Python: Bug: AttributeError: module 'mcp.types' has no attribute 'ToolUseContent' after PR #2597 #2734

PR #2597 introduced a breaking change that prevents agent-framework from importing. The code references types.ToolUseContent and types.ToolResultContent which don't exist in any released version of the mcp package.

Error

AttributeError: module 'mcp.types' has no attribute 'ToolUseContent'

Traceback:

File "/agent_framework/__init__.py", line 12, in <module>
    from ._agents import *
File "/agent_framework/_agents.py", line 18, in <module>
    from ._clients import BaseChatClient, ChatClientProtocol
File "/agent_framework/_clients.py", line 11, in <module>
    from ._mcp import MCPTool
File "/agent_framework/_mcp.py", line 134, in <module>
    | types.ToolUseContent
      ^^^^^^^^^^^^^^^^^^^^
AttributeError: module 'mcp.types' has no attribute 'ToolUseContent'

Root Cause

The issue was introduced in PR #2597 at _mcp.py:L134-L135:

def _mcp_type_to_ai_content(
    mcp_type: types.ImageContent
    | types.TextContent
    | types.AudioContent
    | types.EmbeddedResource
    | types.ResourceLink
    | types.ToolUseContent      # ❌ DOES NOT EXIST in mcp package
    | types.ToolResultContent   # ❌ DOES NOT EXIST in mcp package
    | Sequence[...],
) -> list[Contents]:

Verification

I've tested with multiple mcp package versions (1.13.0, 1.19.0, 1.23.3). None contain these attributes.

Available Tool-related types in mcp.types:

• Tool
• ToolAnnotations
• CallToolRequest
• CallToolRequestParams
• CallToolResult
• ListToolsRequest
• ListToolsResult
• ToolListChangedNotification
• ToolsCapability

Not available:

• ❌ ToolUseContent
• ❌ ToolResultContent

Reproduction

from agent_framework import ChatMessage, Role, SequentialBuilder
# Fails immediately with AttributeError

Environment

• agent-framework: 1.0.0b251204
• mcp: 1.13.0 / 1.19.0 / 1.23.3 (all fail)
• Python: 3.13
• OS: macOS

Impact

• ⚠️ Breaks all imports of agent-framework
• ⚠️ Affects DeepLearning.AI Microsoft Agent Framework course materials
• ⚠️ Students and developers cannot use the package at all

Possible Solutions

1. Remove the references to ToolUseContent and ToolResultContent if they're not needed
2. Pin mcp to a specific version that contains these types (if one exists)
3. Add these types to the mcp package first, then reference them
4. Make these types optional with proper type guards

Related

• PR: Python: Pin meta core #2597
• Introduced: Last week (commit visible in blame view)