ClaudeCodeModel does not support resume and continue_conversation options

[drillan]

Summary

ClaudeCodeModel class does not support resume and continue_conversation options, which are available in ClaudeAgentOptions from the Claude Agent SDK. This prevents users from resuming sessions using session_id.

Current Behavior

• ClaudeCodeModel constructor does not accept resume or continue_conversation parameters
• _extract_model_settings() does not extract these settings from model_settings
• _build_agent_options() does not pass these options to ClaudeAgentOptions
• Each query is treated as a new independent session

Expected Behavior

Users should be able to:

1. Pass resume (session_id) via model_settings to resume a previous session
2. Set continue_conversation either at instance level (constructor) or per-request (model_settings)

Proposed Solution

1. Add continue_conversation parameter to ClaudeCodeModel.__init__()
2. Add resume and continue_conversation to ClaudeCodeModelSettings TypedDict
3. Update _ExtractedSettings NamedTuple to include these fields
4. Update _extract_model_settings() to extract these settings
5. Update _build_agent_options() to pass these options to ClaudeAgentOptions
6. Update _execute_request() and stream_messages() call sites

Example Usage (after fix)

from claudecode_model import ClaudeCodeModel
from pydantic_ai.messages import ModelRequest, UserPromptPart

model = ClaudeCodeModel()
messages = [ModelRequest(parts=[UserPromptPart(content="Login to service")])]

# First request - get session_id
result = await model.request_with_metadata(messages, None, params)
session_id = result.cli_response.session_id

# Second request - resume session
messages2 = [ModelRequest(parts=[UserPromptPart(content="Get data")])]
result2 = await model.request_with_metadata(
    messages2,
    {"resume": session_id, "continue_conversation": True},
    params
)

Related

• Found during investigation of Session ID does not persist authentication for subsequent calls (works in CLI, not in SDK) #76 (which is about claude_code_sdk, not claudecode_model)