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update browser-use agent in alias use base64 data for image context

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update browser-use agent in alias use base64 data for image context
This commit is contained in:
Weirui Kuang
2025-11-04 17:47:53 +08:00
committed by GitHub
parent dde19f08f3 ad8ba0f7a9
commit 2164371e64
3 changed files with 38 additions and 81 deletions
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3
.gitignore vendored
View File

@@ -61,3 +61,6 @@ uv.lock
# Logs # Logs
logs/ logs/
*.log *.log
# Agent-generated files
**sessions_mount_dir/

3
alias/.gitignore vendored
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@@ -7,12 +7,9 @@ __pycache__/
# Logs # Logs
logs/ logs/
src/alias/agent/agents/log/ src/alias/agent/agents/log/
sessions_mount_dir/
# Python # Python
*.py[cod] *.py[cod]
*$py.class *$py.class
# Package # Package
alias.egg-info/ alias.egg-info/

113
alias/src/alias/agent/agents/_browser_agent.py
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@@ -11,8 +11,6 @@ import json
from typing import Type, Optional, Any from typing import Type, Optional, Any
import asyncio import asyncio
import copy import copy
import base64
import shutil
from loguru import logger from loguru import logger
from pydantic import BaseModel from pydantic import BaseModel
@@ -24,6 +22,7 @@ from agentscope.message import (
TextBlock, TextBlock,
ToolResultBlock, ToolResultBlock,
ImageBlock, ImageBlock,
Base64Source,
) )
from agentscope.model import ChatModelBase from agentscope.model import ChatModelBase
from agentscope.tool import ( from agentscope.tool import (
@@ -194,22 +193,6 @@ class BrowserAgent(AliasAgentBase):
self.toolkit.register_tool_function(self.browser_subtask_manager) self.toolkit.register_tool_function(self.browser_subtask_manager)
self.toolkit.register_tool_function(self.image_understanding) self.toolkit.register_tool_function(self.image_understanding)
if (
self.model.model_name.startswith("qvq")
or "-vl" in self.model.model_name
or "4o" in self.model.model_name
or "gpt-5" in self.model.model_name
):
# If the model supports multimodal input,
# prepare a directory for screenshots
screenshot_dir = os.path.join(
"./logs/screenshots/",
"tmp" + "_browser_agent",
)
if os.path.exists(screenshot_dir):
shutil.rmtree(screenshot_dir)
os.makedirs(screenshot_dir, exist_ok=True)
self.screenshot_dir = screenshot_dir
self.no_screenshot_tool_list = [ self.no_screenshot_tool_list = [
tool tool
for tool in self.toolkit.get_json_schemas() for tool in self.toolkit.get_json_schemas()
@@ -243,7 +226,7 @@ class BrowserAgent(AliasAgentBase):
if isinstance(msg, list) if isinstance(msg, list)
else "" else ""
) )
if self.start_url and not self._has_initial_navigated: if self.start_url and not self._has_initial_navigated:
await self._navigate_to_start_url() await self._navigate_to_start_url()
self._has_initial_navigated = True self._has_initial_navigated = True
@@ -264,7 +247,6 @@ class BrowserAgent(AliasAgentBase):
await self._summarize_mem() await self._summarize_mem()
msg_reasoning = await self._pure_reasoning() msg_reasoning = await self._pure_reasoning()
tool_calls = msg_reasoning.get_content_blocks("tool_use") tool_calls = msg_reasoning.get_content_blocks("tool_use")
if tool_calls and tool_calls[0]["name"] == "browser_snapshot": if tool_calls and tool_calls[0]["name"] == "browser_snapshot":
msg_reasoning = await self._reasoning_with_observation() msg_reasoning = await self._reasoning_with_observation()
@@ -299,7 +281,7 @@ class BrowserAgent(AliasAgentBase):
