Python: Fixed Anthropic and GitHub Copilot samples

[dmytrostruk]

Motivation and Context

• Fixed BaseAgent.create_session() to forward service_session_id parameter, enabling session resumption in ClaudeAgent and GitHubCopilotAgent samples
• Fixed custom agent sample: replaced invalid Role.ASSISTANT enum usage with string literal "assistant" and fixed mismatched session state key
• Simplified Anthropic skills sample for faster execution (fewer slides, smaller token budgets)
• Updated Anthropic shell sample to list .md files instead of .py files for more meaningful output
• Improved Anthropic client: added MCP tool call/result handling, signature support for thinking blocks, signature_delta parsing, and name parameter for hosted tools

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the Contribution Guidelines
• All unit tests pass, and I have added new tests where possible
• Is this a breaking change? If yes, add "[BREAKING]" prefix to the title of the PR.

[markwallace-microsoft]

Python Test Coverage Report •

File	Stmts	Miss	Cover	Missing
packages/anthropic/agent_framework_anthropic
_chat_client.py	387	36	90%	458, 545, 547, 690–691, 754, 775–776, 819–821, 823, 836–837, 844–846, 850–852, 856–859, 972, 982, 1016, 1038, 1159, 1186–1187, 1204, 1217, 1230, 1255–1256
TOTAL	21171	3326	84%

Python Unit Test Overview

Tests	Skipped	Failures	Errors	Time
4170	239 💤	0 ❌	0 🔥	1m 14s ⏱️

[Copilot]

Pull request overview

This PR fixes several issues in Python samples and improves Anthropic client functionality to enhance session management, correct API usage, and add support for new Anthropic API features.

Changes:

• Fixed BaseAgent.create_session() to forward service_session_id parameter, enabling proper session resumption in ClaudeAgent and GitHubCopilotAgent samples
• Corrected custom agent sample to use string literal "assistant" instead of invalid Role.ASSISTANT enum usage and fixed session state key to use InMemoryHistoryProvider.DEFAULT_SOURCE_ID
• Enhanced Anthropic client with MCP tool call/result message preparation, signature support for thinking blocks, and name parameter for hosted tools

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
python/packages/core/agent_framework/_agents.py	Added service_session_id parameter forwarding in BaseAgent.create_session() to enable session resumption
python/samples/02-agents/providers/custom/custom_agent.py	Fixed invalid Role.ASSISTANT usage to "assistant" string and corrected session state key to use InMemoryHistoryProvider.DEFAULT_SOURCE_ID
python/samples/02-agents/providers/anthropic/anthropic_skills.py	Reduced token budgets and slide count for faster sample execution
python/samples/02-agents/providers/anthropic/anthropic_claude_with_shell.py	Changed query to list .md files instead of .py files for more meaningful output
python/samples/02-agents/providers/anthropic/anthropic_advanced.py	Added null check for content.text before printing reasoning to handle signature-only deltas
python/packages/anthropic/agent_framework_anthropic/_chat_client.py	Added MCP tool call/result preparation, signature support for thinking blocks, name parameter for hosted tools, and improved streaming delta handling
python/packages/anthropic/tests/test_anthropic_client.py	Added tests for signature handling in thinking blocks, signature_delta parsing, and name parameter in hosted tools
python/packages/core/agent_framework/_types.py	Formatting change to simplify tools type annotation
python/samples/04-hosting/azure_functions/12_workflow_hitl/function_app.py	Reordered imports alphabetically