,
**kwargs: Any,
) -> None:
_ = (run_id, error_type, kwargs) # Unused but required by interface
retry_info = f" (retry {attempt}/{max_attempts})" if will_retry else ""
self._print(f"❌ {agent_id} error: {error}{retry_info}")
# === Retry ===
def on_retry(
self,
*,
run_id: UUID,
agent_id: str,
attempt: int,
max_attempts: int = 0,
delay_ms: float = 0.0,
error: str = "",
**kwargs: Any,
) -> None:
_ = (run_id, error, kwargs) # Unused but required by interface
self._print(f"🔄 {agent_id} retry {attempt}/{max_attempts} (delay: {delay_ms:.0f}ms)")
# === Token streaming ===
def on_llm_new_token(
self,
token: str,
*,
run_id: UUID,
agent_id: str,
is_first: bool = False,
is_last: bool = False,
**kwargs: Any,
) -> None:
_ = (token, run_id, agent_id, kwargs) # Unused but required by interface
if is_first:
pass
if is_last:
pass # newline
# === Planning ===
def on_plan_created(
self,
*,
run_id: UUID,
num_steps: int,
execution_order: list[str],
**kwargs: Any,
) -> None:
_ = (run_id, execution_order, kwargs) # Unused but required by interface
self._print(f"📋 Plan: {num_steps} steps")
def on_topology_changed(
self,
*,
run_id: UUID,
reason: str,
old_remaining: list[str],
new_remaining: list[str],
change_count: int = 0,
**kwargs: Any,
) -> None:
_ = (run_id, old_remaining, new_remaining, kwargs) # Unused but required by interface
self._print(f"🔄 Topology changed #{change_count}: {reason}")
# === Pruning/Fallback ===
def on_prune(
self,
*,
run_id: UUID,
agent_id: str,
reason: str,
**kwargs: Any,
) -> None:
_ = (run_id, kwargs) # Unused but required by interface
self._print(f"✂️ Pruned {agent_id}: {reason}")
def on_fallback(
self,
*,
run_id: UUID,
failed_agent_id: str,
fallback_agent_id: str,
reason: str = "",
**kwargs: Any,
) -> None:
_ = (run_id, reason, kwargs) # Unused but required by interface
self._print(f"🔀 Fallback: {failed_agent_id} → {fallback_agent_id}")
# === Parallel execution ===
def on_parallel_start(
self,
*,
run_id: UUID,
agent_ids: list[str],
group_index: int = 0,
**kwargs: Any,
) -> None:
_ = (run_id, kwargs) # Unused but required by interface
agents = ", ".join(agent_ids)
self._print(f"⚡ Parallel group {group_index}: [{agents}]")
self._indent += 1
def on_parallel_end(
self,
*,
run_id: UUID,
agent_ids: list[str],
group_index: int = 0,
successful: list[str] | None = None,
failed: list[str] | None = None,
**kwargs: Any,
) -> None:
_ = (run_id, failed, kwargs) # Unused but required by interface
self._indent = max(0, self._indent - 1)
success_count = len(successful or [])
total = len(agent_ids)
self._print(f"⚡ Parallel group {group_index} done: {success_count}/{total}")
# === Budget ===
def on_budget_warning(
self,
*,
run_id: UUID,
budget_type: str,
current: float,
limit: float,
ratio: float = 0.0,
**kwargs: Any,
) -> None:
_ = (run_id, current, limit, kwargs) # Unused but required by interface
self._print(f"⚠️ Budget warning: {budget_type} at {ratio:.0%}")
def on_budget_exceeded(
self,
*,
run_id: UUID,
budget_type: str,
current: float,
limit: float,
action_taken: str = "",
**kwargs: Any,
) -> None:
_ = (run_id, action_taken, kwargs) # Unused but required by interface
self._print(f"🛑 Budget exceeded: {budget_type} ({current:.0f}/{limit:.0f})")
# === Tool lifecycle ===
def on_tool_start(
self,
*,
run_id: UUID,
agent_id: str = "",
tool_name: str,
action: str = "",
arguments: dict[str, Any] | None = None,
**kwargs: Any,
) -> None:
_ = (run_id, agent_id, kwargs) # Unused but required by interface
args_preview = ""
if arguments:
args_str = str(arguments)
args_preview = f" ({self._truncate(args_str)})"
self._print(f"🔧 Tool {tool_name}.{action} started{args_preview}")
self._indent += 1
def on_tool_end(
self,
*,
run_id: UUID,
agent_id: str = "",
tool_name: str,
action: str = "",
success: bool = True,
output_size: int = 0,
duration_ms: float = 0.0,
result_summary: str = "",
**kwargs: Any,
) -> None:
_ = (run_id, agent_id, kwargs) # Unused but required by interface
self._indent = max(0, self._indent - 1)
icon = "✅" if success else "❌"
summary = f": {result_summary}" if result_summary else ""
self._print(f"{icon} Tool {tool_name}.{action} done ({duration_ms:.0f}ms, {output_size}b){summary}")
def on_tool_error(
self,
*,
run_id: UUID,
agent_id: str = "",
tool_name: str,
action: str = "",
error_type: str = "",
error_message: str = "",
**kwargs: Any,
) -> None:
_ = (run_id, agent_id, kwargs) # Unused but required by interface
self._print(f"❌ Tool {tool_name}.{action} error: {error_type}: {self._truncate(error_message)}")
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