async def _pure_reasoning( async def _pure_reasoning(
self, self,
): ) -> Msg:
msg = Msg( msg = Msg(
"user", "user",
content=self.pure_reasoning_prompt.format( content=self.pure_reasoning_prompt.format(
@@ -329,7 +311,7 @@ class BrowserAgent(AliasAgentBase):
msg = Msg(self.name, [], "assistant") msg = Msg(self.name, [], "assistant")
async for content_chunk in res: async for content_chunk in res:
msg.content = content_chunk.content msg.content = content_chunk.content
await self.print(msg, False) await self.print(msg)
else: else:
msg = Msg(self.name, list(res.content), "assistant") msg = Msg(self.name, list(res.content), "assistant")
await self.print(msg) await self.print(msg)
@@ -349,12 +331,6 @@ class BrowserAgent(AliasAgentBase):
# Post-process for user interruption # Post-process for user interruption
if interrupted_by_user and msg: if interrupted_by_user and msg:
# Fake tool results
tool_use_blocks: list = (
msg.get_content_blocks( # pylint: disable=E1133
"tool_use",
)
)
for tool_call in tool_use_blocks: # pylint: disable=E1133 for tool_call in tool_use_blocks: # pylint: disable=E1133
msg_res = Msg( msg_res = Msg(
"system", "system",
@@ -371,7 +347,7 @@ class BrowserAgent(AliasAgentBase):
) )
await self.memory.add(msg_res) await self.memory.add(msg_res)
await self.print(msg_res, True) await self.print(msg_res)
async def _reasoning_with_observation( async def _reasoning_with_observation(
self, self,
@@ -389,7 +365,6 @@ class BrowserAgent(AliasAgentBase):
for _ in self.snapshot_in_chunk: for _ in self.snapshot_in_chunk:
observe_msg = await self._build_observation() observe_msg = await self._build_observation()
prompt = await self.formatter.format( prompt = await self.formatter.format(
msgs=[ msgs=[
Msg("system", self.sys_prompt, "system"), Msg("system", self.sys_prompt, "system"),
@@ -448,7 +423,7 @@ class BrowserAgent(AliasAgentBase):
) )
await self.memory.add(msg_res) await self.memory.add(msg_res)
await self.print(msg_res, True) await self.print(msg_res)
if not self.chunk_continue_status: if not self.chunk_continue_status:
break break
@@ -467,8 +442,7 @@ class BrowserAgent(AliasAgentBase):
self, self,
) -> Msg: ) -> Msg:
"""Get a snapshot in text before reasoning""" """Get a snapshot in text before reasoning"""
image_data: Optional[str] = None
image_path: Optional[str] = None
if ( if (
self.model.model_name.startswith("qvq") self.model.model_name.startswith("qvq")
or "-vl" in self.model.model_name or "-vl" in self.model.model_name
@@ -476,17 +450,10 @@ class BrowserAgent(AliasAgentBase):
or "gpt-5" in self.model.model_name or "gpt-5" in self.model.model_name
): ):
# If the model supports multimodal input, take a screenshot # If the model supports multimodal input, take a screenshot
# and pass it to the observation message # and pass it to the observation message as base64
img_path = os.path.join( image_data = await self._get_screenshot()
self.screenshot_dir,
f"screenshot_{self.iter_n}.png",
)
# if the img_path already exists,
# do not need to take a screenshot again
if not os.path.exists(img_path):
image_path = await self._get_screenshot(img_path)
observe_msg = self.observe_by_chunk(image_path) observe_msg = self.observe_by_chunk(image_data)
return observe_msg return observe_msg
async def _update_chunk_observation_status( async def _update_chunk_observation_status(
@@ -550,7 +517,6 @@ class BrowserAgent(AliasAgentBase):
Return a message to the user if the `_finish_function` is Return a message to the user if the `_finish_function` is
called, otherwise return `None`. called, otherwise return `None`.
