v0.1.48

Bug Fixes

• Fine-grained tool streaming: Fixed include_partial_messages=True not delivering input_json_delta events by enabling the CLAUDE_CODE_ENABLE_FINE_GRAINED_TOOL_STREAMING environment variable in the subprocess. This regression affected versions 0.1.36 through 0.1.47 for users without the server-side feature flag (#644)

Internal/Other Changes

• Updated bundled Claude CLI to version 2.1.71

---

PyPI: https://pypi.org/project/claude-agent-sdk/0.1.48/

pip install claude-agent-sdk==0.1.48

v0.1.47

Internal/Other Changes

• Updated bundled Claude CLI to version 2.1.70

---

PyPI: https://pypi.org/project/claude-agent-sdk/0.1.47/

pip install claude-agent-sdk==0.1.47

v0.1.46

New Features

• Session history functions: Added list_sessions() and get_session_messages() top-level functions for retrieving past session data (#622)
• MCP control methods: Added add_mcp_server(), remove_mcp_server(), and typed McpServerStatus for runtime MCP server management (#620)
• Typed task messages: Added TaskStarted, TaskProgress, and TaskNotification message subclasses for better type safety when handling task-related events (#621)
• ResultMessage stop_reason: Added stop_reason field to ResultMessage for inspecting why a conversation turn ended (#619)
• Hook input enhancements: Added agent_id and agent_type fields to tool-lifecycle hook inputs (PreToolUseHookInput, PostToolUseHookInput, PostToolUseFailureHookInput) (#628)

Bug Fixes

• String prompt MCP initialization: Fixed an issue where passing a string prompt would close stdin before MCP server initialization completed, causing MCP servers to fail to register (#630)

Internal/Other Changes

• Updated bundled Claude CLI to version 2.1.69

---

PyPI: https://pypi.org/project/claude-agent-sdk/0.1.46/

pip install claude-agent-sdk==0.1.46

v0.1.45

Internal/Other Changes

• Updated bundled Claude CLI to version 2.1.63

---

PyPI: https://pypi.org/project/claude-agent-sdk/0.1.45/

pip install claude-agent-sdk==0.1.45

v0.1.44

Internal/Other Changes

• Updated bundled Claude CLI to version 2.1.59

---

PyPI: https://pypi.org/project/claude-agent-sdk/0.1.44/

pip install claude-agent-sdk==0.1.44

v0.1.43

Internal/Other Changes

• Updated bundled Claude CLI to version 2.1.56

---

PyPI: https://pypi.org/project/claude-agent-sdk/0.1.43/

pip install claude-agent-sdk==0.1.43

v0.1.42

Internal/Other Changes

• Updated bundled Claude CLI to version 2.1.55

---

PyPI: https://pypi.org/project/claude-agent-sdk/0.1.42/

pip install claude-agent-sdk==0.1.42

v0.1.41

Internal/Other Changes

• Updated bundled Claude CLI to version 2.1.52

---

PyPI: https://pypi.org/project/claude-agent-sdk/0.1.41/

pip install claude-agent-sdk==0.1.41

v0.1.40

Bug Fixes

• Unknown message type handling: Fixed an issue where unrecognized CLI message types (e.g., rate_limit_event) would crash the session by raising MessageParseError. Unknown message types are now silently skipped, making the SDK forward-compatible with future CLI message types (#598)

Internal/Other Changes

• Updated bundled Claude CLI to version 2.1.51

---

PyPI: https://pypi.org/project/claude-agent-sdk/0.1.40/

pip install claude-agent-sdk==0.1.40

v0.1.39

Internal/Other Changes

• Updated bundled Claude CLI to version 2.1.49

---

PyPI: https://pypi.org/project/claude-agent-sdk/0.1.39/

pip install claude-agent-sdk==0.1.39