Comment by NewsaHackO

>And your assumption is wrong on another level. The Agent SDK specifically exists so that you can write your own harness and give it custom tools - that's its entire purpose. It's even documented in their custom tools guide [1].

Yea, you don't seem to even understand what you are writing. This in no way contradicts any statement I or Anthopic has said.

>Neither tab says anything remotely like "if a third-party app prompts the Agent SDK and uses the output for tool calls, that's not allowed." You entirely fabricated this from the comparisons.

From: https://platform.claude.com/docs/en/agent-sdk/overview#agent...

>The Anthropic Client SDK gives you direct API access: you send prompts and implement tool execution yourself. The Agent SDK gives you Claude with built-in tool execution.

>With the Client SDK, you implement a tool loop. With the Agent SDK, Claude handles it:

Python

  # Client SDK: You implement the tool loop
  response = client.messages.create(...)
  while response.stop_reason == "tool_use":
      result = your_tool_executor(response.tool_use)
      response = client.messages.create(tool_result=result, \*params)

  # Agent SDK: Claude handles tools autonomously
  async for message in query(prompt="Fix the bug in auth.py"):
      print(message)

At this point, it's clear that you either have questionable reading comprehension skills, are being willfully ignorant, or are arguing in bad faith because it even says that tool calls outside of the Agent SDK harness has to use the Client SDK as the comments to the code used in the examples.