""" """
tool_res_msg = Msg( tool_res_msg = Msg(
"system", "system",
[ [
@@ -575,6 +541,7 @@ class BrowserAgent(AliasAgentBase):
"output" "output"
] = chunk.content ] = chunk.content
# Return message if generate_response is called successfully # Return message if generate_response is called successfully
if tool_call[ if tool_call[
"name" "name"
] == self.finish_function_name and chunk.metadata.get( ] == self.finish_function_name and chunk.metadata.get(
@@ -601,7 +568,8 @@ class BrowserAgent(AliasAgentBase):
await self.memory.delete(mem_len - 1) await self.memory.delete(mem_len - 1)
else: else:
await self.memory.add(tool_res_msg) await self.memory.add(tool_res_msg)
await self.print(tool_res_msg, False) if tool_call["name"] != self.finish_function_name:
await self.print(tool_res_msg)
def _clean_tool_excution_content( def _clean_tool_excution_content(
self, self,
@@ -651,11 +619,11 @@ class BrowserAgent(AliasAgentBase):
async for content_chunk in res: async for content_chunk in res:
decompose_text = content_chunk.content[0]["text"] decompose_text = content_chunk.content[0]["text"]
print_msg.content = content_chunk.content print_msg.content = content_chunk.content
await self.print(print_msg, last=False) await self.print(print_msg, False)
else: else:
decompose_text = res.content[0]["text"] decompose_text = res.content[0]["text"]
print_msg.content = [TextBlock(type="text", text=decompose_text)] print_msg.content = [TextBlock(type="text", text=decompose_text)]
await self.print(print_msg, last=True) await self.print(print_msg, True)
# Use path relative to this file for robustness # Use path relative to this file for robustness
reflection_prompt_path = os.path.join( reflection_prompt_path = os.path.join(
@@ -818,7 +786,6 @@ class BrowserAgent(AliasAgentBase):
snapshot_in_chunk = self._split_snapshot_by_chunk( snapshot_in_chunk = self._split_snapshot_by_chunk(
snapshot_str, snapshot_str,
) )
return snapshot_in_chunk return snapshot_in_chunk
async def _memory_summarizing(self) -> None: async def _memory_summarizing(self) -> None:
@@ -902,11 +869,10 @@ class BrowserAgent(AliasAgentBase):
for msg in summarized_memory: for msg in summarized_memory:
await self.memory.add(msg) await self.memory.add(msg)
async def _get_screenshot(self, img_path: str = "") -> Optional[str]: async def _get_screenshot(self) -> Optional[str]:
""" """
Optionally take a screenshot of the current web page Optionally take a screenshot of the current web page for multimodal prompts.
for use in multimodal prompts. Returns base64-encoded PNG data if available, else None.
Returns the path to the image if available, else None.
""" """
try: try:
# Prepare tool call for screenshot # Prepare tool call for screenshot
@@ -920,7 +886,7 @@ class BrowserAgent(AliasAgentBase):
screenshot_response = await self.toolkit.call_tool_function( screenshot_response = await self.toolkit.call_tool_function(
tool_call, tool_call,
) )
# Extract image path from response # Extract image base64 from response
async for chunk in screenshot_response: async for chunk in screenshot_response:
if ( if (
chunk.content chunk.content
@@ -928,17 +894,12 @@ class BrowserAgent(AliasAgentBase):
and "data" in chunk.content[1] and "data" in chunk.content[1]
): ):
image_data = chunk.content[1]["data"] image_data = chunk.content[1]["data"]
image_data = base64.b64decode(image_data)
with open(img_path, "wb") as fi:
fi.write(image_data)
returned_img_path = img_path
# Exit loop on success
else: else:
returned_img_path = None image_data = None
except Exception: except Exception:
returned_img_path = None image_data = None
return returned_img_path return image_data
@staticmethod @staticmethod
def _filter_execution_text( def _filter_execution_text(
@@ -993,7 +954,7 @@ class BrowserAgent(AliasAgentBase):
for i in range(0, len(snapshot_str), max_length) for i in range(0, len(snapshot_str), max_length)
] ]
def observe_by_chunk(self, image_path: str | None = "") -> Msg: def observe_by_chunk(self, image_data: str | None = "") -> Msg:
"""Create an observation message for chunk-based reasoning. """Create an observation message for chunk-based reasoning.
This method formats the current chunk of the webpage snapshot with This method formats the current chunk of the webpage snapshot with
@@ -1024,13 +985,14 @@ class BrowserAgent(AliasAgentBase):
or "4o" in self.model.model_name or "4o" in self.model.model_name
or "gpt-5" in self.model.model_name or "gpt-5" in self.model.model_name
): ):
if image_path: if image_data:
image_block = ImageBlock( image_block = ImageBlock(
type="image", type="image",
source={ source=Base64Source(
"type": "url", type="base64",
"url": image_path, media_type="image/png",
}, data=image_data,
),
) )
content.append(image_block) content.append(image_block)
@@ -1383,20 +1345,15 @@ class BrowserAgent(AliasAgentBase):
), ),
] ]
# Attach screenshot if available # Attach screenshot if available
if image_data: if image_data:
image_data = base64.b64decode(image_data)
img_path = os.path.join(
self.screenshot_dir,
f"screenshot_image_understanding_{self.iter_n}.png",
)
with open(img_path, "wb") as fi:
fi.write(image_data)
image_block = ImageBlock( image_block = ImageBlock(
type="image", type="image",
source={ source=Base64Source(
"type": "url", type="base64",
"url": img_path, media_type="image/png",
}, data=image_data,
),
) )
content_blocks.append(image_block) content_blocks.append(image_block)